25:["$","title",null,{"children":"Regl + CoordMask rebuild of PDX Map Tracer - stable, before worker tomfoolery | mheard03 | Observable"}] 49:Ta456,// This is for legibility only; it's not part of the program logic. // Layout is [ outputColor, [ inputColors ] ], where [ inputColors ] is the color of each province in the state. sampleColorReplacementMapValues = [ // South Atlantic Islands [ "xB5760C", [ "xB5760C", "x0CB556", "xB0BDDF", "xB5100C", "x3020D0", "x5E9DB3", "x9EF337" ] ], // Rio Grande do Norte [ "xB1D72A", [ "xB1D72A", "x604190", "x563E55", "xDC9F66", "xED0C0B", "x37F7DE", "xAD0128", "x5DCFF3", "x6E0A83" ] ], // Paraiba [ "xB20898", [ "xB20898", "x1A2590", "xCCF195", "xA00150", "x5F988B", "xF7C27D", "xEF30C9", "x516DE8", "x594558" ] ], // The rest of South America... 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"xE72C6E", "x2B826F", "x68945C", "xCEB8CB", "x11330B", "x405F17", "x69DFC4", "x01BCE8", "x29C483", "x15BFE8", "x0E4B34", "x9AD896", "xAF2A17", "x3D90CB", "x754421", "x96AF4C", "x776B49", "xABFA19", "x4EA25F", "x3DE3B3", "xF53054", "x4236E9", "xCFC8B9", "xFA2457", "xC7ED83", "x6EBBB7", "x93EE28", "x1E7015", "xA5E152", "x10504F", "x71D9D7", "x0F0F7E", "xB2B9BA", "x27C08F", "xA6F2B7", "x7CD432", "xE3AA75", "xB26BED", "xA18C78", "x22E97D", "xDD69F8", "x88DD4E", "x1774C8", "x9D43CF", "xE67FA7", "x4B18FB", "x25C093", "x3C8A04", "xD5C3C8", "x1DF7C9", "x04B286", "xD38892", "xC67143", "xEB9C41", "xC8BE47", "xA28D6D", "x34DF8A", "x37A4BA", "xBA3D90", "xA8A2F7", "xD247CC", "x0141D0", "xC48D73", "x3CD803", "xF9BA26", "xF2431F", "xFB873A", "x56393C", "x2C6278", "xCF7DCB", "x4A5BBF", "xF6D554", "x51D595", "xCC1C10", "x6FD2AB", "xA5B966", "x760CE7", "xB3B0D7", "xA6DF31", "x2A97C3", "xEF9BED", "x8FBAD0", "x92C628", "xF3DE48", "xBF2031", "x67F461", "x738424", "x0656BC", "x919690", "x87D837", "x5B1757", "x17D536", "x11FB67", "x9857EB", "x2FB187", "x90374C", "xC6C424", "x7929C2", "xA27083", "x0D1245", "xF66667", "xDCD39F", "x7A5DE0", "x93F111", "xD247D2", "xAF60BB", "xFD215B", "x2B9070", "x01DA65", "xE11FD3", "x0787AA", "x0A7262", "x00908F", "xDEAB1B", "x040C17", "xD86D1A", "x97E7EB", "x980045", "xA7C769", "xA199C6", "x22EC82", "xD3ACD6", "x52A4E3", "x82D74F", "xA8D34F", "x60F2BD", "x91B508", "x8AEF71", "x75C6D7", "x8EFA19", "xECCFD7", "x184722", "x5ADB44", "xDBB71B", "x3A3CE3", "x89892F", "x182380", "xE02E9A", "xBA4B7C", "xAB972A", "xCFCEB4", "x4F11D7", "xE8512C", "x50F389", "x86F093", "xE9C5E4", "x2AE17E", "xDE5BE5", "xF714FC", "xB977BC", "xD0223C", "xCD6F40", "x2A23E9", "xDD8728", "x5DDBCA", "x7E10B1", "x857B07", "x3880D4", "x2ACD4C", "x2AD465", "xD331D4", "x4D8530", "x409970", "xB9F1FF", "xFB9C08", "xB347D6", "x0F1505", "xE1B118", "x2E7F13", "x9E0077", "x758198", "x1C1B7D", "x2CDDD0", "x618E48", "xCDF95A", "x478475", "x98A3E2", "x17675E", "x265206", "x5A6439", "x6506ED", "xCA0FAC", "xF9F924", "x987D0C", "xA61CC9", "x1C92E2", "x26F90F", "xFD8937", "x42A2E2", "xFB3C67", "x0076E6", "x861B98", "x53D7A6", "xA4140F", "x25BD9D", "xFC7A98", "xA3DC23", "xF113B9", "xC9955F", "x1AADD5", "xD0336A", "xA85298", "xDF45EF", "x647BCC", "x83B7C6", "x214090", "xD10967", "x6C5723", "xE70FB1", "x1CCABD", "x5D0E06", "xC585D3", "xFF1B33", "x9B7537", "x8D8F6C", "xD8956A", "x70F4E3", "x5A4A14", "xABFB77", "x62E369", "xF88DAD", "xD4D11B", "x12B65A", "x4EB3AA", "x976874", "xD370AE", "x0C5436", "x41EA08", "xA1AF7C", "x5AC0B3", "x6A5AAF", "x9C7C22", "x96CEB1", "xA25E6F", "x3EA80A", "x7E7888", "x1C5644", "x0934A4", "x8B778F", "xA30D13", "xBBB067", "xDFF7B7", "xC2EEA7", "x1915D6" ] ], [ "xB62AF0", [ "xB62AF0", "x91C728", "xF9125F", "xA837D2", "x36D9EF", "xC45530", "x4A16EA", "x43D729", "x237C27", "x23EFD7", "xACEB79", "x48171B", "xE14B14", "xE60BF7", "xED3292", "xFFE4C1", "x5C2AA8", "xC04090", "x45EED6", "x717A55", "x4D1CA6", "xA58C2D", "xEDAC7C", "x2EE626", "x5820C3", "x8F7DE4", "x71D3B4", "x18AF1A", "x8899C3", "xE0A9E2", "x211F43", "xE2A941", "x1F56AE", "xCEDA54", "xC53B26", "x0A49A7", "xA8E4E8", "x4370B4", "x9752DF", "x87087A", "xA9FD52", "x569250", "x41C051", "x7F0E49", "x06C624", "xEE058F", "x2994F2", "x1BE381", "x24AC59", "xC51963", "x950AF3", "x3D6A7B", "x7A431A", "x75E887", "x8653EE", "xFF4650", "x5DB7DF", "xB374FD", "x90539F", "x7CDC0B", "xB43F4F", "xB8747C", "x210144", "x5285F9", "x6FC2D0", "x0E6BAF", "x77399A", "x681E21", "xDCD7C9", "x597DD7", "xF62EBB", "x450DE4", "x6831AB", "x228F62", "xE95326", "xBB7948", "x929F4C", "x72DE57", "x49A43E", "x01FB64", "x0C14D1", "x554D04", "x0DD209", "x3FF111", "xB76ECB", "xD068EF", "x7B89C9", "x5755E4", "xDC716A", "xBD9F17", "xFDC3C4", "x9E3C4B", "x0C34F7", "x7697B7", "x8F7F6F", "xE3F904", "x1F175F", "xA92523", "x35728C", "x50FD51", "xA5AF12", "x67CDD3", "xCCF73F", "x57DC7A", "x2906D5", "xA30817", "x62493B", "x71E84F", "xA23B8A", "x20EFD3", "xD246CD", "x47D460", "x073FDE", "x2E7EBF", "x379D54", "x8976AD", "x60FF01", "xE00111", "x9FC0FE", "x446753", "x4A8664", "x20B9B2", "xE921FB", "x74AF3A", "x840034", "xF00CED", "x4CA6CC", "x46A9DE", "x6407BA", "xE2B050", "xFF5E63", "xFE1511", "x206CC6", "xD6AD0C", "x31B106", "xCC99C2", "xDDEE22", "xA2F845", "x775279", "x34C294", "xF5AEBE", "xAA5F0C", "xB9D5AE", "xF0A42C", "xC3136F", "x329800", "x64E682", "x8C4707", "xA12EB0", "x54AC8C", "x8A52D2", "x3DCCEA", "xF83090", "x9C3270", "x575E56", "x69C874", "x328B67", "x3B31BD", "x2811A6", "x94F9C8", "x705239", "xC49B34", "x3C83DF", "xD7092A", "x5A4946", "xD740E9", "x378065", "xAA63FA", "xFE9E78", "x1BCE49", "x9778E0", "x0DE918", "x48B190", "xE856C1", "x8FFEA0", "x74BC05", "xDE68CB", "xB4DB5E", "x40AB15", "x3B3011", "x4D62D6", "x2C2C20", "x702F8B", "x3A4B20", "xE08090", "x23699F", "xAFB883", "xBF2FEF", "xAE4F84", "x46E2D3", "xA11526", "xDF91C1", "x87F2F9", "x7FB6F1", "xF8A947", "x8062F4", "x47ED24", "xE18840", "x79D4B1", "xFFF6EE", "x2629FF", "xB711DF", "x01084B", "x08B908", "x95BF58", "x831427", "xE2754D", "x871D4A", "x989CB7", "xAB3298", "xB241C1", "x3D7B8F", "x196415", "x58BD7A", "x48E330", "x84E5E0", "xC46825", "x03487B", "xD122E9", "xEA0BD4", "x992895", "xBD1800", "xC5CD94", "xC599F6", "x3116DB", "xEA5BE9", "x610A61", "x333FE5", "xE73BE7", "x54CC99", "xDBEA3D", "x4216B3", "x137A16", "x328FFE", "x5A3090", "x756755", "xFF6FE1", "xEA0EB1", "xF3E4CF", "x894577", "x2CA8CA", "x8F758B", "x038CB0", "x8B5A01", "xD75909", "xE379B6", "x8F6B32", "x9DA6FA", "x73E176", "xE3CC7D", "xB2C542", "x9DD475", "x06E0E9", "xEE6521", "xF02823", "x081A73", "xA88280", "x918579", "xDBC4C9", "xD34BA0", "x682823", "xBEBFA7", "xF0A6D7", "xEECA78", "x2F2B09", "x402E72", "xBB6578", "x5A47CA", "xEA326C", "xC04151", "xD7EC39", "x47BA4D", "xBF360F", "xD9B51B", "x1A3B8F", "x6BE64A", "x54D63A", "x6FE8D5", "xADB7B9", "xA19E99", "x80FA90", "x9FA745", "x109595", "xDABCDD", "x0C80D5", "xDBADFE", "x8E80DF", "xE67742", "xFE4759", "x22964C", "xFC221C", "xB43B72", "x2F15DF", "x7CD52C", "x83B1BA", "x645927", "x2B8C6E", "xF7FD32", "x14EE0B", "x36E83E", "xE2B0B7", "x4315D5", "xE8D3C3", "xABA7B1", "x6A1760", "xE5EF82", "xE8E12A", "x2404C7", "x2F69F7", "x6C2ED1", "x3FA0FB", "x5C39FF", "xF97E89", "xC886E3", "xFCD456", "x40C090", "x47D820", "x817AFB", "xF192D6", "x4751E8", "x9AE5DE", "xA88EBF", "xEC140B", "xF3946E", "xFC29D0", "xF47364", "xCF9E9F", "xBC7468", "x8A5A62", "x6809E1", "x4C2A62", "x8BD00A", "x2A5962", "x2AF127", "xB29291", "x8F231D" ] ] ];4a:T6fa,{ const gpuLayer = createCanvasElement((gpuOutputLayer == "sampleTile") ? sampleTile : sampleTileGpuResult[gpuOutputLayer + "IO"]); gpuLayer.style.maxWidth = `min(${width}px, ${gpuLayer.width / devicePixelRatio}px)`; gpuLayer.style.border = "2px dotted #ff00ff"; const label = `**${gpuOutputLayer}** (${gpuLayer.width}x${gpuLayer.height})`; const descriptions = { sampleTile: `**\`sampleTile\`** is the bitmap sent to the GPU for processing. It's a copy of tile [${sampleTileRect.index}] of \`image\`, padded for feature detection.`, color: `**\`color\`** is \`sampleTile\` after color-mapping.`, neighbors: `**\`neighbors\`** is \`color\` after neighbor detection. The red channel of each pixel is a \`neighborEncodings\` bitmask value indicating whether this location in \`color\` had different-colored neighbors to the north, east, south, and west. \`getRingsFromGpuOutput\` will use this information to create vectors that wrap each pixel on the appropriate sides.`, coords: `**\`coords\`** is \`color\` after feature detection. The red channel of each pixel is a \`coordEncodings\` enumeration value indicating whether the northwest corner of this pixel should get special treatment when the coordinates are smoothed.` }; if (sampleTileSlicer.tileCount == 1) { descriptions.sampleTile = "**`sampleTile`** is the bitmap sent to the GPU for processing. Because tiling wasn't necessary, `sampleTile` is just a copy of \`image\`, padded for feature detection." } if (!colorReplacementMap) { descriptions.color = `**\`color\`** is \`sampleTile\` after color-mapping. No color-mapping was done because \`colorReplacementMap\` wasn't defined.` } return md`${label}
${gpuLayer} ${descriptions[gpuOutputLayer]}

`; }4b:T4aa,function getMapGeoProjection(projection, outputSize, geoBbox) { const proj = projection() const [x1, y1] = outputSize; let geoExtentObj; { const [x0, y0, x1, y1] = geoBbox; geoExtentObj = { type: "LineString", coordinates: [[x0,y0], [x0,y1], [x1,y1], [x1,y0], [x0,y0]] } } let geoCenter; { const extentWidth = geoBbox[2] - geoBbox[0]; geoCenter = d3.geoCentroid(geoExtentObj); if (extentWidth > 270 || !d3.geoContains(geoExtentObj, geoCenter)) { const sign = Math.sign(geoCenter[0]); geoCenter[0] -= sign * 180; } } if (geoBbox[2] - geoBbox[0] == 360) { proj.fitWidth(x1, geoExtentObj); } else { proj.fitWidth(x1, geoExtentObj); const scaleW = proj.scale(); proj.fitHeight(y1, geoExtentObj); const scaleH = proj.scale(); proj.fitSize([x1, y1], geoExtentObj); proj.scale((scaleW + scaleH) / 2); } const currentCenter = proj(geoCenter); const expectedCenter = [x1/2, y1/2]; let translation = proj.translate(); translation[0] += (expectedCenter[0] - currentCenter[0]); translation[1] += (expectedCenter[1] - currentCenter[1]); proj.translate(translation); return proj; }4c:T47b,neighborEncodings = { const values = { n: 16, e: 32, s: 64, w: 128 } const options = []; const empty = { value: 0, n: false, e: false, s: false, w: false }; Object.freeze(empty); for (const [dir, value] of Object.entries(values)) { const f = Object.assign({}, empty); const t = Object.assign({}, empty, { value }); t[dir] = true; options.push([t, f]); } const combos = []; for (const rawCombo of d3.cross(...options)) { const combo = Object.assign({}, empty); for (const v of rawCombo) { combo.value += v.value; Object.keys(combo).forEach(d => combo[d] ||= v[d]); } combos[combo.value] = _.pick(combo, ["n", "e", "s", "w"]); } Object.freeze(combos); combos.forEach(c => Object.freeze(c)); const emptyCombo = { n: false, e: false, s: false, w: false }; function decode(value) { return combos[value] ?? emptyCombo; } function encode(obj) { if (!obj) return 0; const valuesToEncode = Object.entries(obj).filter(e => e[1]).map(e => e[0]); return _.sum(valuesToEncode.map(s => values[s])); } return { values, encode, decode } }4d:T6e9,async function gpuProcessImage(image, options) { const pixelVectors = new Map(); pixelVectors.getOrCreate = (key) => { let maskSet = pixelVectors.get(key); if (!maskSet) pixelVectors.set(key, maskSet = new MaskSet(XydMask)); return maskSet; } function ingestTilePixelVectors(tilePixelVectors) { debugger; for (let [colorNum, newVectors] of tilePixelVectors) { pixelVectors.getOrCreate(colorNum).addValues(newVectors); } } const coordClasses = new MaskMap(CoordMask); function ingestTileCoordClasses(tileCoordClasses) { for (let [coord, coordClass] of tileCoordClasses) { coordClasses.set(coord, coordClass); } } const { colorTable, wrapX, maxTileSize, fnOnTileProcessed } = (options ?? {}); const arrays = {}; const tileSlicer = new TileSlicer(image, { wrapX, maxTileSize }); const reglProgram = getReglProgram(tileSlicer.baseTileSize, colorTable); for (let rect of _.sortBy(tileSlicer.getTileRects(), [r => -r.width * r.height])) { const bitmap = await tileSlicer.getTileBitmap(rect); const gpuOutput = await gpuProcessTile(bitmap, rect, reglProgram, { fnOnTileProcessed, wrapX, arrays }); bitmap.close(); const tilePixelVectors = await extractPixelVectors(gpuOutput); ingestTilePixelVectors(tilePixelVectors); await pauseIfNeeded(); const tileCoordClasses = await extractCoordClasses(gpuOutput); ingestTileCoordClasses(tileCoordClasses); await pauseIfNeeded(); } const polygonRings = await pixelVectorsToRings(pixelVectors, coordClasses, [tileSlicer.imageWidth, tileSlicer.imageHeight]); const bbox = [0, 0, image.naturalWidth ?? image.width, image.naturalHeight ?? image.height]; return { bbox, polygonRings, coordClasses, wrapX: !!wrapX }; }4e:T8a9,async function gpuProcessTile(bitmap, rect, reglProgram, options) { const { regl, commands } = reglProgram; const { fnOnTileProcessed, wrapX, arrays } = Object.assign({ fnOnTileProcessed: () => true, wrapX: false, arrays: {} }, options); fnOnTileProcessed ??= () => true; const tileTexture = regl.texture({ data: bitmap }); const tileDimensions = [ bitmap.width, bitmap.height ]; const params = {}; for (let name of ["color", "neighbors", "coords"]) { const buffer = regl.framebuffer({ depthStencil: false, shape: tileDimensions }); const cropRect = {...rect.crop}; if (name == "coords") { if (rect.mapEdges.e) cropRect.width++; if (rect.mapEdges.s) cropRect.height++; } let data = arrays[name] ; const { width, height } = cropRect; const exportByteLength = (4 * width * height); if (!data || data.length != exportByteLength) data = params[name] = new Uint8Array(exportByteLength); params[name] = { buffer, cropRect, data }; } const result = { offset: [rect.x, rect.y], mapEdges: rect.mapEdges, wrapX: !!wrapX }; async function createPixelIO(name) { let { buffer, cropRect, data } = params[name]; regl.read({ framebuffer: buffer, ...cropRect, data }); const result = new PixelIO(cropRect.width, cropRect.height, data); await pauseIfNeeded(); return result; } // execute replaceColors onto the canvas, save the output to result commands.replaceColors({ uSampler: tileTexture, framebuffer: params.color.buffer }); result.colorIO = await createPixelIO("color"); // execute findNeighbors onto the canvas, save the output to result commands.findNeighbors({ uSampler: params.color.buffer, framebuffer: params.neighbors.buffer }); result.neighborsIO = await createPixelIO("neighbors"); // execute findNeighbors onto the canvas, save the output to result commands.classifyCoords({ uSampler: params.color.buffer, framebuffer: params.coords.buffer }); result.coordsIO = await createPixelIO("coords"); [tileTexture, ...Object.values(params).map(p => p.buffer)].forEach(r => r.destroy()); closeMapEdges(result); fnOnTileProcessed(result, rect.unpadded); return result; }4f:T787,function closeMapEdges(gpuTileOutput) { const { colorIO, neighborsIO, coordsIO, mapEdges, wrapX } = gpuTileOutput; const { width, height } = colorIO; const xValues = d3.range(0, width); const yValues = d3.range(0, height); const mapEdgePixels = {}; if (mapEdges.n) mapEdgePixels.n = d3.cross(xValues, [0]); if (mapEdges.e) mapEdgePixels.e = d3.cross([width-1], yValues); if (mapEdges.s) mapEdgePixels.s = d3.cross(xValues, [height-1]); if (mapEdges.w) mapEdgePixels.w = d3.cross([0], yValues); for (let dir of Object.keys(mapEdgePixels)) { mapEdgePixels[dir] = mapEdgePixels[dir].filter(coord => colorIO.getColorNum(...coord)); } // neighborsIO for (let [dir, pixels] of Object.entries(mapEdgePixels)) { for (let pixel of pixels) { const neighborColor = ColorMask.toObject(neighborsIO.getColorNum(...pixel)); const neighbors = {...neighborEncodings.decode(neighborColor.r)}; neighbors[dir] = true; neighborColor.r = neighborEncodings.encode(neighbors); neighborColor.a = 255; neighborsIO.setColorNum(...pixel, ColorMask.fromObject(neighborColor)); } } // coordsIO if (!wrapX) return; const junctionColorNum = ColorMask.fromArray([coordEncodings.values.junction, 0, 0, 255]); const coordsToUpdate = new MaskSet(CoordMask); const pixelToCoords = { n: ([x,y]) => [[x, y ], [x+1, y ]], // Along the north edge of the map, we want the NW and NE corners of the pixel e: ([x,y]) => [[x+1, y ], [x+1, y+1]], s: ([x,y]) => [[x, y+1], [x+1, y+1]], w: ([x,y]) => [[x, y ], [x, y+1]] }; for (let [dir, pixels] of Object.entries(mapEdgePixels)) { pixels.flatMap(p => pixelToCoords[dir](p)).forEach(c => coordsToUpdate.add(c)); } for (let coord of coordsToUpdate) { if (coord[0] < coordsIO.width && coord[1] < coordsIO.height) { coordsIO.setColorNum(...coord, junctionColorNum); } } }50:T52d,async function extractPixelVectors(gpuOutput) { const { colorIO, neighborsIO, offset } = gpuOutput; // Fork of http://defghi1977.html.xdomain.jp/tech/dotrace/dotrace.htm const tileColorVectors = new Map(); tileColorVectors.getOrCreate = (key) => { let maskSet = tileColorVectors.get(key); if (!maskSet) tileColorVectors.set(key, maskSet = new MaskSet(XydMask)); return maskSet; } const { width, height } = colorIO; let counter = 0; for (let { colorNum: neighborColorNum, x: tileX, y: tileY } of neighborsIO.getNonZeroPixels()) { const colorNum = colorIO.getColorNum(tileX, tileY); const x = tileX + offset[0]; const y = tileY + offset[1]; const vectors = tileColorVectors.getOrCreate(colorNum); const neighborValue = ColorMask.toArray(neighborColorNum)[0]; const decoded = neighborEncodings.decode(neighborValue); const { n, e, s, w } = decoded; // pixelData.n means it has a neighbor to the north, so we want to draw the eastward-pointing vector, etc. if (n) vectors.add([x, y, XydMask.direcs.e]); if (e) vectors.add([x+1, y, XydMask.direcs.s]); if (s) vectors.add([x+1, y+1, XydMask.direcs.w]); if (w) vectors.add([x, y+1, XydMask.direcs.n]); if (counter++ % 5000 == 0) await pauseIfNeeded(); } return tileColorVectors; }51:T891,pixelVectorsToRings = { const direcs = XydMask.direcs; function toNext([x, y, d], nd) { switch (d) { case direcs.e: x++; break; case direcs.s: y++; break; case direcs.w: x--; break; case direcs.n: y--; break; } return [x, y, nd]; } function getNextCandidates([x, y, d]) { const options = []; const skipD = (d + 2) % 4; for (let i = 0; i > -4; i--) { const nd = (d + i) & 3; if (nd == skipD) continue; options.push(toNext([x, y, d], (d + i) & 3)); } return options; } // Fork of http://defghi1977.html.xdomain.jp/tech/img2svg3/dot2svg3.htm function colorPixelVectorsToRings(vectors, junctions) { // This function consumes the vectors set; protect the original const vectorsCopy = new MaskSet(XydMask); vectorsCopy.addValues(vectors.values()); vectors = vectorsCopy; const findNext = (x, y, d) => { const candidates = getNextCandidates([x, y, d]); return candidates.find(c => vectors.has(c)); }; const dirs = Object.keys(XydMask.direcs); let result = [], path = []; let x = 0, y = 0, d = 0; let nx = 0, ny = 0, nd = 0; for (let vector of vectors.values()){ if (!vectors.has(vector)) return; vectors.delete(vector); let [x, y, d] = vector; path = [[x, y]]; result.push(path); for (;;){ const next = findNext(x, y, d); if (next === undefined) break; vectors.delete(next); [nx, ny, nd] = next; if (d != nd || junctions.has([nx, ny])) path.push([nx, ny]); [x, y, d] = [nx, ny, nd]; } } result.forEach(p => p.push([...p[0]])); return result; } function pixelVectorsToRings(pixelVectors, coordClasses) { const junctions = new MaskSet(CoordMask); for (let [coord, coordClass] of coordClasses) { if (coordClass == "junction") junctions.add(coord); } const polygonRings = new Map(); for (let [colorNum, vectors] of pixelVectors) { const rings = colorPixelVectorsToRings(vectors, junctions); polygonRings.set(colorNum, rings); } return polygonRings; } return pixelVectorsToRings; }52:T774,function buildGeoJsonForPolygon(ringCoords) { const { Orientation, Coordinate } = jsts; const polygonMeta = ringCoords.map(rc => { const coords = rc.map(c => new Coordinate(...c)); const group = Orientation.isCCW(coords) ? "shellMeta" : "holeMeta"; const ring = jstsFactory.createLinearRing(coords); const polygon = jstsFactory.createPolygon(ring); return { coords: rc, ring, polygon, group, bbox: Bbox.fromPoints(rc), area: polygon.getArea() }; }); polygonMeta.sort((a,b) => a.area - b.area); let { shellMeta, holeMeta } = _.groupBy(polygonMeta, rm => rm.group); shellMeta ??= []; holeMeta ??= []; shellMeta.forEach(shell => shell.holeCoords = []); for (let hole of holeMeta) { let shell; if (shellMeta.length == 1) { shell = shellMeta[0]; } else { const candidates = shellMeta.filter(shell => shell.area > hole.area && Bbox.covers(shell.bbox, hole.bbox)); if (candidates.length == 1) { shell = candidates[0]; } else { shell = candidates.find(shell => shell.polygon.covers(hole.polygon)); } } if (!shell) { throw "couldn't find shell for hole"; } shell.holeCoords.push(hole.coords); } const islandCoords = shellMeta.map(shell => [shell.coords, ...shell.holeCoords]); const polygon = (islandCoords.length == 1) ? turf.polygon(islandCoords[0]) : turf.multiPolygon(islandCoords); return polygon.geometry; /* const islands = []; for (let shell of shellMeta) { const holeRings = shell.holeRings; if (holeRings.length == 0) { islands.push(shell.polygon); } else { islands.push(jstsFactory.createPolygon(shell.ring, shell.holeRings)); } } const geometry = jstsFactory.createMultiPolygon(islands); //.buffer(0); return jstsWriter.write(geometry); */ }53:T446,async function buildTopology(traceResult, options) { options = Object.assign({ smooth: true }, options); options.round ??= (options.smooth && !options.projection); const geojson = await buildGeoJsonRaw(traceResult); let topology = topojson.topology({traced: geojson}); topology.properties = { options }; topology.bbox = [...traceResult.bbox]; topology.arcs = topology.arcs.map(a => a.map(c => [...c])); if (options.smooth) { smoothTopology(topology, traceResult.coordClasses); // Remove unneeded points const simplified = topojson.presimplify(topology); simplified.arcs.flat() .filter(c => c[2] == 0 && traceResult.coordClasses.get(c) == "junction") .forEach(c => c[2] = Infinity); topology = topojson.simplify(simplified, 0.5 / smoothTopology.roundFactor); // Round to int if (options.round) { scaleTopology(topology, smoothTopology.roundFactor); } } if (options.projection) { const proj = options.projection; topology.arcs = topology.arcs.map(a => a.map(c => proj.invert(c))); } return topology; }54:Ta4d,smoothTopology = { function smoothArc(arc, coordClasses) { const arcCoordClasses = arc.map(c => coordClasses.get(c)); const smoothArc = []; smoothArc.maybePush = function (coord) { const prevCoord = smoothArc.at(-1); if (prevCoord && prevCoord[0] == coord[0] && prevCoord[1] == coord[1]) return; smoothArc.push(coord); } function getSegmentToNext(fromCoordIndex) { const fromCoord = arc[fromCoordIndex]; if (!fromCoord) return; const toCoord = arc[fromCoordIndex + 1]; if (!toCoord) return; const axis = (fromCoord[0] != toCoord[0]) ? 0 : 1; return { fromCoordIndex, axis, delta: toCoord[axis] - fromCoord[axis] } } let coord, coordClass, prevSegment, nextSegment, axis, delta, maxShiftAmount, shiftAmount; for (let i = 0; i < arc.length; i++) { coord = arc[i]; coordClass = arcCoordClasses[i]; maxShiftAmount = Infinity; switch (coordClass) { case "junction": maxShiftAmount = 0; break; case "intrusion": case "corner": maxShiftAmount = 0.25; break; } if (maxShiftAmount == 0) { smoothArc.maybePush([...coord]); continue; } if (!prevSegment || prevSegment.fromCoordIndex != i-1) { prevSegment = getSegmentToNext(i-1); } if (prevSegment) { let { delta, axis } = prevSegment; delta *= -1; shiftAmount = Math.sign(delta) * Math.min(maxShiftAmount, Math.abs(delta)/2); const newCoord = [coord[0], coord[1]]; newCoord[axis] += shiftAmount; smoothArc.maybePush(newCoord); } nextSegment = getSegmentToNext(i); if (nextSegment) { let { delta, axis } = nextSegment; shiftAmount = Math.sign(delta) * Math.min(maxShiftAmount, Math.abs(delta)/2); const newCoord = [coord[0], coord[1]]; newCoord[axis] += shiftAmount; smoothArc.maybePush(newCoord); } prevSegment = nextSegment; } const first = arc[0]; const last = arc.at(-1); if (first[0] == last[0] && first[1] == last[1]) { smoothArc.maybePush([...smoothArc[0]]); } delete smoothArc.maybePush return smoothArc; } function smoothTopology(topology, coordClasses) { if (!topology.properties?.isSmoothed) { topology.arcs = topology.arcs.map(a => smoothArc(a, coordClasses)); topology.properties ??= {}; topology.properties.isSmoothed = true; } return JSON.stringify(topology); } smoothTopology.roundFactor = 4; return smoothTopology; }55:T49e,class LoadIndicator { constructor(image) { const sourceWidth = image.naturalWidth ?? image.width; const sourceHeight = image.naturalHeight ?? image.height; const targetWidth = devicePixelRatio * window.innerWidth; let downscaleFactor = 1; while (sourceWidth / downscaleFactor > targetWidth) downscaleFactor++; downscaleFactor--; this.downscaleFactor = downscaleFactor; const width = this.width = Math.floor(sourceWidth / downscaleFactor); const height = this.height = Math.floor(sourceHeight / downscaleFactor); const canvas = this.canvas = DOM.canvas(width, height); canvas.style.filter = "grayscale(0.98)"; canvas.style.maxWidth = "100%"; const ctx = this.ctx = this.canvas.getContext("2d"); ctx.drawImage(image, 0, 0, width, height); this.onTileProcessed = this._onTileProcessed.bind(this); } _onTileProcessed(result, sourceRect) { const tileImage = result.colorIO.drawToBitmap(); const drawParams = ["x", "y", "width", "height"].map(k => Math.round(sourceRect[k] / this.downscaleFactor)); this.ctx.clearRect(...drawParams); this.ctx.drawImage(tileImage, ...drawParams); } }56:T530,async function downscaleImage(imageSource, downscaleFactor) { const width = imageSource.naturalWidth ?? imageSource.width; const height = imageSource.naturalHeight ?? imageSource.height; const newWidth = Math.round(width / downscaleFactor); const newHeight = Math.round(height / downscaleFactor); const stepX = width / newWidth; const offsetX = Math.round(stepX / 2 - 0.5); const stepY = height / newHeight; const offsetY = Math.round(stepY / 2 - 0.5); const srcCanvas = new OffscreenCanvas(width, height); const srcCtx = srcCanvas.getContext("2d", { alpha: false, desynchronized: true }); srcCtx.drawImage(imageSource, 0, 0); const srcArray = srcCtx.getImageData(0, 0, width, height).data; const destArray = new Uint8ClampedArray(4 * newWidth * newHeight); let i = 0; for (let y = 0; y < newHeight; y++) { const srcY = Math.min(Math.round(offsetX + y * stepY), height); for (let x = 0; x < newWidth; x++) { const srcX = Math.min(Math.round(offsetY + x * stepX), width); const si = 4 * (srcY * width + srcX); destArray[i] = srcArray[si]; destArray[i+1] = srcArray[si+1]; destArray[i+2] = srcArray[si+2]; destArray[i+3] = srcArray[si+3]; i += 4; } } return await createImageBitmap(new ImageData(destArray, newWidth, newHeight)); }57:T50d,ColorMask = { function fromArray([r, g, b, a]) { return ( r << 24 | g << 16 | b << 8 | a ) >>> 0; } function toArray(number) { const r = (number & 0xff000000) >>> 24; const g = (number & 0x00ff0000) >>> 16; const b = (number & 0x0000ff00) >>> 8; const a = (number & 0x000000ff); return [r, g, b, a]; } function fromObject(rgba) { if (!rgba) return 0; return fromArray([rgba.r, rgba.g, rgba.b, rgba.a ?? 255]); } function toObject(number) { const [r, g, b, a] = toArray(number); return { r, g, b, a }; } function fromHex(hexColor) { hexColor = hexColor.replace(/^[#x]|0x/i, ""); if (hexColor.length == 3) { hexColor += "f"; } if (hexColor.length == 4) { hexColor = [...hexColor].map(c => c + c).join("") return Number(`0x${hexColor}`); } if (hexColor.length == 6) { hexColor += "ff"; } if (hexColor.length == 8) { return Number(`0x${hexColor}`); } throw "wyd" } function toHex(number) { const [r, g, b, a] = toArray(number); const values = (a == 255) ? [r, g, b] : [r, g, b, a] return "#" + values.map(c => c.toString(16).padStart(2, "0")).join(""); } return { fromArray, toArray, fromObject, toObject, fromHex, toHex }; }58:T7ff,class MaskSet extends Set { constructor(maskType) { super(); this._fnFromArray = maskType.fromArray; this._fnToArray = maskType.toArray; this._values = new Map(); this._numericSet = new Set(); for (let name of ["_fnFromArray", "_fnToArray", "_values", "_numericSet"]) { const prop = Object.getOwnPropertyDescriptor(this, name); prop.enumerable = false; Object.defineProperty(this, name, prop); } } static around(numericSet, maskType) { const s = new MaskSet(maskType); s._numericSet = numericSet; return s; } decompose() { return new Uint32Array(this._numericSet); } recompose(uint32Values) { return MaskSet.around(new Set(uint32Values)); } get numericSet() { return this._numericSet; } clear() { this.numericSet.clear(); this._values.clear(); } add(value) { const numValue = this._fnFromArray(value); this.numericSet.add(numValue); if (!this._values.has(numValue)) this._values.set(numValue, value); return this._values.get(numValue); } addValues(values) { const result = []; for (let value of values) result.push(this.add(value)); return result; } delete(value) { const numValue = this._fnFromArray(value); this.numericSet.delete(numValue); this._values.delete(numValue); } has(value) { const numValue = this._fnFromArray(value); return this.numericSet.has(numValue); } get size() { return this._numericSet.size; } *[Symbol.iterator]() { for (let numValue of this.numericSet[Symbol.iterator]()) { yield this._values.get(numValue) ?? this.add(this._fnToArray(numValue)); } } entries() { return wrapIterator('Set Iterator', this, e => [e, e]); } keys() { return wrapIterator('Set Iterator', this); } values() { return wrapIterator('Set Iterator', this); } forEach(callbackFn, thisArg) { if (arguments.length > 1) throw "Not implemented" for (let value of this) { callbackFn(value, value, this); } } } 59:T92a,class MaskMap extends Map { constructor(maskType) { super(); this._fnFromArray = maskType.fromArray; this._fnToArray = maskType.toArray; this._keyValues = new Map(); this._numericMap = new Map(); for (let name of ["_fnFromArray", "_fnToArray", "_keyValues", "_numericMap"]) { const prop = Object.getOwnPropertyDescriptor(this, name); prop.enumerable = false; Object.defineProperty(this, name, prop); } } static around(numericMap, maskType) { const m = new MaskMap(maskType); m._numericMap = numericMap; return m; } decompose() { let [keys, values] = [...this._numericMap.entries()]; keys = new Uint32Array(keys); return { keys, values }; } recompose(uint32Keys, values) { const entries = values.map((v,i) => [uint32Keys[i], v]); return MaskSet.around(new Map(entries)); } get numericMap() { return this._numericMap; } clear() { this._keyValues.clear(); this._numericMap.clear(); } set(key, value) { const numKey = this._fnFromArray(key); this._keyValues.set(numKey, key); this._numericMap.set(numKey, value); return value; } maybeSet(key, value) { const numKey = this._fnFromArray(key); const currentValue = this._numericMap.get(numKey); return currentValue ?? this.set(key, value); } get(key) { const numKey = this._fnFromArray(key); return this._numericMap.get(numKey); } delete(key) { const numKey = this._fnFromArray(key); this._keyMap.delete(numKey); this._numericMap.delete(numKey); } has(key) { const numKey = this._fnFromArray(key); return this._numericMap.has(numKey); } get size() { return this._numericMap.size; } *[Symbol.iterator]() { for (let [numKey, value] of this._numericMap) { if (!this._keyValues.has(numKey)) this._keyValues.set(numKey, this._fnToArray(numKey)); yield [this._keyValues.get(numKey), value]; } } entries() { return wrapIterator('Map Iterator', this); } keys() { return wrapIterator('Map Iterator', this, e => e[0]); } values() { return wrapIterator('Map Iterator', this, e => e[1]); } forEach(callbackFn, thisArg) { if (arguments.length > 1) throw "Not implemented" for (let [key, value] of this) { callbackFn(value, key, this); } } } 5a:T81a,class PixelIO { constructor(width, height, array) { this.width = width; this.height = height; array ??= new Uint32Array(width * height); this.dataView = new DataView(array.buffer); } _getOffset(x, y) { if (x >= this.width || y >= this.height) return -1; return 4 * (y * this.width + x); } _getXy(byteOffset) { const pixelNum = byteOffset >>> 2; // Equivalent to Math.floor(i/4); return [pixelNum % this.width, Math.floor(pixelNum / this.width)]; } getColorNum(x, y) { return this.dataView.getUint32(this._getOffset(x, y)); } getColorNum(x, y) { return this.dataView.getUint32(this._getOffset(x, y)); } *getNonZeroPixels() { const byteLength = this.dataView.byteLength; for (let i = 0; i < byteLength; i += 4) { const colorNum = this.dataView.getUint32(i); if (colorNum) { const [x, y] = this._getXy(i) yield { x, y, colorNum }; } } } setColorNum(x, y, colorNum) { this.dataView.setUint32(this._getOffset(x, y), colorNum); } drawTo(canvasOrContext, dx = 0, dy = 0, ...putImageDataArgs) { let ctx = (canvasOrContext.getContext) ? canvasOrContext.getContext("2d") : canvasOrContext; const dataArray = new Uint8ClampedArray(this.dataView.buffer); const imageData = new ImageData(dataArray, this.width, this.height); ctx.putImageData(imageData, dx, dy, ...putImageDataArgs); } drawToBitmap() { const canvas = new OffscreenCanvas(this.width, this.height); this.drawTo(canvas); return canvas.transferToImageBitmap(); } static fromImageSource(src) { let imageData; if (src instanceof ImageData) { imageData = src; } else { const canvas = new OffscreenCanvas(src.naturalWidth ?? src.width, src.naturalHeight ?? src.height); const ctx = canvas.getContext("2d", { willReadFrequently: true }); ctx.drawImage(src, 0, 0); imageData = ctx.getImageData(0, 0, canvas.width, canvas.height); } return new PixelIO(imageData.width, imageData.height, imageData.data); } }5b:T4ff,class TileSlicer extends TileSlicerBase { constructor(image, options) { const bitmap = createBitmap(image); super(bitmap.width, bitmap.height, options); const { imageWidth, imageHeight, padding, totalPadding } = this; const canvas = new OffscreenCanvas(imageWidth + totalPadding, imageHeight + totalPadding); const ctx = canvas.getContext("2d"); ctx.drawImage(bitmap, padding, padding); const wh = [padding, imageHeight]; if (options?.wrapX) { ctx.drawImage(bitmap, imageWidth - padding, 0, ...wh, 0, padding, ...wh); ctx.drawImage(bitmap, 0, 0, ...wh, imageWidth + padding, padding, ...wh); } bitmap.close(); this.bitmap = createBitmap(canvas); canvas.width = 0; canvas.height = 0; this._tileBitmapRefs = []; } destroy() { const bitmaps = [this.bitmap, ...this._tileBitmapRefs.map(r => r.deref())].filter(b => b); bitmaps.forEach(b => b.close()); } async getTileBitmap(rect) { if (isNaN(rect.x)) return; const tileBitmap = await createImageBitmap(this.bitmap, rect.x, rect.y, rect.width, rect.height); this._tileBitmapRefs.push(new WeakRef(tileBitmap)); return tileBitmap; } }5c:T99c,class TileSlicerBase { constructor(imageWidth, imageHeight, options) { const { maxTileSize, padding } = Object.assign({ maxTileSize: Infinity, padding: 5 }, options); this.imageWidth = imageWidth; this.imageHeight = imageHeight; this.padding = padding; const totalPadding = this.totalPadding = this.padding * 2; this.paddedWidth = imageWidth + totalPadding; this.paddedHeight = imageHeight + totalPadding; this.baseTileSize = Math.min(maxTileSize + totalPadding, GLHelper.maxTextureSize); this._baseTileSizeInner = this.baseTileSize - totalPadding; } get imageSize() { return [this.width, this.height]; } get tileCount() { const counts = this.tileCounts; return counts[0] * counts[1]; } get tileCounts() { const { imageWidth, imageHeight, _baseTileSizeInner } = this; let countX = Math.ceil(imageWidth / _baseTileSizeInner); let countY = Math.ceil(imageHeight / _baseTileSizeInner); return [countX, countY]; } get tileIndices() { const [xCount, yCount] = this.tileCounts; return _.sortBy(d3.cross(d3.range(0, xCount), d3.range(0, yCount)), [1, 0]) ; } getTileRect(tileX, tileY) { const { imageWidth, imageHeight, _baseTileSizeInner, padding, totalPadding } = this; const [x0, y0] = [tileX, tileY].map(c => c * _baseTileSizeInner); const x1 = Math.min(x0 + _baseTileSizeInner, imageWidth); const y1 = Math.min(y0 + _baseTileSizeInner, imageHeight); const mapEdges = { n: y0 == 0, e: x1 == imageWidth, s: y1 == imageHeight, w: x0 == 0 }; let rect = { x: x0, y: y0, width: x1 - x0 + totalPadding, height: y1 - y0 + totalPadding, padding, mapEdges }; if (rect.width <= 0 || rect.height <= 0) rect = { x: NaN, y: NaN, width: NaN, height: NaN, padding: NaN, mapEdges: {} }; rect = Object.assign(rect, this.unpadRect(rect)); return rect; } getTileRects() { return this.tileIndices.map(t => this.getTileRect(...t)); } unpadRect(rect) { const { padding, totalPadding } = this; if (padding == 0 || isNaN(rect.x)) return { unpadded: rect, crop: rect }; const unpadded = { x: rect.x, y: rect.y, width: rect.width - totalPadding, height: rect.height - totalPadding, mapEdges: rect.mapEdges }; const crop = { x: padding, y: padding, width: unpadded.width, height: unpadded.height } return { unpadded, crop }; } }5d:T7c6,class Bbox { static isEqual(bbox1, bbox2) { if (bbox1 == bbox2) return true; return (bbox1?.length == 4 && bbox1?.length == 4 && bbox1[0] == bbox2[0] && bbox1[1] == bbox2[1] && bbox1[2] == bbox2[2] && bbox1[3] == bbox2[3]); } static contains(bbox1, bbox2) { if (bbox1 == bbox2) return false; return (bbox1?.length === bbox2?.length && bbox1[0] < bbox2[0] && bbox1[1] < bbox2[1] && bbox1[2] > bbox2[2] && bbox1[3] > bbox2[3]); } static covers(bbox1, bbox2) { if (bbox1 == bbox2) return true; return (bbox1?.length === bbox2?.length && bbox1[0] <= bbox2[0] && bbox1[1] <= bbox2[1] && bbox1[2] >= bbox2[2] && bbox1[3] >= bbox2[3]); } static containsPoint(bbox, point) { return Bbox.contains(bbox, [...point, ...point]); } static coversPoint(bbox, point) { return Bbox.covers(bbox, [...point, ...point]); } static isPointOnEdge(bbox, point) { return bbox[0] == point[0] || bbox[1] == point[1] || bbox[2] == point[0] || bbox[3] == point[1]; } static width(bbox) { return bbox[2] - bbox[0]; } static height(bbox) { return bbox[3] - bbox[1]; } static dims(bbox) { return { x: bbox[0], y: bbox[1], width: Bbox.width(bbox), height: Bbox.height(bbox) }; } static fromDims(dims) { return [ dims.x, dims.y, dims.width - dims.x, dims.height - dims.y ]; } static fromPoints(points) { let x0 = Infinity, y0 = Infinity, x1 = -Infinity, y1 = -Infinity; for (let [x, y] of points) { if (x < x0) x0 = x; if (x > x1) x1 = x; if (y < y0) y0 = y; if (y > y1) y1 = y; } return [x0, y0, x1, y1]; } static area(bbox) { return Bbox.width(bbox) * Bbox.height(bbox); } static buffer(bbox, amount) { return [bbox[0] - amount, bbox[1] - amount, bbox[2] + amount, bbox[3] + amount]; } }5e:T436,viewof findNeighborsFragShader = { let defines = Object.entries(neighborEncodings.values) .map(([key, value]) => `float f${_.startCase(key)} = ${(value / 255).toFixed(32)};`) .join("\n"); return highlightGlsl.fragment(`#version 300 es precision highp float; // neighborFinderFragShader ${defines.trim()} uniform sampler2D uSampler; out vec4 fragColor; void main () { ivec2 xyC = ivec2(round(gl_FragCoord.xy - 0.5)); vec4 cC = texelFetch(uSampler, xyC, 0); vec4 cN = texelFetchOffset(uSampler, xyC, 0, ivec2( 0, -1)); vec4 cE = texelFetchOffset(uSampler, xyC, 0, ivec2( 1, 0)); vec4 cS = texelFetchOffset(uSampler, xyC, 0, ivec2( 0, 1)); vec4 cW = texelFetchOffset(uSampler, xyC, 0, ivec2(-1, 0)); float encodedNeighbors = 0.0; if (cC.a > 0.0) { if (cC != cN) encodedNeighbors += fN; if (cC != cE) encodedNeighbors += fE; if (cC != cS) encodedNeighbors += fS; if (cC != cW) encodedNeighbors += fW; } float alpha = (encodedNeighbors == 0.0) ? 0.0 : 1.0; fragColor = vec4(encodedNeighbors, 0.0, 0.0, alpha); }`); }5f:T14ee,viewof classifyCoordsFragShader = { const coordDefines = Object.entries(coordEncodings.values) .map(([key, value]) => `const float f${_.startCase(key)} = ${(value / 255).toFixed(32)};`) .join("\n"); // Starts with north and goes clockwise const dirKeys4 = ["N", "E", "S", "W"];; const dirKeys = ["N", "NE", "E", "SE", "S", "SW", "W", "NW"]; const cAndDirKeys = ["C", ...dirKeys]; const compassPointsN = [[0,-1],[1,-1],[1,0],[1,1],[0,1],[-1,1],[-1,0],[-1,-1]]; const compassPoints = { N: compassPointsN, E: [...compassPointsN.slice(2), ...compassPointsN.slice(0, 2)], S: [...compassPointsN.slice(4), ...compassPointsN.slice(0, 4)], W: [...compassPointsN.slice(6), ...compassPointsN.slice(0, 6)] } const compassCenters = { N: [ 0, 0], E: [-1, 0], S: [-1, -1], W: [ 0, -1] } return highlightGlsl.fragment(`#version 300 es precision highp float; // classifyCoordsFragShader ${coordDefines.trim()} uniform sampler2D uSampler; struct directions { ${cAndDirKeys.map(k => ` ivec2 ${k};`).join("\n").trim() /* ivec2 C, ivec2 N...NW */} }; struct directionColors { ${cAndDirKeys.map(k => ` vec4 ${k};`).join("\n").trim() /* vec4 C, vec4 N...NW */} }; ${Object.entries(compassPoints) /* const directions directions[N..W] = ... */ .map(([key, values]) => { const params = [compassCenters[key], ...values].map(([x,y]) => `ivec2(${x}, ${y})`).join(", "); return `const directions directions${key} = directions(${params});` }) .join("\n")} directionColors readColors(ivec2 xyC, directions dirs) { ivec2 newXyC = xyC + dirs.C; vec4 cC = texelFetch(uSampler, newXyC, 0); return directionColors(cC, ${dirKeys.map(dir => `texelFetch(uSampler, newXyC + dirs.${dir}, 0)`).join(", ") /* texelFetch(uSampler, newXyC + dirs.[N..NW], 0) */}); } bool isJunction(directionColors dirColors) { // Count the number of unique colors in the 4px range [C, W, NW, N] int colorCount = 1; vec4 uniqueColor1 = dirColors.C; vec4 uniqueColor2 = vec4(-1.0); vec4 uniqueColor3 = vec4(-1.0); if (dirColors.W != uniqueColor1) { colorCount++; uniqueColor2 = dirColors.W; } if (dirColors.NW != uniqueColor1 && dirColors.NW != uniqueColor2) { colorCount++; uniqueColor3 = dirColors.NW; } if (dirColors.N != uniqueColor1 && dirColors.N != uniqueColor2 && dirColors.N != uniqueColor3) { colorCount++; } if (colorCount >= 3) { // Standard junction: 3 distinct colors touch at this coord return true; } if (colorCount == 2 && dirColors.C == dirColors.NW && dirColors.N == dirColors.W) { // Special case junction: 2 distinct colors in an hourglass shape 4-pixel diagonal hourglass return true; } return false; } bool isMaybeCorner(directionColors dirColors) { return (dirColors.C != dirColors.W && dirColors.C != dirColors.NW && dirColors.C != dirColors.N); } bool isIntrusion(directionColors dirColors, ivec2 xyC, directions dirs) { // Assumption: isMaybeCorner test already passed // Horizontal check for (int i = 1; i < 5; i++) { ivec2 xyE = xyC + i * dirs.E; vec4 cE = texelFetch(uSampler, xyE, 0); vec4 cNE = texelFetch(uSampler, xyE + dirs.N, 0); if (cNE == dirColors.C) { // It advanced north again. This isn't an intrusion. break; } if (cE != dirColors.C) { // It retreated south without advancing north return true; } } // Vertical check for (int i = 1; i < 5; i++) { ivec2 xyS = xyC + i * dirs.S; vec4 cS = texelFetch(uSampler, xyS, 0); vec4 cSW = texelFetch(uSampler, xyS + dirs.W, 0); if (cSW == dirColors.C) { // It advanced west again. Not an intrusion. break; } if (cS != dirColors.C) { // It retreated east without advancing west. return true; } } return false; } bool isCorner(directionColors dirColors) { // Assumption: isMaybeCorner test already passed if (dirColors.C == dirColors.NE || dirColors.C == dirColors.SW) return false; return (dirColors.C == dirColors.E && dirColors.C == dirColors.SE && dirColors.C == dirColors.S); } out vec4 fragColor; void main () { fragColor = vec4(0.0); ivec2 xyC = ivec2(round(gl_FragCoord.xy - 0.5)); directions[4] allDirs = directions[4](${dirKeys4.map(k => `directions${k}`).join(", ")}); directionColors dirColorsN = readColors(xyC, directionsN); // Junction test if (isJunction(dirColorsN)) { fragColor = vec4(fJunction, 0.0, 0.0, 1.0); return; } directionColors[4] allDirColors = directionColors[4](dirColorsN, ${d3.range(1,4).map(i => `readColors(xyC, allDirs[${i}])`).join(", ")}); bool[4] allDirMaybes = bool[4](${d3.range(0,4).map(i => `isMaybeCorner(allDirColors[${i}])`).join(", ")}); // Intrusion test for (int i = 0; i < 4; i++) { if (!allDirMaybes[i]) continue; directionColors dirColors = allDirColors[i]; directions dirs = allDirs[i]; ivec2 xyCOffset = xyC + dirs.C; if (isIntrusion(dirColors, xyCOffset, dirs)) { fragColor = vec4(fIntrusion, 0.0, 0.0, 1.0); return; } } // Corner test for (int i = 0; i < 4; i++) { if (!allDirMaybes[i]) continue; directionColors dirColors = allDirColors[i]; if (isCorner(dirColors)) { fragColor = vec4(fCorner, 0.0, 0.0, 1.0); return; } } }`); }60:[{"id":"419206c2660bd2d081798acee891dc64fcf3dac4eb02df1f3eb32df465d8d805559adab38e46a79bc211f93416183201b6aa1c242600750617acea74ef60cdcc","href":"https://static.observableusercontent.com/files/419206c2660bd2d081798acee891dc64fcf3dac4eb02df1f3eb32df465d8d805559adab38e46a79bc211f93416183201b6aa1c242600750617acea74ef60cdcc","name":"worldMap2048@1.png","type":"image/png","lastModified":1689788413615.35,"size":758910}] 29:{"id":"fc82909033f02daf","slug":null,"title":"Regl + CoordMask rebuild of PDX Map Tracer - stable, before worker tomfoolery","thumbnail":"c48060e70274e3e6da2929cf8721300a3acece30878bcb5b5d9bdd714d348a91","access_level":"public","create_time":"$D2023-07-19T17:40:13.615Z","update_time":"$D2023-07-19T17:40:29.469Z","view_time":null,"first_public_time":"$D2023-07-19T17:40:13.615Z","has_unpublished_edits":null,"fork":{"id":"d7420ad89050db20","slug":null,"title":"Regl + CoordMask rebuild of PDX Map Tracer","owner":{"id":"02d4ccf8951f2f02","login":"mheard03","name":""}},"stars":0,"starred":false,"owner":{"type":"team","id":"02d4ccf8951f2f02","login":"mheard03","name":"","avatar_url":"https://avatars-next.observableusercontent.com/ae42ada5dc924d7cd620a4ae3bb6279a3e82fb649668ee6c0729bdada1ebf016","tier":"starter_2024","bio":"","following":false},"version":7118,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"6afb6cac5f188ec0","login":"mheard03","name":"","avatar_url":"https://avatars-next.observableusercontent.com/ae42ada5dc924d7cd620a4ae3bb6279a3e82fb649668ee6c0729bdada1ebf016","tier":null,"bio":"","following":false}],"members":[{"type":"individual","id":"6afb6cac5f188ec0","login":"mheard03","name":"","avatar_url":"https://avatars-next.observableusercontent.com/ae42ada5dc924d7cd620a4ae3bb6279a3e82fb649668ee6c0729bdada1ebf016","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":1,"collection":null,"type":"notebook","body":{"titling":"auto","title":"Regl + CoordMask rebuild of PDX Map Tracer - stable, before worker tomfoolery","cells":[{"id":2720,"value":"# Regl + CoordMask rebuild of PDX Map Tracer - stable, before worker tomfoolery","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":2764,"value":"## Usage example\n\nExtracting all the states in South America from the Victoria 3 province map","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":2767,"value":"### Inputs\n\n**```image```**: The image to trace; can be any format accepted by [```regl.texture```](http://regl.party/api#constructor-2). No need to worry about GPU texture size limitations; images will automatically be split into tiles for processing.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":2761,"value":"sampleImage = {\n const img = await FileAttachment(\"worldMap2048@1.png\").image();\n img.style.width = (img.naturalWidth / devicePixelRatio) + \"px\";\n img.style.border = \"2px dotted #ff00ff\";\n return img;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4230,"value":"**```wrapX ```**: Boolean indicating whether the map represents the entire globe. Pick `true` for world maps (EU, Victoria), and `false` for regional maps (CK, Imperator).","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":2773,"value":"**```colorReplacementMap ```**: Lookup map of ColorMasks; ```inputColor => outputColor```\n\nSince you _probably_ don't need every individual province traced, a good performance enhancement is to consolidate the provinces before tracing. Any provinces whose input colors aren't present in ```colorReplacementMap``` will be discarded (this is handy for skipping the oceans).","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":2807,"value":"sampleColorReplacementMap = {\n // sampleColorReplacementMap is built from sampleColorReplacementValue to make the demo more legible.\n const reversed = sampleColorReplacementMapValues.map(m => {\n let [outputColor, inputColors] = m;\n outputColor = ColorMask.fromHex(outputColor);\n inputColors = inputColors.map(ic => ColorMask.fromHex(ic));\n return inputColors.map(ic => [ic, outputColor]);\n }).flat();\n return new Map(reversed);\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":2745,"value":"$49","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":2892,"value":"-----\n## Example\n\nExtracting all the states in South America from the Victoria 3 province map","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":3256,"value":"viewof sampleOptions = {\n function buildToggle(options) {\n const toggle = Inputs.toggle(options);\n toggle.style.setProperty('--label-width', 'auto');\n toggle.style.flexDirection = \"row-reverse\";\n toggle.style.justifyContent = \"flex-end\";\n return toggle;\n }\n \n return Inputs.form({\n undefined: html`Options`,\n colorReplacementMap: buildToggle({ label: \"Use colorReplacementMap\", value: true }),\n wrapX: buildToggle({ label: \"wrapX\", value: true })\n });\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3331,"value":"### Setup","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":4219,"value":"sampleWrapX = true","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3215,"value":"colorReplacementMap = sampleOptions.colorReplacementMap ? sampleColorReplacementMap : undefined;","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3229,"value":"sampleColorTable = colorReplacementMap ? buildColorTable(colorReplacementMap) : undefined;","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":2904,"value":"{\n if (!colorReplacementMap) {\n return md`No \\`colorTable\\` lookup texture was generated`;\n }\n const canvas = createCanvasElement(sampleColorTable);\n const scale = Math.floor(Math.min(width * devicePixelRatio / canvas.width, 400 * devicePixelRatio / canvas.height));\n canvas.style.width = canvas.width * scale + \"px\";\n canvas.style.border = \"2px dotted #ff00ff\";\n\n return md`The \\`colorTable\\` lookup texture (${canvas.width} x ${canvas.height})\n\n${canvas}`\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3746,"value":"viewof sampleTileSize = {\n const minSize = 128;\n const inputSize = Math.max(sampleImage.naturalWidth ?? sampleImage.width, sampleImage.naturalHeight ?? sampleImage.height);\n const inputSizeMax = 2 ** Math.ceil(Math.log2(inputSize));\n const maxSize = Math.min(inputSizeMax, GLHelper.maxTextureSize);\n\n const powerOf2Sizes = d3.range(Math.log2(minSize), Math.log2(maxSize) + 1).map(m => 2**m);\n \n const roundSizeBreakpoint = 1000 * ~~(Math.min(4096, maxSize) / 1000);\n const roundSizes = [\n 250, 500, 750,\n ...d3.range(1000, roundSizeBreakpoint , 500),\n ...d3.range(roundSizeBreakpoint, maxSize + 1, 1000) \n ].filter(s => s >= minSize && s <= maxSize);\n\n return Inputs.select([...powerOf2Sizes, ...roundSizes], { label: \"Tile size\", format: v => v + \"px\", value: Math.min(1024, maxSize) })\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3844,"value":"sampleTileSlicer = new TileSlicer(sampleImage, { wrapX: sampleWrapX, maxTileSize: sampleTileSize });","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3852,"value":"{\n if (sampleTileSlicer.tileCount == 1) {\n return md`Image will be processed as a single tile.`;\n }\n else {\n return md`Image will be sliced into an ${sampleTileSlicer.tileCounts[0]}x${sampleTileSlicer.tileCounts[1]} grid of ${sampleTileSlicer.tileCount} tiles.`\n }\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3334,"value":"### GPU processing (single tile)","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":3801,"value":"viewof sampleTileRect = {\n const tile0Dims = _.pick(sampleTileSlicer.getTileRect(0,0).unpadded, [\"width\", \"height\"]);\n const rects = sampleTileSlicer.getTileRects();\n rects.forEach(r => r.index = [r.x / sampleTileSize, r.y / sampleTileSize]);\n \n const format = (rect, i) => {\n let obj = Object.assign({ }, rect.unpadded);\n const dims = _.pick(obj, [\"width\", \"height\"]);\n if (i == 0 || !_.isEqual(tile0Dims, dims)) obj.size = `${dims.width}x${dims.height}`;\n \n obj = _.pick(obj, [\"index\", \"x\", \"y\", \"size\"]);\n return JSON.stringify(obj)\n .replaceAll(/([\\:\\{\\,])/g, \"$1 \")\n .replaceAll(/[\\{\\}\\\"]/gi, \"\")\n .trim();\n };\n \n return Inputs.select(rects, { label: \"Select a tile\", format, disabled: sampleTileSlicer.tileCount <= 1 });\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3338,"value":"viewof gpuOutputLayer = Inputs.radio([\"sampleTile\", \"color\", \"neighbors\", \"coords\"], { label: \"Select a layer:\", value: \"color\" })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3341,"value":"$4a","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3968,"value":"sampleTile = await sampleTileSlicer.getTileBitmap(sampleTileRect);","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5875,"value":"sampleReglProgram = getReglProgram(sampleTileSlicer.baseTileSize, sampleColorTable);","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3966,"value":"sampleTileGpuResult = gpuProcessTile(sampleTile, sampleTileRect, sampleReglProgram, { wrapX: sampleWrapX });","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4112,"value":"sampleTilePixelVectors = extractPixelVectors(sampleTileGpuResult);","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":6498,"value":"sampleTileCoordClasses = extractCoordClasses(sampleTileGpuResult);","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5570,"value":"sampleTileTraceResult = {\n const coordClasses = await extractCoordClasses(sampleTileGpuResult);\n const polygonRings = await pixelVectorsToRings(sampleTilePixelVectors, coordClasses, [sampleTileSlicer.imageWidth, sampleTileSlicer.imageHeight])\n return { polygonRings, coordClasses }\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4837,"value":"### GPU processing, image tracing, and topology construction (entire image)","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":4123,"value":"sampleTraceResult = {\n const options = {\n colorTable: sampleColorTable,\n wrapX: sampleOptions.wrapX,\n maxTileSize: sampleTileSize,\n fnOnTileProcessed: li.onTileProcessed\n }\n return await gpuProcessImage(sampleImage, options);\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":6859,"value":"mapGeoExtent = [-180, 75, 180, -65];","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":7082,"value":"proj = getMapGeoProjection(d3.geoMiller, [sampleImage.naturalWidth, sampleImage.naturalHeight], mapGeoExtent)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":6846,"value":"$4b","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4786,"value":"sampleTopology = await buildTopology(sampleTraceResult, { projection: proj })","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4895,"value":"sampleGeoJson = topojson.feature(sampleTopology, sampleTopology.objects.traced)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":2873,"value":"----\n## Logic","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":5120,"value":"### Definitions and setup","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":2878,"value":"function buildColorTable(colorReplacementMap) {\n // Build column data\n const columns = [...new Array(256)].map(() => []);\n for (let [inputColor, outputColor] of colorReplacementMap.entries()) {\n const redValue = ColorMask.toArray(inputColor)[0];\n columns[redValue].push([inputColor, outputColor]);\n }\n\n // Build the pixelIO\n const textureWidth = 512;\n const textureHeight = 1 + _.max(columns.map(c => c.length));\n const pixelIO = new PixelIO(textureWidth, textureHeight);\n \n // Draw the pixels\n for (let colNum = 0; colNum < 256; colNum++) {\n const x = colNum * 2;\n const column = columns[colNum];\n for (let y = 0; y < column.length; y++) {\n const [inputColor, outputColor] = column[y];\n pixelIO.setColorNum(x, y, inputColor);\n pixelIO.setColorNum(x+1, y, outputColor);\n }\n }\n\n const canvas = new OffscreenCanvas(textureWidth, textureHeight);\n pixelIO.drawTo(canvas);\n return canvas.transferToImageBitmap();\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":1389,"value":"$4c","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4373,"value":"coordEncodings = {\n const values = {\n junction: 32,\n intrusion: 64,\n corner: 128\n };\n\n const reverse = [];\n Object.entries(values).forEach(([key, value]) => reverse[value] = key);\n\n function decode(value) {\n return reverse[value];\n }\n\n return { values, decode };\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5230,"value":"#### Definitions and setup: regl","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":5708,"value":"function getReglProgram(baseTileSize, colorTable) {\n const canvas = new OffscreenCanvas(baseTileSize, baseTileSize);\n const gl = canvas.getContext(\"webgl2\", { \n alpha: true,\n antialias: false, \n depth: false,\n stencil: false,\n failIfMajorPerformanceCaveat: false,\n powerPreference: \"high-performance\",\n preserveDrawingBuffer: true\n });\n \n const regl = createREGL({ gl });\n \n const commands = {\n replaceColors: getReplaceColorsCommand(regl, colorTable),\n findNeighbors: getFindNeighborsCommand(regl),\n classifyCoords: getClassifyCoordsCommand(regl)\n };\n\n function destroy() {\n canvas.width = 0;\n canvas.height = 0;\n regl.destroy();\n }\n\n return { \n regl,\n destroy,\n commands\n };\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":980,"value":"reglCommandDefaults = ({\n attributes: {\n position: [ [-1,-1],[1,-1],[-1,1],[-1,1],[1,-1],[1,1] ]\n },\n depth: { enable: false },\n count: 6,\n vert: vertexShader\n});","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3015,"value":"function getReplaceColorsCommand(regl, colorTable) {\n let command;\n if (colorTable) {\n command = {\n frag: replaceColorFragShader,\n uniforms: {\n uSampler: regl.prop(\"uSampler\"),\n colorTable: regl.texture({ data: colorTable }),\n ctResolution: [colorTable.width, colorTable.height]\n },\n framebuffer: regl.prop(\"framebuffer\")\n };\n }\n else {\n command = {\n frag: passThruFragShader,\n uniforms: { uSampler: regl.prop(\"uSampler\") },\n framebuffer: regl.prop(\"framebuffer\")\n };\n }\n return regl(Object.assign({}, reglCommandDefaults, command));\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3131,"value":"function getFindNeighborsCommand(regl) {\n let command = {\n frag: findNeighborsFragShader,\n uniforms: {\n uSampler: regl.prop(\"uSampler\")\n },\n framebuffer: regl.prop(\"framebuffer\")\n };\n return regl(Object.assign({}, reglCommandDefaults, command));\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4359,"value":"function getClassifyCoordsCommand(regl) {\n let command = {\n frag: classifyCoordsFragShader,\n uniforms: {\n uSampler: regl.prop(\"uSampler\")\n },\n framebuffer: regl.prop(\"framebuffer\")\n };\n return regl(Object.assign({}, reglCommandDefaults, command));\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5250,"value":"Shader source code is available below","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":5235,"value":"### GPU processing","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":3998,"value":"$4d","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5889,"value":"$4e","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":6528,"value":"$4f","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":6152,"value":"$50","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4735,"value":"async function extractCoordClasses(gpuOutput) {\n const { coordsIO, offset } = gpuOutput;\n const tileCoords = new MaskMap(CoordMask);\n\n const { width, height } = coordsIO;\n let counter = 0;\n for (let { colorNum, x: tileX, y: tileY } of coordsIO.getNonZeroPixels()) {\n const x = tileX + offset[0];\n const y = tileY + offset[1];\n\n const coordType = coordEncodings.decode(ColorMask.toArray(colorNum)[0]);\n /*\n if (!coordType) {\n console.log({ error: \"wyd\", tileX, tileY, coordsIO, x, y, colorNum, color: ColorMask.toArray(colorNum)})\n throw \"wyd\";\n }\n if (tileCoords.has([x,y])) throw \"but wyd\";\n */\n tileCoords.set([x,y], coordType);\n if (counter++ % 5000 == 0) await pauseIfNeeded();\n }\n return tileCoords;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5243,"value":"### Image tracing and topology construction","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":4780,"value":"$51","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4873,"value":"$52","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5267,"value":"async function buildGeoJsonRaw(traceResult) {\n const features = [];\n for (let [colorNum, ringCoords] of traceResult.polygonRings) {\n const geometry = buildGeoJsonForPolygon(ringCoords);\n features.push(turf.feature(buildGeoJsonForPolygon(ringCoords), { colorNum }))\n await pauseIfNeeded();\n }\n return {\n type: \"FeatureCollection\",\n features\n }\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5260,"value":"$53","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5294,"value":"$54","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5484,"value":"function scaleTopology(topology, factor) {\n const coords = new Set(topology.arcs.flat());\n if (!factor) {\n const fractions = [...new Set([...coords].flat().map(t => t % 1 || 1))];\n factor = d3.range(1, 13).find(v => fractions.every(f => (v*f) % 1 < 0.0001));\n }\n if (!factor) throw \"Couldn't find a good upscale factor\";\n for (let coord of coords) {\n coord[0] *= factor;\n coord[1] *= factor;\n }\n for (let i = 0; i < 4; i++) {\n topology.bbox[i] *= factor;\n }\n return topology;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":6091,"value":"-----\n## Loading indicator","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":6109,"value":"$55","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":6126,"value":"li = new LoadIndicator(sampleImage);","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":6128,"value":"li.canvas","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":6094,"value":"$56","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5124,"value":"----\n## Utilities and helpers","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":5155,"value":"#### Numeric encoders & collections","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":1524,"value":"$57","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3607,"value":"XydMask = {\n // Fork of http://defghi1977.html.xdomain.jp/tech/dotrace/dotrace.htm\n // 25-bit X, 25-bit Y, 2-bit D (sized to fit inside Number.MAX_SAFE_INTEGER, 2**53)\n const two27 = 2**27;\n const xFactor = 2**27;\n const yMask = 2**27 - 1 - 3; \n const yShift = 2;\n const dMask = 0x3\n\n const direcs = { e: 0, s: 1, w: 2, n: 3 };\n \n function fromArray([x, y, d]) {\n const xShifted = x * xFactor\n return xShifted + (y << yShift | d);\n }\n function toArray(number) {\n return [\n ~~(number / xFactor), \n (number & yMask) >>> yShift, \n number & dMask\n ];\n }\n\n function fromObject(xyd) {\n const d = isNaN(xyd.d) ? direcs[d] : xyd.d;\n return fromArray([xyd.x, xyd.y, d]);\n }\n function toObject(number) {\n const array = toArray(number);\n return { x: array[0], y: array[1], d: array[2] };\n }\n\n return {\n direcs,\n toArray, fromArray,\n fromObject, toObject\n }\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":1717,"value":"CoordMask = {\n // 0x4000000 = 2**26 = half the bits of (Number.MAX_SAFE_INTEGER - 1)\n const xMask = 0x4000000;\n const yMask = 0x4000000;\n\n function fromArray([x, y]) {\n return x * xMask + y;\n }\n function toArray(number) {\n const x = number / xMask;\n const y = number % yMask; \n return [~~x, ~~y];\n }\n \n function fromObject(xy) {\n return fromArray([xy.x, xy.y]);\n }\n function toObject(number) {\n const array = toArray(number);\n return { x: array[0], y: array[1] };\n }\n \n return {\n fromArray, fromObject,\n toArray, fromArray\n }\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":2483,"value":"$58","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":2353,"value":"$59","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":2447,"value":"// Jiggery-pokery for Observable\nfunction wrapIterator(tag, iterator, fnGetValue) {\n if (fnGetValue) {\n return {\n get [Symbol.toStringTag]() {\n return tag;\n },\n next() {\n const next = iterator.next();\n if (next.value) next.value = fnGetValue(next.value);\n return next;\n },\n *[Symbol.iterator]() {\n for (let entry of iterator) {\n yield fnGetValue(entry);\n }\n }\n }\n }\n else {\n return {\n get [Symbol.toStringTag]() {\n return tag;\n },\n next() {\n return iterator.next();\n },\n *[Symbol.iterator]() {\n yield* iterator;\n }\n }\n } \n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5173,"value":"#### Image manipulation","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":1546,"value":"$5a","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":1257,"value":"function createCanvasElement(imageSource) { \n const width = imageSource.naturalWidth ?? imageSource.width;\n const height = imageSource.naturalHeight ?? imageSource.height;\n\n const canvas = DOM.canvas(width, height);\n \n if (imageSource instanceof PixelIO) {\n imageSource.drawTo(canvas);\n }\n else {\n const ctx = canvas.getContext(\"2d\");\n ctx.drawImage(imageSource, 0, 0);\n } \n\n canvas.style.width = canvas.width * devicePixelRatio;\n canvas.style.maxWidth = \"100%\";\n canvas.style.imageRendering = \"pixelated\";\n return canvas;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3534,"value":"function createBitmap(imageSource) { \n if (imageSource instanceof ImageBitmap) {\n return imageSource;\n }\n if (imageSource instanceof OffscreenCanvas) {\n return imageSource.transferToImageBitmap();\n }\n if (imageSource instanceof PixelIO) {\n return imageSource.drawToBitmap();\n }\n \n const width = imageSource.naturalWidth ?? imageSource.width;\n const height = imageSource.naturalHeight ?? imageSource.height;\n const canvas = new OffscreenCanvas(width, height);\n const ctx = canvas.getContext(\"2d\");\n ctx.drawImage(imageSource, 0, 0);\n return canvas.transferToImageBitmap();\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3413,"value":"$5b","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3410,"value":"$5c","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5178,"value":"#### Misc","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":3408,"value":"class GLHelper {\n static {\n const canvas = new OffscreenCanvas(1, 1);\n const gl = canvas.getContext('webgl2');\n\n const constrainingValues = [\n gl.getParameter(gl.MAX_TEXTURE_SIZE),\n gl.getParameter(gl.MAX_RENDERBUFFER_SIZE),\n ...gl.getParameter(gl.MAX_VIEWPORT_DIMS)\n ];\n const safeValue = 2**Math.floor(Math.log2(Math.min(...constrainingValues) - 1));\n GLHelper.maxTextureSize = Math.min(8192, safeValue);\n GLHelper.destroyContext(gl);\n }\n\n static destroyContext(gl) {\n if (!gl) return;\n if (!gl.isContextLost) {\n gl.getExtension('WEBGL_lose_context').loseContext();\n }\n if (gl.canvas) {\n gl.canvas.width = 1;\n gl.canvas.height = 1;\n }\n }\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4875,"value":"$5d","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4819,"value":"pauseIfNeeded = {\n const pauseIncrement = 1000/15;\n let lastPause = performance.now();\n\n async function pauseIfNeeded(_pauseIncrement) {\n _pauseIncrement ??= pauseIncrement;\n if (lastPause + _pauseIncrement < performance.now()) {\n await new Promise(r => requestAnimationFrame(r));\n lastPause = performance.now();\n }\n }\n\n return pauseIfNeeded;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3044,"value":"----\n## Shader source","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":3165,"value":"viewof vertexShader = highlightGlsl.vertex(`#version 300 es\nprecision highp float;\n// vertexShader\n\nin vec2 position;\nvoid main () {\n gl_Position = vec4(position, 0, 1.0);\n}`);","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3195,"value":"viewof passThruFragShader = highlightGlsl.fragment(`#version 300 es\nprecision highp float;\n// passThruFragShader\n\nuniform sampler2D uSampler;\n\nout vec4 fragColor;\nvoid main () {\n ivec2 xy = ivec2(round(gl_FragCoord.xy - 0.5));\n fragColor = texelFetch(uSampler, xy, 0);\n}`)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3017,"value":"viewof replaceColorFragShader = highlightGlsl.fragment(`#version 300 es\nprecision highp float;\n// replaceColorFragShader\n\nuniform sampler2D uSampler;\nuniform sampler2D colorTable;\nuniform vec2 ctResolution;\n\nout vec4 fragColor;\nvoid main () {\n ivec2 xy = ivec2(round(gl_FragCoord.xy - 0.5));\n vec4 inputColor = texelFetch(uSampler, xy, 0);\n fragColor = vec4(0);\n\n int columnNumber = int(round(inputColor.r * 255.0));\n int x = 2 * columnNumber;\n\n for (int y = 0; y < int(ctResolution.y); y++) {\n vec4 candidate = texelFetch(colorTable, ivec2(x, y), 0);\n if (candidate == inputColor) {\n fragColor = texelFetch(colorTable, ivec2(x+1, y), 0);\n return;\n }\n }\n}`);","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3020,"value":"$5e","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4354,"value":"$5f","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4851,"value":"----\n\n## Imports","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":6834,"value":"d3 = {\n const d3 = require(\"d3\");\n const d3geo = require(\"d3-geo\");\n const d3geoProj = require(\"d3-geo-projection\");\n return Object.assign(await d3, await d3geo, await d3geoProj);\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4856,"value":"topojson = require(\"topojson-client\", \"topojson-simplify\", \"topojson-server\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5428,"value":"turf = await require('@turf/turf@6.5.0/turf.min.js')","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":590,"value":"createREGL = require('regl@2.1.0/dist/regl.js')","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4860,"value":"### Imports: JSTS (polygon manipulation and GeoJSON creation)","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":4853,"value":"jsts = {\n const jsts = await require('jsts@2.9.3/dist/jsts.min.js');\n \n const result = { \n ...jsts.geom,\n Orientation: jsts.algorithm.Orientation,\n DistanceOp: jsts.operation.distance.DistanceOp,\n ConvexHull: jsts.algorithm.ConvexHull,\n Simplifier: jsts.simplify.DouglasPeuckerSimplifier, \n GeoJSONWriter: jsts.io.GeoJSONWriter,\n GeoJSONReader: jsts.io.GeoJSONReader \n };\n delete result.util;\n return result;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4862,"value":"jstsFactory = new jsts.GeometryFactory(new jsts.PrecisionModel(4), -1); // round to nearest 0.25, SRID -1","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4864,"value":"jstsWriter = new jsts.GeoJSONWriter(jstsFactory);","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4866,"value":"jstsReader = new jsts.GeoJSONReader(jstsFactory);","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5217,"value":"### Imports: GLSL syntax highlighting","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":3023,"value":"import { highlight as highlightBase } from \"@juang1744/glsl-code-highlighting\";","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3027,"value":"highlightGlsl = {\n const output = new OffscreenCanvas(1, 1);\n const gl = output.getContext(\"webgl2\");\n \n function vertex(shader) {\n return highlightBase.vertexShader(gl, shader);\n }\n function fragment(shader) {\n return highlightBase.fragmentShader(gl, shader);\n }\n return { vertex, fragment };\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W60","stdlib":"1"}} 24:null