29:null 2a:["$","title",null,{"children":"Flights during COVID-19 pandemic | lounjukk | Observable"}] 2f:T65d,canvas = { const canvas = context.canvas; canvas.style.width = `${width}px`; canvas.style.height = `${height}px`; mapImageBuffer.use(() => { regl.clear({ color: colorToVector(landColor), depth: 1 }); mapCommand({ ...landMassBuffers, color: colorToVector(d3.color(backgroundColor).brighter(1)), }); }); while (true) { camera((state) => { //if (!state.dirty) return; /* drawRoutes({ ...routeLines, width: 3, color: colorToVector('rgba(1, 1, 1, 1)') }); */ regl.clear({ color: colorToVector('black'), depth: 1 }); projectedMapCommand({ ...backgroundMesh, color: colorToVector('steelblue'), altitude: -1e-3, texture: mapImageBuffer.color[0], projectionTransition }); drawPoints({ currentTime: mutable mutableCurrentTime, flights: flightData.flights, maxDistance: flightDistance, types: flightData.types, count: flightData.count, size: Math.min(1 / width * 6500, 6.5), showTypes: new Uint8Array(4) .fill(0) .map((_, i) => { const { value } = routeTypes.find(({value}) => value === i) || {}; if (typeof value === 'number') { return Number(selectedRouteTypes.indexOf(value.toString()) >= 0); } return 0; }), altitude: 0.0, timeToTaxi, blurPoint, projectionTransition }); }); yield canvas; await Promises.tick(1000/60); } }30:T608,continents = routes .reduce((arr, { type, from: fromAirport, to: toAirport, flights }, index) => { // Africa intercontinental first day = 3+6+197+176+36 = 418 const routeFlights = flightData.flightsOnRoute[index]; const create = (id, key) => { let flights = { inter: new Uint32Array(routeFlights.length).fill(0), trans: new Uint32Array(routeFlights.length).fill(0) }; flights[key] = new Uint32Array([...routeFlights]); return { id, ...flights }; }; const appendTo = (data, key) => { data[key] = routeFlights.reduce((flights, value, i) => { flights[i] = flights[i] + value; return flights; }, data[key]); }; const from = nameToKey(airports[fromAirport].continent); const to = nameToKey(airports[toAirport].continent); const dataFrom = arr.find(d => d.id === from); if (dataFrom) { appendTo(dataFrom, type === 3 ? 'inter' : 'trans'); } else { arr.push(create(from, type === 3 ? 'inter' : 'trans')); } if (type === 3) { const dataTo = arr.find(d => d.id === to); if (dataTo) { appendTo(dataTo, 'inter'); } else { arr.push(create(to, 'inter')); } } return arr; }, []) .sort((a, b) => { if (a.id < b.id) { return -1; } else if (a.id > b.id) { return 1; } return 0; }) .map(({ inter, trans, ...d }) => ({ inter, trans, interMax: Math.max(...inter), transMax: Math.max(...trans), ...d }))31:T652,continentChordData = { const idToName = id => id .toLowerCase() .split('_') .map(sub => sub.replace(/^[a-z]/, c => c.toUpperCase())) .join(' '); const indexByName = new Map(); const nameByIndex = new Map(); let n = 0; let len = 0; continentConnections.forEach(({ from, to, flights }) => { if (!indexByName.has(from)) { nameByIndex.set(n, from); indexByName.set(from, n++); } if (!indexByName.has(to)) { nameByIndex.set(n, to); indexByName.set(to, n++); } len = Math.max(len, Object.keys(flights).length || 0); }); const baseMatrix = new Array(n) .fill(0) .map(() => new Array(n).fill(0)); const valuesMatrix = new Array(n) .fill(0) .map(() => new Array(n).fill(0).map(() => new Array(len).fill(0)) ); // Construct a square matrix counting package imports. continentConnections.forEach(({ from, to, max, flights }) => { const source = indexByName.get(from); const destination = indexByName.get(to); baseMatrix[source][destination] = max; baseMatrix[destination][source] = max; Object.keys(flights).forEach(key => { valuesMatrix[source][destination][key] = flights[key]; valuesMatrix[destination][source][key] = flights[key] }); }); const groups = [...nameByIndex.keys()] .map(index => { const id = nameByIndex.get(index); return { index, id, color: d3.schemeTableau10[index + 3], title: idToName(id) }; }); return { baseMatrix, valuesMatrix, groups, length: len }; }32:T511,drawPoints = regl({ primitive: 'points', depth: { enable: true }, stencil: { enable: true }, frag: pointsFrag, vert: pointsVert, attributes: { aPoints: { buffer: regl.prop('flights'), stride: 6 * 4, offset: 0 }, aTimes: { buffer: regl.prop('flights'), stride: 6 * 4, offset: 4 * 4 }, aType: regl.prop('types') }, uniforms: { uMaxDistance: regl.prop('maxDistance'), uSize: regl.prop('size'), uTexture: regl.prop('blurPoint'), uCurrentTime: regl.prop('currentTime'), uWaitTime: regl.prop('timeToTaxi'), uShowTypes: regl.prop('showTypes'), uAltitude: regl.prop('altitude'), uProjectionTransition: regl.prop('projectionTransition'), 'uColors[0]': colorToVector(colors[0]), 'uColors[1]': colorToVector(colors[1]), 'uColors[2]': colorToVector(colors[2]), 'uColors[3]': colorToVector(colors[3]) }, blend: { enable: true, func: { srcRGB: 'one', srcAlpha: 1, dstRGB: 'one', dstAlpha: 1 }, }, /* uniforms: { u_scale: regl.prop('scale'), u_angle: regl.prop('angle'), u_translate: regl.prop('translate'), u_rotate: regl.prop('rotate'), u_size: regl.prop('size'), }, */ count: regl.prop('count'), })33:Te8d,pointsVert = ` precision highp float; attribute vec4 aPoints; attribute vec2 aTimes; attribute float aType; uniform ivec4 uShowTypes; uniform float uCurrentTime; uniform float uSize; uniform float uWaitTime; uniform vec4 uColors[4]; uniform float uMaxDistance; uniform float uAltitude; uniform mat4 uProjectionView; uniform vec3 uProjectionTransition; varying vec4 vColor; ${requireGLSL([ 'intermediatePointOnChord', 'distanceBetween', ...projectionOptions.map(({ value, projection }) => [projection, 'proj' + value].join(':')) ])} vec4 project(vec2 coords, float altitude, highp int projection) { ${ projectionOptions .map(({ value, projection }) => ' if (projection == ' + value + ') return proj' + value + '(coords, altitude);').join('\n') } } // https://github.com/glslify/glsl-easings float cubicOut(float t) { float f = t - 1.0; return f * f * f + 1.0; } float cubicIn(float t) { return t * t * t; } float linearInterpolate(float from, float to, float t) { return(from * (1.0 - t) + to * t); } void main(void) { vColor = uColors[int(aType)]; float maxAltitude = uAltitude; float timeToReachMaxAltitude = 1.0; float altitude = uAltitude; float embark = aTimes[0]; float disembark = aTimes[1]; vec2 fromLatLon = vec2(aPoints[0], aPoints[1]); vec2 toLatLon = vec2(aPoints[2], aPoints[3]); float dist = distanceBetween(fromLatLon, toLatLon) / 1000.0; int type = int(aType); bool shown = uShowTypes[type] == 1 && dist <= uMaxDistance; if (shown && embark - uWaitTime <= uCurrentTime && disembark + uWaitTime >= uCurrentTime && vColor.a > 0.0) { if (type == 1) { maxAltitude = uAltitude + 0.015; } else if (type == 2) { maxAltitude = uAltitude + 0.03; } else if (type == 3) { maxAltitude = uAltitude + 0.045; } vec2 pos = vec2(0, 0); if (embark > uCurrentTime) { pos = fromLatLon; } else if (disembark < uCurrentTime) { pos = toLatLon; } else { float timeTravelled = uCurrentTime - embark; float travelTime = disembark - embark; float timeToDestination = travelTime - timeTravelled; bool ascending = timeTravelled < timeToReachMaxAltitude; bool descending = timeToDestination < timeToReachMaxAltitude; if (ascending && descending) { ascending = false; descending = false; if (timeTravelled < timeToDestination) { ascending = true; } else { descending = true; } } if (ascending) { float t = cubicOut(timeTravelled / timeToReachMaxAltitude); altitude = linearInterpolate(uAltitude, maxAltitude, t); } else if (descending) { float t = cubicIn(1.0 - (timeToDestination / timeToReachMaxAltitude)); altitude = linearInterpolate(maxAltitude, uAltitude, t); } else { altitude = maxAltitude; } float relative = timeTravelled / travelTime; pos = intermediatePointOnChord(fromLatLon, toLatLon, relative); } gl_PointSize = uSize; highp int fromProjection = int(uProjectionTransition[0]); highp int toProjection = int(uProjectionTransition[1]); float t = uProjectionTransition[2]; vec2 position = vec2(pos[1], pos[0]); vec4 fromPosition = project(vec2(position), altitude + 0.0, fromProjection); vec4 toPosition = project(vec2(position), altitude + 0.0, toProjection); gl_Position = uProjectionView * vec4( linearInterpolate(fromPosition.x, toPosition.x, t), linearInterpolate(fromPosition.y, toPosition.y, t), linearInterpolate(fromPosition.z, toPosition.z, t), toPosition[3] ); } else { // Don't show non active gl_Position = vec4(0, 0, 0, 0); } } `34:Tb4b,flightData = { if (this && this.dataLoaded === 1) { yield this; } else { const totalFlightCount = flightsRaw.reduce((t, { flights }) => t + flights, 0); let dayOfYear = (day) => { const now = new Date(day); const start = new Date(now.getFullYear(), 0, 0); const diff = now - start; const oneDay = 1000 * 60 * 60 * 24; return Math.floor(diff / oneDay); } const dateRange = [ (dayOfYear(flightsRaw[0].dates[0]) - 1), dayOfYear(flightsRaw[flightsRaw.length - 1].dates[1]) - 1 ]; let currentDataChunk = 0; let count = 0; while (!routes.length) { yield { dateRange, dataLoaded: 0 } } const flightsArr = new Array(totalFlightCount).fill(new Float32Array([0, 0, 0, 0, 0, 0])); const typeArr = new Uint8Array(totalFlightCount).fill(0); const flightsOnRoute = new Array(routes.length) .fill(0) .map(d => new Uint32Array(dateRange[1] - dateRange[0]).fill(0)); let flights = regl.buffer({ data: flightsArr }); let types = regl.buffer({ data: typeArr }); const addFlights = flights => { for (let i = 0; i < flights.length; i++) { const flight = flights[i]; const route = routes[flight.route]; if (route) { const reversed = !!parseFloat(flight.reversed); const disembark = parseFloat(flight.disembark); const day = Math.floor(disembark / 24); const coords1 = route.coords[0]; const coords2 = route.coords[1]; const from = reversed ? coords2 : coords1; const to = reversed ? coords1 : coords2; flightsOnRoute[flight.route][day] = flightsOnRoute[flight.route][day] + 1; flightsArr[count] = new Float32Array([ ...from, ...to, disembark - route.time, disembark ]); typeArr[count] = route.type; count++ } } }; yield { dateRange, count, flightsOnRoute, flights, types, dataLoaded: 0 }; while (currentDataChunk < flightsRaw.length) { await unzipCSV(flightsRaw[currentDataChunk].promise).then(addFlights); flights = flights({ data: flightsArr }); types = types({ data: typeArr }); currentDataChunk++; yield { dateRange, count, flightsOnRoute, flights, types, dataLoaded: currentDataChunk / flightsRaw.length }; if (currentDataChunk === 1) { // Give initial draw yield { dateRange, count, flightsOnRoute, flights, types, dataLoaded: currentDataChunk / flightsRaw.length, firstRender: true }; await Promises.delay(50); } await Promises.delay(1); } } };35:T9fc,flightsRaw = [ { flights: 112868, dates: ['2020-01-01', '2020-01-05'], promise: FileAttachment("flights_week_1.csv@4.gz") }, { flights: 167933, dates: ['2020-01-06', '2020-01-12'], promise: FileAttachment("flights_week_2.csv@2.gz") }, { flights: 157540, dates: ['2020-01-13', '2020-01-19'], promise: FileAttachment("flights_week_3.csv@2.gz") }, { flights: 158304, dates: ['2020-01-20', '2020-01-26'], promise: FileAttachment("flights_week_4.csv@2.gz") }, { flights: 164572, dates: ['2020-01-27', '2020-02-02'], promise: FileAttachment("flights_week_5.csv@1.gz") }, { flights: 167767, dates: ['2020-02-03', '2020-02-09'], promise: FileAttachment("flights_week_6.csv@1.gz") }, { flights: 166788, dates: ['2020-02-10', '2020-02-16'], promise: FileAttachment("flights_week_7.csv@1.gz") }, { flights: 173785, dates: ['2020-02-17', '2020-02-23'], promise: FileAttachment("flights_week_8.csv@1.gz") }, { flights: 173482, dates: ['2020-03-24', '2020-03-01'], promise: FileAttachment("flights_week_9.csv.gz") }, { flights: 164615, dates: ['2020-03-02', '2020-03-08'], promise: FileAttachment("flights_week_10.csv.gz") }, { flights: 157804, dates: ['2020-03-08', '2020-03-15'], promise: FileAttachment("flights_week_11.csv.gz") }, { flights: 119096, dates: ['2020-03-16', '2020-03-22'], promise: FileAttachment("flights_week_12.csv.gz") }, { flights: 67047, dates: ['2020-03-23', '2020-03-29'], promise: FileAttachment("flights_week_13.csv.gz") }, { flights: 47514, 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