31:Tb2c,map = { const circle = d3.geoCircle(), svg = d3 .create("svg") .attr("width", width) .attr("height", height); var center = projection([0, 0]); const path = d3.geoPath().projection(projection); const topg = svg.append("g").attr("class", "topg"); topg .selectAll("path") .data(land.features) .enter() .append("path") .attr("d", path) .attr("fill", "none") .attr("stroke", "#999") .attr("stroke-width", "0.5px"); let hexes; let first_pass = true; const zoom = d3 .zoom() .scaleExtent([1, 32]) .on('zoom', () => { // called on onzoom event const { transform } = d3.event; let bounds = topg.node().getBoundingClientRect(); // console.log(bounds); first_pass = false; // map lines also get thinner as we zoom in topg.selectAll("path").attr("stroke-width", .5 / transform.k); topg.attr('transform', transform); let hexbin = d3 .hexbin() .extent([[0, 0], [width, height]]) .radius(1.5 / transform.k) .x(d => d.loc.coordinates[1]) .y(d => d.loc.coordinates[0]); let min_rtts_with_geo_hex = Object.assign( hexbin(cities) .map(d => ((d.population = d3.sum(d, d => d.population)), d)) .sort((a, b) => b.cityId - a.cityId), { title: "Population" } ); hexes.selectAll("path").remove(); hexes .selectAll("path") .data( min_rtts_with_geo_hex.filter(hex => { let [x, y] = projection([hex.y, hex.x]); return true; //x > (-bounds.left + bounds.width / 2) / transform.k; }) ) .join("path") .attr("transform", d => { let [x, y] = projection([d.y, d.x]); return `translate(${x},${y})`; }) .attr("d", d => hexbin.hexagon(2 / transform.k)) .attr("fill", d => color(d.population)) .attr("stroke", d => d3.lab(color(d.population)).darker()) .attr("stroke-width", .5 / transform.k) .on("mouseover", d => { mutable hover = d.population; }) .on("mouseout", () => { mutable hover = null; }) .append("title") .text( d => `${d.length.toLocaleString()} urbanized areas within this hexbin` ); }); hexes = topg.append("g"); svg.call(zoom); // by this point we've got all of our drawing // definitions inside the 'zoom' callback, so // we need to fake a 0-factor zoom event to // get things painted for the first time svg.transition().call(zoom.scaleBy, 0); // return svg.node(); return Object.assign(svg.node(), { zoomIn: () => svg.transition().call(zoom.scaleBy, 2), zoomOut: () => svg.transition().call(zoom.scaleBy, 0.5) // zoomRandom: random, // zoomReset: reset }); }32:[] 2f:{"title":"World population","cells":[{"id":0,"value":"md`# World population`","pinned":false,"hidden":false,"mode":"ojs"},{"id":1745,"value":"md`${\n hover\n ? 'Population on this hexbin: ' + `${(hover / 1e6).toFixed(1)}M` + '.'\n : 'Try hovering on the map...'\n}\n`","pinned":false,"hidden":false,"mode":"ojs"},{"id":1724,"value":"swatches(a.quantz.reverse())","pinned":false,"hidden":false,"mode":"ojs"},{"id":2889,"value":"{\n const form = html``;\n form.in.onclick = () => map.zoomIn();\n form.out.onclick = () => map.zoomOut();\n // form.random.onclick = () => map.zoomRandom();\n // form.reset.onclick = () => map.zoomReset();\n return form;\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":2690,"value":"$31","pinned":false,"hidden":false,"mode":"ojs"},{"id":695,"value":"md`\n\nend of notebook\n\n---\n\n## Aux. functions supporting this notebook:\n`","pinned":false,"hidden":false,"mode":"ojs"},{"id":2155,"value":"color = d3.scaleSequential(\n d3.extent(cities, d => d.population),\n d3.interpolateYlOrBr\n)","pinned":false,"hidden":false,"mode":"ojs"},{"id":1741,"value":"mutable hover = 0","pinned":false,"hidden":false,"mode":"ojs"},{"id":805,"value":"width = 954","pinned":false,"hidden":false,"mode":"ojs"},{"id":1326,"value":"height = Math.ceil((width * screen.height) / screen.width) // screen.height //width * (9 / 16)","pinned":false,"hidden":false,"mode":"ojs"},{"id":394,"value":"// colorScale = d3\n// .scaleOrdinal()\n// .domain(a.density_thresholds)\n// // .range(a.quantz.slice(-23))\n// .range(a.quantz)\ncolorScale = a.colorScale","pinned":false,"hidden":false,"mode":"ojs"},{"id":81,"value":"a = {\n let colors = [\"#ffffd4\", \"#fe9929\", \"#8c2d04\"];\n\n let density_thresholds = d3.range(0, 1, .1);\n let linearColorScale = d3\n .scaleLinear()\n .domain(d3.range(0, 1, 1 / colors.length))\n .range(colors);\n\n let quantz = d3.quantize(linearColorScale, density_thresholds.length + 1);\n return {\n quantz: quantz,\n density_thresholds: density_thresholds,\n colorScale: linearColorScale\n // contours: contours,\n // contour_data: contour_data,\n // gridPoints: gridPoints\n };\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":6,"value":"projection = {\n return (\n d3\n // .geoOrthographic()\n // .geoMercator()\n .geoEqualEarth()\n .scale(200)\n .translate([width / 2, height / 2]) // w, h\n // .precision(20)\n );\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":2,"value":"d3 = require(\"d3@5\", \"d3-geo-projection@2\", \"d3-geo-polygon@1\", \"d3-array@^2.1\", \"d3-geo\", \"d3-hexbin@0.2\")","pinned":false,"hidden":false,"mode":"ojs"},{"id":20,"value":"topojson = require(\"topojson@3\")","pinned":false,"hidden":false,"mode":"ojs"},{"id":15,"value":"land = topojson.feature(world, world.objects.land)","pinned":false,"hidden":false,"mode":"ojs"},{"id":17,"value":"world = fetch(\n `https://cdn.jsdelivr.net/npm/world-atlas@2/countries-110m.json`\n).then(response => response.json())","pinned":false,"hidden":false,"mode":"ojs"},{"id":1151,"value":"water = topojson.mesh(world, world.objects.land, (a, b) => a === b)","pinned":false,"hidden":false,"mode":"ojs"},{"id":1191,"value":"not_water = topojson.mesh(world, world.objects.land, (a, b) => a !== b)","pinned":false,"hidden":false,"mode":"ojs"},{"id":103,"value":"import { thresholdColorScale } from \"@efrymire/gridding-map-files\"","pinned":false,"hidden":false,"mode":"ojs"},{"id":1322,"value":"contour = d3\n .contourDensity()\n .x(d => d[0])\n .y(d => d[1])\n .size([width, height]) // w,h\n .thresholds(10)\n .bandwidth(30)\n .cellSize(2)","pinned":false,"hidden":false,"mode":"ojs"},{"id":1717,"value":"import { ramp, swatches } from \"@d3/working-with-color\"","pinned":false,"hidden":false,"mode":"ojs"},{"id":152,"value":"import {\n sum_array,\n miliseconds_to_radius\n} from \"@aguformoso/multilateration-from-your-browser\"","pinned":false,"hidden":false,"mode":"ojs"},{"id":2910,"value":"import { cities } from \"@toja/all-the-cities\"","pinned":false,"hidden":false,"mode":"ojs"},{"id":23,"value":"html``","pinned":false,"hidden":false,"mode":"ojs"}],"files":"$W32","stdlib":"1","titling":"auto"}