Rendering a world map on svg and canvas, same codebase thanks to d3-canvas-transition module. Original svg version from world map.
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January 3, 2017 19:07
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World Map on Canvas
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| license: bsd-3-clause |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>World Map</title> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/d3-geo-projection.v1.min.js"></script> | |
| <script src="https://d3js.org/topojson.v2.min.js"></script> | |
| <script src="https://giottojs.org/d3-canvas-transition/0.3.3/d3-canvas-transition.js"></script> | |
| </head> | |
| <body> | |
| <div id="paper"> | |
| <label> | |
| <input id='svg' name="type" type="radio" checked> | |
| <span>svg</span> | |
| </label> | |
| <label> | |
| <input id='canvas' name="type" type="radio"> | |
| <span>canvas</span> | |
| </label> | |
| </div> | |
| <div id="example" style="max-width: 960px"></div> | |
| <style> | |
| label { | |
| background-color: white; | |
| } | |
| </style> | |
| <script> | |
| (function () { | |
| d3.select('#svg').on('click', function () { | |
| draw('svg'); | |
| }); | |
| d3.select('#canvas').on('click', function () { | |
| draw('canvas'); | |
| }); | |
| if (d3.resolution() > 1) { | |
| d3.select('#paper').append('label').html( | |
| "<input id='canvas-low' name='type' type='radio'><span>canvas low resolution</span>" | |
| ); | |
| d3.select('#canvas-low').on('click', function () { | |
| draw('canvas', 1); | |
| }); | |
| } | |
| var example = d3.select("#example"), | |
| width = d3.getSize(example.style('width')), | |
| height = Math.min(500, width), | |
| color = d3.scaleOrdinal(d3.schemeCategory10), | |
| world; | |
| d3.json("https://giottojs.org/geo/world-110m.json", function(error, w) { | |
| if (error) throw error; | |
| world = w; | |
| draw('svg'); | |
| }); | |
| function draw(type, r) { | |
| example.select('.paper').remove(); | |
| var paper = example | |
| .append(type) | |
| .classed('paper', true) | |
| .attr('width', width).attr('height', height).canvasResolution(r).canvas(true); | |
| var projection = d3.geoKavrayskiy7().scale(150) | |
| .translate([width / 2, height / 2]) | |
| .precision(.1); | |
| var path = d3.geoPath().projection(projection), | |
| graticule = d3.geoGraticule(); | |
| paper.append("path") | |
| .datum({type: "Sphere"}) | |
| .style("fill", "#fff") | |
| .style('stroke', '#000') | |
| .style('stroke-width', '2px') | |
| .attr("d", path); | |
| paper.append("path") | |
| .datum(graticule) | |
| .style("fill", "none") | |
| .style("stroke", '#777') | |
| .style("stroke-width", '.5px') | |
| .style("stroke-opacity", 0.5) | |
| .attr("d", path); | |
| var countries = topojson.feature(world, world.objects.countries).features, | |
| neighbors = topojson.neighbors(world.objects.countries.geometries); | |
| paper.selectAll(".country") | |
| .data(countries) | |
| .enter() | |
| .insert("path", ".graticule") | |
| .attr("class", "country") | |
| .attr("d", path) | |
| .style("fill", function (d, i) { | |
| return color(d.color = d3.max(neighbors[i], function (n) { | |
| return countries[n].color; | |
| }) + 1 | 0); | |
| }); | |
| paper.insert("path", ".graticule") | |
| .datum(topojson.mesh(world, world.objects.countries, function (a, b) { | |
| return a !== b; | |
| })) | |
| .style("fill", "none") | |
| .style("stroke", '#fff') | |
| .style("stroke-width", '.5px') | |
| .attr("d", path); | |
| } | |
| }()); | |
| </script> | |
| </body> |
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