D3 3.0 supports three-axis rotation for geographic projections. This example demonstrates rotating lambda (λ), phi (φ) and gamma (γ) in three side-by-side orthographic projections.
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Three-Axis Rotation
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .title { | |
| display: inline-block; | |
| font-size: 48px; | |
| line-height: 90px; | |
| text-align: center; | |
| } | |
| </style> | |
| <body> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var diameter = 960 / 3, | |
| radius = diameter / 2, | |
| velocity = 0.01; | |
| var projection = d3.geoOrthographic() | |
| .scale(radius - 2) | |
| .translate([radius, radius]) | |
| .clipAngle(90) | |
| .precision(0); | |
| d3.select("body").selectAll(".title") | |
| .data(["λ", "φ", "γ"]) | |
| .enter().append("div") | |
| .attr("class", "title") | |
| .style("width", diameter + "px") | |
| .text(function(d) { return d; }); | |
| var canvas = d3.select("body").selectAll("canvas") | |
| .data(d3.range(3)) | |
| .enter().append("canvas") | |
| .datum(function() { return this.getContext("2d"); }) | |
| .attr("width", diameter) | |
| .attr("height", diameter); | |
| var path = d3.geoPath() | |
| .projection(projection); | |
| d3.json("/mbostock/raw/4090846/world-110m.json", function(error, world) { | |
| if (error) throw error; | |
| var land = topojson.feature(world, world.objects.land), | |
| globe = {type: "Sphere"}; | |
| d3.timer(function(elapsed) { | |
| var angle = velocity * elapsed; | |
| canvas.each(function(context, i) { | |
| var rotate = [0, 0, 0]; | |
| rotate[i] = angle, projection.rotate(rotate); | |
| context.clearRect(0, 0, diameter, diameter); | |
| context.beginPath(), path.context(context)(land), context.fill(); | |
| context.beginPath(), path(globe), context.stroke(); | |
| }); | |
| }); | |
| }); | |
| </script> |
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