Testing the new projection API.
The Orthographic projection is available as d3.geo.orthographic in the geo.projection D3 plugin.
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Adaptive Resampling
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .background { | |
| fill: #a4bac7; | |
| } | |
| .foreground { | |
| fill: none; | |
| stroke: #333; | |
| stroke-width: 1.5px; | |
| } | |
| .graticule { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: .5px; | |
| } | |
| .graticule:nth-child(2n) { | |
| stroke-dasharray: 2,2; | |
| } | |
| .land { | |
| fill: #d7c7ad; | |
| stroke: #766951; | |
| } | |
| .boundary { | |
| fill: none; | |
| stroke: #a5967e; | |
| } | |
| </style> | |
| <body> | |
| <script src="https://raw.github.com/jasondavies/d3/projection/d3.v2.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var projection = d3.geo.equirectangular().translate([width / 2 - .5, height / 2 - .5]).scale(150), | |
| path = d3.geo.path().projection(projection); | |
| var svg = d3.select("body").append("svg") | |
| .datum({x: 0, y: 0}) | |
| .attr("width", width) | |
| .attr("height", height) | |
| .call(d3.behavior.drag() | |
| .origin(Object) | |
| .on("drag", function(d) { | |
| d.x = d3.event.x; | |
| d.y = d3.event.y; | |
| projection.rotate([d.x, -d.y, 0]); | |
| svg.selectAll("path").attr("d", path); | |
| })); | |
| svg.append("rect") | |
| .attr("class", "background") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.selectAll(".graticule") | |
| .data(graticule) | |
| .enter().append("path") | |
| .attr("class", "graticule") | |
| .attr("d", path); | |
| function graticule() { | |
| var extent = [[-180, -90], [180, 90]], | |
| step = [22.5, 22.5], | |
| precision = [2, 2]; | |
| var xSteps = d3.range(extent[0][0], extent[1][0] - precision[0] / 2, precision[0]).concat(extent[1][0]), | |
| ySteps = d3.range(extent[0][1], extent[1][1] - precision[1] / 2, precision[1]).concat(extent[1][1]), | |
| xLines = d3.range(Math.ceil(extent[0][0] / step[0]) * step[0], extent[1][0], step[0]).map(function(x) { return ySteps.map(function(y) { return [x, y]; }); }), | |
| yLines = d3.range(Math.ceil(extent[0][1] / step[1]) * step[1], extent[1][1], step[1]).map(function(y) { return xSteps.map(function(x) { return [x, y]; }); }); | |
| return xLines.concat(yLines).map(function(coordinates) { | |
| return { | |
| type: "LineString", | |
| coordinates: coordinates | |
| }; | |
| }); | |
| } | |
| </script> |
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