Tissot's Indicatrix rendered with D3.
NB:- see Jason's comment about these not being "true" Tissot indicatrices.
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Tissot's Indicatrices
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| margin: 0; | |
| } | |
| .background { | |
| fill: #bee8ff; | |
| } | |
| .foreground { | |
| fill: none; | |
| stroke: #ccc; | |
| stroke-width: 1.5px; | |
| } | |
| .graticule { | |
| fill: none; | |
| stroke: #aaa; | |
| stroke-width: .5px; | |
| } | |
| .land { | |
| fill: #b7db6e; | |
| stroke: #4f6521; | |
| } | |
| .boundary { | |
| fill: none; | |
| stroke: #7b9545; | |
| } | |
| .tissot { | |
| fill: rgba(255,0,0,0.5); | |
| stroke: none; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var radians = Math.PI / 180.0; | |
| var width = window.innerWidth, | |
| height = window.innerHeight; | |
| var projection = d3.geo.orthographic() | |
| .scale(Math.min(width,height)*0.45) | |
| .translate([width / 2 - .5, height / 2 - .5]) | |
| .rotate([-30,-30]) | |
| .clipAngle(90 + 1e-6); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var graticule = d3.geo.graticule().step([30,30]); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.append("path") | |
| .datum(graticule.outline) | |
| .attr("class", "background") | |
| .attr("d", path); | |
| svg.selectAll(".graticule") | |
| .data(graticule.lines) | |
| .enter().append("path") | |
| .attr("class", "graticule") | |
| .attr("d", path); | |
| svg.append("path") | |
| .datum(graticule.outline) | |
| .attr("class", "foreground") | |
| .attr("d", path); | |
| d3.json("readme-boundaries.json", function(error, collection) { | |
| svg.insert("path", ".graticule") | |
| .datum(collection) | |
| .attr("class", "boundary") | |
| .attr("d", path); | |
| }); | |
| d3.json("readme-land.json", function(error, collection) { | |
| svg.insert("path", ".graticule,.boundary") | |
| .datum(collection) | |
| .attr("class", "land") | |
| .attr("d", path); | |
| }); | |
| var indicatices = d3.merge(d3.range(-180,181,30).map(function(lon) { | |
| return d3.range(-60,61,30).map(function(lat) { | |
| return d3.geo.circle().origin([ lon, lat ]).angle(7.0)(); | |
| }); | |
| })); | |
| svg.selectAll("path.tissot") | |
| .data(indicatices) | |
| .enter().append("path") | |
| .attr("class", "tissot") | |
| .attr("d", path); | |
| </script> |
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