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Winding Order
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| license: gpl-3.0 | |
| height: 2064 | |
| border: no | |
| redirect: https://observablehq.com/@d3/winding-order |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| margin: 0; | |
| } | |
| svg { | |
| font: 10px sans-serif; | |
| border: solid 1px #ccc; | |
| margin-bottom: 10px; | |
| } | |
| </style> | |
| <svg style="position:absolute;top:-1000px;"> | |
| <defs> | |
| <marker id="arrow" markerWidth="10" markerHeight="10" refX="0" refY="3" orient="auto" markerUnits="strokeWidth"> | |
| <path d="M0,0 L0,6 L9,3 z" fill="#000"></path> | |
| </marker> | |
| </defs> | |
| </svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var A = {type: "Polygon", coordinates: [[[0, 0], [10, 0], [10, 10], [0, 10], [0, 0]]]}, | |
| B = {type: "Polygon", coordinates: [A.coordinates[0].slice().reverse()]}; | |
| </script> | |
| <script> | |
| var path = d3.geoPath(d3.geoOrthographic().rotate([-20, -20]).precision(0.1)); | |
| var svg = d3.select("body").selectAll() | |
| .data([A, B]) | |
| .enter().append("svg") | |
| .attr("width", 958) | |
| .attr("height", 500); | |
| svg.append("path") | |
| .attr("fill", "none") | |
| .attr("stroke", "#000") | |
| .attr("d", path(d3.geoGraticule10())); | |
| svg.append("path") | |
| .attr("fill", "red") | |
| .attr("fill-opacity", 0.5) | |
| .attr("d", path); | |
| svg.append("path") | |
| .attr("fill", "none") | |
| .attr("stroke", "#000") | |
| .attr("marker-mid", "url(#arrow)") | |
| .attr("marker-end", "url(#arrow)") | |
| .attr("d", function(d) { return path({type: "LineString", coordinates: d.coordinates[0]}); }); | |
| svg.append("path") | |
| .attr("fill", "none") | |
| .attr("stroke", "#000") | |
| .attr("d", path({type: "Sphere"})); | |
| svg.append("text") | |
| .attr("x", 10) | |
| .attr("y", 10) | |
| .attr("dy", "0.71em") | |
| .text(function(d) { return "ring = " + JSON.stringify(d.coordinates[0]); }); | |
| svg.append("text") | |
| .attr("x", 10) | |
| .attr("y", 10) | |
| .attr("dy", "2em") | |
| .text(function(d) { return "area = " + d3.geoArea(d); }); | |
| </script> | |
| <script> | |
| var path = d3.geoPath(d3.geoIdentity().translate([480 - 50, 250 - 50]).scale(10)); | |
| var svg = d3.select("body").selectAll() | |
| .data([A, B]) | |
| .enter().append("svg") | |
| .attr("width", 958) | |
| .attr("height", 500); | |
| svg.append("path") | |
| .attr("fill", "red") | |
| .attr("fill-opacity", 0.5) | |
| .attr("d", path); | |
| svg.append("path") | |
| .attr("fill", "none") | |
| .attr("stroke", "#000") | |
| .attr("marker-mid", "url(#arrow)") | |
| .attr("marker-end", "url(#arrow)") | |
| .attr("d", function(d) { return path({type: "LineString", coordinates: d.coordinates[0]}); }); | |
| svg.append("text") | |
| .attr("x", 10) | |
| .attr("y", 10) | |
| .attr("dy", "0.71em") | |
| .text(function(d) { return "ring = " + JSON.stringify(d.coordinates[0]); }); | |
| svg.append("text") | |
| .attr("x", 10) | |
| .attr("y", 10) | |
| .attr("dy", "2em") | |
| .text(function(d) { return "area = " + path.area(d); }); | |
| </script> |
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