Created
March 21, 2014 13:16
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Regular Polygons
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| <!DOCTYPE html> | |
| <html lang="ja"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Regular Polygons</title> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| function gen_poly(n) { | |
| var poly = []; | |
| var t1 = 2 * Math.PI / n; | |
| var t2 = Math.PI / n; | |
| for (var i = 0; i < n; i++) { | |
| var t = t2 + t1 * i; | |
| var x = Math.sin(t); | |
| var y = Math.cos(t); | |
| poly.push([x, y]); | |
| } | |
| return poly; | |
| } | |
| var line = d3.svg.line() | |
| .x(function(d) { return d[0]; }) | |
| .y(function(d) { return d[1]; }) | |
| .interpolate("interpolate"); | |
| var side = 100; | |
| var width = 400; | |
| var height = 400; | |
| var opt_fill = true; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.append("rect") | |
| .attr("x", 0) | |
| .attr("y", 0) | |
| .attr("width", width) | |
| .attr("height", height) | |
| .attr("fill", opt_fill ? "#ffffe0" : "none") | |
| .attr("stroke", "none"); | |
| for (i = 12; i >= 3; i--) { | |
| // var t1 = 2 * Math.PI / i; | |
| var t2 = Math.PI / i; | |
| var r = 0.5 / Math.sin(t2); | |
| var side_r = side * r; | |
| var trans = "translate(" + (width / 2) + "," + (height / 2) + ") scale(" + side_r + "," + side_r + ")"; | |
| var g = svg.append("g") | |
| .attr("transform", trans); | |
| g.selectAll("path" + i) | |
| .data([gen_poly(i)]) | |
| .enter() | |
| .append("path") | |
| .attr("d", function(d) { return line(d) + "z"; }) | |
| .attr("fill", opt_fill ? "#ccf" : "none") | |
| .attr("stroke", "black") | |
| .attr("stroke-width", 2 / side_r); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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