This example generates a random polygon with a round look. Reload the page to generate a new one.
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August 29, 2015 14:03
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Random(ish) polygon
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| svg = d3.select('svg') | |
| width = svg[0][0].getBoundingClientRect().width | |
| height = svg[0][0].getBoundingClientRect().height | |
| side = Math.min(width, height) | |
| vis = svg.append('g') | |
| .attr | |
| transform: "translate(#{width/2} #{height/2})" | |
| # generate N random points | |
| N = 20 + 20 * Math.round(Math.random()) | |
| angles = d3.range(N).map (i) -> Math.random() | |
| sum = d3.sum(angles) | |
| theta_prev = 0 | |
| points = angles.map (a) -> | |
| theta = theta_prev + a * 2*Math.PI/sum | |
| theta_prev = theta | |
| rho = d3.random.normal(side/3, side/32)() | |
| return [rho*Math.cos(theta), rho*Math.sin(theta)] | |
| vis.append('path') | |
| .datum(points) | |
| .attr | |
| class: 'polygon' | |
| d: (points) -> "M#{points.join('L')}Z" | |
| vis.selectAll('.dots') | |
| .data(points) | |
| .enter().append('circle') | |
| .attr | |
| class: 'dot' | |
| cx: (p) -> p[0] | |
| cy: (p) -> p[1] | |
| r: 2.5 |
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| svg { | |
| background-color: white; | |
| } | |
| .polygon { | |
| stroke: gray; | |
| fill: #DDD; | |
| } | |
| .dot { | |
| fill: white; | |
| stroke: black; | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="description" content="Random(ish) polygon" /> | |
| <title>Random(ish) polygon</title> | |
| <link rel="stylesheet" href="index.css"> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| </head> | |
| <body> | |
| <svg height="500" width="960"> | |
| </svg> | |
| <script src="index.js"></script> | |
| </body> | |
| </html> |
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| (function() { | |
| var N, angles, height, points, side, sum, svg, theta_prev, vis, width; | |
| svg = d3.select('svg'); | |
| width = svg[0][0].getBoundingClientRect().width; | |
| height = svg[0][0].getBoundingClientRect().height; | |
| side = Math.min(width, height); | |
| vis = svg.append('g').attr({ | |
| transform: "translate(" + (width / 2) + " " + (height / 2) + ")" | |
| }); | |
| N = 20 + 20 * Math.round(Math.random()); | |
| angles = d3.range(N).map(function(i) { | |
| return Math.random(); | |
| }); | |
| sum = d3.sum(angles); | |
| theta_prev = 0; | |
| points = angles.map(function(a) { | |
| var rho, theta; | |
| theta = theta_prev + a * 2 * Math.PI / sum; | |
| theta_prev = theta; | |
| rho = d3.random.normal(side / 3, side / 32)(); | |
| return [rho * Math.cos(theta), rho * Math.sin(theta)]; | |
| }); | |
| vis.append('path').datum(points).attr({ | |
| "class": 'polygon', | |
| d: function(points) { | |
| return "M" + (points.join('L')) + "Z"; | |
| } | |
| }); | |
| vis.selectAll('.dots').data(points).enter().append('circle').attr({ | |
| "class": 'dot', | |
| cx: function(p) { | |
| return p[0]; | |
| }, | |
| cy: function(p) { | |
| return p[1]; | |
| }, | |
| r: 2.5 | |
| }); | |
| }).call(this); |
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