Distribute points in a circle at random and uniformly.
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January 4, 2016 20:19
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Dot density circles
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| radius | value | |
|---|---|---|
| 100 | 500 | |
| 200 | 4000 | |
| 75 | 1000 | |
| 20 | 100 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .point{ | |
| fill-opacity:0.5; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, height = 700; | |
| var color = d3.scale.category10(); | |
| function pointInCircle(r){ | |
| var theta = 2 * Math.PI * Math.random(); | |
| var rootR = r * Math.sqrt(Math.random()); | |
| return { | |
| cx: rootR * Math.cos(theta), | |
| cy: rootR * Math.sin(theta) | |
| } | |
| } | |
| function drawDensityCircle(d,i){ | |
| var parent = d3.select(this); | |
| console.log(i,color(i)); | |
| for(var dot = 0; dot < d.value; dot++){ | |
| var p = pointInCircle(parseInt(d.radius)); | |
| p.r = 2; | |
| p['class'] = 'point'; | |
| p.fill = color(i); | |
| parent.append('circle').attr(p); | |
| } | |
| } | |
| d3.csv('data.csv',function(d){ | |
| d.map(function(d){ | |
| return { | |
| radius: parseInt(d.radius), | |
| value: parseInt(d.value) | |
| } | |
| }) | |
| d3.select('body') | |
| .append('svg').attr({width:width, height:height}) | |
| .selectAll('.area') | |
| .data(d) | |
| .enter() | |
| .append('g') | |
| .attr( 'transform', function(d,i){ | |
| var xpos = (width - (d.radius * 2)) * Math.random() + d.radius; | |
| var ypos = (height - (d.radius * 2)) * Math.random() + d.radius; | |
| return 'translate(' + xpos + ',' + height * Math.random() + ')'; | |
| }) | |
| .each(drawDensityCircle); | |
| }); | |
| </script> |
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