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Point on Archimedean Spiral
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| svg { | |
| border: 1px solid black; | |
| } | |
| .spiral { | |
| fill: none; | |
| stroke: #303030; | |
| stroke-width: 3px; | |
| } | |
| circle { | |
| fill: orange; | |
| stroke: black; | |
| stroke-width: 1.5px; | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta name="description" content="Point on Archimedean Spiral" /> | |
| <meta http-equiv="Content-Type" content="text/html;charset=utf-8"> | |
| <title>Point on Archimedean Spiral</title> | |
| <script type="text/javascript" src="http://d3js.org/d3.v2.js"></script> | |
| </head> | |
| <body> | |
| <div id="chart"></div> | |
| </body> | |
| </html> |
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| var duration = 5000; | |
| var width = 600, | |
| height = 430, | |
| num_axes = 8, | |
| start = 0, | |
| end = 6; | |
| var theta = function (r) { | |
| return 2*Math.PI*r; | |
| }; | |
| var radius = d3.scale.linear() | |
| .domain([start, end]) | |
| .range([0, d3.min([width,height])/2.5]); | |
| var angle = d3.scale.linear() | |
| .domain([0, num_axes]) | |
| .range([0,360]); | |
| var svg = d3.select("#chart").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append("g") | |
| .attr("transform", "translate(" + width/2 + "," + (height/2) +")"); | |
| var pieces = d3.range(start, end+0.01, (end-start)/1000); | |
| var spiral = d3.svg.line.radial() | |
| .interpolate("cardinal") | |
| .angle(theta) | |
| .radius(radius); | |
| var path = svg.selectAll(".spiral") | |
| .data([pieces]) | |
| .enter().append("path") | |
| .attr("class", "spiral") | |
| .attr("d", spiral) | |
| .attr("transform", function(d, i) { | |
| return "translate(" + (-width/1.8*i) + ", 0)"; | |
| }); | |
| var circle = svg.append("circle") | |
| .attr("r", 5.5); | |
| function transition() { | |
| circle.transition() | |
| .duration(duration) | |
| .attrTween("transform", translateAlong(path.node())) | |
| .each("end", transition); | |
| } | |
| transition(); | |
| function speed_change(val) { | |
| duration = 10000 - (val*1000); | |
| } | |
| function translateAlong(path) { | |
| var l = path.getTotalLength(); | |
| return function(d, i, a) { | |
| return function(t) { | |
| var p = path.getPointAtLength(t * l); | |
| return "translate(" + p.x + "," + p.y + ")"; | |
| }; | |
| }; | |
| } |
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