A d3 version of circle wave on svg and canvas thanks to d3-canvas-transition module.
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September 6, 2017 21:43
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Circle Wave on Canvas
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| license: bsd-3-clause |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Circle wave</title> | |
| <script src="https://d3js.org/d3.v4.js"></script> | |
| <script src="https://unpkg.com/[email protected]/build/d3-canvas-transition.js"></script> | |
| <style> | |
| #panel { | |
| background-color: rgba(245,245,245,0.9); | |
| padding: 5px; | |
| position: absolute; | |
| display: block; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="panel"> | |
| <div id="paper"> | |
| <label> | |
| <input id='svg' name="type" type="radio" checked> | |
| <span>svg</span> | |
| </label> | |
| <label> | |
| <input id='canvas' name="type" type="radio"> | |
| <span>canvas</span> | |
| </label> | |
| </div> | |
| <div id="fps">FPS: <span>?</span></div> | |
| </div> | |
| <div id="example" style="max-width: 960px"></div> | |
| <script> | |
| (function () { | |
| d3.select('#svg').on('click', function () { | |
| draw('svg'); | |
| }); | |
| d3.select('#canvas').on('click', function () { | |
| draw('canvas'); | |
| }); | |
| if (d3.resolution() > 1) { | |
| d3.select('#paper').append('label').html( | |
| "<input id='canvas-low' name='type' type='radio'><span>canvas low resolution</span>" | |
| ); | |
| d3.select('#canvas-low').on('click', function () { | |
| draw('canvas', 1); | |
| }); | |
| } | |
| var angles = d3.range(0, 2 * Math.PI, Math.PI / 200), | |
| fps = d3.select("#fps span"), | |
| time0 = d3.now(), frames = 0, time1; | |
| draw('svg'); | |
| d3.timer(function () { | |
| path.attr("d", function (d) { | |
| return d(angles); | |
| }); | |
| frames++; | |
| time1 = d3.now(); | |
| if (time1 - time0 > 1000) { | |
| fps.text(Math.round(1000*frames/(time1 - time0))); | |
| time0 = time1; | |
| frames = 0; | |
| } | |
| }); | |
| function draw(type, r) { | |
| var example = d3.select("#example"), | |
| width = d3.getSize(example.style('width')), | |
| height = Math.min(500, width); | |
| example.select('.paper').remove(); | |
| var paper = example | |
| .append(type) | |
| .classed('paper', true) | |
| .attr('width', width).attr('height', height).canvasResolution(r).canvas(true); | |
| path = paper.append("g") | |
| .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")") | |
| .attr("fill", "none") | |
| .attr("stroke-width", 10) | |
| .attr("stroke-linejoin", "round") | |
| .selectAll("path") | |
| .data(["#f03b20", "#2c7fb8", "#31a354"]) | |
| .enter().append("path") | |
| .attr("stroke", function (d) { | |
| return d; | |
| }) | |
| .style("mix-blend-mode", "darken") | |
| .datum(function (d, i) { | |
| return d3.radialLine() | |
| .curve(d3.curveLinearClosed) | |
| .angle(function (a) { | |
| return a; | |
| }) | |
| .radius(function (a) { | |
| var t = d3.now() / 1000; | |
| return 200 + Math.cos(a * 8 - i * 2 * Math.PI / 3 + t) * Math.pow((1 + Math.cos(a - t)) / 2, 3) * 32; | |
| }); | |
| }); | |
| } | |
| }()); | |
| </script> | |
| </body> |
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