A series of related examples:
- Canvas geometric zooming
- Canvas semantic zooming
- SVG geometric zooming
- SVG semantic zooming
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Canvas Geometric Zooming
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>Zoom + Pan</title> | |
| <style> | |
| .overlay { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var randomX = d3.random.normal(width / 2, 80), | |
| randomY = d3.random.normal(height / 2, 80); | |
| var data = d3.range(20000).map(function() { | |
| return [ | |
| randomX(), | |
| randomY() | |
| ]; | |
| }); | |
| var canvas = d3.select("body").append("canvas") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .call(d3.behavior.zoom().scaleExtent([1, 8]).on("zoom", zoom)) | |
| .node().getContext("2d"); | |
| draw(); | |
| function zoom() { | |
| canvas.save(); | |
| canvas.clearRect(0, 0, width, height); | |
| canvas.translate(d3.event.translate[0], d3.event.translate[1]); | |
| canvas.scale(d3.event.scale, d3.event.scale); | |
| draw(); | |
| canvas.restore(); | |
| } | |
| function draw() { | |
| var i = -1, n = data.length, d; | |
| canvas.beginPath(); | |
| while (++i < n) { | |
| d = data[i]; | |
| canvas.moveTo(d[0], d[1]); | |
| canvas.arc(d[0], d[1], 2.5, 0, 2 * Math.PI); | |
| } | |
| canvas.fill(); | |
| } | |
| </script> |
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