This is an example of redering a d3.js force directed graph onto an HTML5 canvas.
Compare to Pure D3 Force and ReactJS + D3 Force.
Also compare an alternative method using custom-namespaced DOM elements here.
Last active
August 29, 2015 14:05
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Canvas + D3 Force
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| </head> | |
| <body> | |
| <script> | |
| var size = 1000; | |
| var height = 500; | |
| var width = 960; | |
| var charge = -0.3; | |
| var data = d3.range(size).map(function(){ | |
| return {r: Math.floor(Math.random() * 8 + 2)}; | |
| }); | |
| var start = new Date(); | |
| var time = 0; | |
| var ticks = 0; | |
| var force = d3.layout.force() | |
| .size([width, height]) | |
| .nodes(data) | |
| .charge(function(d){ | |
| return d.r * d.r * charge; | |
| }) | |
| .start(); | |
| var nodes = force.nodes(); | |
| var canvas = d3.select('body') | |
| .append('canvas') | |
| .attr({ | |
| height: height, | |
| width: width | |
| }); | |
| var context = canvas.node().getContext("2d"); | |
| force.on('tick', function(){ | |
| var renderStart = new Date(); | |
| context.clearRect(0, 0, width, height); | |
| context.fillStyle = "steelblue"; | |
| context.beginPath(); | |
| nodes.forEach(function(d) { | |
| context.moveTo(d.x, d.y); | |
| context.arc(d.x, d.y, d.r, 0, 2 * Math.PI); | |
| }); | |
| context.fill(); | |
| time += (new Date() - renderStart); | |
| ticks++; | |
| }); | |
| force.on('end', function(){ | |
| var totalTime = new Date() - start; | |
| console.log('Total Time:', totalTime); | |
| console.log('Render Time:', time); | |
| console.log('Ticks:', ticks); | |
| console.log('Average Time:', totalTime / ticks); | |
| }); | |
| </script> | |
| </html> |
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