D3.js 4.x の forceSimulation を canvas で実行するデモ
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January 11, 2017 12:07
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D3.js forceSimulation with canvas
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| function Graph(canvas) { | |
| var that = this; | |
| this.canvas = canvas; | |
| this.nodes = []; | |
| this.links = []; | |
| this.radius = 20; | |
| this.distance = 80; | |
| this.simulation = d3.forceSimulation(); | |
| this.simulation.force("link", d3.forceLink().distance(function(d) { | |
| return that.distance; | |
| })); | |
| this.simulation.force("charge", d3.forceManyBody()); | |
| this.simulation.force("center", d3.forceCenter(canvas.width / 2, canvas.height / 2)); | |
| this.simulation.on("tick", function() { | |
| that.paint(); | |
| }); | |
| d3.select(canvas) | |
| .call(d3.drag() | |
| .container(canvas) | |
| .subject(function() { | |
| return that.simulation.find(d3.event.x, d3.event.y, that.radius); | |
| }) | |
| .on("start", function() { | |
| if (!d3.event.active) that.simulation.alphaTarget(0.3).restart(); | |
| d3.event.subject.fx = d3.event.subject.x; | |
| d3.event.subject.fy = d3.event.subject.y; | |
| }) | |
| .on("drag", function() { | |
| d3.event.subject.fx = d3.event.x; | |
| d3.event.subject.fy = d3.event.y; | |
| }) | |
| .on("end", function() { | |
| if (!d3.event.active) that.simulation.alphaTarget(0); | |
| d3.event.subject.fx = null; | |
| d3.event.subject.fy = null; | |
| })); | |
| } | |
| Graph.prototype.setSize = function(width, height) { | |
| this.simulation.force("center", d3.forceCenter(width / 2, height / 2)); | |
| this.simulation.alphaTarget(0).restart(); | |
| }; | |
| Graph.prototype.getNodeById = function(id) { | |
| return this.nodes.find(function(a) { | |
| return a.id === id; | |
| }); | |
| }; | |
| Graph.prototype.getLinkByIds = function(src, dst) { | |
| return this.links.find(function(a) { | |
| return (a.src === src && a.dst === dst) || (a.src === dst && a.dst === src); | |
| }); | |
| }; | |
| Graph.prototype.add = function(src, dst) { | |
| if (!this.getNodeById(src)) | |
| this.nodes.push({ | |
| id: src, | |
| x: this.canvas.width * Math.random(), | |
| y: this.canvas.height * Math.random() | |
| }); | |
| if (!this.getNodeById(dst)) | |
| this.nodes.push({ | |
| id: dst, | |
| x: this.canvas.width * Math.random(), | |
| y: this.canvas.height * Math.random() | |
| }); | |
| if (src !== dst && !this.getLinkByIds(src, dst)) | |
| this.links.push({ | |
| source: this.getNodeById(src), | |
| target: this.getNodeById(dst) | |
| }); | |
| this.simulation.nodes(this.nodes); | |
| this.simulation.force("link").links(this.links); | |
| this.simulation.alphaTarget(0.3).restart(); | |
| return this; | |
| }; | |
| Graph.prototype.paint = function() { | |
| var c = this.canvas.getContext("2d"); | |
| var r = this.radius; | |
| // clear | |
| c.clearRect(0, 0, this.canvas.width, this.canvas.height); | |
| c.save(); | |
| // 背面にリンクを描画 | |
| this.links.forEach(function(d) { | |
| c.strokeStyle = "#000000"; | |
| c.lineWidth = 3; | |
| c.beginPath(); | |
| c.moveTo(d.source.x, d.source.y); | |
| c.lineTo(d.target.x, d.target.y); | |
| c.stroke(); | |
| }); | |
| // 前面にノードを描画 | |
| this.nodes.forEach(function(d) { | |
| // circle | |
| c.fillStyle = "#ffffff"; | |
| c.strokeStyle = "#000000"; | |
| c.lineWidth = 3; | |
| c.beginPath(); | |
| c.moveTo(d.x + r, d.y); | |
| c.arc(d.x, d.y, r, 0, 2 * Math.PI); | |
| c.fill(); | |
| c.stroke(); | |
| // text | |
| c.fillStyle = "#000"; | |
| c.font = "24px sans-serif"; | |
| c.fillText(d.id, d.x - r / 2, d.y + r / 2); | |
| }); | |
| // 反映する | |
| c.restore(); | |
| }; |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>D3.js and Graph</title> | |
| <script src="https://unpkg.com/d3@4.4.0/build/d3.min.js"></script> | |
| <script src="graph.js"></script> | |
| <style> | |
| canvas { | |
| display: block; | |
| position: absolute; | |
| top: 0; | |
| left: 0; | |
| bottom: 0; | |
| right: 0; | |
| background: #ccc; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <canvas id="canvas" width="800" height="600"></canvas> | |
| <script> | |
| var canvas = document.getElementById("canvas"); | |
| canvas.width = window.innerWidth; | |
| canvas.height = window.innerHeight; | |
| var graph = new Graph(canvas); | |
| var fire = function() { | |
| var a = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; | |
| var src = a[Math.floor(a.length * Math.random())]; | |
| var dst = a[Math.floor(a.length * Math.random())]; | |
| graph.add(src, dst); | |
| }; | |
| canvas.addEventListener("click", fire); | |
| setInterval(fire, 1000); | |
| window.addEventListener("resize", function() { | |
| canvas.width = window.innerWidth; | |
| canvas.height = window.innerHeight; | |
| graph.setSize(canvas.width, canvas.height); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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