canvas力导布局

老规矩，先上效果图

<html><head><style>* {margin: 0;padding: 0;}canvas {display: block;width: 100%;height: 100%;background: #000;}</style>
</head><body><canvas id="network"></canvas>
</body>
<script>class TaskQueue {constructor() {this.taskList = []this.hasTaskDone = falsethis.status = 'do' // do or stopthis.requestAnimationFrame = nullthis.requestAnimationFrameDrawBind = this.requestAnimationFrameDraw.bind(this)}addTask(func) {this.taskList.push(func)if (this.requestAnimationFrame === null) {this.addRequestAnimationFrame()this.do()}}do() {this.status = 'do'new Promise(res => {this.taskList[0] && this.taskList[0]()this.taskList.shift()this.hasTaskDone = trueres()}).then(() => {if (this.status === 'do' && this.taskList.length) {this.do()}})}stop() {this.status = 'stop'}requestAnimationFrameDraw() {this.stop()if (this.hasTaskDone && this.reDraw) {this.hasTaskDone = falsethis.reDraw()}if (this.taskList.length) {this.addRequestAnimationFrame()this.do()} else {this.clearRequestAnimationFrame()}}addRequestAnimationFrame() {this.requestAnimationFrame = window.requestAnimationFrame(this.requestAnimationFrameDrawBind)}clearRequestAnimationFrame() {window.cancelAnimationFrame(this.requestAnimationFrame)this.requestAnimationFrame = null}removeEvent() {this.stop()this.clearRequestAnimationFrame()}}class Layout extends TaskQueue {constructor(opt) {super(opt)this.qIndex = opt.layout.qIndexthis.fStableL = opt.layout.fStableLthis.fIndex = opt.layout.fIndexthis.count = opt.layout.count || opt.nodes.length * Math.ceil(opt.nodes.length / 5)this.countForce = 0}doLayout() {this.countForce++if (this.countForce >= this.count) {return}// 计算开始this.forceComputed(this.arc, this.line)setTimeout(() => {this.addTask(() => {this.doLayout();})})}forceComputed(nodes) {nodes.forEach(item => {item.translateX = 0item.translateY = 0})nodes.forEach((curNode, index) => {// 库仑力计算for (let i = index + 1; i < nodes.length; i++) {let otherNode = nodes[i]if (otherNode) {this.computedXYByQ(curNode, otherNode)}}// 弹簧力计算if (curNode.fromArcs?.length) {curNode.fromArcs.forEach(id => {let fromNode = nodes.filter(node => {return node.id === id})[0]if (fromNode) {this.computedXYByK(curNode, fromNode)}})}// 中心拉力if (curNode.fromArcs?.length) {this.computedXYByK(curNode, {xy: {x: this.canvas.width / 2,y: this.canvas.height / 2}})}})// let maxTranslate = 1// nodes.forEach(item => {//     if(item.translateX && Math.abs(item.translateX) > maxTranslate){//         maxTranslate = Math.abs(item.translateX)//     }//     if(item.translateY && Math.abs(item.translateY) > maxTranslate){//         maxTranslate = Math.abs(item.translateY)//     }// })// nodes.forEach(item => {//     if(item.translateX){//         item.x += item.translateX / maxTranslate//     }//     if(item.translateY){//         item.y += item.translateY / maxTranslate//     }// })nodes.forEach(item => {if (item.translateX) {item.xy.x += item.translateX}if (item.translateY) {item.xy.y += item.translateY}})}computedXYByQ(node1, node2) {let x1 = node1.xy.xlet y1 = node1.xy.ylet x2 = node2.xy.xlet y2 = node2.xy.ylet xl = x2 - x1let yl = y2 - y1let angle = Math.PIif (!xl) {if (y2 > y1) {angle = -Math.PI / 2} else {angle = Math.PI / 2}} else if (!yl) {if (x2 > x1) {angle = 0} else {angle = Math.PI}} else {angle = Math.atan(yl / xl)}let r = Math.sqrt(Math.pow(xl, 2) + Math.pow(yl, 2))if (r < 1) {r = 1}// 库仑力 r越大，库仑力越小let node1Q = (node1.fromNodes?.length || 0) + (node1.toNodes?.length || 0) + 1let node2Q = (node2.fromNodes?.length || 0) + (node2.toNodes?.length || 0) + 1let f = this.qIndex * node1Q * node2Q / Math.pow(r, 2)let fx = f * Math.cos(angle)let fy = f * Math.sin(angle)node1.translateX = node1.translateXnode1.translateY = node1.translateYnode2.translateX = node2.translateXnode2.translateY = node2.translateY// node1.translateX -= fx// node2.translateX += fx// node1.translateY -= fy// node2.translateY += fyif (x2 > x1) {if (fx > 0) {node1.translateX -= fxnode2.translateX += fx} else {node1.translateX += fxnode2.translateX -= fx}} else {if (fx > 0) {node1.translateX += fxnode2.translateX -= fx} else {node1.translateX -= fxnode2.translateX += fx}}if (y2 > y1) {if (fy > 0) {node1.translateY -= fynode2.translateY += fy} else {node1.translateY += fynode2.translateY -= fy}} else {if (fy > 0) {node1.translateY += fynode2.translateY -= fy} else {node1.translateY -= fynode2.translateY += fy}}}computedXYByK(node1, node2) {let x1 = node1.xy.xlet y1 = node1.xy.ylet x2 = node2.xy.xlet y2 = node2.xy.ylet xl = x2 - x1let yl = y2 - y1let angle = Math.PIif (!xl) {if (y2 > y1) {angle = -Math.PI / 2} else {angle = Math.PI / 2}} else if (!yl) {if (x2 > x1) {angle = 0} else {angle = Math.PI}} else {angle = Math.atan(yl / xl)}let r = Math.sqrt(Math.pow(xl, 2) + Math.pow(yl, 2))if (r > this.fStableL * 2) {r = this.fStableL * 2} else if (r < 1) {r = 1}// 弹簧力let f = this.fIndex * (r - this.fStableL)let fx = f * Math.cos(angle)let fy = f * Math.sin(angle)node1.translateX = node1.translateXnode1.translateY = node1.translateYnode2.translateX = node2.translateXnode2.translateY = node2.translateYif (f > 0) {// 拉力if (x2 > x1) {if (fx > 0) {node1.translateX += fxnode2.translateX -= fx} else {node1.translateX -= fxnode2.translateX += fx}} else {if (fx > 0) {node1.translateX -= fxnode2.translateX += fx} else {node1.translateX += fxnode2.translateX -= fx}}if (y2 > y1) {if (fy > 0) {node1.translateY += fynode2.translateY -= fy} else {node1.translateY -= fynode2.translateY += fy}} else {if (fy > 0) {node1.translateY -= fynode2.translateY += fy} else {node1.translateY += fynode2.translateY -= fy}}} else {// 弹力if (x2 > x1) {if (fx > 0) {node1.translateX -= fxnode2.translateX += fx} else {node1.translateX += fxnode2.translateX -= fx}} else {if (fx > 0) {node1.translateX += fxnode2.translateX -= fx} else {node1.translateX -= fxnode2.translateX += fx}}if (y2 > y1) {if (fy > 0) {node1.translateY -= fynode2.translateY += fy} else {node1.translateY += fynode2.translateY -= fy}} else {if (fy > 0) {node1.translateY += fynode2.translateY -= fy} else {node1.translateY -= fynode2.translateY += fy}}}}}class View extends Layout {constructor(opt) {super(opt)this.canvas = opt.canvasthis.dpr = window.devicePixelRatio || 1this.nodes = opt.nodesthis.paths = opt.pathsthis.circleStyle = opt.circleStylethis.lineStyle = opt.lineStylethis.line = []this.arc = []this.init()}init() {if (!this.canvas) {return}if (this.canvas.width !== Math.floor(this.canvas.offsetWidth * this.dpr) || this.canvas.height !== Math.floor(this.canvas.offsetHeight * this.dpr)) {this.canvas.width = Math.floor(this.canvas.offsetWidth * this.dpr)this.canvas.height = Math.floor(this.canvas.offsetHeight * this.dpr)}this.ctx = this.canvas.getContext('2d')this.addData(this.nodes, this.paths)}addData(nodes, paths) {if (nodes && nodes.length) {this.addArc(nodes)}if (paths && paths.length) {this.addLine(paths)}super.countForce = 0super.doLayout()}addArc(nodes) {// 数据多时可以考虑将初始化随机坐标范围与数据量做等比函数nodes.forEach(node => {this.arc.push({id: node.id,fromArcs: [],toArcs: [],xy: {x: this.rand(0, this.canvas.width),y: this.rand(0, this.canvas.height)}})})}addLine(paths) {paths.forEach(path => {let fromArc = this.arc.filter(node => {return node.id === path.from})[0]let toArc = this.arc.filter(node => {return node.id === path.to})[0]fromArc.toArcs.push(toArc.id)toArc.fromArcs.push(fromArc.id)if (fromArc && toArc) {this.line.push({id: path.id,from: path.from,to: path.to,fromArc,toArc})}})}reDraw() {this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height)this.draw()}draw() {this.line.forEach(item => {this.drawLine(item)})this.arc.forEach(item => {this.drawArc(item)})}drawLine(data) {this.ctx.save()this.ctx.translate(this.canvas.width / 2, this.canvas.height / 2)this.ctx.scale(this.scaleC, this.scaleC)this.ctx.translate(-this.canvas.width / 2, -this.canvas.height / 2)this.ctx.beginPath()this.ctx.lineWidth = this.lineStyle.widththis.ctx.strokeStyle = this.lineStyle.colorthis.ctx.moveTo(data.fromArc.xy.x, data.fromArc.xy.y)this.ctx.lineTo(data.toArc.xy.x, data.toArc.xy.y)this.ctx.stroke()this.ctx.closePath()this.ctx.restore()}drawArc(data) {this.ctx.save()this.ctx.translate(this.canvas.width / 2, this.canvas.height / 2)this.ctx.scale(this.scaleC, this.scaleC)this.ctx.translate(-this.canvas.width / 2, -this.canvas.height / 2)this.ctx.beginPath()this.ctx.fillStyle = this.circleStyle.backgroundthis.ctx.arc(data.xy.x, data.xy.y, this.circleStyle.r, 0, 2 * Math.PI)this.ctx.fill()this.ctx.closePath()this.ctx.restore()}rand = (n, m) => {var c = m - n + 1return Math.floor(Math.random() * c + n)}}// 测试数据let data = {"nodes": [{"id": "36"},{"id": "50"},{"id": "20077"},{"id": "1090"},{"id": "1078"},{"id": "10007"},{"id": "20039"},{"id": "1074"},{"id": "20058"},{"id": "1062"},{"id": "10001"},{"id": "20076"},{"id": "1089"},{"id": "20038"},{"id": "1068"},{"id": "20057"},{"id": "1081"},{"id": "20070"},{"id": "1034"},{"id": "1077"},{"id": "10002"},{"id": "10003"},{"id": "20069"},{"id": "1002"},{"id": "47"},{"id": "10010"},{"id": "14"},{"id": "42"},{"id": "94"},{"id": "16"},{"id": "41"},{"id": "64"},{"id": "20002"},{"id": "73"},{"id": "1001"},{"id": "10009"},{"id": "10008"},{"id": "10006"},{"id": "10005"},{"id": "10004"},{"id": "33"},{"id": "10"},{"id": "18"},{"id": "70"},{"id": "98"},{"id": "20"},{"id": "24"},{"id": "20001"}],"paths": [{"id": "606","from": "50","to": "36"},{"id": "346","from": "20077","to": "1090"},{"id": "343","from": "1078","to": "10007"},{"id": "382","from": "20039","to": "1074"},{"id": "419","from": "20058","to": "1062"},{"id": "344","from": "1078","to": "10001"},{"id": "356","from": "20076","to": "1089"},{"id": "439","from": "20038","to": "1068"},{"id": "417","from": "20057","to": "1081"},{"id": "358","from": "20070","to": "1078"},{"id": "438","from": "20038","to": "1034"},{"id": "248","from": "1077","to": "10002"},{"id": "249","from": "1077","to": "10003"},{"id": "364","from": "20069","to": "1077"},{"id": "4797","from": "1002","to": "10003"},{"id": "4787","from": "1002","to": "10002"},{"id": "223","from": "1002","to": "10003"},{"id": "222","from": "1002","to": "10002"},{"id": "2659","from": "1002","to": "47"},{"id": "4777","from": "1002","to": "10001"},{"id": "4867","from": "1002","to": "10010"},{"id": "1466","from": "14","to": "1002"},{"id": "1437","from": "42","to": "1002"},{"id": "1414","from": "94","to": "1002"},{"id": "1411","from": "16","to": "1002"},{"id": "1395","from": "16","to": "1002"},{"id": "1382","from": "41","to": "1002"},{"id": "1377","from": "64","to": "1002"},{"id": "436","from": "20002","to": "1002"},{"id": "2658","from": "73","to": "1002"},{"id": "4856","from": "1001","to": "10009"},{"id": "4846","from": "1001","to": "10008"},{"id": "4836","from": "1001","to": "10007"},{"id": "4826","from": "1001","to": "10006"},{"id": "4816","from": "1001","to": "10005"},{"id": "4806","from": "1001","to": "10004"},{"id": "4796","from": "1001","to": "10003"},{"id": "4786","from": "1001","to": "10002"},{"id": "4776","from": "1001","to": "10001"},{"id": "221","from": "1001","to": "10001"},{"id": "4866","from": "1001","to": "10010"},{"id": "1469","from": "33","to": "1001"},{"id": "1459","from": "10","to": "1001"},{"id": "1448","from": "18","to": "1001"},{"id": "1406","from": "70","to": "1001"},{"id": "1396","from": "47","to": "1001"},{"id": "1369","from": "98","to": "1001"},{"id": "1365","from": "20","to": "1001"},{"id": "1363","from": "24","to": "1001"},{"id": "406","from": "20001","to": "1001"}]}// canvas domconst canvas = document.getElementById('network');new View({canvas,nodes: data.nodes,paths: data.paths,circleStyle: {r: 10,background: '#FFFFFF'},lineStyle: {width: 1,color: '#FFFFFF'},layout: {qIndex: 2000, // 库仑力系数，值越大，库仑力越大fStableL: 80,fIndex: 0.1, // 拉力系数，数值越大，力越大}})
</script></html>

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