JSPlumb.js 绘制关系拓扑图（力导向布局算法简单实现）

2024年5月28日 538次阅读

JSPlumb.js 绘制关系拓扑图（力导向布局算法简单实现）

d3 echarts 都可以画关系拓扑图（有环），但是总觉得不是自己想要的，改起来也很麻烦，所以可以用JSPlumb 自己绘制自己的关系拓扑图，拓扑图 = 绘图 + 自动布局算法。jsplumb 可以实现绘自己的结点，而自动布局则可以采用 力导向布局算法。
这里参考的是 https://www.jianshu.com/p/d3c64a39535a

随机生成结点 与结点的位置

 /** * A force directed graph layout implementation by liuchang on 2018/05/10. */
 const CANVAS_WIDTH = 1000;
 const CANVAS_HEIGHT = 1000;
 let k;
 let mNodeList = [];
 let mEdgeList = [];
 let mDxMap = { };
 let mDyMap = { };
 let mNodeMap = { };
 var json ={ } ;
function ForceDirected() { 
 //generate nodes and edges
 for (let i = 0; i < 20; i++) { 
 mNodeList.push(new Node(i));
 }
 for (let i = 0; i < 20; i++) { 
 let edgeCount = Math.random() * 8 + 1;
 for (let j = 0; j < edgeCount; j++) { 
 let targetId = Math.floor(Math.random() * 20);
 let edge = new Edge(i, targetId);
 mEdgeList.push(edge);
 }
 }
 if (mNodeList && mEdgeList) { 
 k = Math.sqrt(CANVAS_WIDTH * CANVAS_HEIGHT / mNodeList.length);
 }
 for (let i = 0; i < mNodeList.length; i++) { 
 let node = mNodeList[i];
 if (node) { 
 mNodeMap[node.id] = node;
 }
 }
 //随机生成坐标. Generate coordinates randomly.
 let initialX, initialY, initialSize = 40.0;
 for (let i in mNodeList) { 
 initialX = CANVAS_WIDTH * .5;
 initialY = CANVAS_HEIGHT * .5;
 mNodeList[i].x = initialX + initialSize * (Math.random() - .5);
 mNodeList[i].y = initialY + initialSize * (Math.random() - .5);
 }
 //迭代200次. Iterate 200 times.
 for (let i = 0; i < 200; i++) { 
 calculateRepulsive();
 calculateTraction();
 updateCoordinates();
 }
 json = JSON.stringify(new Result(mNodeList, mEdgeList));
 //console.log();
}
function Node(id = null) { 
 this.id = id;
 this.x = 22;
 this.y = null;
 }
 function Edge(source = null, target = null) { 
 this.source = source;
 this.target = target;
 }
/** * 计算两个Node的斥力产生的单位位移。 * Calculate the displacement generated by the repulsive force between two nodes.* */
 function calculateRepulsive() { 
 let ejectFactor = 6;
 let distX, distY, dist;
 for (let i = 0; i < mNodeList.length; i++) { 
 mDxMap[mNodeList[i].id] = 0.0;
 mDyMap[mNodeList[i].id] = 0.0;
 for (let j = 0; j < mNodeList.length; j++) { 
 if (i !== j) { 
 distX = mNodeList[i].x - mNodeList[j].x;
 distY = mNodeList[i].y - mNodeList[j].y;
 dist = Math.sqrt(distX * distX + distY * distY);
 }
 if (dist < 30) { 
 ejectFactor = 5;
 }
 if (dist > 0 && dist < 250) { 
 let id = mNodeList[i].id;
 mDxMap[id] = mDxMap[id] + distX / dist * k * k / dist * ejectFactor;
 mDyMap[id] = mDyMap[id] + distY / dist * k * k / dist * ejectFactor;
 }
 }
 }
 }
/** * 计算Edge的引力对两端Node产生的引力。 * Calculate the traction force generated by the edge acted on the two nodes of its two ends. */
 function calculateTraction() { 
 let condenseFactor =%
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