public/en/builder/src/echarts/chart/graph/adjustEdge.js

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import * as curveTool from 'zrender/src/core/curve';
import * as vec2 from 'zrender/src/core/vector';
import { getSymbolSize } from './graphHelper';
var v1 = [];
var v2 = [];
var v3 = [];
var quadraticAt = curveTool.quadraticAt;
var v2DistSquare = vec2.distSquare;
var mathAbs = Math.abs;

function intersectCurveCircle(curvePoints, center, radius) {
  var p0 = curvePoints[0];
  var p1 = curvePoints[1];
  var p2 = curvePoints[2];
  var d = Infinity;
  var t;
  var radiusSquare = radius * radius;
  var interval = 0.1;

  for (var _t = 0.1; _t <= 0.9; _t += 0.1) {
    v1[0] = quadraticAt(p0[0], p1[0], p2[0], _t);
    v1[1] = quadraticAt(p0[1], p1[1], p2[1], _t);
    var diff = mathAbs(v2DistSquare(v1, center) - radiusSquare);

    if (diff < d) {
      d = diff;
      t = _t;
    }
  } // Assume the segment is monotone，Find root through Bisection method
  // At most 32 iteration


  for (var i = 0; i < 32; i++) {
    // var prev = t - interval;
    var next = t + interval; // v1[0] = quadraticAt(p0[0], p1[0], p2[0], prev);
    // v1[1] = quadraticAt(p0[1], p1[1], p2[1], prev);

    v2[0] = quadraticAt(p0[0], p1[0], p2[0], t);
    v2[1] = quadraticAt(p0[1], p1[1], p2[1], t);
    v3[0] = quadraticAt(p0[0], p1[0], p2[0], next);
    v3[1] = quadraticAt(p0[1], p1[1], p2[1], next);
    var diff = v2DistSquare(v2, center) - radiusSquare;

    if (mathAbs(diff) < 1e-2) {
      break;
    } // var prevDiff = v2DistSquare(v1, center) - radiusSquare;


    var nextDiff = v2DistSquare(v3, center) - radiusSquare;
    interval /= 2;

    if (diff < 0) {
      if (nextDiff >= 0) {
        t = t + interval;
      } else {
        t = t - interval;
      }
    } else {
      if (nextDiff >= 0) {
        t = t - interval;
      } else {
        t = t + interval;
      }
    }
  }

  return t;
} // Adjust edge to avoid


export default function (graph, scale) {
  var tmp0 = [];
  var quadraticSubdivide = curveTool.quadraticSubdivide;
  var pts = [[], [], []];
  var pts2 = [[], []];
  var v = [];
  scale /= 2;
  graph.eachEdge(function (edge, idx) {
    var linePoints = edge.getLayout();
    var fromSymbol = edge.getVisual('fromSymbol');
    var toSymbol = edge.getVisual('toSymbol');

    if (!linePoints.__original) {
      linePoints.__original = [vec2.clone(linePoints[0]), vec2.clone(linePoints[1])];

      if (linePoints[2]) {
        linePoints.__original.push(vec2.clone(linePoints[2]));
      }
    }

    var originalPoints = linePoints.__original; // Quadratic curve

    if (linePoints[2] != null) {
      vec2.copy(pts[0], originalPoints[0]);
      vec2.copy(pts[1], originalPoints[2]);
      vec2.copy(pts[2], originalPoints[1]);

      if (fromSymbol && fromSymbol !== 'none') {
        var symbolSize = getSymbolSize(edge.node1);
        var t = intersectCurveCircle(pts, originalPoints[0], symbolSize * scale); // Subdivide and get the second

        quadraticSubdivide(pts[0][0], pts[1][0], pts[2][0], t, tmp0);
        pts[0][0] = tmp0[3];
        pts[1][0] = tmp0[4];
        quadraticSubdivide(pts[0][1], pts[1][1], pts[2][1], t, tmp0);
        pts[0][1] = tmp0[3];
        pts[1][1] = tmp0[4];
      }

      if (toSymbol && toSymbol !== 'none') {
        var symbolSize = getSymbolSize(edge.node2);
        var t = intersectCurveCircle(pts, originalPoints[1], symbolSize * scale); // Subdivide and get the first

        quadraticSubdivide(pts[0][0], pts[1][0], pts[2][0], t, tmp0);
        pts[1][0] = tmp0[1];
        pts[2][0] = tmp0[2];
        quadraticSubdivide(pts[0][1], pts[1][1], pts[2][1], t, tmp0);
        pts[1][1] = tmp0[1];
        pts[2][1] = tmp0[2];
      } // Copy back to layout


      vec2.copy(linePoints[0], pts[0]);
      vec2.copy(linePoints[1], pts[2]);
      vec2.copy(linePoints[2], pts[1]);
    } // Line
    else {
        vec2.copy(pts2[0], originalPoints[0]);
        vec2.copy(pts2[1], originalPoints[1]);
        vec2.sub(v, pts2[1], pts2[0]);
        vec2.normalize(v, v);

        if (fromSymbol && fromSymbol !== 'none') {
          var symbolSize = getSymbolSize(edge.node1);
          vec2.scaleAndAdd(pts2[0], pts2[0], v, symbolSize * scale);
        }

        if (toSymbol && toSymbol !== 'none') {
          var symbolSize = getSymbolSize(edge.node2);
          vec2.scaleAndAdd(pts2[1], pts2[1], v, -symbolSize * scale);
        }

        vec2.copy(linePoints[0], pts2[0]);
        vec2.copy(linePoints[1], pts2[1]);
      }
  });
}