en/builder/src/echarts3/chart/tree/commonLayout.js

import { eachAfter, eachBefore } from './traversalHelper';
import { init, firstWalk, secondWalk, separation as sep, radialCoordinate, getViewRect } from './layoutHelper';
export default function (seriesModel, api) {
  var layoutInfo = getViewRect(seriesModel, api);
  seriesModel.layoutInfo = layoutInfo;
  var layout = seriesModel.get('layout');
  var width = 0;
  var height = 0;
  var separation = null;

  if (layout === 'radial') {
    width = 2 * Math.PI;
    height = Math.min(layoutInfo.height, layoutInfo.width) / 2;
    separation = sep(function (node1, node2) {
      return (node1.parentNode === node2.parentNode ? 1 : 2) / node1.depth;
    });
  } else {
    width = layoutInfo.width;
    height = layoutInfo.height;
    separation = sep();
  }

  var virtualRoot = seriesModel.getData().tree.root;
  var realRoot = virtualRoot.children[0];
  init(virtualRoot);
  eachAfter(realRoot, firstWalk, separation);
  virtualRoot.hierNode.modifier = -realRoot.hierNode.prelim;
  eachBefore(realRoot, secondWalk);
  var left = realRoot;
  var right = realRoot;
  var bottom = realRoot;
  eachBefore(realRoot, function (node) {
    var x = node.getLayout().x;

    if (x < left.getLayout().x) {
      left = node;
    }

    if (x > right.getLayout().x) {
      right = node;
    }

    if (node.depth > bottom.depth) {
      bottom = node;
    }
  });
  var delta = left === right ? 1 : separation(left, right) / 2;
  var tx = delta - left.getLayout().x;
  var kx = 0;
  var ky = 0;
  var coorX = 0;
  var coorY = 0;

  if (layout === 'radial') {
    kx = width / (right.getLayout().x + delta + tx); // here we use (node.depth - 1), bucause the real root's depth is 1

    ky = height / (bottom.depth - 1 || 1);
    eachBefore(realRoot, function (node) {
      coorX = (node.getLayout().x + tx) * kx;
      coorY = (node.depth - 1) * ky;
      var finalCoor = radialCoordinate(coorX, coorY);
      node.setLayout({
        x: finalCoor.x,
        y: finalCoor.y,
        rawX: coorX,
        rawY: coorY
      }, true);
    });
  } else {
    if (seriesModel.get('orient') === 'horizontal') {
      ky = height / (right.getLayout().x + delta + tx);
      kx = width / (bottom.depth - 1 || 1);
      eachBefore(realRoot, function (node) {
        coorY = (node.getLayout().x + tx) * ky;
        coorX = (node.depth - 1) * kx;
        node.setLayout({
          x: coorX,
          y: coorY
        }, true);
      });
    } else {
      kx = width / (right.getLayout().x + delta + tx);
      ky = height / (bottom.depth - 1 || 1);
      eachBefore(realRoot, function (node) {
        coorX = (node.getLayout().x + tx) * kx;
        coorY = (node.depth - 1) * ky;
        node.setLayout({
          x: coorX,
          y: coorY
        }, true);
      });
    }
  }
}