en/builder/src/echarts3/coord/geo/prepareCustom.js

import * as zrUtil from 'zrender/src/core/util';

function dataToCoordSize(dataSize, dataItem) {
  dataItem = dataItem || [0, 0];
  return zrUtil.map([0, 1], function (dimIdx) {
    var val = dataItem[dimIdx];
    var halfSize = dataSize[dimIdx] / 2;
    var p1 = [];
    var p2 = [];
    p1[dimIdx] = val - halfSize;
    p2[dimIdx] = val + halfSize;
    p1[1 - dimIdx] = p2[1 - dimIdx] = dataItem[1 - dimIdx];
    return Math.abs(this.dataToPoint(p1)[dimIdx] - this.dataToPoint(p2)[dimIdx]);
  }, this);
}

export default function (coordSys) {
  var rect = coordSys.getBoundingRect();
  return {
    coordSys: {
      type: 'geo',
      x: rect.x,
      y: rect.y,
      width: rect.width,
      height: rect.height
    },
    api: {
      coord: zrUtil.bind(coordSys.dataToPoint, coordSys),
      size: zrUtil.bind(dataToCoordSize, coordSys)
    }
  };
}