BMapCoordSys.js

var _echarts = require("echarts");

var zrUtil = _echarts.util;
var graphic = _echarts.graphic;
var matrix = _echarts.matrix;

/*
* 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.
*/

/* global BMap */
function BMapCoordSys(bmap, api) {
  this._bmap = bmap;
  this.dimensions = ['lng', 'lat'];
  this._mapOffset = [0, 0];
  this._api = api;
  this._projection = new BMap.MercatorProjection();
}

BMapCoordSys.prototype.dimensions = ['lng', 'lat'];

BMapCoordSys.prototype.setZoom = function (zoom) {
  this._zoom = zoom;
};

BMapCoordSys.prototype.setCenter = function (center) {
  this._center = this._projection.lngLatToPoint(new BMap.Point(center[0], center[1]));
};

BMapCoordSys.prototype.setMapOffset = function (mapOffset) {
  this._mapOffset = mapOffset;
};

BMapCoordSys.prototype.getBMap = function () {
  return this._bmap;
};

BMapCoordSys.prototype.dataToPoint = function (data) {
  var point = new BMap.Point(data[0], data[1]); // TODO mercator projection is toooooooo slow
  // var mercatorPoint = this._projection.lngLatToPoint(point);
  // var width = this._api.getZr().getWidth();
  // var height = this._api.getZr().getHeight();
  // var divider = Math.pow(2, 18 - 10);
  // return [
  //     Math.round((mercatorPoint.x - this._center.x) / divider + width / 2),
  //     Math.round((this._center.y - mercatorPoint.y) / divider + height / 2)
  // ];

  var px = this._bmap.pointToOverlayPixel(point);

  var mapOffset = this._mapOffset;
  return [px.x - mapOffset[0], px.y - mapOffset[1]];
};

BMapCoordSys.prototype.pointToData = function (pt) {
  var mapOffset = this._mapOffset;

  var pt = this._bmap.overlayPixelToPoint({
    x: pt[0] + mapOffset[0],
    y: pt[1] + mapOffset[1]
  });

  return [pt.lng, pt.lat];
};

BMapCoordSys.prototype.getViewRect = function () {
  var api = this._api;
  return new graphic.BoundingRect(0, 0, api.getWidth(), api.getHeight());
};

BMapCoordSys.prototype.getRoamTransform = function () {
  return matrix.create();
};

BMapCoordSys.prototype.prepareCustoms = function (data) {
  var rect = this.getViewRect();
  return {
    coordSys: {
      // The name exposed to user is always 'cartesian2d' but not 'grid'.
      type: 'bmap',
      x: rect.x,
      y: rect.y,
      width: rect.width,
      height: rect.height
    },
    api: {
      coord: zrUtil.bind(this.dataToPoint, this),
      size: zrUtil.bind(dataToCoordSize, this)
    }
  };
};

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);
}

var Overlay; // For deciding which dimensions to use when creating list data

BMapCoordSys.dimensions = BMapCoordSys.prototype.dimensions;

function createOverlayCtor() {
  function Overlay(root) {
    this._root = root;
  }

  Overlay.prototype = new BMap.Overlay();
  /**
   * 初始化
   *
   * @param {BMap.Map} map
   * @override
   */

  Overlay.prototype.initialize = function (map) {
    map.getPanes().labelPane.appendChild(this._root);
    return this._root;
  };
  /**
   * @override
   */


  Overlay.prototype.draw = function () {};

  return Overlay;
}

BMapCoordSys.create = function (ecModel, api) {
  var bmapCoordSys;
  var root = api.getDom(); // TODO Dispose

  ecModel.eachComponent('bmap', function (bmapModel) {
    var painter = api.getZr().painter;
    var viewportRoot = painter.getViewportRoot();

    if (typeof BMap === 'undefined') {
      throw new Error('BMap api is not loaded');
    }

    Overlay = Overlay || createOverlayCtor();

    if (bmapCoordSys) {
      throw new Error('Only one bmap component can exist');
    }

    if (!bmapModel.__bmap) {
      // Not support IE8
      var bmapRoot = root.querySelector('.ec-extension-bmap');

      if (bmapRoot) {
        // Reset viewport left and top, which will be changed
        // in moving handler in BMapView
        viewportRoot.style.left = '0px';
        viewportRoot.style.top = '0px';
        root.removeChild(bmapRoot);
      }

      bmapRoot = document.createElement('div');
      bmapRoot.style.cssText = 'width:100%;height:100%'; // Not support IE8

      bmapRoot.classList.add('ec-extension-bmap');
      root.appendChild(bmapRoot);
      var bmap = bmapModel.__bmap = new BMap.Map(bmapRoot);
      var overlay = new Overlay(viewportRoot);
      bmap.addOverlay(overlay); // Override

      painter.getViewportRootOffset = function () {
        return {
          offsetLeft: 0,
          offsetTop: 0
        };
      };
    }

    var bmap = bmapModel.__bmap; // Set bmap options
    // centerAndZoom before layout and render

    var center = bmapModel.get('center');
    var zoom = bmapModel.get('zoom');

    if (center && zoom) {
      var pt = new BMap.Point(center[0], center[1]);
      bmap.centerAndZoom(pt, zoom);
    }

    bmapCoordSys = new BMapCoordSys(bmap, api);
    bmapCoordSys.setMapOffset(bmapModel.__mapOffset || [0, 0]);
    bmapCoordSys.setZoom(zoom);
    bmapCoordSys.setCenter(center);
    bmapModel.coordinateSystem = bmapCoordSys;
  });
  ecModel.eachSeries(function (seriesModel) {
    if (seriesModel.get('coordinateSystem') === 'bmap') {
      seriesModel.coordinateSystem = bmapCoordSys;
    }
  });
};

var _default = BMapCoordSys;
module.exports = _default;