echarts BMapCoordSys 源码
echarts BMapCoordSys 代码
文件路径:/extension-src/bmap/BMapCoordSys.ts
/*
* 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.
*/
// @ts-nocheck
/* global BMap */
import {
util as zrUtil,
graphic,
matrix
} from 'echarts';
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.type = 'bmap';
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) {
const point = new BMap.Point(data[0], data[1]);
// TODO mercator projection is toooooooo slow
// let mercatorPoint = this._projection.lngLatToPoint(point);
// let width = this._api.getZr().getWidth();
// let height = this._api.getZr().getHeight();
// let 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)
// ];
const px = this._bmap.pointToOverlayPixel(point);
const mapOffset = this._mapOffset;
return [px.x - mapOffset[0], px.y - mapOffset[1]];
};
BMapCoordSys.prototype.pointToData = function (pt) {
const mapOffset = this._mapOffset;
pt = this._bmap.overlayPixelToPoint({
x: pt[0] + mapOffset[0],
y: pt[1] + mapOffset[1]
});
return [pt.lng, pt.lat];
};
BMapCoordSys.prototype.getViewRect = function () {
const api = this._api;
return new graphic.BoundingRect(0, 0, api.getWidth(), api.getHeight());
};
BMapCoordSys.prototype.getRoamTransform = function () {
return matrix.create();
};
BMapCoordSys.prototype.prepareCustoms = function () {
const 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)
}
};
};
BMapCoordSys.prototype.convertToPixel = function (ecModel, finder, value) {
// here we ignore finder as only one bmap component is allowed
return this.dataToPoint(value);
};
BMapCoordSys.prototype.convertFromPixel = function (ecModel, finder, value) {
return this.pointToData(value);
};
function dataToCoordSize(dataSize, dataItem) {
dataItem = dataItem || [0, 0];
return zrUtil.map([0, 1], function (dimIdx) {
const val = dataItem[dimIdx];
const halfSize = dataSize[dimIdx] / 2;
const p1 = [];
const 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);
}
let 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) {
let bmapCoordSys;
const root = api.getDom();
// TODO Dispose
ecModel.eachComponent('bmap', function (bmapModel) {
const painter = api.getZr().painter;
const 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');
}
let bmap;
if (!bmapModel.__bmap) {
// Not support IE8
let 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.className = 'ec-extension-bmap';
// fix #13424
bmapRoot.style.cssText = 'position:absolute;width:100%;height:100%';
root.appendChild(bmapRoot);
// initializes bmap
let mapOptions = bmapModel.get('mapOptions');
if (mapOptions) {
mapOptions = zrUtil.clone(mapOptions);
// Not support `mapType`, use `bmap.setMapType(MapType)` instead.
delete mapOptions.mapType;
}
bmap = bmapModel.__bmap = new BMap.Map(bmapRoot, mapOptions);
const overlay = new Overlay(viewportRoot);
bmap.addOverlay(overlay);
// Override
painter.getViewportRootOffset = function () {
return {offsetLeft: 0, offsetTop: 0};
};
}
bmap = bmapModel.__bmap;
// Set bmap options
// centerAndZoom before layout and render
const center = bmapModel.get('center');
const zoom = bmapModel.get('zoom');
if (center && zoom) {
const bmapCenter = bmap.getCenter();
const bmapZoom = bmap.getZoom();
const centerOrZoomChanged = bmapModel.centerOrZoomChanged([bmapCenter.lng, bmapCenter.lat], bmapZoom);
if (centerOrZoomChanged) {
const 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;
}
});
// return created coordinate systems
return bmapCoordSys && [bmapCoordSys];
};
export default BMapCoordSys;
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