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守望屁股实在太好玩了,所以最近有点懒,这次就先写个简单的来凑一下数。这次我的模仿目标是天地图的地图联动。
天地的地图联动不仅地图有联动,而且鼠标也有联动,我就照着这个目标进行山寨。
地图联动其实就是当一张的extent发生了变化,另一张图的extent也要同步变化,这样就可以两张图的范围同步了。同理,这样就可以扩展到N张图进行联动。所以这次的目标就是实现添加任意的地图都要可以联动。首先依然是先看一下官方文档。找到有用的方法或者事件。
整体的难点在于如何判断主地图(有鼠标动作的地图),通过官方文档,我们可以利用mouse-over事件来进行主地图的判断,在添加地图时,监听每张地图的mouse-over事件。
1 //添加地图,相互联动 2 addMap: function (map) { 3 var self = this; 4 if (this._maps.indexOf(map) != -1)return;//如果已经在联动地图集合就不添加 5 var graphicLayer=new GraphicLayer({id:"mapLinkagerLayer"}); 6 var mouseHandler= map.on("mouse-over", function (evt) {//鼠标在哪个地图上,该地图就是激活地图 7 self.activeMap = map; 8 self. _clearActiveMapEvents(); 9 self._bindActiveMapEvents(); 10 }); 11 12 var graphic=new Graphic(); 13 graphic.setSymbol(this.mouseSymbol); 14 map.addLayer(graphicLayer); 15 graphicLayer.add(graphic) 16 17 this._maps.push(map); 18 this._mapMouseOverEventHandlers.push(mouseHandler); 19 this._mouseGraphicLayers.push(graphicLayer); 20 this._mouseGraphics.push(graphic); 21 }, 22
这里self. _clearActiveMapEvents()就是清除上一个主地图的相关事件;在清除上一个的事件后利用self._bindActiveMapEvents()对当前地图进行事件的绑定。这两个方法的具体内容我会在后面详细介绍。graphicLayer就是为了实现鼠标联动。
1 //清除当前地图联动事件 2 _clearActiveMapEvents: function () { 3 this._activeMapEventHandlers.forEach(function (eventHandler) { 4 eventHandler.remove(); 5 }); 6 this._activeMapEventHandlers = []; 7 },
这里我们先清除上一个主地图的所有事件,我把这些事件都放到this._activeMapEventHandlers集合中。
1 //为当前地图添加联动 2 _bindActiveMapEvents: function () { 3 var self = this; 4 //放大联动 5 this._activeMapEventHandlers.push(this.activeMap.on("zoom-end", function (evt) { 6 self._maps.forEach(function (map) { 7 if (map != self.activeMap) { 8 map.setExtent(evt.extent); 9 } 10 }); 11 })); 12 //平移联动 13 this._activeMapEventHandlers.push(this.activeMap.on("pan-end", function (evt) { 14 self._maps.forEach(function (map) { 15 if (map != self.activeMap) { 16 map.setExtent(evt.extent); 17 } 18 }); 19 })); 20 21 //鼠标联动 22 this._activeMapEventHandlers.push(this.activeMap.on("mouse-move", function (evt) { 23 self._maps.forEach(function (map) { 24 var idx = self._maps.indexOf(map); 25 var graphicLayer=map.getLayer("mapLinkagerLayer") 26 var graphic=self._mouseGraphics[idx]; 27 if (map != self.activeMap) { 28 graphicLayer.show(); 29 graphic.setGeometry(evt.mapPoint); 30 }else{ 31 graphicLayer.hide();//激活地图不显示联动鼠标 32 } 33 }); 34 })); 35 } 36 });
在主地图平移和放大后,通过遍历_maps 集合,并利用事件提供的extent参数和map.setExtent()方法来设置地图的联动。鼠标的联动则是通过监听mouse-move事件,获取事件中的mapPoint参数来进行鼠标Graphic的定位。至此核心的部分已经全部完成了。
源码:
1 /** 2 * Created by Extra
3 * 地图联动辅助类 4 * version:v1.0.0 5 */ 6 define("dextra/modules/MapLinkager", [ 7 "dojo/_base/declare", 8 "esri/layers/GraphicsLayer", 9 "esri/graphic", 10 "esri/symbols/SimpleMarkerSymbol" 11 ], function ( declare,GraphicLayer,Graphic,SimpleMarkerSymbol) { 12 var maplinkager = declare(null, { 13 declaredClass: "dextra.modules.MapLinkager", 14 _maps: null,//参与联动的地图控件集合 15 _activeMapEventHandlers: null,//当前鼠标所在地图事件集合 16 _mapMouseOverEventHandlers:null,//所有地图mouse-over事件集合 17 _mouseGraphicLayers:null,//鼠标联动GraphicLayer 18 activeMap: null,//当前激活地图 19 mouseSymbol:null,//鼠标样式 20 _mouseGraphics:null,//鼠标Graphic集合 21 22 constructor: function () { 23 this._maps = []; 24 this._activeMapEventHandlers=[]; 25 this._mapMouseOverEventHandlers=[]; 26 this._mouseGraphicLayers=[]; 27 this.mouseSymbol=new SimpleMarkerSymbol({ 28 "color": [255,0,0], 29 "size": 10, 30 "xoffset": 0, 31 "yoffset": 0, 32 "type": "esriSMS", 33 "style": "esriSMSCircle", 34 "outline": { 35 "color": [255,0,0], 36 "width": 1, 37 "type": "esriSLS", 38 "style": "esriSLSSolid" 39 } 40 }); 41 this._mouseGraphics=[]; 42 43 }, 44 45 //添加地图,相互联动 46 addMap: function (map) { 47 var self = this; 48 if (this._maps.indexOf(map) != -1)return;//如果已经在联动地图集合就不添加 49 var graphicLayer=new GraphicLayer({id:"mapLinkagerLayer"}); 50 var mouseHandler= map.on("mouse-over", function (evt) {//鼠标在哪个地图上,该地图就是激活地图 51 self.activeMap = map; 52 self. _clearActiveMapEvents(); 53 self._bindActiveMapEvents(); 54 }); 55 56 var graphic=new Graphic(); 57 graphic.setSymbol(this.mouseSymbol); 58 map.addLayer(graphicLayer); 59 graphicLayer.add(graphic) 60 61 this._maps.push(map); 62 this._mapMouseOverEventHandlers.push(mouseHandler); 63 this._mouseGraphicLayers.push(graphicLayer); 64 this._mouseGraphics.push(graphic); 65 }, 66 67 //移除地图,取消联动 68 removeMap: function (map) { 69 var idx = this._maps.indexOf(map); 70 this._maps.splice(idx, 1); 71 var graphicLayer= this._mouseGraphicLayers.splice(idx, 1)[0]; 72 graphicLayer.clear(); 73 map.removeLayer(graphicLayer); 74 75 this._mapMouseOverEventHandlers[idx].remove(); 76 this._mapMouseOverEventHandlers.splice(idx, 1); 77 this._mouseGraphics.splice(idx, 1); 78 this._clearActiveMapEvents(); 79 80 }, 81 82 //清除当前地图联动事件 83 _clearActiveMapEvents: function () { 84 this._activeMapEventHandlers.forEach(function (eventHandler) { 85 eventHandler.remove(); 86 }); 87 this._activeMapEventHandlers = []; 88 }, 89 90 //为当前地图添加联动 91 _bindActiveMapEvents: function () { 92 var self = this; 93 //放大联动 94 this._activeMapEventHandlers.push(this.activeMap.on("zoom-end", function (evt) { 95 self._maps.forEach(function (map) { 96 if (map != self.activeMap) { 97 map.setExtent(evt.extent); 98 } 99 }); 100 })); 101 //平移联动 102 this._activeMapEventHandlers.push(this.activeMap.on("pan-end", function (evt) { 103 self._maps.forEach(function (map) { 104 if (map != self.activeMap) { 105 map.setExtent(evt.extent); 106 } 107 }); 108 })); 109 110 //鼠标联动 111 this._activeMapEventHandlers.push(this.activeMap.on("mouse-move", function (evt) { 112 self._maps.forEach(function (map) { 113 var idx = self._maps.indexOf(map); 114 var graphicLayer=map.getLayer("mapLinkagerLayer") 115 var graphic=self._mouseGraphics[idx]; 116 if (map != self.activeMap) { 117 graphicLayer.show(); 118 graphic.setGeometry(evt.mapPoint); 119 }else{ 120 graphicLayer.hide();//激活地图不显示联动鼠标 121 } 122 }); 123 })); 124 } 125 }); 126 127 return maplinkager; 128 });
DEMO:
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>DExtra-HeatMap</title> 6 <link rel="stylesheet" href="https://js.arcgis.com/3.16/esri/css/esri.css"> 7 <style> 8 html, body, #map { 9 padding: 0; 10 margin: 0; 11 height: 100%; 12 } 13 </style> 14 <script> 15 var dojoConfig = { 16 parseOnLoad: true, 17 packages: [{ 18 name: ‘custom‘, 19 location: location.pathname.replace(/\/[^/]+$/, ‘‘) + ‘/custom‘//从cdn加载自己定义的模块方法 20 }, 21 { 22 name: ‘dextra‘, 23 location: ‘/extra.arcgis.3.x/dist/‘//从cdn加载自己定义的模块方法 24 }] 25 }; 26 console.log(location.pathname.replace(/\/[^/]+$/, ‘‘)); 27 </script> 28 29 <script src="https://js.arcgis.com/3.16/"></script> 30 31 <script> 32 require([ 33 "dojo/_base/array", 34 "dojo/on","dojo/dom", 35 "esri/map", 36 "esri/geometry/Point", 37 "dextra/layers/GoogleVectorLayer", 38 "dextra/layers/GoogleImageLayer", 39 "dextra/layers/GoogleTerrienLayer", 40 "dextra/modules/MapLinkager", 41 "dojo/domReady!"], function (array,on,dom,Map, Point, GoogleVectorLayer, GoogleImageLayer,GoogleTerrienLayer,MapLinkager) { 42 var map1 = new Map("map1", { 43 center: [102.8, 25.1], 44 zoom: 10, 45 }); 46 var googleVecLayer = new GoogleVectorLayer(); 47 map1.addLayer(googleVecLayer); 48 49 50 var map2 = new Map("map2", { 51 center: [102.8, 25.1], 52 zoom: 10, 53 }); 54 var googleimageLayer = new GoogleImageLayer(); 55 map2.addLayer(googleimageLayer); 56 57 var map3 = new Map("map3", { 58 center: [102.8, 25.1], 59 zoom: 10, 60 }); 61 var googleterrienLayer = new GoogleTerrienLayer(); 62 map3.addLayer(googleterrienLayer); 63 64 var mapLinker=new MapLinkager(); 65 mapLinker.addMap(map1); 66 mapLinker.addMap(map2); 67 mapLinker.addMap(map3); 68 69 70 on(dom.byId("btn1"),"click",function(evt){ 71 mapLinker.removeMap(map1); 72 }) 73 on(dom.byId("btn2"),"click",function(evt){ 74 mapLinker.removeMap(map2); 75 }) 76 77 on(dom.byId("btn3"),"click",function(evt){ 78 mapLinker.removeMap(map3); 79 }); 80 81 on(dom.byId("btn4"),"click",function(evt){ 82 mapLinker.addMap(map1); 83 }); 84 on(dom.byId("btn5"),"click",function(evt){ 85 mapLinker.addMap(map2); 86 }) 87 on(dom.byId("btn6"),"click",function(evt){ 88 mapLinker.addMap(map3); 89 }) 90 }); 91 92 93 </script> 94 </head> 95 <body> 96 <button id="btn1">Remove Map1</button> 97 <button id="btn2">Remove Map2</button> 98 <button id="btn3">Remove Map3</button> 99 100 <button id="btn4">Add Map1</button> 101 <button id="btn5">Add Map2</button> 102 <button id="btn6">Add Map3</button> 103 104 105 <div id="map1" style="width:49%;float:left"></div> 106 <div id="map2" style="width:49%; float:right"></div> 107 <div id="map3" style="width:49%; "></div> 108 </body> 109 </html>
有图有真相:
demo的布局就请不要吐槽了。。。求放过。。。。
欢迎转载 http://www.cnblogs.com/deliciousExtra/p/5600212.html
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原文地址:http://www.cnblogs.com/deliciousExtra/p/5600212.html