ArcGIS api for javascript——图形-增加图形到地图
描述
本例展示了如何使用Draw工具栏在地图上描绘许多种类的几何体。ArcGIS JavaScript API包含工具栏。
工具栏不是一个在页面上自动地可见的用户界面组件。相反，工具栏是一个助手类，可以用来让用户在地图上描绘几何体。它保存为描绘每个几何体类型而写的代码。仅仅激活需要描绘的几何体类型。本例中，每个html按钮激活一个不同的几何体类型。这是Point按钮的代码：
<button onclick="tb.activate(esri.toolbars.Draw.POINT);" ID="Button1">Point</button>
当用户点击这个按钮，工具栏激活点几何体。允许人们从一个下拉列表，一组radio按钮或一些其他组件中选择几何体的类型。
本例中，工具栏的"onDrawEnd"事件确保完成描绘一个要素后，要素可以在地图上看到：:
dojo.connect(tb, "onDrawEnd", addGraphic);
addGraphic函数为几何体类型设置适当的符号。本例中，符号从下拉列表中提供。每个列表的项目都是在一行上的符号的定义，像这样：
<option value="new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_SQUARE, 10, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([255,0,0]), 1), new dojo.Color([0,255,0,0.25]))">Square</option>
1 2 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> 3 <html> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> 6 <meta http-equiv="X-UA-Compatible" content="IE=7" /> 7 <title>Shapes and Symbols</title> 8 <link rel="stylesheet" type="text/css" href="http://www.tilesqh.cn/arcgis_js_api/library/1.5/arcgis/js/dojo/dijit/themes/tundra/tundra.css"> 9 <script type="text/javascript" src="http://www.tilesqh.cn/arcgis_js_api/library/1.5/arcgis/index.jsp"></script> 10 <script type="text/javascript"> 11 dojo.require("esri.map"); 12 dojo.require("esri.layers.agstiled"); 13 dojo.require("esri.toolbars.draw"); 14 15 16 var map, tb; 17 function init() { 18 map = new esri.Map("map"); 19 dojo.connect(map, "onLoad", initToolbar); 20 21 map.addLayer(new esri.layers.ArcGISTiledMapServiceLayer("http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer")); 22 23 } 24 25 function initToolbar(map) { 26 27 tb = new esri.toolbars.Draw(map); 28 dojo.connect(tb, "onDrawEnd", addGraphic); 29 } 30 31 function addGraphic(geometry) { 32 alert(222); 33 var symbol = dojo.byId("symbol").value; 34 if (symbol) { 35 symbol = eval(symbol); 36 } 37 else { 38 var type = geometry.type; 39 if (type === "point" || type === "multipoint") { 40 symbol = tb.markerSymbol; 41 } 42 else if (type === "line" || type === "polyline") { 43 symbol = tb.lineSymbol; 44 } 45 else { 46 symbol = tb.fillSymbol; 47 } 48 } 49 50 map.graphics.add(new esri.Graphic(geometry, symbol)); 51 } 52 53 dojo.addOnLoad(init); 54 </script> 55 </head> 56 <body class="tundra"> 57 <button onclick="tb.activate(esri.toolbars.Draw.POINT);">Point</button> 58 <button onclick="tb.activate(esri.toolbars.Draw.MULTI_POINT);">Multipoint</button> 59 <button onclick="tb.activate(esri.toolbars.Draw.EXTENT);">Extent</button> 60 <button onclick="tb.activate(esri.toolbars.Draw.POLYLINE);">Polyline</button> 61 <button onclick="tb.activate(esri.toolbars.Draw.FREEHAND_POLYLINE);">Freehand Polyline</button> 62 <button onclick="tb.activate(esri.toolbars.Draw.POLYGON);">Polygon</button> 63 <button onclick="tb.activate(esri.toolbars.Draw.FREEHAND_POLYGON);">Freehand Polygon</button> 64 <button onclick="tb.activate(esri.toolbars.Draw.LINE);">Line</button> 65 66 <button onclick="tb.deactivate()">Deactivate</button> 67 68 <select id="symbol"> 69 <option value="">--- Select Symbol ---</option> 70 <option value="">--- Simple Marker Symbols ---</option> 71 <option value="new esri.symbol.SimpleMarkerSymbol();">Default</option> 72 <option value="new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_SQUARE, 10, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([255,0,0]), 1), new dojo.Color([0,255,0,0.25]))">Square</option> 73 <option value="new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_CROSS, 50, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASH, new dojo.Color([0,0,0]), 2))">Cross, dash outline</option> 74 <option value="new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_X, 25, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DOT, new dojo.Color([0,0,255]), 2))">X, dot outline</option> 75 <option value="new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_DIAMOND, 20, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([0,0,0]), 1), new dojo.Color([255,255,0,0.5]))">Diamond</option> 76 <option value="new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_DIAMOND, 30, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([0,0,0]), 3), new dojo.Color([255,255,0,0.5])).setAngle(15)">Diamond, 15 angle</option> 77 <option value="new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_DIAMOND, 30, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([0,0,0]), 3), new dojo.Color([255,255,0,0.5])).setAngle(15).setOffset(0,5)">Diamond, 15 angle, 5 offset in Y</option> 78 <option value="">--- Picture Marker Symbols ---</option> 79 <option value="">No Default</option> 80 <option value="new esri.symbol.PictureMarkerSymbol('http://www.esri.com/graphics/aexicon.jpg', 51, 51)">Simple Globe</option> 81 <option value="new esri.symbol.PictureMarkerSymbol('http://www.esri.com/graphics/aexicon.jpg', 25, 25).setAngle(315)">Simple Globe, 25x25, 315 angle</option> 82 <option value="new esri.symbol.PictureMarkerSymbol('http://www.esri.com/graphics/aexicon.jpg', 51, 25).setAngle(315).setOffset(10,0)">Simple Globe, 25x25, 315 angle, 10 offsetx</option> 83 84 <option value="">--- Simple Line Symbols ---</option> 85 <option value="new esri.symbol.SimpleLineSymbol();">Default</option> 86 <option value="new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_NONE, new dojo.Color([255,0,0]), 1)">None</option> 87 <option value="new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASHDOT, new dojo.Color([255,0,0]), 2)">Dash Dot</option> 88 <option value="new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASH, new dojo.Color([255,0,0]), 3)">Dash</option> 89 <option value="new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DOT, new dojo.Color([255,0,0]), 5)">Dot</option> 90 <option value="">--- Cartographic Line Symbols ---</option> 91 <option value="new esri.symbol.CartographicLineSymbol()">Default</option> 92 <option value="new esri.symbol.CartographicLineSymbol(esri.symbol.CartographicLineSymbol.STYLE_SOLID, new dojo.Color([255,0,0]), 10)">Solid</option> 93 <option value="new esri.symbol.CartographicLineSymbol(esri.symbol.CartographicLineSymbol.STYLE_SOLID, new dojo.Color([255,0,0]), 10, esri.symbol.CartographicLineSymbol.CAP_ROUND, esri.symbol.CartographicLineSymbol.JOIN_ROUND)">Solid, round cap, round join</option> 94 <option value="new esri.symbol.CartographicLineSymbol(esri.symbol.CartographicLineSymbol.STYLE_SOLID, new dojo.Color([255,0,0]), 10, esri.symbol.CartographicLineSymbol.CAP_SQUARE, esri.symbol.CartographicLineSymbol.JOIN_BEVEL)">Solid, square cap, bevel join</option> 95 <option value="new esri.symbol.CartographicLineSymbol(esri.symbol.CartographicLineSymbol.STYLE_SOLID, new dojo.Color([255,0,0]), 10, esri.symbol.CartographicLineSymbol.CAP_ROUND, esri.symbol.CartographicLineSymbol.JOIN_MITER, 5)">Solid, round cap, miter (5) join</option> 96 <option value="">--- Simple Fill Symbols ---</option> 97 <option value="new esri.symbol.SimpleFillSymbol()">Default</option> 98 <option value="new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_NONE, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASHDOT, new dojo.Color([255,0,0]), 2), new dojo.Color([255,255,0,0.25]))">None</option> 99 <option value="new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASHDOT, new dojo.Color([255,0,0]), 2), new dojo.Color([255,255,0,0.5]))">Solid</option> 100 <option value="new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_HORIZONTAL, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASHDOT, new dojo.Color([255,0,0]), 2), new dojo.Color([255,255,0,0.25]))">Horizontal</option> 101 <option value="new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_FORWARDDIAGONAL, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASHDOT, new dojo.Color([255,0,0]), 2), new dojo.Color([255,255,0,0.25]))">Forward diagonal</option> 102 <option value="new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_DIAGONALCROSS, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASHDOT, new dojo.Color([255,0,0]), 2), new dojo.Color([255,255,0,0.25]))">Diagonal cross</option> 103 <option value="">--- Picture Fill Symbols ---</option> 104 <option value="">No Default</option> 105 <option value="new esri.symbol.PictureFillSymbol('images/sand.png', new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color('#000'), 1), 42, 42)">Sand</option> 106 <option value="new esri.symbol.PictureFillSymbol('images/mangrove.png', new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color('#000'), 1), 42, 42)">Mangrove</option> 107 <option value="new esri.symbol.PictureFillSymbol('images/swamp.png', new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color('#000'), 1), 42, 42)">Swamp</option> 108 <option value="new esri.symbol.PictureFillSymbol('images/stiple.png', new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color('#000'), 1), 42, 42)">Ordered 10% Stiple</option> 109 </select> 110 111 <div id="map" style="width:1024px; height:512px; border:2px solid #000;" class="tundra"></div> 112 113 <br /> 114 Zoom Slider : 115 <input type="button" value="Hide" onclick="map.hideZoomSlider()" /> 116 <input type="button" value="Show" onclick="map.showZoomSlider()" /> 117 118 </body class="tundra"> 119 </html> 120 121 122 123
