描述
本例展示了如何创建一个定制图层，该图层访问来自WEB服务器的地图切片。这种方式最通用的用途是检索ArcGIS Server 9.2切片缓存或web上的其他地图切片服务。尽管本例使用的是一个ArcGIS Server 9.3服务，这仅仅是为了示范。当从9.3和更高版本时，最好使用ArcGISTileMapServiceLayer。
首先，代码声明一个继承esri.layers.TiledMapServiceLayer的定制的图层my.PortlandTiledMapServiceLayer。
dojo.declare("my.PortlandTiledMapServiceLayer", esri.layers.TiledMapServiceLayer, {...
});
接下来定义一个图层的构造函数。除空间参考和范围外，构造函数还定义了tileInfo对象。esri.layers.TileInfo包含关于缓存切片大小和比例的信息。对于ArcGIS Server服务，切片信息可以在服务的缓存目录里的缓存配置文件(conf.xml)找到，也能通过服务目录检索这个信息。对于不是ArcGIS Server切片的Web地图，需要从服务器管理员或发布切片的单位组织获得切片的大小，比例等等信息。
constructor: function() {this.spatialReference = new esri.SpatialReference(...);
this.initialExtent = (this.fullExtent = new esri.geometry.Extent(...));
...
this.tileInfo = new esri.layers.TileInfo(...);
...
this.onLoad(this);
}
最后getTileUrl方法被执行，按等级，方和列参数生成一个切片的URL。本例中，行数和列数需要转换为十六进制的并补0来获得正确的URL。定制图层的URL语法取决于访问的切片缓存的结构。
getTileUrl: function(level, row, col) {return "..." +
"L" + dojo.string.pad(level, 2, '0') + "/" +
"R" + dojo.string.pad(row.toString(16), 8, '0') + "/" +
"C" + dojo.string.pad(col.toString(16), 8, '0') + "." +
"png";
}
这个函数增加了图层到地图。
function init() { var map = new esri.Map("map");map.addLayer(new my.PortlandTiledMapServiceLayer());
}
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=7" />
<title>Shapes and Symbols</title>
<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">
<script type="text/javascript" src="http://www.tilesqh.cn/arcgis_js_api/library/1.5/arcgis/index.jsp"></script>
<script type="text/javascript">
dojo.require("esri.map");
dojo.require("esri.layers.agstiled");
dojo.require("esri.toolbars.draw"); var map, tb;
function init() {
map = new esri.Map("map");
dojo.connect(map, "onLoad", initToolbar); map.addLayer(new esri.layers.ArcGISTiledMapServiceLayer("http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer")); } function initToolbar(map) { tb = new esri.toolbars.Draw(map);
dojo.connect(tb, "onDrawEnd", addGraphic);
} function addGraphic(geometry) {
alert(222);
var symbol = dojo.byId("symbol").value;
if (symbol) {
symbol = eval(symbol);
}
else {
var type = geometry.type;
if (type === "point" || type === "multipoint") {
symbol = tb.markerSymbol;
}
else if (type === "line" || type === "polyline") {
symbol = tb.lineSymbol;
}
else {
symbol = tb.fillSymbol;
}
} map.graphics.add(new esri.Graphic(geometry, symbol));
} dojo.addOnLoad(init);
</script>
</head>
<body class="tundra">
<button onclick="tb.activate(esri.toolbars.Draw.POINT);">Point</button>
<button onclick="tb.activate(esri.toolbars.Draw.MULTI_POINT);">Multipoint</button>
<button onclick="tb.activate(esri.toolbars.Draw.EXTENT);">Extent</button>
<button onclick="tb.activate(esri.toolbars.Draw.POLYLINE);">Polyline</button>
<button onclick="tb.activate(esri.toolbars.Draw.FREEHAND_POLYLINE);">Freehand Polyline</button>
<button onclick="tb.activate(esri.toolbars.Draw.POLYGON);">Polygon</button>
<button onclick="tb.activate(esri.toolbars.Draw.FREEHAND_POLYGON);">Freehand Polygon</button>
<button onclick="tb.activate(esri.toolbars.Draw.LINE);">Line</button> <button onclick="tb.deactivate()">Deactivate</button> <select id="symbol">
<option value="">--- Select Symbol ---</option>
<option value="">--- Simple Marker Symbols ---</option>
<option value="new esri.symbol.SimpleMarkerSymbol();">Default</option>
<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>
<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>
<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>
<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>
<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>
<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>
<option value="">--- Picture Marker Symbols ---</option>
<option value="">No Default</option>
<option value="new esri.symbol.PictureMarkerSymbol('http://www.esri.com/graphics/aexicon.jpg', 51, 51)">Simple Globe</option>
<option value="new esri.symbol.PictureMarkerSymbol('http://www.esri.com/graphics/aexicon.jpg', 25, 25).setAngle(315)">Simple Globe, 25x25, 315 angle</option>
<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> <option value="">--- Simple Line Symbols ---</option>
<option value="new esri.symbol.SimpleLineSymbol();">Default</option>
<option value="new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_NONE, new dojo.Color([255,0,0]), 1)">None</option>
<option value="new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASHDOT, new dojo.Color([255,0,0]), 2)">Dash Dot</option>
<option value="new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASH, new dojo.Color([255,0,0]), 3)">Dash</option>
<option value="new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DOT, new dojo.Color([255,0,0]), 5)">Dot</option>
<option value="">--- Cartographic Line Symbols ---</option>
<option value="new esri.symbol.CartographicLineSymbol()">Default</option>
<option value="new esri.symbol.CartographicLineSymbol(esri.symbol.CartographicLineSymbol.STYLE_SOLID, new dojo.Color([255,0,0]), 10)">Solid</option>
<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>
<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>
<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>
<option value="">--- Simple Fill Symbols ---</option>
<option value="new esri.symbol.SimpleFillSymbol()">Default</option>
<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>
<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>
<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>
<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>
<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>
<option value="">--- Picture Fill Symbols ---</option>
<option value="">No Default</option>
<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>
<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>
<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>
<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>
</select> <div id="map" style="width:1024px; height:512px; border:2px solid #000;" class="tundra"></div> <br />
Zoom Slider :
<input type="button" value="Hide" onclick="map.hideZoomSlider()" />
<input type="button" value="Show" onclick="map.showZoomSlider()" /> </body class="tundra">
</html>