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南沙政府应急系统之GIS一张图（arcgis api for flex）讲解（三）
config.xml文件的配置如下：
12 <widget left="3" bottom="3"config="widgets/Coordinate/CoordinateWidget.xml" url="widgets/Coordinate/CoordinateWidget.swf" /> 源代码目录如下： 
地图坐标系模块的源代码原理解析，详细的代码在下载的开源flexviewer自带的： （1）CoordinateWidget.xml <?xml version="1.0" ?> <configuration label="Coordinates (default)"> <!-- geo, dms, mercator 主要是坐标输出单位，默认的是经纬度 --> <outputunit>geo</outputunit> </configuration> (2)CoordinateWidget.mxml <?xml version="1.0" encoding="utf-8"?> <viewer:BaseWidget xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" xmlns:viewer="com.esri.viewer.*" layout="horizontal" widgetConfigLoaded="basewidget_widgetConfigLoadedHandler(event)"> <fx:Script> <![CDATA[ import com.esri.ags.events.MapEvent; import com.esri.ags.geometry.MapPoint; import com.esri.ags.utils.WebMercatorUtil; import mx.formatters.NumberBaseRoundType; import mx.utils.StringUtil; private var m_template:String; private var m_func:Function = substitute; protected function basewidget_widgetConfigLoadedHandler(event:Event):void { if (configXML) { //下面是读取CoordinateWidget.xml配置文件的资源，要是配置了的话 const decimalSeparator:String = configXML.numberformatter.@decimalseparator; numberFormatter.decimalSeparatorTo = decimalSeparator ? decimalSeparator : "."; const thousandsSeparator:String = configXML.numberformatter.@thousandsseparator; numberFormatter.thousandsSeparatorTo = thousandsSeparator ? thousandsSeparator : ","; numberFormatter.useThousandsSeparator = configXML.numberformatter.@usethousandsseparator == "true"; numberFormatter.precision = parseFloat(configXML.numberformatter.@precision || "-1"); const rounding:String = configXML.numberformatter.@rounding; numberFormatter.rounding = rounding ? rounding : NumberBaseRoundType.NONE; //获取设置坐标显示的字体和颜色样式等 const color:String = configXML.labelstyle.@color[0] || configXML.label.@color[0]; coords.setStyle("color", toNumber(color ? color : "0x000000")); const fontFamily:String = configXML.labelstyle.@fontfamily[0] || configXML.label.@fontfamily[0]; coords.setStyle("fontFamily", fontFamily ? fontFamily : "Verdana"); const fontSize:String = configXML.labelstyle.@fontsize[0] || configXML.label.@fontsize[0]; coords.setStyle("fontSize", parseInt(fontSize ? fontSize : "9")); const fontWeight:String = configXML.labelstyle.@fontweight[0] || configXML.label.@fontweight[0]; coords.setStyle("fontWeight", fontWeight ? fontWeight : "bold"); // If no template specified, show them with a space in between (except for special case below) m_template = configXML.labels.template[0] || configXML.label.@template[0] || "{0} {1}"; if (map.loaded) { map_loadHandler(null); } else { map.addEventListener(MapEvent.LOAD, map_loadHandler);//加载地图 } } function map_loadHandler(event:MapEvent):void { map.removeEventListener(MapEvent.LOAD, map_loadHandler); const wkid:int = map.spatialReference.wkid; //获取地图的空间坐标参考系 m_func = substitute; const outputUnit:String = configXML.outputunit;//获取地图的坐标显示单位，从配置文件获取 if (outputUnit === "mercator")//判断地图的坐标体系，墨卡托情况下执行 { if (wkid === 4326 || wkid === 4269 || wkid === 4267) { m_func = geographicToMercator;//调用地理坐标系转换墨卡托坐标系 } } else if (outputUnit === "geo")//地理坐标系情况下执行 { if (wkid === 102100 || wkid === 102113 || wkid === 3857) { m_func = mercatorToGeographic;//调用墨卡托坐标系转换地理坐标系 // special default for geographic outputs m_template = configXML.labels.template[0] || configXML.label.@template[0] || getDefaultString("latitudeLabel") + ":{1} " + getDefaultString("longitudeLabel") + ":{0}";//设置坐标显示的文字，比如经度，纬度 numberFormatter.precision = parseFloat(configXML.numberformatter.@precision || "6");//设置坐标显示的位数 } else if (wkid === 4326 || wkid === 4269 || wkid === 4267) { // special default for geographic outputs m_template = configXML.labels.template[0] || configXML.label.@template[0] || getDefaultString("latitudeLabel") + ":{1} " + getDefaultString("longitudeLabel") + ":{0}"; numberFormatter.precision = parseFloat(configXML.numberformatter.@precision || "6"); } } else if (outputUnit === "dms")//经纬度显示单位为度分秒形式情况下执行 { if (wkid === 102100 || wkid === 102113 || wkid === 3857) { m_func = mercatorToDMS; } else if (wkid === 4326 || wkid === 4269 || wkid === 4267) { m_func = geographicToDMS; } } map.addEventListener(MouseEvent.MOUSE_MOVE, map_mouseMoveHandler);//监听地图鼠标移动事件，用来获取地图经纬度的 } } private function toNumber(value:String):int//转换单位计算 { if (value.substr(0, 2) == "0x") { return parseInt(value, 16); } return parseInt(value, 10); } private function mercatorToGeographic(web:MapPoint):String//墨卡托转换地理坐标系的函数 { const geo:MapPoint = WebMercatorUtil.webMercatorToGeographic(web) as MapPoint;//arcgis api封装好的转换函数 return StringUtil.substitute(m_template, numberFormatter.format(geo.x), numberFormatter.format(geo.y)); } private function mercatorToDMS(web:MapPoint):String//墨卡托转换经纬度度分秒形式的函数 { const geo:MapPoint = WebMercatorUtil.webMercatorToGeographic(web) as MapPoint; return StringUtil.substitute(m_template, DegToDMS.format(geo.x, DegToDMS.LON), DegToDMS.format(geo.y, DegToDMS.LAT)); } private function geographicToMercator(geo:MapPoint):String//地理坐标系转换墨卡托的函数 { const web:MapPoint = WebMercatorUtil.geographicToWebMercator(geo) as MapPoint; return StringUtil.substitute(m_template, numberFormatter.format(web.x), numberFormatter.format(web.y)); } private function substitute(mapPoint:MapPoint):String { return StringUtil.substitute(m_template, numberFormatter.format(mapPoint.x), numberFormatter.format(mapPoint.y)); } private function geographicToDMS(mapPoint:MapPoint):String { const x:String = DegToDMS.format(mapPoint.x, DegToDMS.LON); const y:String = DegToDMS.format(mapPoint.y, DegToDMS.LAT); return StringUtil.substitute(m_template, x, y); } private function map_mouseMoveHandler(event:MouseEvent):void { const mapPoint:MapPoint = map.toMapFromStage(event.stageX, event.stageY);//获取鼠标移动的地图经纬度 coords.text = m_func(mapPoint); } ]]> </fx:Script> <fx:Declarations> <mx:NumberFormatter id="numberFormatter"/> </fx:Declarations> <viewer:filters> <mx:GlowFilter alpha="1" blurX="3" blurY="3" color="0xFFFFFF" strength="7"/> </viewer:filters> <s:Label id="coords" color="0x000000"/>//显示经纬度的位置，显示label </viewer:BaseWidget> （3）DegToDMS.as package widgets.Coordinate { /** * Utility class to pretty print decimal degree numbers. * @private */ public final class DegToDMS { // Constants to define the format. public static const LAT:String = "lat"; public static const LON:String = "lon"; /** * Utility function to format a decimal degree number into a pretty string with degrees, minutes and seconds. * @param decDeg the decimal degree number. * @param decDir "lat" for a latitude number, "lon" for a longitude value. * @return A pretty print string with degrees, minutes and seconds. */ public static function format(decDeg:Number, decDir:String):String//这个函数主要是用来把经纬度转换度分秒的形式来展示经纬度，比如113度23分23秒等等 { var d:Number = Math.abs(decDeg); var deg:Number = Math.floor(d); d = d - deg; var min:Number = Math.floor(d * 60); var av:Number = d - min / 60; var sec:Number = Math.floor(av * 60 * 60); if (sec == 60) { min++; sec = 0; } if (min == 60) { deg++; min = 0; } var smin:String = min < 10 ? "0" + min + "' " : min + "' "; var ssec:String = sec < 10 ? "0" + sec + "\" " : sec + "\" "; var sdir:String = (decDir == LAT) ? (decDeg < 0 ? "S" : "N") : (decDeg < 0 ? "W" : "E"); return deg + "\xB0 " + smin + ssec + sdir; } } } GIS技术交流群：432512093 GIS二次开发入门培训群：238339408 |
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