config.xml文件的配置例如以下：
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1 2 |
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源码文件夹例如以下：
地图坐标系模块的源码原理解析，具体的代码在下载的开源flexviewer自带的：
（1）CoordinateWidget.xml
1 <? xml version="1.0" ?> 2 <configuration label="Coordinates (default)"> 3 <!-- geo, dms, mercator 主要是坐标输出单位。默认的是经纬度 --> 4 <outputunit>geo</outputunit> 5 </configuration>
(2)CoordinateWidget.mxml
1 <?xml version="1.0" encoding="utf-8"?>
19 <viewer:BaseWidget xmlns:fx="http://ns.adobe.com/mxml/2009"
20 xmlns:s="library://ns.adobe.com/flex/spark"
21 xmlns:mx="library://ns.adobe.com/flex/mx"
22 xmlns:viewer="com.esri.viewer.*"
23 layout="horizontal"
24 widgetConfigLoaded="basewidget_widgetConfigLoadedHandler(event)">
25 <fx:Script>
26 <![CDATA[
27 import com.esri.ags.events.MapEvent;
28 import com.esri.ags.geometry.MapPoint;
29 import com.esri.ags.utils.WebMercatorUtil;
30
31 import mx.formatters.NumberBaseRoundType;
32 import mx.utils.StringUtil;
33
34 private var m_template:String;
35 private var m_func:Function = substitute;
36
37 protected function basewidget_widgetConfigLoadedHandler(event:Event):void
38 {
39 if (configXML)
40 {
//以下是读取CoordinateWidget.xml配置文件的资源。要是配置了的话
41 const decimalSeparator:String = [email protected]rator;
42 numberFormatter.decimalSeparatorTo = decimalSeparator ? decimalSeparator : ".";
43 const thousandsSeparator:String = [email protected];
44 numberFormatter.thousandsSeparatorTo = thousandsSeparator ?
thousandsSeparator : ",";
45 numberFormatter.useThousandsSeparator = [email protected] == "true";
46 numberFormatter.precision = parseFloat([email protected] || "-1");
47 const rounding:String = [email protected];
48 numberFormatter.rounding = rounding ? rounding : NumberBaseRoundType.NONE;
49 //获取设置坐标显示的字体和颜色样式等
50 const color:String = [email protected][0] || [email protected][0];
51 coords.setStyle("color", toNumber(color ? color : "0x000000"));
52 const fontFamily:String = [email protected][0] || [email protected][0];
53 coords.setStyle("fontFamily", fontFamily ? fontFamily : "Verdana");
54 const fontSize:String = [email protected][0] || [email protected][0];
55 coords.setStyle("fontSize", parseInt(fontSize ?
fontSize : "9"));
56 const fontWeight:String = [email protected][0] || [email protected][0];
57 coords.setStyle("fontWeight", fontWeight ?
fontWeight : "bold");
58
59 // If no template specified, show them with a space in between (except for special case below)
60 m_template = configXML.labels.template[0] || [email protected][0] || "{0} {1}";
61
62 if (map.loaded)
63 {
64 map_loadHandler(null);
65 }
66 else
67 {
68 map.addEventListener(MapEvent.LOAD, map_loadHandler);//载入地图
69 }
70 }
71
72 function map_loadHandler(event:MapEvent):void
73 {
74 map.removeEventListener(MapEvent.LOAD, map_loadHandler);
75 const wkid:int = map.spatialReference.wkid; //获取地图的空间坐标參考系
76 m_func = substitute;
77 const outputUnit:String = configXML.outputunit;//获取地图的坐标显示单位，从配置文件获取
78 if (outputUnit === "mercator")//推断地图的坐标体系。墨卡托情况下运行
79 {
80 if (wkid === 4326 || wkid === 4269 || wkid === 4267)
81 {
82 m_func = geographicToMercator;//调用地理坐标系转换墨卡托坐标系
83 }
84 }
85 else if (outputUnit === "geo")//地理坐标系情况下运行
86 {
87 if (wkid === 102100 || wkid === 102113 || wkid === 3857)
88 {
89 m_func = mercatorToGeographic;//调用墨卡托坐标系转换地理坐标系
90 // special default for geographic outputs
91 m_template = configXML.labels.template[0] || [email protected][0] || getDefaultString("latitudeLabel") + ":{1} " + getDefaultString("longitudeLabel") + ":{0}";//设置坐标显示的文字，比方经度，纬度
92 numberFormatter.precision = parseFloat([email protected] || "6");//设置坐标显示的位数
93 }
94 else if (wkid === 4326 || wkid === 4269 || wkid === 4267)
95 {
96 // special default for geographic outputs
97 m_template = configXML.labels.template[0] || [email protected][0] || getDefaultString("latitudeLabel") + ":{1} " + getDefaultString("longitudeLabel") + ":{0}";
98 numberFormatter.precision = parseFloat([email protected] || "6");
99 }
100 }
101 else if (outputUnit === "dms")//经纬度显示单位为度分秒形式情况下运行
102 {
103 if (wkid === 102100 || wkid === 102113 || wkid === 3857)
104 {
105 m_func = mercatorToDMS;
106 }
107 else if (wkid === 4326 || wkid === 4269 || wkid === 4267)
108 {
109 m_func = geographicToDMS;
110 }
111 }
112 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
113 }
114 }
115
116 private function toNumber(value:String):int//转换单位计算
117 {
118 if (value.substr(0, 2) == "0x")
119 {
120 return parseInt(value, 16);
121 }
122 return parseInt(value, 10);
123 }
124
125 private function mercatorToGeographic(web:MapPoint):String//墨卡托转换地理坐标系的函数
126 {
127 const geo:MapPoint = WebMercatorUtil.webMercatorToGeographic(web) as MapPoint;//arcgis api封装好的转换函数
128 return StringUtil.substitute(m_template,
129 numberFormatter.format(geo.x),
130 numberFormatter.format(geo.y));
131 }
132
133 private function mercatorToDMS(web:MapPoint):String//墨卡托转换经纬度度分秒形式的函数
134 {
135 const geo:MapPoint = WebMercatorUtil.webMercatorToGeographic(web) as MapPoint;
136 return StringUtil.substitute(m_template, DegToDMS.format(geo.x, DegToDMS.LON), DegToDMS.format(geo.y, DegToDMS.LAT));
137 }
138
139 private function geographicToMercator(geo:MapPoint):String//地理坐标系转换墨卡托的函数
140 {
141 const web:MapPoint = WebMercatorUtil.geographicToWebMercator(geo) as MapPoint;
142 return StringUtil.substitute(m_template,
143 numberFormatter.format(web.x),
144 numberFormatter.format(web.y));
145 }
146
147 private function substitute(mapPoint:MapPoint):String
148 {
149 return StringUtil.substitute(m_template,
150 numberFormatter.format(mapPoint.x),
151 numberFormatter.format(mapPoint.y));
152 }
153
154 private function geographicToDMS(mapPoint:MapPoint):String
155 {
156 const x:String = DegToDMS.format(mapPoint.x, DegToDMS.LON);
157 const y:String = DegToDMS.format(mapPoint.y, DegToDMS.LAT);
158 return StringUtil.substitute(m_template, x, y);
159 }
160
161 private function map_mouseMoveHandler(event:MouseEvent):void
162 {
163 const mapPoint:MapPoint = map.toMapFromStage(event.stageX, event.stageY);//获取鼠标移动的地图经纬度
164 coords.text = m_func(mapPoint);
165 }
166 ]]>
167 </fx:Script>
168
169 <fx:Declarations>
170 <mx:NumberFormatter id="numberFormatter"/>
171 </fx:Declarations>
172 <viewer:filters>
173 <mx:GlowFilter alpha="1"
174 blurX="3"
175 blurY="3"
176 color="0xFFFFFF"
177 strength="7"/>
178 </viewer:filters>
179 <s:Label id="coords" color="0x000000"/>//显示经纬度的位置。显示label
180 </viewer:BaseWidget>
（3）DegToDMS.as
1 package widgets.Coordinate
2 {
3
4 /**
5 * Utility class to pretty print decimal degree numbers.
6 * @private
7 */
8 public final class DegToDMS
9 {
10 // Constants to define the format.
11 public static const LAT:String = "lat";
12
13 public static const LON:String = "lon";
14
15 /**
16 * Utility function to format a decimal degree number into a pretty string with degrees, minutes and seconds.
17 * @param decDeg the decimal degree number.
18 * @param decDir "lat" for a latitude number, "lon" for a longitude value.
19 * @return A pretty print string with degrees, minutes and seconds.
20 */
21 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，比方113度23分23秒等等
22 {
23 var d:Number = Math.abs(decDeg);
24 var deg:Number = Math.floor(d);
25 d = d - deg;
26 var min:Number = Math.floor(d * 60);
27 var av:Number = d - min / 60;
28 var sec:Number = Math.floor(av * 60 * 60);
29 if (sec == 60)
30 {
31 min++;
32 sec = 0;
33 }
34 if (min == 60)
35 {
36 deg++;
37 min = 0;
38 }
39 var smin:String = min < 10 ? "0" + min + "‘ " : min + "‘ ";
40 var ssec:String = sec < 10 ?
"0" + sec + "\" " : sec + "\" ";
41 var sdir:String = (decDir == LAT) ? (decDeg < 0 ? "S" : "N") : (decDeg < 0 ?
"W" : "E");
42 return deg + "\xB0 " + smin + ssec + sdir;
43 }
44 }
45
46 }
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时间： 2024-10-14 11:48:49