【网摘】ArcGis for silverlights api 地图显示Gis绘制点线绘制图 以及提示信息 from

 

平台：Vs 2010,Blend 4,Silverlight 4

调用API: ArcGis for Silverligth API(ESRI.ArcGIS.Client)

OK，今天又有空来写点啦，这个例子自己不想拉的太长了，所以这节多写点东西，我尽量把东西都介绍全面，有不懂的可以留言~

有空大家共同讨论。

好进入正题，如今天标题所示，我们先来看画点，线，圆吧！

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01	/// <summary>

02	/// 绘制界面上的点和线

03	/// </summary>

04	/// <param name="myMap"></param>

05	/// <param name="point"></param>

06	/// <param name="pointLine"></param>

07	public void DrawAnimationCompleted(Map myMap, List<Graphic> point,ESRI.ArcGIS.Client.Geometry.PointCollection pointLine)

08

{

09	GraphicsLayer gPointLayer = new GraphicsLayer();

10	GraphicsLayer lineLayer = new GraphicsLayer();

11	SimpleLineSymbol lineSymbol = new SimpleLineSymbol();

12	lineSymbol.Color = new SolidColorBrush(Colors.Brown);

13	lineSymbol.Width = 1;

14	lineSymbol.Style = SimpleLineSymbol.LineStyle.Solid;

15

16	// 画线到图层上并绘制到地图上

17	GisMap.AddLayersToMap(myMap, new GraphicsLayer[] { lineLayer });

18	GisLine.DrawLineOnMap(pointLine, lineLayer, lineSymbol);

19

20	GisMap.DrawAllLayers(myMap, new GraphicsLayer[] { gPointLayer }, point);

21	GisMap.AddLayersToMap(myMap, new GraphicsLayer[] { gPointLayer });

22

}

好，看一下如何画圆吧。

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01	/// <summary>

02	/// 在地图上绘制圆

03	/// </summary>

04	/// <param name="myMap">地图</param>

05	/// <param name="container">绘制容器</param>

06	/// <param name="pt">要绘制的点</param>

07	/// <param name="drawCircleLayer"></param>

08	/// <param name="circleKm">直径</param>

09	/// <param name="color">填充色</param>

10	/// <param name="ellipseStroke">边框色</param>

11	public void DrawEllipse(Map myMap, Canvas container, MapPoint pt,ref ElementLayer drawCircleLayer, double circleKm,Color color,Color ellipseStroke)

12

{

13	if (!drawCircleLayer.Children.Contains(container))

14

{

15	drawCircleLayer.Children.Add(container);

16	container.Opacity = 0.5;

17	container.SetValue(ElementLayer.EnvelopeProperty, new Envelope(myMap.Extent.XMax, myMap.Extent.YMax, myMap.Extent.XMin, myMap.Extent.YMin));

18

}

19

20	Point ptFirst = myMap.MapToScreen(new MapPoint(Convert.ToDouble(pt.X),

21	Convert.ToDouble(pt.Y)));

22

23	Point pt7 = myMap.MapToScreen(new MapPoint((Convert.ToDouble(pt.X) + circleKm * kmToEN),

24	Convert.ToDouble(pt.Y)));

25

26	Ellipse ellipse7 = new Ellipse();

27	ellipse7.Width = (pt7.X - ptFirst.X) * 2;

28	ellipse7.Height = ellipse7.Width;

29	ellipse7.StrokeThickness = 1;

30	ellipse7.Stroke = new SolidColorBrush(ellipseStroke);

31	ellipse7.Fill = new SolidColorBrush(color);

32	Canvas.SetLeft(ellipse7, ptFirst.X - ellipse7.Width / 2);

33	Canvas.SetTop(ellipse7, ptFirst.Y - ellipse7.Width / 2);

34	ellipse7.Opacity = 0.5;

35

36	container.Children.Add(ellipse7);

37	container.IsHitTestVisible = false;

38	container.SetValue(Canvas.ZIndexProperty, -10);

39

}

这是一个画圆的方法，需要地图类，点，Canvas容器,Gis 的地图层ElementLayer和color

我前台是这样调用的

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/// <summary>

  /// 绘制7级风圈和10级风圈

  /// </summary>

  /// <param name="myMap"></param>

  /// <param name="sender"></param>

  public void DrawEllipse7And10WindCircle(Map myMap, object sender)

  {

                  if (GisMap.LayerExist(myMap, "WindCircleLayer"))           

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 {                GisMap.DeleteLayersToMap(myMap, "WindCircleLayer");            }

            ElementLayer circleLayer = new ElementLayer();

            circleLayer.ID = "WindCircleLayer";

            Canvas circleCanvas = new Canvas();

            Graphic tipGraphic = sender as Graphic;

            if (Convert.ToDouble(tipGraphic.Attributes["WindCircle7"]) != 0)

            {

                Color color = new Color();

                color.A = 255;

                color.R = 153;

                color.G = 105;

                color.B = 192;

                DrawEllipse(myMap, circleCanvas, new MapPoint(Convert.ToDouble(tipGraphic.Attributes["Longitude"]),

                    Convert.ToDouble(tipGraphic.Attributes["Latitude"])), ref circleLayer,

                    Convert.ToDouble(300), color, Colors.Blue);

            }

            if (Convert.ToDouble(tipGraphic.Attributes["WindCircle10"]) != 0)

            {

                Color color = new Color();

                color.A = 255;

                color.R = 111;

                color.G = 91;

                color.B = 171;

                this.DrawEllipse(myMap, circleCanvas, new MapPoint(Convert.ToDouble(tipGraphic.Attributes["Longitude"]),

                    Convert.ToDouble(tipGraphic.Attributes["Latitude"])), ref circleLayer,

                    Convert.ToDouble(tipGraphic.Attributes["WindCircle10"]), color, Colors.Blue);

            }

            GisMap.AddLayersToMap(myMap, new ElementLayer[] { circleLayer });

        }

这里的sender是一个Gis元素 Graphic,根据我的WebService 取到的实体后我把这个点加上了Attributes，一系列属性，所以在上面的代码可以看到tipGraphic.Attributes["WindCircle10"],

下面的代码就是在我从WebService取到实体后做添加点的代码:

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/// <summary>

/// 添加台风点代码

/// 添加鼠标移入、移出事件

/// </summary>

/// <param name="model"></param>

/// <param name="i"></param>

private void AddPointToGraphic(TyphoonModel model, int i, List<Graphic> pointParam)

{

    SimpleMarkerSymbol symbol = new SimpleMarkerSymbol();

    Color color = new Color();

    color.A = 255;

    if (Convert.ToDouble(model.WS) <= 17.1)

    {

        color.R = 0;

        color.G = 254;

        color.B = 223;

        symbol.Color = new SolidColorBrush(color);

    }

    else if (Convert.ToDouble(model.WS) > 17.1 && Convert.ToDouble(model.WS) <= 24.4)

    {

        color.R = 254;

        color.G = 243;

        color.B = 0;

        symbol.Color = new SolidColorBrush(color);

    }

    else if (Convert.ToDouble(model.WS) > 24.4 && Convert.ToDouble(model.WS) <= 32.6)

    {

        color.R = 254;

        color.G = 144;

        color.B = 44;

        symbol.Color = new SolidColorBrush(color);

    }

    else if (Convert.ToDouble(model.WS) > 32.6 && Convert.ToDouble(model.WS) <= 41.4)

    {

        color.R = 254;

        color.G = 4;

        color.B = 4; symbol.Color = new SolidColorBrush(color);

    }

    else if (Convert.ToDouble(model.WS) > 41.4 && Convert.ToDouble(model.WS) <= 50.9)

    {

        color.R = 254;

        color.G = 58;

        color.B = 163; symbol.Color = new SolidColorBrush(color);

    }

    else if (Convert.ToDouble(model.WS) > 50.9)

    {

        color.R = 174;

        color.G = 0;

        color.B = 217; symbol.Color = new SolidColorBrush(color);

    }

    symbol.Size = 10;

    if (i == 0)

    {

        symbol.Style = SimpleMarkerSymbol.SimpleMarkerStyle.Square;

    }

    else

    {

        symbol.Style = SimpleMarkerSymbol.SimpleMarkerStyle.Circle;

    }

    pointParam.Add(new Graphic()

    {

        Geometry = new MapPoint(model.Longitude, model.Latitude),

        Symbol = symbol

    });

    pointParam[i].Attributes.Add("TyphoonID", model.TyphoonID);

    pointParam[i].Attributes.Add("TyphoonNo", model.TyphoonNo);

    pointParam[i].Attributes.Add("TyphoonName", model.TyphoonName);

    pointParam[i].Attributes.Add("WindCircle7", model.WindCircle7);

    pointParam[i].Attributes.Add("WindCircle10", model.WindCircle10);

    pointParam[i].Attributes.Add("WS", model.WS);

    pointParam[i].Attributes.Add("Pressure", model.Pressure);

    pointParam[i].Attributes.Add("IssueTime", model.IssueTime);

    pointParam[i].Attributes.Add("Future", model.Future);

    pointParam[i].Attributes.Add("Latitude", model.Latitude);

    pointParam[i].Attributes.Add("Longitude", model.Longitude);

}

信息提示功能如图:

我们先看下Xmal中的代码:

 

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<Canvas x:Name="typhoonPointInfoCanvas" Visibility="Visible" Height="188" HorizontalAlignment="Left" Margin="0,-272,0,0" VerticalAlignment="Top" Width="360">

    <Path Stretch="Fill" Stroke="Black"  Height="168.5" Width="328.5" UseLayoutRounding="False" Canvas.Left="0.5" Canvas.Top="-0.5" Data="M113,25 C113,11.745166 123.74516,1.0000004 137,1.0000004 L304,1.0000004 C317.25482,1.0000004 328,11.745166 328,25 L328,144 C328,157.25484 317.25482,168 304,168 L137,168 C123.74516,168 113,157.25484 113,144 z M112.5,24.499998 L0.5,0.5 L112.5,72.499992 z" Fill="{StaticResource CommonGradient2}"/>

    <StackPanel Orientation="Vertical" Height="168" Width="176" Canvas.Left="137" Canvas.Top="15">

        <TextBlock x:Name="typhoonNameTextBlock" Height="20" Text="名称:" Foreground="White" TextWrapping="Wrap"/>

        <TextBlock x:Name="typhoonCollectionTimeTextBlock" Height="20" Text="时间:" Foreground="White" TextWrapping="Wrap" d:LayoutOverrides="HorizontalAlignment"/>

        <TextBlock x:Name="typhoonPositionTextBlock" Height="20" Text="位置:" Foreground="White" TextWrapping="Wrap" d:LayoutOverrides="HorizontalAlignment"/>

        <TextBlock x:Name="typhoonWSTextBlock" Height="20" Text="最大风速:" Foreground="White" TextWrapping="Wrap" d:LayoutOverrides="HorizontalAlignment"/>

        <TextBlock x:Name="typhoonPressureTextBlock" Height="20" Text="中心气压:" Foreground="White" TextWrapping="Wrap" d:LayoutOverrides="HorizontalAlignment"/>

        <TextBlock x:Name="typhoonCircle7TextBlock" Height="20" Text="7级风圈半径:" Foreground="White" TextWrapping="Wrap" d:LayoutOverrides="HorizontalAlignment"/>

        <TextBlock x:Name="typhoonCircle10TextBlock" Height="20" Text="10级风圈半径:" Foreground="White" TextWrapping="Wrap" d:LayoutOverrides="HorizontalAlignment"/>

    </StackPanel>

</Canvas>

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<BR>

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        <LinearGradientBrush x:Key="CommonGradient" StartPoint="0.5,0" EndPoint="0.5,1">            <GradientStop Offset="0" Color="#ee76a8d3"/>            <GradientStop Offset="0.25" Color="#ee5b8cb5"/>            <GradientStop Offset="0.75" Color="#ee4b7ba7"/>        </LinearGradientBrush><BR>

看下c# 中的代码:

当我们添加那些点也就是 Graphic 的时候有这样一个事件MouseEventHandler

 

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01	// 添加点和线，先显示点层，动画结束后显示线层

02	mapDraw.DrawLineAndPoint(ref point, myMap, gLayer, ref pointLine, e, length);

03

04

05

// 添加点事件

06	foreach (Graphic item in point)

07

{

08	item.MouseEnter += new MouseEventHandler(MainPage_MouseEnter);

09	item.MouseLeave += new MouseEventHandler(MainPage_DrawLine);

10

}

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01	/// <summary>

02	/// 绘制单条台风动画前的信息

03	/// </summary>

04	/// <param name="point"></param>

05	/// <param name="myMap"></param>

06	/// <param name="gLayer"></param>

07	/// <param name="pointLine"></param>

08	/// <param name="e"></param>

09	/// <param name="length"></param>

10	public void DrawLineAndPoint(ref List<Graphic> point,Map myMap,GraphicsLayer gLayer,

11	ref ESRI.ArcGIS.Client.Geometry.PointCollection pointLine, GetTyphoonsCompletedEventArgs e, int length)

12

{

13	#region 添加点代码

14	point = new List<Graphic>();

15	for (int i = 0; i < length; i++)

16

{

17	AddPointToGraphic(e.Result[i], i, point);

18

}

19	#endregion

20

21

// 添加线的代码

22	pointLine = new ESRI.ArcGIS.Client.Geometry.PointCollection();

23	AddLineToMap(e.Result.ToList(), length, pointLine);

24

25

// 显示点层

26	GisMap.DrawAllLayers(myMap, new GraphicsLayer[] { gLayer }, point);

27	GisMap.AddLayersToMap(myMap, new GraphicsLayer[] { gLayer });

28

}

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1	AddPointToGraphic这个方法就是图片上面的那段代码

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1	<SPAN style="FONT-SIZE: 14px"> item.MouseEnter += new MouseEventHandler(MainPage_MouseEnter);     </SPAN>

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1	item.MouseLeave += new MouseEventHandler(MainPage_DrawLine);

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1	这两段代码就是我们添加鼠标移入和移出事件了，我们看下移入事件:

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01	<DIV class=cnblogs_Highlighter><PRE class=csharp>        void MainPage_MouseEnter(object sender, MouseEventArgs e)

02

{

03	Graphic graphic = sender as Graphic;

04	Cursor = Cursors.Hand;

05

06	typhoonPointInfoCanvas.Visibility = Visibility.Visible;

07

08	Point pt = myMap.MapToScreen(new MapPoint(Convert.ToDouble(graphic.Attributes["Longitude"]), Convert.ToDouble(graphic.Attributes["Latitude"])));

09

10	typhoonPointInfoCanvas.SetValue(Grid.MarginProperty, new Thickness(pt.X, pt.Y, 0, 0));

11

12	typhoonNameTextBlock.Text = "台风：" + graphic.Attributes["TyphoonName"].ToString();

13	typhoonCollectionTimeTextBlock.Text = "时间：" + graphic.Attributes["IssueTime"].ToString();

14	typhoonPositionTextBlock.Text = "位置：" + graphic.Attributes["Longitude"].ToString() + "°E," + graphic.Attributes["Latitude"].ToString() + "°N";

15	typhoonWSTextBlock.Text = "最大风速：" + graphic.Attributes["WS"].ToString() + " m/s";

16	typhoonPressureTextBlock.Text = "中心气压：" + graphic.Attributes["Pressure"].ToString() + " hPa";

17	typhoonCircle7TextBlock.Text = "7级风圈半径：" + graphic.Attributes["WindCircle7"].ToString() + " km";

18	typhoonCircle10TextBlock.Text = "10级风圈半径：" + graphic.Attributes["WindCircle10"].ToString() + " km";

19

20	circle.DrawEllipse7And10WindCircle(myMap, sender);

21	selectedGarphic = sender as Graphic;

22

}</PRE>

23

</DIV>

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1	我们看到在显示信息的同时我们又把圆画了上去<SPAN style="FONT-SIZE: 14px">DrawEllipse7And10WindCircle()这个函数</SPAN>

GisMap是个静态类，以下是他的代码

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01	/// <summary>

02	/// ArcGis 调用类

03	/// 动态加载、显示隐藏层数据、加载层上的点等

04	/// 日期：2010-5-10

05	/// 作者：AngelSoft

06	/// </summary>

07	public static class GisMap

08

{

09

10	/// <summary>

11	/// 绘制所有的点到地图上

12	/// </summary>

13	/// <param name="glayer"></param>

14	/// <param name="cacheGraphic"></param>

15	public static void DrawSymbol(GraphicsLayer glayer, List<Graphic> cacheGraphic)

16

{

17	if (glayer != null)

18

{

19	int graphicCount = cacheGraphic.Count;

20	for (int i = 0; i < graphicCount; i++)

21

{

22	glayer.Graphics.Add(cacheGraphic[i]);

23

} // i

24

}

25

}

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001	/// <summary>

002	/// 加载所有图层上的点

003

/// 动态绘制

004	/// 图层和点的对应关系要正确

005	/// 有几个图层就要有几个点集合

006	/// </summary>

007	/// <param name="map">ArcGis 地图变量</param>

008	/// <param name="layers">GraphicLayer 层数组</param>

009	/// <param name="graphicParam">Graphic 点数组</param>

010	public static void DrawLayers(Map map, GraphicsLayer[] layers, params List<Graphic>[] graphicParam)

011

{

012	// 计算要绘制的层数并一层一层的绘制(调用动态绘制方法)

013	if (layers != null)

014

{

015	int length = layers.Length;

016	for (int i = 0; i < length; i++)

017

{

018	if (layers[i] == null)

019

{

020	layers[i] = new GraphicsLayer();

021

}

022	DynamicDrawSymbol(layers[i], graphicParam[i], map);

023

}

024

}

025

}

026

027

028	/// <summary>

029	/// 加载所有图层上的点

030

/// 画所有点

031	/// 图层和点的对应关系要正确

032	/// 有几个图层就要有几个点集合

033	/// </summary>

034	/// <param name="map">ArcGis 地图变量</param>

035	/// <param name="layers">GraphicLayer 层数组</param>

036	/// <param name="graphicParam">Graphic 点数组</param>

037	public static void DrawAllLayers(Map map, GraphicsLayer[] layers, params List<Graphic>[] graphicParam)

038

{

039	// 计算要绘制的层数并一层一层的绘制(调用动态绘制方法)

040	if (layers != null)

041

{

042	int length = layers.Length;

043	for (int i = 0; i < length; i++)

044

{

045	if (layers[i] == null)

046

{

047	layers[i] = new GraphicsLayer();

048

}

049	DrawAllGraphics(layers[i], graphicParam[i]);

050

}

051

}

052

}

053

054

055

056	/// <summary>

057	/// 隐藏或显示 ArcGis 层

058	/// </summary>

059	/// <param name="show">隐藏或显示</param>

060	/// <param name="layers">层</param>

061	public static void LayersVisibility(bool show, params GraphicsLayer[] layers)

062

{

063	if (layers != null)

064

{

065	foreach (GraphicsLayer item in layers)

066

{

067	item.Visible = show;

068

}

069

}

070

}

071

072

073	/// <summary>

074	/// 将图层数组全部从 map 中移除

075	/// </summary>

076	/// <param name="map">表示一张 ArcGis 地图</param>

077	/// <param name="layers">表示地图层的数组</param>

078	public static void DeleteLayersToMap(Map map, GraphicsLayer[] layers)

079

{

080	// 逐个将数据移除

081	foreach (GraphicsLayer item in layers)

082

{

083	map.Layers.Remove(item);

084

}

085

}

086

087	/// <summary>

088	/// 根据 ID 号删除某层

089	/// </summary>

090	/// <param name="map"></param>

091	/// <param name="ID"></param>

092	/// <returns></returns>

093	public static void DeleteLayersToMap(Map map, string[] ID)

094

{

095	int length = ID.Length;

096

097	for (int i = 0; i < length; i++)

098

{

099	foreach (Layer item in map.Layers)

100

{

101	if (item.ID == ID[i])

102

{

103	map.Layers.Remove(item);

104

length--;

105

break;

106

}

107

}

108

}

109

}

110

111	/// <summary>

112	/// 将图层数组全部从 map 中移除

113	/// </summary>

114	/// <param name="map">表示一张 ArcGis 地图</param>

115	/// <param name="layers">表示地图层的数组</param>

116	public static void DeleteLayersToMap(Map map, ElementLayer[] layers)

117

{

118	// 逐个将数据移除

119	foreach (ElementLayer item in layers)

120

{

121	map.Layers.Remove(item);

122

}

123

}

124

125

126	/// <summary>

127	/// 删除地图上的某一层

128	/// </summary>

129	/// <param name="myMap"></param>

130	/// <param name="ID">ID号</param>

131	public static void DeleteLayersToMap(Map myMap, string ID)

132

{

133	int layers = myMap.Layers.Count;

134	for (int i = 0; i < layers; i++)

135

{

136	if (myMap.Layers[i].ID == ID)

137

{

138	myMap.Layers.RemoveAt(i);

139

return;

140

}

141

}

142

}

143

144

145	public static bool LayerExist(Map myMap, string ID)

146

{

147	int layers = myMap.Layers.Count;

148	for (int i = 0; i < layers; i++)

149

{

150	if (myMap.Layers[i].ID == ID)

151

{

152	return true;

153

}

154

}

155	return false;

156

}

157

158

159	/// <summary>

160	/// 将图层数组全部添加到 map 中

161	/// </summary>

162	/// <param name="map">表示一张 ArcGis 地图</param>

163	/// <param name="layers">表示地图层的数组</param>

164	public static void AddLayersToMap(Map map, GraphicsLayer[] layers)

165

{

166	// 逐个将数据添加到当前地图中

167	foreach (GraphicsLayer item in layers)

168

{

169	if (item != null)

170

{

171	map.Layers.Add(item);

172

}

173

}

174

}

175

176	/// <summary>

177	/// 将图层数组全部添加到 map 中

178	/// </summary>

179	/// <param name="map">表示一张 ArcGis 地图</param>

180	/// <param name="layers">表示地图层的数组</param>

181	public static void AddLayersToMap(Map map, ElementLayer[] layers)

182

{

183	// 逐个将数据添加到当前地图中

184	foreach (ElementLayer item in layers)

185

{

186	map.Layers.Add(item);

187

}

188

}

189

190	/// <summary>

191	/// 绘制所有的点到地图上

192	/// </summary>

193	/// <param name="eLayer"></param>

194	/// <param name="image"></param>

195	public static void AddImageToElementLayer(ElementLayer eLayer, List<Image> image)

196

{

197	if (eLayer != null)

198

{

199	foreach (Image item in image)

200

{

201	eLayer.Children.Add(item);

202

}

203

}

204

}

205

206	/// <summary>

207	/// 隐藏或显示 ArcGis 层

208	/// </summary>

209	/// <param name="show">隐藏或显示</param>

210	/// <param name="layers">层</param>

211	public static void LayersVisibility(bool show, params ElementLayer[] layers)

212

{

213	if (layers != null)

214

{

215	foreach (ElementLayer item in layers)

216

{

217	item.Visible = show;

218

}

219

}

220

}

221

222	/// <summary>

223	/// 动态加载图层

224	/// 使用 ElementLayer 层

225	/// </summary>

226	/// <param name="eLayer"></param>

227	/// <param name="cacheGraphic"></param>

228	/// <param name="map"></param>

229	public static void DynamicDrawElementLayer(ElementLayer eLayer, List<UIElement> cacheElement, Map map)

230

{

231	// 以下四个变量分别表示地图的四个边

232	// 即最大经纬度和最小经纬度

233	// xMax最大经度,yMax最大纬度

234	double xMax = map.Extent.XMax + 2;

235	double xMin = map.Extent.XMin - 2;

236	double yMax = map.Extent.YMax + 2;

237	double yMin = map.Extent.YMin - 2;

238

239	// 去除不在坐标范围内的点,先检查图层是否为空

240	if (eLayer != null)

241

{

242	int graphicCount = eLayer.Children.Count;

243	for (int i = 0; i < graphicCount; i++)

244

{

245	UIElement element = eLayer.Children[i];

246

247	// 判断经度,纬度

248	if (!(((element.GetValue(ElementLayer.EnvelopeProperty) as Envelope).Extent.XMax < xMax && (element.GetValue(ElementLayer.EnvelopeProperty) as Envelope).Extent.XMax > xMin)

249	&& ((element.GetValue(ElementLayer.EnvelopeProperty) as Envelope).Extent.YMax < yMax && (element.GetValue(ElementLayer.EnvelopeProperty) as Envelope).Extent.YMax > yMin)))

250

{

251	// 将点在地图上移除,并放在缓存中

252	cacheElement.Add(eLayer.Children[i]);

253	eLayer.Children.Remove(eLayer.Children[i]);

254	graphicCount--;   // 当从集合中移除元素时应该把 graphicCount 减1

255	i--;              // 元素被移除后相当于当前元素的后一位元素会 -1,应该再循环一次本次循环所以应该 -1

256

}

257

} // i

258

}

259

260	// 检查缓存是否为空,并将点绘制到图形上

261	if (cacheElement != null)

262

{

263	int count = cacheElement.Count;

264	for (int i = 0; i < count; i++)

265

{

266	// 判断经度,纬度

267	if (((cacheElement[i].GetValue(ElementLayer.EnvelopeProperty) as Envelope).Extent.XMax < xMax && (cacheElement[i].GetValue(ElementLayer.EnvelopeProperty) as Envelope).Extent.XMax > xMin)

268	&& ((cacheElement[i].GetValue(ElementLayer.EnvelopeProperty) as Envelope).Extent.YMax < yMax && (cacheElement[i].GetValue(ElementLayer.EnvelopeProperty) as Envelope).Extent.YMax > yMin))

269

{

270	// 运行到此则该点在目前地图范围内,将该点加入到地图中

271	eLayer.Children.Add(cacheElement[i]);

272	cacheElement.Remove(cacheElement[i]);

273	count--;    // 当从集合中移除元素时应该把 count 减1

274	i--;        // 元素被移除后相当于当前元素的后一位元素会 -1,应该再循环一次本次循环所以应该 -1

275

continue;

276

}

277

}

278

}

279

}

280

281	/// <summary>

282	/// 将所有元素画到地图上

283	/// </summary>

284	/// <param name="eLayer"></param>

285	/// <param name="cacheElement"></param>

286	public static void DrawAllUIElement(ElementLayer eLayer, List<UIElement> cacheElement)

287

{

288	if (eLayer != null)

289

{

290	foreach (UIElement item in cacheElement)

291

{

292	eLayer.Children.Add(item);

293

}

294

}

295

}

296

297	/// <summary>

298	/// 动态的绘制图层

299	/// 当然地图移动到相应的坐标后绘制(保留原来的点,绘制新的数据)

300	/// 实现了无刷新绘制

301	/// </summary>

302	/// <param name="glayer">表示地图上的层</param>

303	/// <param name="cacheGraphic">存放 Graphics 的缓存</param>

304	/// <param name="map">表示一张 ArcGis 地图</param>

305	private static void DynamicDrawSymbol(GraphicsLayer glayer, List<Graphic> cacheGraphic, Map map)

306

{

307	// 以下四个变量分别表示地图的四个边

308	// 即最大经纬度和最小经纬度

309	// xMax最大经度,yMax最大纬度

310	double xMax = map.Extent.XMax + 2;

311	double xMin = map.Extent.XMin - 2;

312	double yMax = map.Extent.YMax + 2;

313	double yMin = map.Extent.YMin - 2;

314

315	// 去除不在坐标范围内的点,先检查图层是否为空

316	if (glayer != null)

317

{

318	int graphicCount = glayer.Graphics.Count;

319	for (int i = 0; i < graphicCount; i++)

320

{

321	// 判断经度,纬度

322	if (!((glayer.Graphics[i].Geometry.Extent.XMax < xMax && glayer.Graphics[i].Geometry.Extent.XMax > xMin)

323	&& (glayer.Graphics[i].Geometry.Extent.YMax < yMax && glayer.Graphics[i].Geometry.Extent.YMax > yMin)))

324

{

325	// 将点在地图上移除,并放在缓存中

326	cacheGraphic.Add(glayer.Graphics[i]);

327	glayer.Graphics.Remove(glayer.Graphics[i]);

328	graphicCount--;   // 当从集合中移除元素时应该把 graphicCount 减1

329	i--;              // 元素被移除后相当于当前元素的后一位元素会 -1,应该再循环一次本次循环所以应该 -1

330

}

331

} // i

332

}

333

334	// 检查缓存是否为空,并将点绘制到图形上

335	if (cacheGraphic != null)

336

{

337	int count = cacheGraphic.Count;

338	for (int i = 0; i < count; i++)

339

{

340	// 判断经度,纬度

341	if ((cacheGraphic[i].Geometry.Extent.XMax < xMax && cacheGraphic[i].Geometry.Extent.XMax > xMin)

342	&& (cacheGraphic[i].Geometry.Extent.YMax < yMax && cacheGraphic[i].Geometry.Extent.YMax > yMin))

343

{

344	// 运行到此则该点在目前地图范围内,将该点加入到地图中

345	glayer.Graphics.Add(cacheGraphic[i]);

346	cacheGraphic.Remove(cacheGraphic[i]);

347	count--;    // 当从集合中移除元素时应该把 count 减1

348	i--;        // 元素被移除后相当于当前元素的后一位元素会 -1,应该再循环一次本次循环所以应该 -1

349

continue;

350

}

351

}

352

}

353

}

354

355	/// <summary>

356	/// 将所有元素画到地图上

357	/// </summary>

358	/// <param name="eLayer"></param>

359	/// <param name="cacheElement"></param>

360	private static void DrawAllGraphics(GraphicsLayer eLayer, List<Graphic> cacheGraphic)

361

{

362	if (eLayer != null)

363

{

364	foreach (Graphic item in cacheGraphic)

365

{

366	eLayer.Graphics.Add(item);

367

}

368

}

369

}

370

}

今天把 GisMap 这个类都写出来了也为了我写下一篇文章做准备吧！后面会写一篇动态加载数据点的文章！因为当大批量点(2000)左右加载到地图上的时候，

就会非常的卡，基本都动不了，所以我们要动态去加载这些点。