ArcGis For Silverlight API,地圖顯示Gis,繪制點，線，繪制圖等(三)--繪制點、線、圓，顯示提示資訊

平台：Vs 2010,Blend 4,Silverlight 4

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

轉載自：http://www.cnblogs.com/Royal_WH/archive/2010/11/05/1869906.html

OK，今天又有空來寫點啦，這個例子自己不想拉的太長了，是以這節多寫點東西，我盡量把東西都介紹全面，有不懂的可以留言~

有空大家共同讨論。

好進入正題，如今天标題所示，我們先來看畫點，線，圓吧！

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01	/// <summary>

02	/// 繪制界面上的點和線

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	// 畫線到圖層上并繪制到地圖上

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，看一下如何畫圓吧。

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01	/// <summary>

02	/// 在地圖上繪制圓

03	/// </summary>

04	/// <param name="myMap">地圖</param>

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

06	/// <param name="pt">要繪制的點</param>

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

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

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

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

}

這是一個畫圓的方法，需要地圖類，點，Canvas容器,Gis 的地圖層ElementLayer和color

我前台是這樣調用的

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/// <summary>

/// 繪制7級風圈和10級風圈

/// </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 });

}

這裡的sender是一個Gis元素 Graphic,根據我的WebService 取到的實體後我把這個點加上了Attributes，一系列屬性，是以在上面的代碼可以看到tipGraphic.Attributes["WindCircle10"],

下面的代碼就是在我從WebService取到實體後做添加點的代碼:

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/// <summary>

/// 添加台風點代碼

/// 添加滑鼠移入、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);

}

資訊提示功能如圖:

我們先看下Xmal中的代碼:

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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 = "名稱:" Foreground = "White" TextWrapping = "Wrap" />

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

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

< TextBlock x:Name = "typhoonCircle7TextBlock" Height = "20" Text = "7級風圈半徑:" Foreground = "White" TextWrapping = "Wrap" d:LayoutOverrides = "HorizontalAlignment" />

< TextBlock x:Name = "typhoonCircle10TextBlock" Height = "20" Text = "10級風圈半徑:" 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# 中的代碼:

當我們添加那些點也就是 Graphic 的時候有這樣一個事件MouseEventHandler

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01	// 添加點和線，先顯示點層，動畫結束後顯示線層

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

03

04

05

// 添加點事件

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	/// 繪制單條台風動畫前的資訊

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 添加點代碼

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

// 添加線的代碼

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

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

24

25

// 顯示點層

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

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

28

}

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1	AddPointToGraphic這個方法就是圖檔上面的那段代碼

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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	這兩段代碼就是我們添加滑鼠移入和移出事件了，我們看下移入事件:

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01	<DIV class =cnblogs_Highlighter><PRE class =brush: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 = "台風：" + graphic.Attributes[ "TyphoonName" ].ToString();

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

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

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

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

17	typhoonCircle7TextBlock.Text = "7級風圈半徑：" + graphic.Attributes[ "WindCircle7" ].ToString() + " km" ;

18	typhoonCircle10TextBlock.Text = "10級風圈半徑：" + 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	我們看到在顯示資訊的同時我們又把圓畫了上去<SPAN style= "FONT-SIZE: 14px" >DrawEllipse7And10WindCircle()這個函數</SPAN>

GisMap是個靜态類，以下是他的代碼

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01	/// <summary>

02	/// ArcGis 調用類

03	/// 動态加載、顯示隐藏層資料、加載層上的點等

04	/// 日期：2010-5-10

05	/// 作者：AngelSoft

06	/// </summary>

07	public static class GisMap

08

{

09

10	/// <summary>

11	/// 繪制所有的點到地圖上

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	/// 加載所有圖層上的點

003

/// 動态繪制

004	/// 圖層和點的對應關系要正确

005	/// 有幾個圖層就要有幾個點集合

006	/// </summary>

007	/// <param name="map">ArcGis 地圖變量</param>

008	/// <param name="layers">GraphicLayer 層數組</param>

009	/// <param name="graphicParam">Graphic 點數組</param>

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

011

{

012	// 計算要繪制的層數并一層一層的繪制(調用動态繪制方法)

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	/// 加載所有圖層上的點

030

/// 畫所有點

031	/// 圖層和點的對應關系要正确

032	/// 有幾個圖層就要有幾個點集合

033	/// </summary>

034	/// <param name="map">ArcGis 地圖變量</param>

035	/// <param name="layers">GraphicLayer 層數組</param>

036	/// <param name="graphicParam">Graphic 點數組</param>

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

038

{

039	// 計算要繪制的層數并一層一層的繪制(調用動态繪制方法)

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	/// 隐藏或顯示 ArcGis 層

058	/// </summary>

059	/// <param name="show">隐藏或顯示</param>

060	/// <param name="layers">層</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	/// 将圖層數組全部從 map 中移除

075	/// </summary>

076	/// <param name="map">表示一張 ArcGis 地圖</param>

077	/// <param name="layers">表示地圖層的數組</param>

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

079

{

080	// 逐個将資料移除

081	foreach (GraphicsLayer item in layers)

082

{

083	map.Layers.Remove(item);

084

}

085

}

086

087	/// <summary>

088	/// 根據 ID 号删除某層

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	/// 将圖層數組全部從 map 中移除

113	/// </summary>

114	/// <param name="map">表示一張 ArcGis 地圖</param>

115	/// <param name="layers">表示地圖層的數組</param>

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

117

{

118	// 逐個将資料移除

119	foreach (ElementLayer item in layers)

120

{

121	map.Layers.Remove(item);

122

}

123

}

124

125

126	/// <summary>

127	/// 删除地圖上的某一層

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	/// 将圖層數組全部添加到 map 中

161	/// </summary>

162	/// <param name="map">表示一張 ArcGis 地圖</param>

163	/// <param name="layers">表示地圖層的數組</param>

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

165

{

166	// 逐個将資料添加到目前地圖中

167	foreach (GraphicsLayer item in layers)

168

{

169	if (item != null )

170

{

171	map.Layers.Add(item);

172

}

173

}

174

}

175

176	/// <summary>

177	/// 将圖層數組全部添加到 map 中

178	/// </summary>

179	/// <param name="map">表示一張 ArcGis 地圖</param>

180	/// <param name="layers">表示地圖層的數組</param>

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

182

{

183	// 逐個将資料添加到目前地圖中

184	foreach (ElementLayer item in layers)

185

{

186	map.Layers.Add(item);

187

}

188

}

189

190	/// <summary>

191	/// 繪制所有的點到地圖上

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	/// 隐藏或顯示 ArcGis 層

208	/// </summary>

209	/// <param name="show">隐藏或顯示</param>

210	/// <param name="layers">層</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	/// 動态加載圖層

224	/// 使用 ElementLayer 層

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	// 以下四個變量分别表示地圖的四個邊

232	// 即最大經緯度和最小經緯度

233	// xMax最大經度,yMax最大緯度

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	// 去除不在坐标範圍内的點,先檢查圖層是否為空

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	// 判斷經度,緯度

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	// 将點在地圖上移除,并放在緩存中

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

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

254	graphicCount--;   // 當從集合中移除元素時應該把 graphicCount 減1

255	i--;              // 元素被移除後相當于目前元素的後一位元素會 -1,應該再循環一次本次循環是以應該 -1

256

}

257

} // i

258

}

259

260	// 檢查緩存是否為空,并将點繪制到圖形上

261	if (cacheElement != null )

262

{

263	int count = cacheElement.Count;

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

265

{

266	// 判斷經度,緯度

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	// 運作到此則該點在目前地圖範圍内,将該點加入到地圖中

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

272	cacheElement.Remove(cacheElement[i]);

273	count--;    // 當從集合中移除元素時應該把 count 減1

274	i--;        // 元素被移除後相當于目前元素的後一位元素會 -1,應該再循環一次本次循環是以應該 -1

275	continue ;

276

}

277

}

278

}

279

}

280

281	/// <summary>

282	/// 将所有元素畫到地圖上

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	/// 動态的繪制圖層

299	/// 當然地圖移動到相應的坐标後繪制(保留原來的點,繪制新的資料)

300	/// 實作了無重新整理繪制

301	/// </summary>

302	/// <param name="glayer">表示地圖上的層</param>

303	/// <param name="cacheGraphic">存放 Graphics 的緩存</param>

304	/// <param name="map">表示一張 ArcGis 地圖</param>

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

306

{

307	// 以下四個變量分别表示地圖的四個邊

308	// 即最大經緯度和最小經緯度

309	// xMax最大經度,yMax最大緯度

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	// 去除不在坐标範圍内的點,先檢查圖層是否為空

316	if (glayer != null )

317

{

318	int graphicCount = glayer.Graphics.Count;

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

320

{

321	// 判斷經度,緯度

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	// 将點在地圖上移除,并放在緩存中

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

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

328	graphicCount--;   // 當從集合中移除元素時應該把 graphicCount 減1

329	i--;              // 元素被移除後相當于目前元素的後一位元素會 -1,應該再循環一次本次循環是以應該 -1

330

}

331

} // i

332

}

333

334	// 檢查緩存是否為空,并将點繪制到圖形上

335	if (cacheGraphic != null )

336

{

337	int count = cacheGraphic.Count;

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

339

{

340	// 判斷經度,緯度

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	// 運作到此則該點在目前地圖範圍内,将該點加入到地圖中

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

346	cacheGraphic.Remove(cacheGraphic[i]);

347	count--;    // 當從集合中移除元素時應該把 count 減1

348	i--;        // 元素被移除後相當于目前元素的後一位元素會 -1,應該再循環一次本次循環是以應該 -1

349	continue ;

350

}

351

}

352

}

353

}

354

355	/// <summary>

356	/// 将所有元素畫到地圖上

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 這個類都寫出來了也為了我寫下一篇文章做準備吧！後面會寫一篇動态加載資料點的文章！因為當大批量點(2000)左右加載到地圖上的時候，

就會非常的卡，基本都動不了，是以我們要動态去加載這些點。