实验三操作步骤.docx

1、实验三操作步骤实验三（一）图层符号选择器的实现1摘要：我们要实现的是图层符号选择器，与ArcMap中的Symbol Selector的类似。本讲较前几讲而言，些许有些复杂，不过只要仔细琢磨，认真操作，你就很容易实现如下所示的符号选择器。 因为本讲篇幅较长，故我将其分成两个阶段，这是第一阶段。图1 在AE开发中，符号选择器有两种实现方式。一是在程序中直接调用ArcMap中的符号选择器，如下所示：图2二是自定义符号选择器，如图1所示。由于第一种方式前提是必须安装ArcGIS Desktop，其界面还是英文的，而对二次开发来说，大部分用户希望应该是中文界面。因此开发人员通常选择第二种方式，本讲也着重

2、讲解第二种方式。自定义符号选择器AE9.3提供了SymbologyControl控件，极大的方便了图层符号选择器的制作。本讲实现的符号选择器有如下功能。用户双击TOCControl控件中图层的符号时，弹出选择符号对话框，对话框能够根据图层类型自动加载相应的符号，如点、线、面。用户可以调整符号的颜色、线宽、角度等参数。还可以打开自定义的符号文件（*.ServerStyle），加载更多的符号。1新建符号选择器窗体新建Winodws窗体，命名为SymbolSelectorFrm，修改窗体的Text属性为“选择符号”。并添加SymbologyControl、GroupBox、PictureBox、Bu

3、tton、Label、NumericUpDown、ColorDialog、Open、ContextMenuStrip控件。控件布局如下所示：AE9.2提供了SymbologyControl控件，极大的方便了图层符号选择器的制作。本讲实现的符号选择器有如下功能。用户双击TOCControl控件中图层的符号时，弹出选择符号对话框，对话框能够根据图层类型自动加载相应的符号，如点、线、面。用户可以调整符号的颜色、线宽、角度等参数。还可以打开自定义的符号文件（*.ServerStyle），加载更多的符号。图32设置控件属性设置相应控件的相关属性，如下表所示(空则不用修改)：控件Name属性Text属性其

4、它SymbologyControlaxSymbologyControlPictureBoxptbPreviewLabellblColor颜色LabellblSize大小LabellblWidth线宽LabellblAngle角度LabellblOutlineColor外框颜色NumericUpDownnudSizeNumericUpDownnudWidthNumericUpDownnudAngleButtonbtnColor（设置为空）ButtonbtnOutlineColor（设置为空）ButtonbtnMoreSymbols更多符号ButtonbtnOK确定DialogResult属性设为

5、OKButtonbtnCancel取消GroupBoxgroupBox1预览GroupBoxgroupBox2设置ColorDialogcolorDialogOpenopenFilter属性设置为：Styles文件|*.ServerStyleContextMenuStripcontextMenuStripMoreSymbol 3添加引用在解决方案资源管理器中添加ArcGIS Engine的ESRI.ArcGIS.Geodatabase引用，在SymbolSelectorFrm.cs文件中添加如下引用代码： using ESRI.ArcGIS.Carto; using ESRI.ArcGIS.D

6、isplay;using ESRI.ArcGIS.esriSystem;using ESRI.ArcGIS.SystemUI;using ESRI.ArcGIS.Controls;using ESRI.ArcGIS.Geodatabase; 4 初始化（1）添加SymbolSelectorFrm的全局变量，代码如下：private IStyleGalleryItem pStyleGalleryItem;private ILegendClass pLegendClass;private ILayer pLayer;public ISymbol pSymbol;public Image pSymb

7、olImage;（2）修改SymbolSelectorFrm的构造函数，传入图层和图例接口。代码如下：/ / 构造函数,初始化全局变量/ / TOC图例/ 图层public SymbolSelectorFrm(ILegendClass tempLegendClass, ILayer tempLayer) InitializeComponent(); this.pLegendClass = tempLegendClass; this.pLayer = tempLayer;（3）添加SymbolControl的SymbologyStyleClass设置函数SetFeatureClassStyle(

8、)，代码如下：/ / 初始化SymbologyControl的StyleClass,图层如果已有符号,则把符号添加到SymbologyControl中的第一个符号,并选中/ / private void SetFeatureClassStyle(esriSymbologyStyleClass symbologyStyleClass) this.axSymbologyControl.StyleClass = symbologyStyleClass; ISymbologyStyleClass pSymbologyStyleClass = this.axSymbologyControl.GetSty

9、leClass(symbologyStyleClass); if (this.pLegendClass != null) IStyleGalleryItem currentStyleGalleryItem = new ServerStyleGalleryItem(); currentStyleGalleryItem.Name = 当前符号; currentStyleGalleryItem.Item = pLegendClass.Symbol; pSymbologyStyleClass.AddItem(currentStyleGalleryItem,0); this.pStyleGalleryI

10、tem = currentStyleGalleryItem; pSymbologyStyleClass.SelectItem(0); （4）添加注册表读取函数ReadRegistry()，此函数从注册表中读取ArcGIS的安装路径，代码如下： / / 从注册表中取得指定软件的路径/ / / private string ReadRegistry(string sKey) /Open the subkey for reading Microsoft.Win32.RegistryKey rk = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(sK

11、ey, true); if (rk = null) return ; / Get the data from a specified item in the key. return (string)rk.GetValue(InstallDir); （5）添加SymbolSelectorFrm的Load事件。根据图层类型为SymbologyControl导入相应的符号样式文件，如点、线、面，并设置控件的可视性。代码如下：private void SymbolSelectorFrm_Load(object sender, EventArgs e)/取得ArcGIS安装路径string sInsta

12、ll = ReadRegistry(SOFTWAREESRICoreRuntime);/载入ESRI.ServerStyle文件到SymbologyControlthis.axSymbologyControl.LoadStyle + StylesESRI.ServerStyle);/确定图层的类型(点线面),设置好SymbologyControl的StyleClass,设置好各控件的可见性(visible)IGeoFeatureLayer pGeoFeatureLayer = (IGeoFeatureLayer)pLayer;switch (IFeatureLayer)pLayer).Feat

13、ureClass.ShapeType) case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPoint:this.SetFeatureClassStyle(esriSymbologyStyleClass.esriStyleClassMarkerSymbols); this.lblAngle.Visible = true; this.nudAngle.Visible = true; this.lblSize.Visible = true; this.nudSize.Visible = true; this.lblWidth.Visible

14、 = false; this.nudWidth.Visible = false; this.lblOutlineColor.Visible = false; this.btnOutlineColor.Visible = false; break; case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolyline: this.SetFeatureClassStyle(esriSymbologyStyleClass.esriStyleClassLineSymbols); this.lblAngle.Visible = false; th

15、is.nudAngle.Visible = false; this.lblSize.Visible = false; this.nudSize.Visible = false; this.lblWidth.Visible = true; this.nudWidth.Visible = true; this.lblOutlineColor.Visible = false; this.btnOutlineColor.Visible = false; break; case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon: this

16、.SetFeatureClassStyle(esriSymbologyStyleClass.esriStyleClassFillSymbols); this.lblAngle.Visible = false; this.nudAngle.Visible = false; this.lblSize.Visible = false; this.nudSize.Visible = false; this.lblWidth.Visible = true; this.nudWidth.Visible = true; this.lblOutlineColor.Visible = true; this.bt

17、nOutlineColor.Visible = true; break; case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryMultiPatch: this.SetFeatureClassStyle(esriSymbologyStyleClass.esriStyleClassFillSymbols); this.lblAngle.Visible = false; this.nudAngle.Visible = false; this.lblSize.Visible = false; this.nudSize.Visible = fal

18、se; this.lblWidth.Visible = true; this.nudWidth.Visible = true; this.lblOutlineColor.Visible = true; this.btnOutlineColor.Visible = true; break; default: this.Close(); break; （6）双击确定按钮和取消按钮，分别添加如下代码： / / 确定按钮/ / / private void btnOK_Click(object sender, EventArgs e) /取得选定的符号 this.pSymbol = (ISymbol)

19、pStyleGalleryItem.Item; /更新预览图像 this.pSymbolImage = this.ptbPreview.Image; /关闭窗体 this.Close();/ / 取消按钮/ / / private void btnCancel_Click(object sender, EventArgs e) this.Close(); （7）为了操作上的方便，我们添加SymbologyControl的DoubleClick事件，当双击符号时同按下确定按钮一样，选定符号并关闭符号选择器窗体。代码如下： / / 双击符号同单击确定按钮，关闭符号选择器。/ / / private

20、 void axSymbologyControl_OnDoubleClick(object sender, ESRI.ArcGIS.Controls.ISymbologyControlEvents_OnDoubleClickEvent e) this.btnOK.PerformClick(); （8）再添加符号预览函数，当用户选定某一符号时，符号可以显示在PictureBox控件中，方便预览，函数代码如下：/ / 把选中并设置好的符号在picturebox控件中预览/ private void PreviewImage() stdole.IPictureDisp picture = this.

21、axSymbologyControl.GetStyleClass(this.axSymbologyControl.StyleClass).PreviewItem(pStyleGalleryItem, this.ptbPreview.Width, this.ptbPreview.Height); System.Drawing.Image image = System.Drawing.Image.FromHbitmap(new System.IntPtr(picture.Handle); this.ptbPreview.Image = image; （9）当SymbologyControl的样式改

22、变时，需要重新设置符号参数调整控件的可视性，故要添加SymbologyControl的OnStyleClassChanged事件，事件代码与Load事件类似，如下： / / 当样式（Style）改变时，重新设置符号类型和控件的可视性/ / / private void axSymbologyControl_OnStyleClassChanged(object sender, ESRI.ArcGIS.Controls.ISymbologyControlEvents_OnStyleClassChangedEvent e) switch (esriSymbologyStyleClass)(e.sym

23、bologyStyleClass) case esriSymbologyStyleClass.esriStyleClassMarkerSymbols: this.lblAngle.Visible = true; this.nudAngle.Visible = true; this.lblSize.Visible = true; this.nudSize.Visible = true; this.lblWidth.Visible = false; this.nudWidth.Visible = false; this.lblOutlineColor.Visible = false; this.b

24、tnOutlineColor.Visible = false; break; case esriSymbologyStyleClass.esriStyleClassLineSymbols: this.lblAngle.Visible = false; this.nudAngle.Visible = false; this.lblSize.Visible = false; this.nudSize.Visible = false; this.lblWidth.Visible = true; this.nudWidth.Visible = true; this.lblOutlineColor.Vi

25、sible = false; this.btnOutlineColor.Visible = false; break; case esriSymbologyStyleClass.esriStyleClassFillSymbols: this.lblAngle.Visible = false; this.nudAngle.Visible = false; this.lblSize.Visible = false; this.nudSize.Visible = false; this.lblWidth.Visible = true; this.nudWidth.Visible = true; th

26、is.lblOutlineColor.Visible = true; this.btnOutlineColor.Visible = true; break; 5 调用自定义符号选择器通过以上操作，本符号选择器雏形已经完成，我们可以3sdnMap主窗体中调用并进行测试。如果您已经完成“直接调用ArcMap中的符号选择器”这一节，请注释axTOCControl1_OnDoubleClick事件响应函数里的代码，并添加如下代码。如果您是直接学习自定义符号选择器这一节的，请先添加axTOCControl1控件的OnDoubleClick事件，再添加如下事件响应函数代码： / / 双击TOCContro

27、l控件时触发的事件/ / / private void axTOCControl1_OnDoubleClick(object sender, ITOCControlEvents_OnDoubleClickEvent e) esriTOCControlItem itemType = esriTOCControlItem.esriTOCControlItemNone; IBasicMap basicMap = null; ILayer layer = null; object unk = null; object data = null; axTOCControl1.HitTest(e.x, e.

28、y, ref itemType, ref basicMap, ref layer, ref unk, ref data); if (e.button = 1) if(itemType=esriTOCControlItem.esriTOCControlItemLegendClass) /取得图例 ILegendClass pLegendClass = (ILegendGroup)unk).get_Class(int)data); /创建符号选择器SymbolSelector实例 SymbolSelectorFrm SymbolSelectorFrm = new SymbolSelectorFrm(pLegendClass, layer); if (SymbolSelectorFrm.ShowDialog() = DialogResult.OK) /局部更新主Map控件 m_mapControl.ActiveView.PartialRefre