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《ArcGIS Engine+C#实例开发教程》第七讲 图层符号选择器的实现

作者：3SDN.Net    文章来源：3SDN原创    点击数：    更新时间：2009-5-12
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。

2.3     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.Display;

using ESRI.ArcGIS.esriSystem;

using ESRI.ArcGIS.SystemUI;

using ESRI.ArcGIS.Controls;

using ESRI.ArcGIS.Geodatabase;

2.4   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 pSymbolImage;

 

（2）       修改SymbolSelectorFrm的构造函数，传入图层和图例接口。代码如下：

   /// <summary>

/// 构造函数,初始化全局变量

/// </summary>

/// <param name="tempLegendClass">TOC图例</param>

/// <param name="tempLayer">图层</param>

public SymbolSelectorFrm(ILegendClass tempLegendClass, ILayer tempLayer)

{

    InitializeComponent();

    this.pLegendClass = tempLegendClass;

    this.pLayer = tempLayer;

}

（3）       添加SymbolControl的SymbologyStyleClass设置函数SetFeatureClassStyle()，代码如下：

/// <summary>

/// 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

/// </summary>

/// <param name="symbologyStyleClass"></param>

private void SetFeatureClassStyle(esriSymbologyStyleClass symbologyStyleClass)

{

    this.axSymbologyControl.StyleClass = symbologyStyleClass;

    ISymbologyStyleClass pSymbologyStyleClass = this.axSymbologyControl.GetStyleClass(symbologyStyleClass);

    if (this.pLegendClass != null)

    {

        IStyleGalleryItem currentStyleGalleryItem = new ServerStyleGalleryItem();

        currentStyleGalleryItem.Name = "当前符号";

        currentStyleGalleryItem.Item = pLegendClass.Symbol;

        pSymbologyStyleClass.AddItem(currentStyleGalleryItem,0);

        this.pStyleGalleryItem = 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：

    /// <summary>

/// 从注册表中取得指定软件的路径

/// </summary>

/// <param name="sKey"></param>

/// <returns></returns>

private string ReadRegistry(string sKey)

{

    //Open the subkey for reading

    Microsoft.Win32.RegistryKey rk = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(sKey, 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 sInstall = ReadRegistry("SOFTWARE\\ESRI\\CoreRuntime");

//载入ESRI.ServerStyle文件到SymbologyControl

this.axSymbologyControl.LoadStyleFile(sInstall + "\\Styles\\ESRI.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).FeatureClass.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 = 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;

        this.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.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.btnOutlineColor.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 = false;

        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：

    /// <summary>

/// 确定按钮

/// </summary>

/// <param name="sender"></param>

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

private void btnOK_Click(object sender, EventArgs e)

{

    //取得选定的符号

    this.pSymbol = (ISymbol)pStyleGalleryItem.Item;

    //更新预览图像

    this.pSymbolImage = this.ptbPreview.Image;

    //关闭窗体

    this.Close();

}

/// <summary>

/// 取消按钮

/// </summary>

/// <param name="sender"></param>

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

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：

    /// <summary>

/// 双击符号同单击确定按钮，关闭符号选择器。

/// </summary>

/// <param name="sender"></param>

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

private 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：

/// <summary>

/// 把选中并设置好的符号在picturebox控件中预览

/// </summary>

private void PreviewImage()

{

    stdole.IPictureDisp picture = this.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：

    /// <summary>

/// 当样式（Style）改变时，重新设置符号类型和控件的可视性

/// </summary>

/// <param name="sender"></param>

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

private void axSymbologyControl_OnStyleClassChanged(object sender, ESRI.ArcGIS.Controls.ISymbologyControlEvents_OnStyleClassChangedEvent e)

{

    switch ((esriSymbologyStyleClass)(e.symbologyStyleClass))

    {

        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.btnOutlineColor.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.Visible = 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;

            this.lblOutlineColor.Visible = true;

            this.btnOutlineColor.Visible = true;

            break;

    }

}

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