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ArcGIS Engine二次开发学习(14)图层符号选择器的实现

已有 327 次阅读 2018-6-11 20:56 |个人分类:地理信息系统二次开发|系统分类:教学心得

 

图层符号选择器的实现

在上一讲中,我们实现了右键菜单(ContextMenu)的添加与实现,在最后我预留给下一讲的问题是TOCControl控件图层拖拽的实现。后来发现此功能的实现异常简单,只要在TOCControl的属性页中,勾选“Enable Layer Drag and Drop”即可。

这一讲,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:

1.png

1

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:

2.png

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,本讲也着重讲解第二种方式。

1.        直接调用ArcMap中的符号选择器

1)添加ESRI.ArcGIS.DisplayUI的引用。

分别在解决方案管理器和代码中添加引用。

2)添加TOCControlDouble_Click事件。

3)实现TOCControlDouble_Click事件。

因为种方法不是本讲的重点,故不对代码进行分析,有兴趣的读者请自行理解或结合后面的内容理解。代码如下:

private void axTOCControl1_OnDoubleClick(object sender, ITOCControlEvents_OnDoubleClickEvent e)

{

    esriTOCControlItem toccItem = esriTOCControlItem.esriTOCControlItemNone;

    ILayer iLayer = null;

    IBasicMap iBasicMap = null;

    object unk = null;

    object data = null;

    if (e.button == 1)

    {

        axTOCControl1.HitTest(e.x, e.y, ref toccItem, ref iBasicMap, ref iLayer, ref unk,

            ref data);

        System.Drawing.Point pos = new System.Drawing.Point(e.x, e.y);

        if (toccItem == esriTOCControlItem.esriTOCControlItemLegendClass)

        {

            ESRI.ArcGIS.Carto.ILegendClass pLC = new LegendClassClass();

            ESRI.ArcGIS.Carto.ILegendGroup pLG = new LegendGroupClass();

            if (unk is ILegendGroup)

            {

                pLG = (ILegendGroup)unk;

            }

            pLC = pLG.get_Class((int)data);

            ISymbol pSym;

            pSym = pLC.Symbol;

            ESRI.ArcGIS.DisplayUI.ISymbolSelector pSS = new

                ESRI.ArcGIS.DisplayUI.SymbolSelectorClass();

            bool bOK = false;

            pSS.AddSymbol(pSym);

            bOK = pSS.SelectSymbol(0);

            if (bOK)

            {

                pLC.Symbol = pSS.GetSymbolAt(0);

            }

            this.axMapControl1.ActiveView.Refresh();

            this.axTOCControl1.Refresh();

        }

    }

}

4)编译运行即可。

2.        自定义符号选择器

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。

2.1     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SymboloryControlPictureBoxButtonLabelNumericUpDownGroupBoxColorDialogOpenFileDialogContextMenuStrip控件。控件布局如下所示:

3.jpg

2.2     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

其它

SymbologyControl

axSymbologyControl



PictureBox

ptbPreview



Label

lblColor

颜色


Label

lblSize

大小


Label

lblWidth

线宽


Label

lblAngle

角度


Label

lblOutlineColor

外框颜色


NumericUpDown

nudSize



NumericUpDown

nudWidth



NumericUpDown

nudAngle



Button

btnColor

(设置为空)


Button

btnOutlineColor

(设置为空)


Button

btnMoreSymbols

更多符号


Button

btnOK

确定

DialogResult属性设为OK

Button

btnCancel

取消


GroupBox

groupBox1

预览


GroupBox

groupBox2

设置


ColorDialog

colorDialog



OpenFileDialog

openFileDialog


Filter属性设置为:

Styles 文件|*.ServerStyle

ContextMenuStrip

contextMenuStripMoreSymbol



2.3     添加引用

在解决方案资源管理器中添加ArcGIS EngineESRI.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SymbolControlSymbologyStyleClass设置函数SetFeatureClassStyle(),代码如下:

/// <summary>

/// 初始化SymbologyControlStyleClass,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SymbolSelectorFrmLoad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SymbologyControlStyleClass,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SymbologyControlDoubleClick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)       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SymbologyControlOnStyleClassChanged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;

    }

}

2.5     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:

/// <summary>

/// 双击TOCControl控件时触发的事件

/// </summary>

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

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

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.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.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);

                    //设置新的符号

                    pLegendClass.Symbol = SymbolSelectorFrm.pSymbol;

                    //更新主Map控件和图层控件

                    this.axMapControl1.ActiveView.Refresh();

                    this.axTOCControl1.Refresh();

                }

 

        }

}

       F5编译运行,相信你已经看到自己新手打造的符号选择器已经出现在眼前了。当然,它还比较简陋,下面我们将一起把它做得更完美些。

2.6     符号参数调整

在地图整饰中,符号参数的调整是必须的功能。下面我们将实现符号颜色、外框颜色、线宽、角度等参数的调整。

(1)       添加SymbologyControlOnItemSelected事件,此事件在鼠标选中符号时触发,此时显示出选定符号的初始参数,事件响应函数代码如下:

/// <summary>

/// 选中符号时触发的事件

/// </summary>

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

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

private void axSymbologyControl_OnItemSelected(object sender, ESRI.ArcGIS.Controls.ISymbologyControlEvents_OnItemSelectedEvent e)

{

    pStyleGalleryItem = (IStyleGalleryItem)e.styleGalleryItem;

    Color color;

    switch (this.axSymbologyControl.StyleClass)

    {

            //点符号

        case esriSymbologyStyleClass.esriStyleClassMarkerSymbols:

            color = this.ConvertIRgbColorToColor(((IMarkerSymbol)pStyleGalleryItem.Item).Color as IRgbColor);

            //设置点符号角度和大小初始值

            this.nudAngle.Value = (decimal)((IMarkerSymbol)this.pStyleGalleryItem.Item).Angle;

            this.nudSize.Value = (decimal)((IMarkerSymbol)this.pStyleGalleryItem.Item).Size;

            break;

            //线符号

        case esriSymbologyStyleClass.esriStyleClassLineSymbols:

            color = this.ConvertIRgbColorToColor(((ILineSymbol)pStyleGalleryItem.Item).Color as IRgbColor);

            //设置线宽初始值

            this.nudWidth.Value = (decimal)((ILineSymbol)this.pStyleGalleryItem.Item).Width;

            break;

            //面符号

        case esriSymbologyStyleClass.esriStyleClassFillSymbols:

            color = this.ConvertIRgbColorToColor(((IFillSymbol)pStyleGalleryItem.Item).Color as IRgbColor);

            this.btnOutlineColor.BackColor = this.ConvertIRgbColorToColor(((IFillSymbol)pStyleGalleryItem.Item).Outline.Color as IRgbColor);

            //设置外框线宽度初始值

            this.nudWidth.Value = (decimal)((IFillSymbol)this.pStyleGalleryItem.Item).Outline.Width;

            break;

        default:

            color = Color.Black;

            break;

    }

    //设置按钮背景色

    this.btnColor.BackColor = color;

    //预览符号

    this.PreviewImage();

}

(2)       调整点符号的大小

添加nudSize控件的ValueChanged事件,即在控件的值改变时响应此事件,然后重新设置点符号的大小。代码如下:

/// <summary>

/// 调整符号大小-点符号

/// </summary>

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

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

private void nudSize_ValueChanged(object sender, EventArgs e)

{

    ((IMarkerSymbol)this.pStyleGalleryItem.Item).Size = (double)this.nudSize.Value;

    this.PreviewImage();

}

(3)       调整点符号的角度

添加nudAngle控件的ValueChanged事件,以重新设置点符号的角度。代码如下:

/// <summary>

/// 调整符号角度-点符号

/// </summary>

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

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

private void nudAngle_ValueChanged(object sender, EventArgs e)

{

    ((IMarkerSymbol)this.pStyleGalleryItem.Item).Angle = (double)this.nudAngle.Value;

    this.PreviewImage();

}

(4)       调整线符号和面符号的线宽

添加nudWidth控件的ValueChanged事件,以重新设置线符号的线宽和面符号的外框线的线宽。代码如下:

/// <summary>

/// 调整符号宽度-限于线符号和面符号

/// </summary>

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

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

private void nudWidth_ValueChanged(object sender, EventArgs e)

{

    switch (this.axSymbologyControl.StyleClass)

    {

        case esriSymbologyStyleClass.esriStyleClassLineSymbols:

            ((ILineSymbol)this.pStyleGalleryItem.Item).Width = Convert.ToDouble(this.nudWidth.Value);

            break;

        case esriSymbologyStyleClass.esriStyleClassFillSymbols:

            //取得面符号的轮廓线符号

            ILineSymbol pLineSymbol = ((IFillSymbol)this.pStyleGalleryItem.Item).Outline;

            pLineSymbol.Width = Convert.ToDouble(this.nudWidth.Value);

            ((IFillSymbol)this.pStyleGalleryItem.Item).Outline = pLineSymbol;

            break;

    }

    this.PreviewImage();

}

(5)       颜色转换

ArcGIS Engine中,颜色由IRgbColor接口实现,而在.NET框架中,颜色则由Color结构表示。故在调整颜色参数之前,我们必须完成以上两种不同颜色表示方式的转换。关于这两种颜色结构的具体信息,请大家自行查阅相关资料。下面添加两个颜色转换函数。

ArcGIS Engine中的IRgbColor接口转换至.NET中的Color结构的函数:

/// <summary>

/// ArcGIS Engine中的IRgbColor接口转换至.NET中的Color结构

/// </summary>

/// <param name="pRgbColor">IRgbColor</param>

/// <returns>.NET中的System.Drawing.Color结构表示ARGB颜色</returns>

public Color ConvertIRgbColorToColor(IRgbColor pRgbColor)

{

    return ColorTranslator.FromOle(pRgbColor.RGB);

}

.NET中的Color结构转换至于ArcGIS Engine中的IColor接口的函数:

/// <summary>

/// .NET中的Color结构转换至于ArcGIS Engine中的IColor接口

/// </summary>

/// <param name="color">.NET中的System.Drawing.Color结构表示ARGB颜色</param>

/// <returns>IColor</returns>

public IColor ConvertColorToIColor(Color color)

{

    IColor pColor = new RgbColorClass();

    pColor.RGB = color.B * 65536 + color.G * 256 + color.R;

    return pColor;

}

(6)       调整所有符号的颜色

选择颜色时,我们调用.NET的颜色对话框ColorDialog,选定颜色后,修改颜色按钮的背景色为选定的颜色,以方便预览。双击btnColor按钮,添加如下代码:

/// <summary>

/// 颜色按钮

/// </summary>

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

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

private void btnColor_Click(object sender, EventArgs e)

{

    //调用系统颜色对话框

    if (this.colorDialog.ShowDialog() == DialogResult.OK)

    {

        //将颜色按钮的背景颜色设置为用户选定的颜色

        this.btnColor.BackColor = this.colorDialog.Color;

        //设置符号颜色为用户选定的颜色

        switch (this.axSymbologyControl.StyleClass)

        {

            //点符号

            case esriSymbologyStyleClass.esriStyleClassMarkerSymbols:

                ((IMarkerSymbol)this.pStyleGalleryItem.Item).Color = this.ConvertColorToIColor(this.colorDialog.Color);

                break;

            //线符号

            case esriSymbologyStyleClass.esriStyleClassLineSymbols:

                ((ILineSymbol)this.pStyleGalleryItem.Item).Color = this.ConvertColorToIColor(this.colorDialog.Color);

                break;

            //面符号

            case esriSymbologyStyleClass.esriStyleClassFillSymbols:

                ((IFillSymbol)this.pStyleGalleryItem.Item).Color = this.ConvertColorToIColor(this.colorDialog.Color);

                break;

        }

        //更新符号预览

        this.PreviewImage();

    }

}

(7)       调整面符号的外框线颜色

同上一步类似,双击btnOutlineColor按钮,添加如下代码:

/// <summary>

/// 外框颜色按钮

/// </summary>

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

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

private void btnOutlineColor_Click(object sender, EventArgs e)

{

    if (this.colorDialog.ShowDialog() == DialogResult.OK)

    {

        //取得面符号中的外框线符号

        ILineSymbol pLineSymbol = ((IFillSymbol)this.pStyleGalleryItem.Item).Outline;

        //设置外框线颜色

        pLineSymbol.Color = this.ConvertColorToIColor(this.colorDialog.Color);

        //重新设置面符号中的外框线符号

        ((IFillSymbol)this.pStyleGalleryItem.Item).Outline = pLineSymbol;

        //设置按钮背景颜色

        this.btnOutlineColor.BackColor = this.colorDialog.Color;

        //更新符号预览

        this.PreviewImage();

    }

}

       至此,你可以编译运行程序,看看效果如何,是不是感觉很不错了?我们已经能够修改符号的参数,自定义符号了。

       但是,SymbologyControl默认加载的是ESRI.ServerStyle文件的样式,用过ArcMap的你可能已经注意到,ArcMap中的Symbol Selector有一个“More Symbols”按钮,可以加载其它的符号和ServerStyle文件。3sdnMap当然“一个都不能少”。

2.7     添加更多符号菜单

还记得我们在开始的时候添加了ContextMenuStrip控件吗?现在它终于派上用场了。我们要实现的功能是:单击“更多符号”弹出菜单(ContextMenu),菜单中列出了ArcGIS自带的其它符号,勾选相应的菜单项就可以在SymbologyControl中增加相应的符号。在菜单的最后一项是“添加符号”,选择这一项时,将弹出打开文件对话框,我们可以由此选择其它的ServerStyle文件,以加载更多的符号。

(1)       定义全局变量

SymbolSelectorFrm中定义如下全局变量,用于判断菜单是否已经初始化。

//菜单是否已经初始化标志

bool contextMenuMoreSymbolInitiated = false;

(2)       双击“更多符号”按钮,添加Click事件。

在此事件响应函数中,我们要完成ServerStyle文件的读取,将其文件名作为菜单项名称生成菜单并显示菜单。代码如下:

/// <summary>

/// “更多符号按下时触发的事件

/// </summary>

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

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

private void btnMoreSymbols_Click(object sender, EventArgs e)

{

    if (this.contextMenuMoreSymbolInitiated == false)

    {

        string sInstall = ReadRegistry("SOFTWARE\\ESRI\\CoreRuntime");

        string path = System.IO.Path.Combine(sInstall, "Styles");

        //取得菜单项数量

        string[] styleNames = System.IO.Directory.GetFiles(path, "*.ServerStyle");

        ToolStripMenuItem[] symbolContextMenuItem = new ToolStripMenuItem[styleNames.Length + 1];

        //循环添加其它符号菜单项到菜单

        for (int i = 0; i < styleNames.Length; i++)

        {

            symbolContextMenuItem[i] = new ToolStripMenuItem();

            symbolContextMenuItem[i].CheckOnClick = true;

            symbolContextMenuItem[i].Text = System.IO.Path.GetFileNameWithoutExtension(styleNames[i]);

            if (symbolContextMenuItem[i].Text == "ESRI")

            {

                symbolContextMenuItem[i].Checked = true;

            }

            symbolContextMenuItem[i].Name = styleNames[i];

        }

        //添加更多符号菜单项到菜单最后一项

        symbolContextMenuItem[styleNames.Length] = new ToolStripMenuItem();

        symbolContextMenuItem[styleNames.Length].Text = "添加符号";

        symbolContextMenuItem[styleNames.Length].Name = "AddMoreSymbol";

 

        //添加所有的菜单项到菜单

        this.contextMenuStripMoreSymbol.Items.AddRange(symbolContextMenuItem);

        this.contextMenuMoreSymbolInitiated = true;

    }

    //显示菜单

    this.contextMenuStripMoreSymbol.Show(this.btnMoreSymbols.Location);

}

(3)       添加contextMenuStripMoreSymbol控件的ItemClicked事件。

当单击某一菜单项时响应ItemClicked事件,将选中的ServerStyle文件导入到SymbologyControl中并刷新。当用户单击“添加符号”菜单项时,弹出打开文件对话框,供用户选择其它的ServerStyle文件。代码如下:

/// <summary>

/// “更多符号按钮弹出的菜单项单击事件

/// </summary>

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

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

private void contextMenuStripMoreSymbol_ItemClicked(object sender, ToolStripItemClickedEventArgs e)

{

    ToolStripMenuItem pToolStripMenuItem = (ToolStripMenuItem)e.ClickedItem;

    //如果单击的是添加符号

    if (pToolStripMenuItem.Name == "AddMoreSymbol")

    {

        //弹出打开文件对话框

        if (this.openFileDialog.ShowDialog() == DialogResult.OK)

        {

            //导入style fileSymbologyControl

            this.axSymbologyControl.LoadStyleFile(this.openFileDialog.FileName);

            //刷新axSymbologyControl控件

            this.axSymbologyControl.Refresh();

        }

    }

    else//如果是其它选项

    {

        if (pToolStripMenuItem.Checked == false)

        {

            this.axSymbologyControl.LoadStyleFile(pToolStripMenuItem.Name);

            this.axSymbologyControl.Refresh();

        }

        else

        {

            this.axSymbologyControl.RemoveFile(pToolStripMenuItem.Name);

            this.axSymbologyControl.Refresh();          

        }

    }          

}   

 




http://blog.sciencenet.cn/blog-3373120-1118496.html

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