ArcGIS Engine+C# 初学者实例代码

}

（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：

///

///

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：

///

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：

///

///

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： ///

///