ArcGIS Engine 10 开发手册(7-10)ArcGIS Engine中简单图的调用

    本文介绍使用ArcGIS Engine生成简单图的方法。

    ArcGIS Engine生成简单图示例代码

    代码如下：

public class SimpleRender

{

  public SimpleRender (AxMapControl pMapcontrol, IFeatureLayer pFtLayer, String Field)

  {

    IGeoFeatureLayer pGeolayer;

    IActiveView pActiveView;

    pGeolayer = pFtLayer as IGeoFeatureLayer;

    pActiveView = pMapcontrol.ActiveView;

    IFillSymbol pFillSymbol;

    ILineSymbol pLineSymbol;

    pFillSymbol = new SimpleFillSymbolClass ();

    pFillSymbol.Color = GetRGBColor (220, 110, 200);

    pLineSymbol = new SimpleLineSymbolClass ();

    pLineSymbol.Color = GetRGBColor (255, 120, 105);

    pLineSymbol.Width = 2;

    pFillSymbol.Outline = pLineSymbol;

    ISimpleRenderer pSimpleRender; //用什么符号渲染

    pSimpleRender = new SimpleRendererClass ();

    pSimpleRender.Symbol = pFillSymbol as ISymbol;

    pSimpleRender.Description = "China";

    pSimpleRender.Label = "SimpleRender";

    ITransparencyRenderer pTrans;

    pTrans = pSimpleRender as ITransparencyRenderer;

    pTrans.TransparencyField = Field;

    pGeolayer.Renderer = pTrans as IFeatureRenderer;

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

    //地理图层的渲染对象是一个要素渲染对象,而这个对象是由一些相关对象组成的。

    //属性也是一个对象,说明大对象是由小对象组成的。

  }

  private IRgbColor GetRGBColor (int R, int G, int B) //子类赋给父类

  {

    IRgbColor pRGB;

    pRGB = new RgbColorClass ();

    pRGB.Red = R;

    pRGB.Green = G;

    pRGB.Green = B;

    return pRGB;

  }

}

      效果如图