ArcEngine 创建IElement简单例子 C#代码

代码下载地址:http://files.cnblogs.com/ogis/MapControlApplication2.rar

以下几个函数功能主要是向地图中添加IElement,一共四个函数:

GetColor,CreateSimpleLineSymbol,CreateSimpleFillSymbol,AddCreateElement

功能函数:AddCreateElement

调用例子:

ISymbol pSymbol = AEUtil.CreateSimpleFillSymbol(Color.Red, 100, esriSimpleFillStyle.esriSFSCross);
AEUtil.AddCreateElement(pFeature.ShapeCopy, m_MapControl.ActiveView, pSymbol, fucosKey);

通过red green blue 三色创建IRgbColor

　public static IRgbColor GetColor(int r, int g, int b)
{
RgbColor color = new RgbColor();
color.Red = r;
color.Green = g;
color.Blue = b;
return color;
}

创建简单线Symbol　　输入参数 color-颜色,width-宽度,style-线型,有七种线型可选

　　esriSLSSolid
　　esriSLSDash
　　esriSLSDot
　　esriSLSDashDot
　　esriSLSDashDotDot
　　esriSLSNull
　　esriSLSInsideFrame

public static ISymbol CreateSimpleLineSymbol(Color color, int width, esriSimpleLineStyle style)
{
ISimpleLineSymbol pSimpleLineSymbol;
pSimpleLineSymbol = new SimpleLineSymbol();
pSimpleLineSymbol.Width = width;
pSimpleLineSymbol.Color = GetColor(color.R, color.G, color.B);
pSimpleLineSymbol.Style = style;
return (ISymbol)pSimpleLineSymbol;

}

创建面填充ISymbol对象. 　　fillColor-颜色,oLineWidth-外廓线宽,fillStyle-填充类型,有以下可选

　　esriSFSSolid
　　esriSFSNull
　　esriSFSHollow
　　esriSFSHorizontal
　　esriSFSVertical
　　esriSFSForwardDiagonal
　　esriSFSBackwardDiagonal
　　esriSFSCross
　　esriSFSDiagonalCross

public static ISymbol CreateSimpleFillSymbol(Color fillColor, int oLineWidth, esriSimpleFillStyle fillStyle)
{
ISimpleFillSymbol pSimpleFillSymbol;
pSimpleFillSymbol = new SimpleFillSymbol();
pSimpleFillSymbol.Style = fillStyle;
pSimpleFillSymbol.Color = GetColor(fillColor.R, fillColor.G, fillColor.B);
pSimpleFillSymbol.Outline = (ILineSymbol)CreateSimpleLineSymbol(fillColor, 1, esriSimpleLineStyle.esriSLSDash);
return (ISymbol)pSimpleFillSymbol;

}

　　函数实现向地图中添加元素,pGeometry-元素形状,pActiveView-地图视图,pSymbol-符号,key-元素属性

public static IElement AddCreateElement(IGeometry pGeometry, IActiveView pActiveView, ISymbol pSymbol, string key)
{
try
{
IGraphicsContainer pGraphicsContainer = pActiveView.GraphicsContainer;
IElement pElement = null;
ILineElement pLineElement = null;
IFillShapeElement pFillShapeElement = null;
IMarkerElement pMarkerElement = null;
ICircleElement pCircleElement = null;
IElementProperties pElmentProperties = null;
switch (pGeometry.GeometryType)
{

case esriGeometryType.esriGeometryEnvelope:
{
pElement = new RectangleElement();
pElement.Geometry = pGeometry;
pFillShapeElement = (IFillShapeElement)pElement;
pFillShapeElement.Symbol = (IFillSymbol)pSymbol;
break;
}
case esriGeometryType.esriGeometryPolyline:
{
pElement = new LineElement();
pElement.Geometry = pGeometry;

pLineElement = (ILineElement)pElement;
pLineElement.Symbol = (ILineSymbol)pSymbol;
break;
}
case esriGeometryType.esriGeometryLine:
{
pElement = new LineElement();
pElement.Geometry = pGeometry;

pLineElement = (ILineElement)pElement;
pLineElement.Symbol = (ILineSymbol)pSymbol;
break;
}
case esriGeometryType.esriGeometryPolygon:
{
pElement = new PolygonElement();
pElement.Geometry = pGeometry;
pFillShapeElement = (IFillShapeElement)pElement;

pFillShapeElement.Symbol = (IFillSymbol)pSymbol;
break;
}
case esriGeometryType.esriGeometryMultipoint:
case esriGeometryType.esriGeometryPoint:
{
pElement = new MarkerElement();
pElement.Geometry = pGeometry;

pMarkerElement = (IMarkerElement)pElement;

pMarkerElement.Symbol = (IMarkerSymbol)pSymbol;
break;
}
case esriGeometryType.esriGeometryCircularArc:
{
pElement = new CircleElementClass();
pElement.Geometry = pGeometry;

pCircleElement = (ICircleElement)pElement;
break;
}
default:
pElement = null;
break;
}

if (pElement != null)
{
pElmentProperties = pElement as IElementProperties;
pElmentProperties.Name = key;

pGraphicsContainer.AddElement(pElement, 0);
pActiveView.PartialRefresh(esriViewDrawPhase.esriViewBackground, null, pGeometry.Envelope);
return pElement;
}
else
{
return null;
}
}
catch (Exception ex)
{
return null;
}
}