arcengine 跨屏幕画多边并计算面积
//Color函数
private IRgbColor GetRGBColor(int red, int green, int blue)
{
IRgbColor rgb = new RgbColorClass();
rgb.Red = red;
rgb.Green = green;
rgb.Blue = blue;
return rgb;
}
private IPolygon DrawPolygon()
{
IActiveView pActiveView;
ISimpleFillSymbol pSimpleFillSymbol;
IRubberBand pRubberBand;
IPolygon pPolygon;
pActiveView = (IActiveView)axMapControl1.Map;
pSimpleFillSymbol = new SimpleFillSymbolClass();
pSimpleFillSymbol.Color = GetRGBColor(255, 22, 11);
pRubberBand = new RubberPolygonClass();
//pPolygon =pRubberBand .TrackNew (pActiveView .ScreenDisplay ,(ISymbol )pSimpleFillSymbol );
pPolygon = (IPolygon)pRubberBand.TrackNew(pActiveView.ScreenDisplay, (ISymbol)pSimpleFillSymbol);
pActiveView.ScreenDisplay.StartDrawing(pActiveView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
pActiveView.ScreenDisplay.SetSymbol((ISymbol)pSimpleFillSymbol);
pActiveView.ScreenDisplay.DrawPolygon((IGeometry)pPolygon);
pActiveView.ScreenDisplay.FinishDrawing();
return pPolygon;
}
private Double MeasurePolygon(IPolygon pPolygon)
{
IArea pArea = (IArea)pPolygon;
Double dArea = Math.Abs(pArea.Area);
return dArea;
}
private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)
{
//if (boolAreaMeasure)
{
IPolygon pPloygon;
Double dArea;
pPloygon = DrawPolygon();
dArea = MeasurePolygon(pPloygon);
MessageBox.Show(dArea.ToString());
}
}