Engnie中如何创建贝塞尔曲线(Bezier Curve)？

IPoint controlPoints = new IPoint[4]; 

controlPoints[0] = new ESRI.ArcGIS.Geometry.Point(); 

controlPoints[1] = new ESRI.ArcGIS.Geometry.Point(); 

controlPoints[2] = new ESRI.ArcGIS.Geometry.Point(); 

controlPoints[3] = new ESRI.ArcGIS.Geometry.Point(); 



controlPoints[0].PutCoords(0, 10); 

controlPoints[1].PutCoords(10, 10); 

controlPoints[2].PutCoords(0, 0); 

controlPoints[3].PutCoords(10, 0); 



IBezierCurveGEN bezier = new BezierCurveClass(); 

bezier.PutCoords(ref controlPoints); 

IBezierCurve bezierCurve = bezier as IBezierCurve; 



object Missing = Type.Missing; 

ISegmentCollection pSegmentCollection = new PolylineClass(); 

pSegmentCollection.AddSegment(bezierCurve as ISegment, ref Missing, ref Missing); 

IPolyline pPolyline = pSegmentCollection as IPolyline; 



ISimpleLineSymbol pSimpleLineSymbol = new SimpleLineSymbolClass(); 

pSimpleLineSymbol.Width = 2; 



IActiveView pActiveView = axMapControl1.Map as IActiveView; 

IScreenDisplay pScreenDisplay = pActiveView.ScreenDisplay; 

pScreenDisplay.StartDrawing(pScreenDisplay.hDC, 0); 

pScreenDisplay.SetSymbol(pSimpleLineSymbol as ISymbol); 

pScreenDisplay.DrawPolyline(pPolyline); 

pScreenDisplay.FinishDrawing();