Graphics.DrawCurve Method (Pen, PointF[], Single)
Assembly: System.Drawing (in system.drawing.dll)
public void DrawCurve ( Pen pen, PointF[] points, float tension )
public function DrawCurve ( pen : Pen, points : PointF[], tension : float )
Not applicable.
Parameters
- pen
Pen that determines the color, width, and height of the curve.
- points
Array of PointF structures that represent the points that define the curve.
- tension
Value greater than or equal to 0.0F that specifies the tension of the curve.
This method draws a cardinal spline that passes through each point in the array.
The array of points must contain at least three PointF structures for a curve to be drawn.
The tension parameter determines the shape of the spline. If the value of the tension parameter is 0.0F, this method draws straight line segments to connect the points. Usually, the tension parameter is less than or equal to 1.0F. Values over 1.0F produce unusual results.
The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, which is a parameter of the Paint event handler. The code performs the following actions:
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Creates red and green pens.
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Creates seven points to define the curve.
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Draws six red straight lines between the seven points to form an incomplete polygon.
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Creates a tension setting.
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Draws an open green closed curve through the seven points.
The method uses a tension of 1.0.
private: void DrawCurvePointFTension( PaintEventArgs^ e ) { // Create pens. Pen^ redPen = gcnew Pen( Color::Red,3.0f ); Pen^ greenPen = gcnew Pen( Color::Green,3.0f ); // Create points that define curve. PointF point1 = PointF(50.0F,50.0F); PointF point2 = PointF(100.0F,25.0F); PointF point3 = PointF(200.0F,5.0F); PointF point4 = PointF(250.0F,50.0F); PointF point5 = PointF(300.0F,100.0F); PointF point6 = PointF(350.0F,200.0F); PointF point7 = PointF(250.0F,250.0F); array<PointF>^ curvePoints = {point1,point2,point3,point4,point5,point6,point7}; // Draw lines between original points to screen. e->Graphics->DrawLines( redPen, curvePoints ); // Create tension. float tension = 1.0F; // Draw curve to screen. e->Graphics->DrawCurve( greenPen, curvePoints, tension ); }
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.