Method function IGDIPlus.IGPGraphics.DrawBezierF(IGPPen;TGPPointF;TGPPointF;TGPPointF;TGPPointF) : TGPGraphics

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Class: IGPGraphics

Contents

Syntax

Delphi:

function DrawBezierF( pen : IGPPen, pt1 : TGPPointF, pt2 : TGPPointF, pt3 : TGPPointF, pt4 : TGPPointF ) : TGPGraphics;

C++ Builder:

TGPGraphics __fastcall DrawBezierF( IGPPen pen, TGPPointF pt1, TGPPointF pt2, TGPPointF pt3, TGPPointF pt4 );

Visual C++ (MFC):

DrawBezierF(  pen,  pt1,  pt2,  pt3,  pt4 );

Summary

Draws a Bézier spline.

Description

Call this method to draw a Bézier spline.


Example:

The following example draws a Bézier curve.

var
  AGraphics  : IGPGraphics;
  APath      : IGPGraphicsPath;
  ARedBrush  : IGSolidBrush;
  ABlueBrush : IGSolidBrush;

  ASartPoint     : TGPPointF;
  AControlPoint1 : TGPPointF;
  AControlPoint2 : TGPPointF;
  AEndPoint      : TGPPointF;

begin
  AGraphics := TGPGraphics.Create( ACanvas );

  // Set up the pen and curve points.
  Pen greenPen(Color(255, 0, 255, 0));

  AStartPoint := MakePointF(100.0, 100.0);
  AControlPoint1 := MakePointF(200.0, 10.0);
  AControlPoint2 := MakePointF(350.0, 50.0);
  AEndPoint := MakePointF(500.0, 100.0);

  //Draw the curve.
  AGraphics.DrawBezierF( TGLPen.Create( aclGreen ), AStartPoint, AControlPoint1, AControlPoint2, AEndPoint);

  //Draw the end points and control points.
  ARedBrush := TGSolidBrush.Create( aclRed );
  ABlueBrush := TGSolidBrush.Create( aclBlue );

  AGraphics.FillEllipse(ARedBrush, 100 - 5, 100 - 5, 10, 10);
  AGraphics.FillEllipse(ARedBrush, 500 - 5, 100 - 5, 10, 10);
  AGraphics.FillEllipse(ABlueBrush, 200 - 5, 10 - 5, 10, 10);
  AGraphics.FillEllipse(ABlueBrush, 350 - 5, 50 - 5, 10, 10);

Remarks A Bézier spline does not pass through its control points. The control points act as magnets, pulling the curve in certain directions to influence the way the Bézier spline bends.

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