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

Latest revision as of 17:19, 18 October 2012

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Class: IGPGraphics

Syntax

Delphi:

function DrawBezierF( pen : IGPPen, x1 : Single, y1 : Single, x2 : Single, y2 : Single, x3 : Single, y3 : Single, x4 : Single, y4 : Single ) : TGPGraphics;

C++ Builder:

TGPGraphics __fastcall DrawBezierF( IGPPen pen, float x1, float y1, float x2, float y2, float x3, float y3, float x4, float y4 );

Visual C++ (MFC):

DrawBezierF(  pen,  x1,  y1,  x2,  y2,  x3,  y3,  x4,  y4 );

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;

begin
  AGraphics := TGPGraphics.Create( ACanvas );

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

   //Draw the curve.
  AGraphics.DrawBezierF( TGLPen.Create( aclGreen ), 100.0, 100.0, 200.0, 10.0, 350.0, 50.0, 500.0, 100.0 );

   //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.