Graphics::DrawBeziers(constPen*,constPoint*,INT) method (gdiplusgraphics.h)

The Graphics::DrawBeziers method draws a sequence of connected Bézier splines.

Syntax

Status DrawBeziers(
  [in] const Pen   *pen,
  [in] const Point *points,
  [in] INT         count
);

Parameters

[in] pen

Type: const Pen*

Pointer to a pen that is used to draw the Bézier splines.

[in] points

Type: const Point*

Pointer to an array of Point objects that specify the starting, ending, and control points of the Bézier splines. The ending coordinate of one Bézier spline is the starting coordinate of the next Bézier spline.

[in] count

Type: INT

Integer that specifies the number of elements in the points array.

Return value

Type: Status

If the method succeeds, it returns Ok, which is an element of the Status enumeration.

If the method fails, it returns one of the other elements of the Status enumeration.

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 splines bend.

Examples

The following example draws a pair of Bézier curves.

VOID Example_DrawBeziers(HDC hdc)
{
   Graphics graphics(hdc);

   // Define a Pen object and an array of Point objects.
   Pen greenPen(Color(255, 0, 255, 0), 3);

   Point startPoint(100, 100);
   Point ctrlPoint1(200, 50);
   Point ctrlPoint2(400, 10);
   Point endPoint1(500, 100);
   Point ctrlPoint3(600, 200);
   Point ctrlPoint4(700, 400);
   Point endPoint2(500, 500);

   Point curvePoints[7] = {
      startPoint,
      ctrlPoint1,
      ctrlPoint2,
      endPoint1,
      ctrlPoint3,
      ctrlPoint4,
      endPoint2};

   // Draw the Bezier curves.
   graphics.DrawBeziers(&greenPen, curvePoints, 7);

   // Draw the control and end points.
   SolidBrush redBrush(Color(255, 255, 0, 0));
   graphics.FillEllipse(&redBrush, Rect(100 - 5, 100 - 5, 10, 10));
   graphics.FillEllipse(&redBrush, Rect(500 - 5, 100 - 5, 10, 10));
   graphics.FillEllipse(&redBrush, Rect(500 - 5, 500 - 5, 10, 10));
   SolidBrush blueBrush(Color(255, 0, 0, 255));
   graphics.FillEllipse(&blueBrush, Rect(200 - 5, 50 - 5, 10, 10));
   graphics.FillEllipse(&blueBrush, Rect(400 - 5, 10 - 5, 10, 10));
   graphics.FillEllipse(&blueBrush, Rect(600 - 5, 200 - 5, 10, 10));
   graphics.FillEllipse(&blueBrush, Rect(700 - 5, 400 - 5, 10, 10));
}

Requirements

See also

Bézier Splines

DrawBezier Methods

DrawBeziers

Drawing Bézier Splines

Graphics

Pen

Point