Graphics.DrawBeziers Method (Pen, Point[])


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Draws a series of Bézier splines from an array of Point structures.

Namespace:   System.Drawing
Assembly:  System.Drawing (in System.Drawing.dll)

public void DrawBeziers(
	Pen pen,
	Point[] points


Type: System.Drawing.Pen

Pen that determines the color, width, and style of the curve.

Type: System.Drawing.Point[]

Array of Point structures that represent the points that determine the curve. The number of points in the array should be a multiple of 3 plus 1, such as 4, 7, or 10.

Exception Condition

pen is null.


points is null.

The number of points in the array should be a multiple of 3 plus 1 because the first spline requires 4 points and any other splines require 3 points each. The first Bézier spline is drawn from the first point to the fourth point in the point array. The second and third points are control points that determine the shape of the curve. Each subsequent curve needs exactly three more points: two more control points and an ending point. The ending point of the previous curve is used as the starting point for each additional curve.

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:

  • Creates a black pen.

  • Creates the start, end, and two control points for a first curve and endpoint and two control points for a second curve.

  • Draws the successive Bézier curves to the screen.

private void DrawBeziersPoint(PaintEventArgs e)
    // Create pen.
    Pen blackPen = new Pen(Color.Black, 3);

    // Create points for curve.
    Point start = new Point(100, 100);
    Point control1 = new Point(200, 10);
    Point control2 = new Point(350, 50);
    Point end1 = new Point(500, 100);
    Point control3 = new Point(600, 150);
    Point control4 = new Point(650, 250);
    Point end2 = new Point(500, 300);
    Point[] bezierPoints =
                 start, control1, control2, end1,
                 control3, control4, end2

    // Draw arc to screen.
    e.Graphics.DrawBeziers(blackPen, bezierPoints);

.NET Framework
Available since 1.1
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