How to: Draw a Single Bézier Spline

A Bézier spline is defined by four points: a start point, two control points, and an endpoint.


The following example draws a Bézier spline with start point (10, 100) and endpoint (200, 100). The control points are (100, 10) and (150, 150).

The following illustration shows the resulting Bézier spline along with its start point, control points, and endpoint. The illustration also shows the spline's convex hull, which is a polygon formed by connecting the four points with straight lines.

Bezier Spline

Point p1 = new Point(10, 100);   // Start point
Point c1 = new Point(100, 10);   // First control point
Point c2 = new Point(150, 150);  // Second control point
Point p2 = new Point(200, 100);  // Endpoint

Pen pen = new Pen(Color.FromArgb(255, 0, 0, 255));
e.Graphics.DrawBezier(pen, p1, c1, c2, p2);
Dim p1 As New Point(10, 100) ' Start point
Dim c1 As New Point(100, 10) ' First control point
Dim c2 As New Point(150, 150) ' Second control point
Dim p2 As New Point(200, 100) ' Endpoint

Dim pen As New Pen(Color.FromArgb(255, 0, 0, 255))
e.Graphics.DrawBezier(pen, p1, c1, c2, p2)

Compiling the Code

The preceding example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler.

See Also

Bézier Splines in GDI+
How to: Draw a Sequence of Bézier Splines