You have some options, for example:
- You can set the region of control to a triangle.
- You can only paint in a triangular area of the control.
Example 1
In this example, the region of control limited to a triangular shape.
public class TriangularPictureBox:PictureBox
{
protected override void OnPaint(PaintEventArgs pe)
{
using (var p = new GraphicsPath())
{
p.AddPolygon(new Point[] {
new Point(this.Width / 2, 0),
new Point(0, Height),
new Point(Width, Height) });
this.Region = new Region(p);
base.OnPaint(pe);
}
}
}
Example 2
In this example, the painting will be done only on a triangular area of the control.
public class TriangularPictureBox:PictureBox
{
protected override void OnPaint(PaintEventArgs pe)
{
using (var p = new GraphicsPath())
{
p.AddPolygon(new Point[] {
new Point(this.Width / 2, 0),
new Point(0, Height),
new Point(Width, Height) });
pe.Graphics.SetClip(p);
base.OnPaint(pe);
}
}
}
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