Graphics Programming with GDI+

6.4. Clipping Regions Example

Listing 6.14 uses Xor to clip regions.

Listing 6.14. Using the Xor method

Pen pen = new Pen(Color.Red, 5); SolidBrush brush = new SolidBrush(Color.Red); Rectangle rect1 = new Rectangle(50, 0, 50, 150); Rectangle rect2 = new Rectangle(0, 50, 150, 50); Region region = new Region(rect1); region.Xor(rect2); g.FillRegion(brush, region);

Figure 6.14 shows the output from Listing 6.14.

Figure 6.14. Result of the Xor method

Now if we replace Xor with Union:

region.Union(rect2);

the new output looks like Figure 6.15.

Figure 6.15. Result of the Union method

Now let’s replace Union with Exclude:

 region.Exclude(rect2); ...