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Graphics Programming with GDI+ by Mahesh Chand

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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); ...

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