GDI+ Rectangle and Regions in VB.NET

In this article I will explain about Rectangle and Regions in GDI+.
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In this article we will discuss addition functionality of rectangles and regions.

We will cover the following key topics:

  • .NET Framework objects that work with rectangles and regions and their members.
  • Graphics class members that work with rectangle and regions
  • Writing application using objects
  • The Rectangle structure and its members
  • The Region class and its members
  • Invalidating and clipping regions
  • Examples of real-world application using regions and rectangles

A rectangle has three properties: starting point, height, and width. Figure 6.1 shows these properties where the starting point is the top left.

Suppose you wanted to draw a rectangle from point (1,2) with height 7 and width 6. The final rectangle would look like Figure 6.2.

The filled rectangle occupies the entire within the range of its height and width.

FIGURE 6.1: A rectangle


FIGURE 6.2: A rectangle with starting point (1,2), height 7, and width 6

The Rectangle Structure

A rectangle object stores the top left corner and height and width of a rectangle region. In this section we will see how to create and use the rectangle structure.


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