Applications written for Microsoft Windows use rectangles to specify rectangular areas on the screen or in a window. Rectangles are used to describe the client area of a window, areas of the screen that need repaints, and areas for displaying formatted text. Your applications can also use rectangles to fill, frame, or invert a portion of the client area with a given brush, and to retrieve the coordinates of a window or the window's client area.
The dimensions of rectangular regions are described in the WFC Rectangle object. This object consists of x, y, height, and width integers that describe the Rectangle's screen position and dimensions. In addition, you can use the object's getRight and getBottom methods to retrieve the screen position of its right and bottom sides.
For more information, see Rectangle Operations and A Rectangle Example.