1 The FrameBuffer Class: The FrameBuffer class is a simulation of a frame buffer in a graphis card. In essence, this class is an encapsulation of a rectangular array of pixels. A FrameBuffer object contains 501x501 pixels, with the lower left corner at -250,-250 and the upper left corner at 250,250.

The FrameBuffer class has the following methods of consequence:

• The clear(Color c) method fills all of the pixels in the FrameBuffer with the given Color. (Note: The Color class is in the package java.awt. So, any class that uses it must include import java.awt.Color; before the class declaration.)
• The setPixel(int x, int y, Color c) sets the color of the given pixel.
• The show() method causes the FrameBuffer to show itself "on screen".

2 The GraphicsWindow Class: A GraphicsWindow is a GUI window that contains a FrameBuffer object.

The GraphicsWindow class has the following methods of consequence:

• The default constructor will construct and display a GraphicsWindow object. Regardless of its size, this window will have a 501x501 pixel FrameBuffer. As much of the FrameBuffer as possible will be displayed if the window is too small.
• The getFrameBuffer() method returns the FrameBuffer object associated with this window.

3 An Example: The following application illustrates how these classes might be used:

SimpleApplication.java