CIS 068 / 2: Lab-Assignment #4: The Magical Sketchpad

• The control or input - window
• The output - window

The control window provides a sketchpad, some control-boxes and a button.
The output window consists of four square panels, composed in a way to build one big square area.

Every mouse movement that occurs inside the sketchpad of the control window is transferred to each of the 4 output panels, forcing them to draw a circle at the specified position (see figure above). Therefore it is possible to draw sketches in the output-area by moving the mouse over the sketchpad.

The controls influence the output in the following way:
Each of the 4 output areas is assigned to 3 checkboxes:

• draw: if unchecked: don't draw on specified area
• flip horizontally: change the outputs x-coordinate (flip left and right)
• flip vertically: change the outputs y-coordinate (flip up and down)

• The easiest way to create the two basic windows is to create instances of JFrame (or derived own classes, if required by your design)
• The input-window's layout should be a BorderLayout, adding the sketchpad into the center, the controls into the west, the erase-button into the south.
• The controls should be collected in their own JPane, using a GridLayout.
• The output-window should use a 2 x 2 GridLayout

You might have recognized, that this assignment deals with GUI-elements and events. Think about the question, which elements are event-sources, which elements are listeners !