8.18. (Optional) GUI and Graphics Case Study: Using Objects with Graphics

Most of the graphics you have seen to this point did not vary each time you executed the program. However, Exercise 6.2 asked you to create a program that generated shapes and colors at random. In that exercise, the drawing changed every time the system called paintComponent to redraw the panel. To create a more consistent drawing that remains the same each time it is drawn, we must store information about the displayed shapes so that we can reproduce them exactly each time the system calls paintComponent.

To do this, we will create a set of shape classes that store information about each shape. We will make these classes “smart” by allowing objects of these classes to ...

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