CIS 260 TestShapes.java

Code

/*
    TestShapes.java
    CIS 260
    2005-02-11
    David Klick

    This is the implementation of the TestShapes program as an
    Applet. This program is used to test out the classes and
    interface we have been building in class:
        interface Drawable
        class Shape
          +-- class Circle
          +-- class Rectangle
    The way the Shapes are created as either Circles or
    Rectangles, stored as Shape references, and then used
    for a method they both implement differently demonstrates
    polymorphism.
*/

/*
<applet code="TestShapes.class" width="400" height="400">
</applet>
*/

import java.awt.*;
import java.applet.*;

public class TestShapes extends Applet {
    private Shape[] shapes = new Shape[10];

    public void init() {
        int x, y, r, w, h, n, i;
        for (i=0; i<shapes.length; i++) {
            n = (int) Math.floor(Math.random() * 2);
            switch (n) {
            case 0:
                x = (int) Math.floor(Math.random() * 100) + 150;
                y = (int) Math.floor(Math.random() * 100) + 150;
                r = (int) Math.floor(Math.random() * 150);
                shapes[i] = new Circle(x, y, r);
                break;
            default:
                x = (int) Math.floor(Math.random() * 150);
                y = (int) Math.floor(Math.random() * 150);
                w = (int) Math.floor(Math.random() * (300-x));
                h = (int) Math.floor(Math.random() * (300-y));
                shapes[i] = new Rectangle(x, y, w, h);
            }
        }
    }

    public void paint(Graphics g) {
        for (int i=0; i<shapes.length; i++) {
            shapes[i].draw(g);
        }
    }
}