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PhilosopherArea.javaAPI DocExample3347Tue Dec 12 18:57:48 GMT 2000None

PhilosopherArea

public class PhilosopherArea extends Canvas

Fields Summary
PhilAnimator
controller
Image[]
imgs
Chopstick[]
chopsticks
String[]
names
static final int
NUMPHILS
private static final double
MARGIN
private double
spacing
private Philosopher[]
philosophers
private boolean[]
redraw
private boolean
running
Constructors Summary
public PhilosopherArea(PhilAnimator controller)


       
        super();
        this.controller = controller;

        MediaTracker mt;
        mt = new MediaTracker(this);

        imgs[0] = controller.getImage(controller.getCodeBase(),
				      "hungryduke.gif");
        mt.addImage(imgs[0], 0);
        imgs[1] = controller.getImage(controller.getCodeBase(),
				      "rightspoonduke.gif");
        mt.addImage(imgs[1], 1);
        imgs[2] = controller.getImage(controller.getCodeBase(),
				      "bothspoonsduke.gif");
        mt.addImage(imgs[2], 2);

        try {
            mt.waitForID(0);
            mt.waitForID(1);
            mt.waitForID(2);
        } catch (java.lang.InterruptedException e) {
            System.out.println("Couldn't load one of the images");
        }

        spacing = imgs[0].getWidth(this) + MARGIN;
        createPhilosophersAndChopsticks();
Methods Summary
public voidcreatePhilosophersAndChopsticks()

        double x, y;
        double radius = 80.0;
        double centerAdj = 85.0;
        double radians;

/* for a straight line
        y = MARGIN;
*/
        for (int i = 0; i < NUMPHILS; i++)
            chopsticks[i] = new Chopstick();

        for (int i = 0; i < NUMPHILS; i++) {
/* for a straight line
            x = i * spacing;
*/
            radians = i*(2.0 * Math.PI /(double)NUMPHILS);
            x = Math.sin(radians) * radius + centerAdj; 
            y = Math.cos(radians) * radius + centerAdj; 
            philosophers[i] = new Philosopher(this, x, y, i);
            repaintPhil(i);   
        }
public booleanmouseDown(java.awt.Event evt, int x, int y)

        if (running) {
            for (int i = 0; i < NUMPHILS; i++)
                philosophers[i].suspend();
        } else {
            for (int i = 0; i < NUMPHILS; i++)
                philosophers[i].resume();
        }

        running = !running;
        return true;
public voidpaint(java.awt.Graphics g)

        g.setColor(Color.lightGray);
        g.fillRect(0, 0, size().width, size().height);
        for (int i = 0; i < NUMPHILS; i++) {
            redraw[i] = true;
        }
        update(g);
public synchronized voidrepaintPhil(int id)

        redraw[id] = true;
        repaint();
public voidstartPhilosophers()

        for (int i = 0; i < NUMPHILS; i++)
            philosophers[i].start();
        running = true;
public voidstopPhilosophers()

        for (int i = 0; i < NUMPHILS; i++)
            philosophers[i].stopRequested();
public voidupdate(java.awt.Graphics g)

        for (int i = 0; i < NUMPHILS; i++) {
            if (redraw[i]) {
                philosophers[i].paint(g);
                redraw[i] = false;
            }
        }