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MovingPolygonApp.java

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package inheritance;

import java.awt.Color;

import java.awt.Graphics;

import java.util.Random;

public class MovingPolygonApp extends PolygonApp {

int maxSpeed;

MovingPolygonApp(int w, int h, boolean tryFSE, int ms) {

super(w, h, tryFSE);

maxSpeed = ms;

}

public void init(int nVertices) {

int width = getWidth();

int height = getHeight();

int[] vx = new int[nVertices];

int[] vy = new int[nVertices];

Random random = getRandom();

int[] x = new int[nVertices];

int[] y = new int[nVertices];

for (int i = 0; i < nVertices; i++) {

x[i] = random.nextInt(width);

y[i] = random.nextInt(height);

vx[i] = 1 + random.nextInt(maxSpeed - 1);

if (random.nextDouble() > 0.5)

vx[i] *= -1;

vy[i] = 1 + random.nextInt(maxSpeed - 1);

if (random.nextDouble() > 0.5)

vy[i] *= -1;

}

setShape(new MovingPolygon(x, y, vx, vy, nVertices));

Color color = new Color(random.nextInt(255), random.nextInt(255),

random.nextInt(255));

getShape().setColor(color);

}

public void draw(Graphics g) {

super.draw(g);

MovingPolygon movingPoly = (MovingPolygon) getShape();

movingPoly.move(0, getWidth(), 0, getHeight());

}

public static void main(String[] args) {

MovingPolygonApp goo = new MovingPolygonApp(500, 500, false, 10);

goo.init(100);

goo.smooth();

goo.go();

}

}