SO23571375-Ball.java

package com.shreesoft.so;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;

public class Ball {

    int x = 0;
    int xs = -1;
    int ys = -1;
    int y = 0;

    static final int DIAMETER = 30;
    JalPan jpn;

    Ball(JalPan jpn) {
        this.jpn = jpn;
    }

    public void move() {

        if (x + xs < 0) {
            xs = 1;
        } else if (y + ys < 0) {
            ys = 1;
        } else if (x + xs > jpn.getWidth() - 30) {
            xs = -1;
        } else if (y + ys > jpn.getHeight() - 30) {
            ys = -1;
        }
        x = x + xs;
        y = y + ys;
        if (collision()) {
            ys = -1;
            y = jpn.plate.getTop() - DIAMETER;
        }
        if (y + ys > 490) {
            ((JalPan) jpn).gameOver();
        }

    }

    public void paint(Graphics g) {
        g.setColor(Color.RED);
        g.fillRoundRect(x, y, DIAMETER, DIAMETER, DIAMETER, DIAMETER);
    }

    public Rectangle getBounds() {
        return new Rectangle(x, y, DIAMETER, DIAMETER);
    }

    public boolean collision() {
        return jpn.plate.getBounds().intersects(getBounds());
    }
}