import java.awt.Color;

/**
 * A Ball object represents the data model for a single bouncing ball.
 * A ball has a position, size, color, and velocity.
 * As it bounces off walls it simply reverses its x or y velocity.
 * @author Marty Stepp
 * @version CSE 331 Spring 2011, 5/18/2011
 */
public class Ball {
	private int x;      // position
	private int y;
	private int size;   // size
	private int dx;
	private int dy;     // velocity
	private Color color;
	
	/**
	 * Constructs a new Ball with the given properties.
	 */
	public Ball(int x, int y, int size, int dx, int dy, Color color) {
		this.x = x;
		this.y = y;
		this.size = size;
		this.dx = dx;
		this.dy = dy;
		this.color = color;
	}
	
	/**
	 * Signifies that this ball has bounced off the left or right wall,
	 * which will cause it to reverse its x velocity.
	 */
	public void bounceLeftRight() {
		dx = -dx;
	}
	
	/**
	 * Signifies that this ball has bounced off the top or bottom wall,
	 * which will cause it to reverse its y velocity.
	 */
	public void bounceTopBottom() {
		dy = -dy;
	}
	
	/**
	 * Moves this ball by the amounts specified as its x and y velocity.
	 */
	public void move() {
		x += dx;
		y += dy;
	}
	
	/**
	 * Returns this ball's color.
	 */
	public Color getColor() {
		return color;
	}
	
	/**
	 * Returns this ball's leftmost x-coordinate.
	 */
	public int getX() {
		return x;
	}
	
	/**
	 * Returns this ball's rightmost x-coordinate.
	 */
	public int getRightX() {
		return x + size;
	}
	
	/**
	 * Returns this ball's topmost y-coordinate.
	 */
	public int getY() {
		return y;
	}
	
	/**
	 * Returns this ball's bottommost y-coordinate.
	 */
	public int getBottomY() {
		return y + size;
	}
	
	/**
	 * Returns this ball's width/height size.
	 */
	public int getSize() {
		return size;
	}
	
	/**
	 * Returns this ball's velocity in the x-axis.
	 * Every time the ball moves, it will shift its x-coordinate by this many pixels.
	 */
	public int getDX() {
		return dx;
	}
	
	/**
	 * Returns this ball's velocity in the y-axis.
	 * Every time the ball moves, it will shift its y-coordinate by this many pixels.
	 */
	public int getDY() {
		return dy;
	}
}