import javax.swing.*;
import java.awt.*;

/**
 * Ball.java
 *
 * A class representing a single circular ball for use
 * in simple 2D animations.  See World.java.
 * 
 * @author Jeff Ondich
 *
 * @version 1.0.0
 * date:    02.09.2010
 */

public class Ball
{
    private int centerX;
    private int centerY;
    private int radius;
    private int velocityX;
    private int velocityY;
    private Color color;

    public Ball(int x, int y, int r, int vx, int vy, Color c)
    {
        centerX = x;
        centerY = y;
        radius = r;
        velocityX = vx;
        velocityY = vy;
        color = c;
    }

    // Draw the Ball object in the Graphics object g.
    public void draw(Graphics g)
    {
        g.setColor(color);
        g.fillOval(centerX - radius, centerY - radius, 2*radius, 2*radius);
    }

    // Move the Ball object one step in the direction and magnitude of
    // its velocity.
    public void step()
    {
        centerX += velocityX;
        centerY += velocityY;
    }


    // ======= Accessors =======

    public int getX()
    {
        return centerX;
    }

    public int getY()
    {
        return centerY;
    }

    public void setCenter(int x, int y)
    {
        centerX = x;
        centerY = y;
    }

    public int getRadius()
    {
        return radius;
    }

    public void setRadius(int r)
    {
        if( r > 0 )
            radius = r;
    }

    public int getVelocityX()
    {
        return velocityX;
    }

    public int getVelocityY()
    {
        return velocityY;
    }

    public void setVelocity(int vx, int vy)
    {
        velocityX = vx;
        velocityY = vy;
    }

    public Color getColor()
    {
        return color;
    }

    public void setColor(Color newColor)
    {
        color = newColor;
    }
}