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

public class Ball
{
    public int x, y, r, maxx, maxy;

    //public static needed to be referenced in context
    public static int dx = 1, dy = 1;

    public Color c;

    public Ball(int X, int Y, int R, Color C)
    {
        x = X;
        y = Y;
        r = R;
        c = C;
    }

    public void draw(Graphics g)
    {
        g.setColor(c);
        g.fillOval(x-r, y-r, 2*r, 2*r);
    }

    public void move()
    {
        x = x + dx;
        y = y + dy;

        if(x > maxx)
            dx=-dx;

        if(x <= 0)
            dx=-dx;

        if(y > maxy)
            dy=-dy;

        if(y <= 0)
            dy=-dy;
    }
}