import java.awt.*;
import java.util.Random;

public class Ball
{
    double px, py;
    double vx, vy;
    double mass;
    int radius;
    Color color;
    Ball()
    {
	color = new Color(255,0,0);
	px = 50;
	py = 60;
	vx = 8;
	vy = 9;
	set_radius(17);
    }
    Ball(int px, int py, int vx, int vy, Color color)
    {
	this.px = px;
	this.py = py;
	this.vx = vx;
	this.vy = vy;
	this.color = color;
	set_radius(17);
    }
    public void randomize(double v)
    {
	Random r = new Random();
	px = 400*r.nextDouble();
	py = 400*r.nextDouble();
	double theta = r.nextDouble()*2.0*Math.PI;
	vx = v*Math.cos(theta);
	vy = v*Math.sin(theta);
    }
    public void set_radius(int r)
    {
	radius = r;
	mass = r*r;
    }

    public String toString()
    {
	String str = "("+px+", "+py+") " + color;
	return str;
    }
    
    public void move()
    {
	px += vx;
	py += vy;
    }

    public void move(double delta)
    {
	px += vx*delta;
	py += vy*delta;
    }
    
    public void draw(Graphics g) 
    {
	g.setColor(color);
	g.fillOval((int)(px-radius), (int) (py-radius), (int)2*radius, (int)2*radius);
    }

    
}