import test;
import java.awt.*;

/*
 *
 * ball
 *
 */


class ball{
	public final int MAX_VEL   = 14;
	public Graphics g;
	public point    size	= new point(0,0);
	public point    acc		= new point(0,0);
	public point    vel		= new point(0,0);
	public point    pos		= new point(50,50);
	public point    p       = new point(50,50);
	public wall     t_wall  = new wall(0,0,1,1);
	public point    t_p     = new point(0,0);

	ball(Graphics g_in, double posx, double posy, double sizex, double sizey ){
		pos.init(posx,posy);
		size.init(sizex,sizey);
		p.assign(pos);
		g = g_in;
	}

	public void move(){
		g.setColor(Color.white);
		display(p);
		g.setColor(Color.black);
		display(pos);
	}
	public void accel(point mouse){
		p.assign(pos);
		acc.sub(pos,mouse);						// finne distanse til mus
		acc.mult(Math.pow(500/ (pos.square(mouse) + 10),2),acc);
		acc.y += 0.5;							// addere gravitasjon
		vel.add(vel,acc);						// øke hastighet
		if (vel.length() > MAX_VEL)
			vel.set_length(MAX_VEL);			// sette maks fart
		pos.add(pos,vel);						// Ny posisjon
	}
	
	public void display(point A){
	g.drawOval((int) (A.x - size.x / 2 + 2)
		      ,(int) (A.y - size.y / 2 + 2)
			  ,(int) size.x -3
			  ,(int) size.y -3);
	}

	public void bounce(point edge, double radius){
		
		t_wall.A.assign(p);
		t_wall.B.assign(pos);
		t_wall.init();
		t_wall.dist(edge);
		if (t_wall.length < radius){
			double t = Math.sqrt(radius*radius - t_wall.D.y*t_wall.D.y);
			t = t_wall.D.x - (t / t_wall.length);
			t_p.mult(t,t_wall.E);
			t_p.sub(t_wall.A,t_p);			// Punktet hvor radius treffer
			t_p.sub(t_p,edge);
			t_p.init(t_p.y, - t_p.x);	// Parallell med treff-flate
		
			t_wall.A.add(edge,t_p);
			t_wall.B.sub(edge,t_p);
			t_wall.init();
			t_wall.bounce(this, radius);		// Sprett på denne!
	
		}
	}

}