//
//  toy.java
//
//  playing with graphics
//
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.lang.*;

public class mickey extends Frame
{

	my_canvas left,right ;
	my_canvas lower_left,lower_right ;
	public mickey()
	{
	// already have a Frame
	// it is called this

	minnie mymouse = new minnie(this);
//	Canvas can = new Canvas();
//	my_canvas can = new my_canvas(mymouse);
		left  = new my_canvas(mymouse, 200, 200);
		right = new my_canvas(mymouse, 200, 200);
		lower_left  = new my_canvas(mymouse, 200, 200);
		lower_right = new my_canvas(mymouse, 200, 200);
	setSize( 500,500);
	setLayout( new GridLayout(2,2));
	add(left);
	add(right);
	add(lower_left);
	add(lower_right);
	show();
	addMouseMotionListener( mymouse);
	for(;;); // forever


	}

	public void repaint()
	{
		left.repaint();
		right.repaint();
		lower_left.repaint();
		lower_right.repaint();
	}




// the invokation toy.main(S)
// would call this

public static void main( String[] ignored)
{
	Toolkit.getDefaultToolkit().beep();

	mickey t = new mickey();
}// end of main


}// end of class toy


class minnie extends MouseMotionAdapter
{
	Frame my_frame = null;
	int x,y;
	public minnie( Frame f)
	{  my_frame = f;}
		
	public void mouseDragged(MouseEvent e)
	{System.out.println("Mouse Drag to "+e.getX() +" "+ e.getY());}
	public void mouseMoved(MouseEvent e)
	{ x = e.getX() + e.getComponent().getX(); 
	  y = e.getY() + e.getComponent().getY();
		if( my_frame == null)
			e.getComponent().repaint();
		else
			my_frame.repaint();
	System.out.println("Mouse Move to "+e.getX()+" "+ e.getY());
	}
	public int getX()
	{return x;}
	public int getY()
	{ return y;}
}


class my_canvas extends Canvas
{
	private int cx,cy; // the center of the window
	private int height,width; // the width and height of the window
	private int oldx, oldy; // the origin of the old oval
	private int ovx, ovy;  // width and height of the oval
	private minnie mouse;
	my_canvas( minnie m)
        {       addMouseMotionListener( m );

		mouse = m;
		cx = 250;
		cy = 250;
		height = cx+cx;
		width = cy+cy;
		ovx = cx/2;
		ovy = cy/2;
			oldx = -cx -cx;
	}
	my_canvas( minnie m, int width, int height)
	{
	    addMouseMotionListener( m );
			mouse = m;
			cx = width/2;
			cy = height/2;
			oldx = -cx -cx;
			this.height = height;
			this.width = width;
			ovx = cx;
			ovy = cy;
			oldx = -cx -cx;
	}
	
	public void paint( Graphics g)
	{
			g.setColor( Color.black);
			g.drawOval(  cx -ovx/2,cy -ovy/2 , ovx,ovy);
			if( oldx > -cx)
			{
				g.setColor( Color.white);
				//g.fillOval( );
				g.fillOval( oldx,oldy, ovx>>1,ovy>>1);
				g.setColor( Color.black);
			}
//
// get the origin of the screen
//
		int x,y;
		double dx,dy;
		double ddx,ddy;
		dx = mouse.getX() - cx -getX() ;
		dy = mouse.getY() - cy -getY() ;

		double r;
		r = (double)(dx*dx+dy*dy);
		if( r  > 1.e-7)  r = Math.sqrt(1./r);

// dx,dy is the direction vector
		dx *= r;
		dy *= r;

//ddx ddy is the track of the ccenter
		ddx  = dx*ovx/4 + cx;
		ddy  = dy*ovy/4 + cy;
// the center at ddx,ddy has a corner at 		
		ddx -= ovx/4;
		ddy -= ovy/4;

		x = (int)ddx;
		y = (int)ddy;
//
// save these so we can erase
		oldx = x; oldy = y;

		System.out.println(" in drawing routine "+x+" "+ y
		+ " " + getX() + " " + getY());
		g.fillOval( x,y,ovx/2,ovy>>1);
		g.drawOval(cx,cy,2,2);		
	}
}