// Fws3DDrive.java
// Flower Works Animation Applet (Sub Driving Applet)
// Copyright (C) 1997,1998 Yukinori NAGATANI
// nagatani@eken.phys.nagoya-u.ac.jp

import	java.applet.Applet;
import	java.awt.*;
import	java.util.Date;
import	java.net.URL;

import	Fws3D;
//import	StringRoll;

public class Fws3DDrive extends Applet {
	
	int		xSize,	ySize;
	Fws3D		fws;
	int		nFwTime;
	
	double		angleXY;
	
//	StringRoll	RollWelcome;
	
	public void init (int xWin, int yWin) {
		
		xSize = xWin;
		ySize = yWin;
		resize (xWin, yWin);
		
		fws = new Fws3D ();
		nFwTime = 0;
		
		angleXY = 0.0;
		
//		URL	ImageURL = getDocumentBase();
//		Image	imageStrings
//			= getImage (ImageURL, "WelcomeNagatani.gif");
//		RollWelcome
//			= new StringRoll (imageStrings, 50, 0, this);
	}
	
	public void paint (Graphics g) {
		
		g.setColor (getBackground());
		g.fillRect (0, 0, size().width, size().height);
		
//		RollWelcome.paint (g, this);
		
		for (Fw3D fw = fws.first ; fw != null ; fw = fw.next) {
			double	X = +Math.cos (angleXY) * fw.x
				    +Math.sin (angleXY) * fw.y,
				Y = -Math.sin (angleXY) * fw.x
				    +Math.cos (angleXY) * fw.y,
				Z = fw.z;
			
			double	depth = 1000;
			int	x = (int) (0.5*xSize + X * depth/(depth+Y)),
				y = (int) (1.0*ySize - Z * depth/(depth+Y));
			g.setColor (fw.getColor ());
			g.fillRect (x,y, 2,2);
		}
		fws.evolute ();
		if (nFwTime <= 0) {
			double	x = -10 + (int) (20.0*Math.random ()),
				rAngle = Math.PI * (0.35 + 0.3*Math.random ()),
				V  = 8.0 + 9.0*Math.random (),
				xV = V * Math.cos (rAngle),
				yV = 0.0,
				zV = V * Math.sin (rAngle);
			Fw3D	fw = new Fw3D (x, 0.0, 0.0,
					       xV, yV, zV, 0.01, 20, 2);
			fws.add (fw);
			double	R = Math.random ();
			nFwTime = 1 + (int) (50.0*R*R);
		}
		angleXY += 2.0*Math.PI * 5/360;
		nFwTime --;
		
	}
}