/*
 * Also see ThreeD.java
 */

/* Created/Modified by Håkan Johansson 2000-02-10 */

import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;
import java.awt.Canvas;
import java.io.*;
import java.net.URL;


public class ThreeDCanvas extends Canvas 
    implements Runnable, MouseListener, MouseMotionListener, ActionListener
{
    Model3D md;
    boolean painted = true;
    float xfac;
    int prevx, prevy;
    float xtheta, ytheta;
    float scalefudge = 1;
    Matrix3D amat = new Matrix3D(), tmat = new Matrix3D();
    String mdname = null;
    String message = null;
    URL docbase;
    Panel btnPanel;
    BtnOrText btn[] = new BtnOrText[4];
    int paintmethod = -1;
    Thread initCalc = null;
    boolean bMayPaint = false;

    public void init() {
	//System.out.println ("canvas::init");
	amat.yrot(20);
	amat.xrot(20);
	if (mdname == null)
	    mdname = "model.obj";
	addMouseListener(this);
	addMouseMotionListener(this);

	for (int i = 0; i < btn.length; i++)
	    btn[i].btn.addActionListener(this);
    }

    public void destroy() {
	//System.out.println ("canvas::destroy");
        removeMouseListener(this);
        removeMouseMotionListener(this);

	for (int i = 0; i < btn.length; i++)
	    btn[i].btn.removeActionListener(this);

	if (md != null)
	    md.killInitCalc = true;
    }

    public void actionPerformed(ActionEvent e) {
	for (int i = 0; i < btn.length; i++)
	    if (e.getSource() == btn[i].btn)
		{
		    paintmethod = i;
		    dopaint ();
		}
    }

    public  void mouseClicked(MouseEvent e) {
    }

    public  void mousePressed(MouseEvent e) {
        prevx = e.getX();
        prevy = e.getY();
        e.consume();
    }

    public  void mouseReleased(MouseEvent e) {
    }

    public  void mouseEntered(MouseEvent e) {
    }

    public  void mouseExited(MouseEvent e) {
    }

    public  void mouseDragged(MouseEvent e) {
        int x = e.getX();
        int y = e.getY();

        tmat.unit();
        float xtheta = (prevy - y) * 360.0f / getSize().width;
        float ytheta = (x - prevx) * 360.0f / getSize().height;
        tmat.xrot(xtheta);
        tmat.yrot(ytheta);
        amat.mult(tmat);
	dopaint();
	prevx = x;
        prevy = y;
        e.consume();
    }

    public  void mouseMoved(MouseEvent e) {
    }

    public void update(Graphics g)
    {
	g.setColor (getForeground());
	paint(g);
    }

    public void paint(Graphics g) {
	if (bMayPaint && md != null && paintmethod >= 0) {
	    md.mat.unit();
	    md.matnorm.unit();
	    md.mat.translate(-(md.xmin + md.xmax) / 2,
			     -(md.ymin + md.ymax) / 2,
			     -(md.zmin + md.zmax) / 2);
	    md.mat.mult(amat);
	    md.matnorm.mult(amat);
	    md.mat.scale(xfac, -xfac, 16 * xfac / getSize().width);
	    md.mat.translate(getSize().width / 2, getSize().height / 2, 8);
	    md.transformed = false;
	    md.transformedhit = false;
	    md.transformedtrinorm = false;
	    md.paint(g,this,paintmethod);
	    setPainted();
	} else if (message != null) {
	    g.drawString("Error in model:", 3, 20);
	    g.drawString(message, 10, 40);
	}
    }

    void dopaint()
    {
        if (painted) {
            painted = false;
            repaint();
        }
    }    

    private synchronized void setPainted() {
	painted = true;
	notifyAll();
    }

    public void run() 
    {
	//System.out.println ("canvas::run");
	InputStream is = null;
	try {
	    btn[0].SetLabelText ("Loading model");
	    Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
	    md = new Model3D ();
	    is = new URL(docbase, mdname).openStream();
	    md.ScanFile (is,btn[0]);
	    md.findBB();
	    md.compress();
	    float xw = md.xmax - md.xmin;
	    float yw = md.ymax - md.ymin;
	    float zw = md.zmax - md.zmin;
	    if (yw > xw)
		xw = yw;
	    if (zw > xw)
		xw = zw;
	    float f1 = getSize().width / xw;
	    float f2 = getSize().height / xw;
	    xfac = 0.7f * (f1 < f2 ? f1 : f2) * scalefudge;

	    bMayPaint = true;

	    if (md.CalcWaitOrKill()) return;

	    btn[0].ShowButton();
	    paintmethod = 0;
	    dopaint ();

	    if (md.CalcWaitOrKill()) return;

	    md.CreateHit(btn[1]);
	    btn[1].ShowButton();	    

	    if (md.CalcWaitOrKill()) return;

	    md.CreateLines(1.5,15,btn[2]);
	    md.compress();
	    btn[2].ShowButton();	    

	    if (md.CalcWaitOrKill()) return;

	    md.CreateTris(btn[3]);
	    btn[3].ShowButton();	    

	    if (md.CalcWaitOrKill()) return;
	} catch(Exception e) {
	    md = null;
	    message = e.toString();
	    e.printStackTrace ();
	}
	try {
	    if (is != null)
		is.close();
	} catch(Exception e) {
	}
	repaint();
	//System.out.println ("canvas::run /");
	initCalc = null;
    }

    public void start() 
    {
	//System.out.println ("canvas::start");
	if (initCalc != null)
	    {
		if (md != null)
		    md.pauseInitCalc = false;
		System.out.println ("notifying ");
		initCalc.interrupt();
	    }
	if (md == null && message == null)
	    {
		if (initCalc == null)
		    {
			initCalc = new Thread(this);
			initCalc.start();
		    }
	    }
    }

    public void stop() 
    {
	if (md != null)
	    md.pauseInitCalc = true;
    }

//    private synchronized void waitPainted() {
//	while (!painted)
//	    wait();
//	painted = false;
//    }
}