package T3dawt;
import java.awt.*;
import T3dobject.T3DObject;
import java.awt.event.*;
import java.util.*;

public class T3dCanvas extends Canvas implements
  MouseMotionListener, MouseListener, Runnable {
  Image off;
  Graphics off_g;
  int mouse_x, mouse_y;
  Vector ob;
  T3ddraw draw;
  byte lock[] = new byte[0];
  volatile MouseEvent mouse_e;
  volatile Thread th;

  public T3dCanvas(Vector ob) {
    setBackground(Color.white);
    addMouseMotionListener(this);
    addMouseListener(this);
    this.ob = ob;
    draw = new T3ddraw(ob);
    th = new Thread(this);
    th.start();
  }

  public void createOff() {
    off = createImage(getSize().width, getSize().height);
    off_g = off.getGraphics();
  }

  public void createOff(Image img) {
    off = img;
    off_g = off.getGraphics();
  }

  private void rotation(int x, int y) {
    double ra;
    double step_ra = Math.PI / 18;

    if (y == 0) {
      ra = Math.PI / 2;
      if (x <= 0)
        step_ra = -step_ra;
    } else {
      ra = -Math.atan((double)x / y);
      if (y >= 0)
        step_ra = -step_ra;
    }
    //System.out.println(ra*180/Math.PI);
    for (int i = 0; i < ob.size(); i++)
      ((T3DObject)ob.elementAt(i)).rotation(ra, step_ra);
  }

  public void paint_off() {
    if (off_g != null) {
      draw.sort();
      off_g.setColor(Color.white);
      off_g.fillRect(0, 0, getSize().width, getSize().height);

      //for (int i = 0; i < ob.size(); i++)
      //((T3DObject)ob.elementAt(i)).paint(off_g);
      draw.paint(off_g, getSize().width / 2, getSize().height / 2);

    }
  }

  public void paint(Graphics g) {
    if (off_g != null) {
      g.drawImage(off, 0, 0, this);
    }
  }

  public void update(Graphics g) {
    paint(g);
  }

  /****** mouse ******/
  public void mouseClicked (MouseEvent e) {
    mouse_x = e.getX();
    mouse_y = e.getY();
  }
  public void mouseEntered (MouseEvent e) {}
  public void mouseExited (MouseEvent e) {}
  public void mousePressed (MouseEvent e) {}
  public void mouseReleased (MouseEvent e) {}

  public void mouseDragged(MouseEvent e) {
    synchronized (lock) {
      mouse_e = e;
      lock.notify();
    }
  }
  public void mouseMoved (MouseEvent e) {}

  public void run() {
    Thread thisth = Thread.currentThread();
    MouseEvent e;
    while (th == thisth) {
      synchronized (lock) {
        while (mouse_e == null) {
          try {
            lock.wait();
          } catch (InterruptedException ie) {}
        }
        e = mouse_e;
        mouse_e = null;
      }
      rotation(e.getX() - mouse_x, e.getY() - mouse_y);
      mouse_x = e.getX();
      mouse_y = e.getY();
      paint_off();
      repaint();
    }
  }
}