//
// Turtle Graphics Library extension for teaching OO concepts
// by Hideki Tsuiki, Kyoto University
// as a modification of Tatsuya Hagino's Turtle Graphics Library
// Copyright (C) 2006, Hideki Tsuiki, Kyoto University
// Copyright (C) 2000, Hideki Tsuiki, Kyoto University

// Turtle Graphics Library for Information Processing I
// Copyright (C) 1998, Tatsuya Hagino, Keio University
//
// Permission to use, copy, modify, and distribute this software
// for educational purpose only is hereby granted, provided that
// the above copyright notice appear in all copies and that both
// the copyright notice and this permission notice appear in
// supporting documentation.  This software is provided "as is"
// with no warranty.


import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.lang.Math;
import java.util.Vector;

/** タートルを表示するウィンドウのクラス。 */

public class TurtleFrame extends JPanel implements ActionListener, ItemListener { 
   JFrame frame;
   JRadioButtonMenuItem[] speedMenu;
   static String[] speedMenuString = {"no turtle", "fast", "normal", "slow"};

   Vector<Line> history  = new Vector<Line>(10);
   Vector<Turtle> turtles = new Vector<Turtle>(10);
   boolean mesh= false;

   /** TurtleFrame を、デフォルトの大きさ(400x400) で作成する。 */
   public TurtleFrame(int width, int height) {
      super();
      setPreferredSize(new Dimension(width, height));
      setBackground(Color.white);
      setForeground(Color.black);

      frame = new JFrame("Turtle");
      JFrame.setDefaultLookAndFeelDecorated(true);

      JMenuBar menubar = new JMenuBar();
      JMenu file = new JMenu("File", true);
      menubar.add(file);
      JMenuItem quit = new JMenuItem("Quit");
      quit.addActionListener(this);
      quit.setActionCommand("quit");
      file.add(quit);

      JMenu speed = new JMenu("Speed", true);
      menubar.add(speed);
      speedMenu = new JRadioButtonMenuItem[speedMenuString.length];
      ButtonGroup bg = new ButtonGroup();
      for (int i = 0; i < speedMenuString.length; i++) {
	 speedMenu[i] = new JRadioButtonMenuItem(speedMenuString[i], false);
	 speedMenu[i].addItemListener(this);
	 speed.add(speedMenu[i]);
	 bg.add(speedMenu[i]);
      }
      speedMenu[Turtle.speedNormal].doClick();
      frame.setJMenuBar(menubar);

      Container c = frame.getContentPane();
      c.add(this);
      frame.pack();
      frame.setDefaultCloseOperation(3);  // EXIT_ON_CLOSE
      frame.setVisible(true);
   }

  /** TurtlePanel を、デフォルトの大きさ(400x400) で作成する。 */
  public TurtleFrame() {
    this(400,400);
  }

  // menu bar event handler
   public void actionPerformed(ActionEvent e) {
      String cmd = e.getActionCommand();
      if (cmd.equals("quit")) System.exit(0);
   }

  // menu event handler
   public void itemStateChanged(ItemEvent e) {
      JRadioButtonMenuItem s = (JRadioButtonMenuItem)e.getItem();
      for (int i = 0; i < speedMenuString.length; i++) {
	 if (s == speedMenu[i]) {
	    if(i > 0) Turtle.speedAll(i);
	    else Turtle.withTurtleAll = false;
	    break;
	 }
      }
   }

   public void paintComponent(Graphics g) {
      super.paintComponent(g);
      if(mesh){
	 drawmesh(g);
      }
      for (int i = 0; i < history.size(); i++) {
	 Line line = history.elementAt(i);
	 g.setColor(line.c);
	 g.drawLine(line.bx, line.by, line.ex, line.ey);
      }
      for (int i = 0; i < turtles.size(); i++) {
	 Turtle t = turtles.elementAt(i);
	 t.show(g);
      }
   }
  

  // class for line segment
  class Line {
    public int bx;
    public int by;
    public int ex;
    public int ey;
    public Color c;
    public Line(int bx, int by, int ex, int ey, Color c) {
      this.bx = bx;
      this.by = by;
      this.ex = ex;
      this.ey = ey;
      this.c = c;
    }
  }


  /** t をこのフレームの上に追加する。 */
  public void add(Turtle t)
  {
    turtles.addElement(t);
    t.setFrame(this);
    repaint();
  }

  /** t をこのフレームから削除する。 */
  public void remove(Turtle t)
  {
    turtles.removeElement(t);
    repaint();
  }

  /** 今までに書かれた全ての線を消す。*/
  public void clear(){
     history.clear();
     repaint();
  }

  void addLineElement(int xx, int yy, int x, int y, Color c)
  {
    history.addElement(new Line(xx,yy,x,y,c));
  }

   static Color meshDark = new Color(230,230,100);
   static Color meshLight = new Color(230,230,230);

   void drawmesh(Graphics g)
      {
    int width = getWidth();
    int height = getHeight();
  
    g.setColor(meshLight);
    for(int x = 0; x < width; x+= 10){
      g.drawLine(x,0,x,height);
    }
    for(int x = 0; x < height; x+= 10){
      g.drawLine(0,x,width,x);
    }
    g.setColor(meshDark);
    for(int x = 0; x < width; x+= 50){
      g.drawLine(x,0,x,height);
    }
    for(int x = 0; x < height; x+= 50){
      g.drawLine(0,x,width,x);
    }
  }
  
  public void addMesh() {
    mesh = true;
    repaint();
  }
}