/* JitterbugViewer.java

   History:

   08 Jul 08  Update to reflect changes to JitterbugController.
   28 Feb 07  Replace deprecated show() with setVisible().  Use nested classes
              rather than implementing MouseListener and MouseMotionListener
              interfaces.
   05 Aug 06  Add an "Animate" button.  Don't bother with MIN_STAGE_INDEX or
              singleStep() function (it was only called in one place).
   03 Aug 06  Convert GUI to Swing.  Decrease initial size from 700x700
              to 600x600.  Handle selection of "Animate" option using
              ActionListener rather than ItemListener since Swing, which
              is right since it doesn't represent a change in the JComboBox
              state, doesn't report reselection of the Animate option
	      to ItemListeners whereas AWT does for the Choice device.
	      Rename ANIMATE_OPTION_LABEL, STEP_OPTION_LABEL and
              MIN_STAGE_OPTION to ANIMATE_LABEL, STEP_LABEL and
	      MIN_STAGE_INDEX.  Add new labels ANIMATE_INDEX and STEP_INDEX.
              Remove weird event handling logic necessary when programmatic
              device changes are reported as if they were user changes.
   29 May 06  Substitute drag-driven rotation for clunky scrollbar-driven
              rotation.  Eliminate help window.
   31 Oct 05  Remove semi-useless magnify facility, move rotate bar
              south and make y axis default rotation axis.
              Make axis codes coincide with choice values.
   17 Oct 05  Remove M_ prefix from all constants.
              Encapsulate more stage information in JitterbugController
              rather than have JitterbugViewer deal with it.
   14 Oct 05  JitterbugPicture renamed to JitterbugController.
   13 Oct 05  Rename m_X constant X_AXIS.  Similarly for m_Y and m_Z.
              Replace deprecated resize() call with setSize().
              Replace deprecated event handlers with listeners of
              various sorts.  Step Button now indirectly steps by
              setting choice value to "Step" which is now the only
              place where singleStep() is called.  For default case,
              singleStep() now checks that the selection isn't already
              "Step" when setting the choice value to "Step".
              These last two changes are to handle a situation
              where programmatically set choices now activate the
              appropriate listeners.  This only happens with the Blackdown
              Linux Java implementation, so I think it's a bug, but
              I'll cover myself anyway.
   16 Sep 05  Add simple help window and i18n (de, en, es, fr).
   15 Sep 05  Add JitterbugViewer.main() so this file can supercede
              JitterbugViewerPgm.java as well as serve as an applet.
              Rename this file from JitterbugViewerApplet.java to
              JitterbugViewer.java.  Don't declare m_X, m_Y and m_Z
              as public ("@see m_axis" was messing up javadoc).
   24 Mar 99  Added javadoc comments.  Changed name of m_dim to m_axis.
              Centered rotate Scrollbar on 0.
   02 Mar 99  Allow acceleration of animation.
   01 Mar 99  Allow animation to be stopped and different stages viewed.
   23 Feb 99  Created.
*/

import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.event.*;

/**
  GUI for viewing jitterbug animation.

  @author Bob Burkhardt
*/
public class JitterbugViewer extends JApplet
  implements ActionListener, ItemListener {
  JitterbugController m_controller;
  JComboBox m_select_stage;
  JButton m_single_step, m_animate;
  ResourceBundle m_vocabulary;

  /**
    Initial dimension of viewing square for stand-alone app.
    */
  static final int INITIAL_DIM = 600;
  /**
    Indicate whether left-mouse-button drag is in progress.  MOUSE_PRESSED
    indicates drag in progress; otherwise, MOUSE_RELEASED.
    */
  int m_drag = MouseEvent.MOUSE_RELEASED;

  public void init() {
    m_vocabulary = ResourceBundle.getBundle("Vocabulary");
    getContentPane().setLayout(new BorderLayout());
    JPanel p = new JPanel();
    p.setLayout(new FlowLayout());
    m_animate = new JButton(m_vocabulary.getString(ANIMATE_LABEL));
    m_animate.addActionListener(this);
    p.add(m_animate);
    m_select_stage = new JComboBox();
    m_select_stage.addItem(m_vocabulary.getString(ANIMATE_LABEL));
    m_select_stage.addItem(m_vocabulary.getString(STEP_LABEL));
    for (int i = JitterbugModel.DEFAULT_STAGE + 1;
         i <= JitterbugModel.MAX_STAGE; i++) {
      String label = JitterbugModel.getStageLabel(i);
      m_select_stage.addItem(m_vocabulary.getString(label));
    }
    m_select_stage.addItemListener(this);
    m_select_stage.addActionListener(this);
    p.add(m_select_stage);
    m_single_step = new JButton(m_vocabulary.getString(STEP_LABEL));
    m_single_step.addActionListener(this);
    p.add(m_single_step);
    getContentPane().add("North", p);
    m_controller = new JitterbugController();
    m_controller.addMouseListener(m_mouseListener);
    m_controller.addMouseMotionListener(m_mouseMotionListener);
    getContentPane().add("Center", m_controller);
    m_controller.resetRotation();
  }

  public static void main(String[] args)
  {
    JFrame f = new JFrame("Jitterbug");
    JitterbugViewer jitterbug = new JitterbugViewer();
    jitterbug.init();
    f.getContentPane().add(jitterbug);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setSize(INITIAL_DIM, INITIAL_DIM);
    f.setVisible(true);
  }

  /**
    Handle JComboBox stage selections (Animate and Step handled elsewhere).
    */
  public void itemStateChanged(ItemEvent evt) {
    if (evt.getSource() == m_select_stage) {
      int choice = m_select_stage.getSelectedIndex();
      if (choice > STEP_INDEX) {
        m_controller.suspend();
        m_controller.setStage(JitterbugModel.DEFAULT_STAGE +
			      (choice - STEP_INDEX));
      }
    }
  }

  /**
    Handle JButton events and JComboBox Animate and Step selections.
    */
  public void actionPerformed(ActionEvent evt) {
    if (evt.getSource() == m_select_stage) {
      // Step and Animate selections from JComboBox are handled here
      // so that repeated selections of the same item can be handled
      int choice = m_select_stage.getSelectedIndex();
      if (choice == ANIMATE_INDEX) {
        if (m_controller.isSuspended()) m_controller.resume();
        else m_controller.accelerate();
      }
      else if (choice == STEP_INDEX) {
        m_controller.suspend();
        m_controller.step();
        m_select_stage.setSelectedIndex
          (STEP_INDEX +
	   (m_controller.getStage() - JitterbugModel.DEFAULT_STAGE));
      }
    }
    else if (evt.getSource() == m_single_step) {
      // refer button presses to handler for selections
      m_select_stage.setSelectedIndex(STEP_INDEX);
    }
    else if (evt.getSource() == m_animate) {
      // refer button presses to handler for selections
      m_select_stage.setSelectedIndex(ANIMATE_INDEX);
    }
  }

  /**
   Mouse listener code to start and stop user bug rotations via the
   mouse.
   */
  MouseAdapter m_mouseListener = new MouseAdapter() {
    /**
      Watch for presses of the left mouse button, and update state
      accordingly (part of MouseListener interface).
      */
    public void mousePressed(MouseEvent evt)
    {
      if (evt.getButton() == MouseEvent.BUTTON1)
      {
        m_drag = MouseEvent.MOUSE_PRESSED;
        m_controller.startRotation(evt.getX(), evt.getY());
      }
    }

    /**
      Watch for presses of the left mouse button, and update state
      accordingly (part of MouseListener interface).
      */
    public void mouseReleased(MouseEvent evt)
    {
      if (evt.getButton() == MouseEvent.BUTTON1)
        m_drag = MouseEvent.MOUSE_RELEASED;
    }
  };

  /**
   Mouse motion listener code to carry out user bug rotations via the
   mouse.
   */
  MouseMotionAdapter m_mouseMotionListener = new MouseMotionAdapter() {
    /**
      Watch for mouse movements and adjust rotation accordingly
      (part of MouseMotionListener interface).
      */
    public void mouseDragged(MouseEvent evt)
    {
      if (m_drag == MouseEvent.MOUSE_PRESSED)
        m_controller.updateRotation(evt.getX(), evt.getY());
    }
  };

  /**
    Label for animate option.
    */
  final static String ANIMATE_LABEL = "Animate";
  /**
    JComboBox index for animate option.
    */
  final static int ANIMATE_INDEX = 0;
  /**
    Label for step option.
    */
  final static String STEP_LABEL = "Step";
  /**
    JComboBox index for step option.
    */
  final static int STEP_INDEX = 1;

}
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