/*
 * 1.4 version.
 */

import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import java.util.*;

/* These should not be here for Java 1.4
import Point2D;
import BezierCurve284;
*/

/* 
 * This displays a framed area.  When the user clicks within
 * the area, this program displays a dot and a string indicating
 * the coordinates where the click occurred.
 */

public class Main extends Applet implements ActionListener, AdjustmentListener, ItemListener
{
  FramedArea framedArea;
  Label statusLabel, slicesLabel, tLabel;
  Button clearButton, addButton;
  Scrollbar slicesSlider, tSlider;
  Checkbox cbDelete, cbT;

  boolean bDeletePoints = false;
  boolean bBezierDrawT = false;
  double dT = 0.1;

  public Main() 
  {
    super();
    this.setBackground(Color.lightGray);
  }

  public void init() // Called by browser
  {
    GridBagLayout gbLayout = new GridBagLayout();
    GridBagConstraints gbConstraints = new GridBagConstraints();
    
    setLayout(gbLayout);

    //////////////////////////////////////////////////////////////////

    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.weightx = 1.0;
    gbConstraints.weighty = 0.0;

    Label label0 = new Label(" ");
    gbLayout.setConstraints(label0, gbConstraints);
    add(label0);

    Label label1 = new Label(" ");
    gbLayout.setConstraints(label1, gbConstraints);
    add(label1);

    Label label2 = new Label(" ");
    gbLayout.setConstraints(label2, gbConstraints);
    add(label2);

    Label label3 = new Label(" ");
    gbLayout.setConstraints(label3, gbConstraints);
    add(label3);

    Label label4 = new Label(" ");
    gbLayout.setConstraints(label4, gbConstraints);
    add(label4);

    Label label5 = new Label(" ");
    gbLayout.setConstraints(label5, gbConstraints);
    add(label5);

    Label label6 = new Label(" ");
    gbLayout.setConstraints(label6, gbConstraints);
    add(label6);

    Label label7 = new Label(" ");
    gbLayout.setConstraints(label7, gbConstraints);
    add(label7);

    Label label8 = new Label(" ");
    gbLayout.setConstraints(label8, gbConstraints);
    add(label8);

    Label label9 = new Label(" ");
    gbLayout.setConstraints(label9, gbConstraints);
    add(label9);

    gbConstraints.gridwidth = GridBagConstraints.REMAINDER; //end row

    Label labelEnd = new Label(" ");
    gbLayout.setConstraints(labelEnd, gbConstraints);
    add(labelEnd);

    //////////////////////////////////////////////////////////////////

    statusLabel = new Label("Click within the framed area.");
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridwidth = 9;
    gbLayout.setConstraints(statusLabel, gbConstraints);
    add(statusLabel);

    gbConstraints.gridwidth = 1;

    clearButton = new Button( "clear" );
    clearButton.addActionListener(this);
    gbConstraints.gridwidth = GridBagConstraints.REMAINDER; //end row
    gbLayout.setConstraints(clearButton, gbConstraints);
    add(clearButton);

    framedArea = new FramedArea(this);
    gbConstraints.fill = GridBagConstraints.BOTH;
    gbConstraints.weighty = 1.0;
    gbConstraints.gridwidth = GridBagConstraints.REMAINDER; //end row
    gbLayout.setConstraints(framedArea, gbConstraints);
    add(framedArea);

    addButton = new Button( "start new curve" );  
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;  
    gbConstraints.gridwidth = 3;
    gbConstraints.weighty = 0.0;
    addButton.addActionListener(this);
    gbLayout.setConstraints(addButton, gbConstraints);
    add(addButton);

    Label blank1 = new Label(" ");
    gbConstraints.gridwidth = 5;
    gbLayout.setConstraints(blank1, gbConstraints);
    add(blank1);

    cbDelete = new Checkbox("delete selected points");
    gbConstraints.gridwidth = GridBagConstraints.REMAINDER; //end row
    cbDelete.addItemListener(this);
    gbLayout.setConstraints(cbDelete, gbConstraints);
    add(cbDelete);

    Label blank2 = new Label(" ");
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridwidth = 1;
    gbConstraints.weighty = 0.0;
    gbLayout.setConstraints(blank2, gbConstraints);
    add(blank2);

    slicesLabel = new Label(" Slices: 10");
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridwidth = 1;
    gbConstraints.weighty = 0.0;
    gbLayout.setConstraints(slicesLabel, gbConstraints);
    add(slicesLabel);

    slicesSlider = new Scrollbar(Scrollbar.HORIZONTAL, 10, 10, 1, 110);
    slicesSlider.addAdjustmentListener(this);
    gbConstraints.gridwidth = GridBagConstraints.REMAINDER; //end row
    gbLayout.setConstraints(slicesSlider, gbConstraints);
    add(slicesSlider);

    cbT = new Checkbox("");
    gbConstraints.gridwidth = 1;
    cbT.addItemListener(this);
    gbLayout.setConstraints(cbT, gbConstraints);
    add(cbT);

    tLabel = new Label(" t value: 0.1");
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridwidth = 1;
    gbLayout.setConstraints(tLabel, gbConstraints);
    add(tLabel);

    tSlider = new Scrollbar(Scrollbar.HORIZONTAL, 10, 10, 0, 110);
    tSlider.addAdjustmentListener(this);
    gbConstraints.gridwidth = GridBagConstraints.REMAINDER; //end row
    gbLayout.setConstraints(tSlider, gbConstraints);
    add(tSlider);
  }

  public void adjustmentValueChanged(AdjustmentEvent ae)
  {
    if(ae.getSource() == slicesSlider) 
      {
	framedArea.setBezierSlices(slicesSlider.getValue());
	updateSlicesLabel(slicesSlider.getValue());
      }
    else if(ae.getSource() == tSlider) 
      {
	dT = tSlider.getValue()/100.0;
	framedArea.setBezierTValue(dT);
	updatetLabel(dT);
      }
  }

  public void actionPerformed(ActionEvent ae)
  {
    if(ae.getSource() == clearButton) 
      {
	framedArea.clearSelectedArea();
      }
    else if(ae.getSource() == addButton) 
      {
	framedArea.addCurveToSelectedArea();
      }
  }

  public void itemStateChanged(ItemEvent ie)
  {
    if(ie.getSource() == cbDelete)
      {
	if( ie.getStateChange() == ItemEvent.SELECTED )
	  {
	    bDeletePoints = true;
	  }
	else
	  {
	    bDeletePoints = false;
	  }
      }
    else if(ie.getSource() == cbT)
      {
	if( ie.getStateChange() == ItemEvent.SELECTED )
	  {
	    bBezierDrawT = true;
	    framedArea.setBezierDrawT(true);
	  }
	else
	  {
	    bBezierDrawT = false;
	    framedArea.setBezierDrawT(false);
	  }
      }
  }

  public void updateStatusLabel(int xx, int yy) 
  {
    int x = xx + 3;
    int y = yy + 3;
    statusLabel.setText("Control point added at (" + x + ", " + y + ")");
  }

  public void updateSlicesLabel(int slices) 
  {
    slicesLabel.setText(" Slices: " + slices);
  }

  public void updatetLabel(double t) 
  {
    tLabel.setText(" t value: " + t);
  }

  public static void main (String[] args) 
  {
    Main m = new Main();
    m.init();

    final Frame f = new Frame("Bezier Curve");
    f.add(m);
    f.setSize(600,600);
    f.show();
  }
}

//////////////////////////////////////////////////////////////////////////////////
// This class exists solely to put a frame around the coordinate area.

class FramedArea extends Panel 
{
  SelectionArea sArea = null;

  public FramedArea(Main controller) 
  {
    super();
    setLayout(new GridLayout(1,0)); //Set layout so its contents are as big as possible.
    
    sArea = new SelectionArea(controller);
    add(sArea);
  }
  
  public void clearSelectedArea()
  {
    sArea.clearAll();
  }

  public void addCurveToSelectedArea()
  {
    sArea.addCurve();
  }

  public void setBezierSlices(int slices)
  {
    sArea.setBezierSlices(slices);
  }

  public void setBezierTValue(double t)
  {
    sArea.setBezierTValue(t);
  }

  public void setBezierDrawT(boolean b)
  {
    sArea.setBezierDrawT(b);
  }

  public Insets getInsets() 
  {
    return new Insets(4,4,5,5);
  }

  public void paint(Graphics g) 
  {
    Dimension d = getSize();
    Color bg = getBackground();
    
    g.setColor(bg);
    g.draw3DRect(0, 0, d.width - 1, d.height - 1, true);
    g.draw3DRect(3, 3, d.width - 7, d.height - 7, false);
  }
}

//////////////////////////////////////////////////////////////////////////////////
class SelectionArea extends Canvas 
{
  Main controller;
  Vector m_vBezierCurves = new Vector();
  BezierCurve284 m_bcCurveSelected = null;
  BezierCurve284 m_bcCurveCurrent = null;
  
  public SelectionArea(Main controller) 
  {
    super();
    this.controller = controller;
    
    MyListener myListener = new MyListener();
    addMouseListener(myListener);
    addMouseMotionListener(myListener);
  }
  
  class MyListener extends MouseAdapter implements MouseMotionListener 
  {
    public void mousePressed(MouseEvent e) 
    {
      /*
      System.out.println( "Button Pressed: " + e.getModifiers() );
      System.out.println( "   : " + MouseEvent.BUTTON1_MASK + " "
			  + MouseEvent.BUTTON2_MASK + " "
			  + MouseEvent.BUTTON3_MASK );
			  */

      if( (e.getModifiers() == MouseEvent.BUTTON1_MASK) ||  // Java 1.2 Button 1
	  (e.getModifiers() == 0) )                         // Java 1.1
	{
	  BezierCurve284 bcCurve;
	  int x = e.getX();
	  int y = e.getY();
	  
	  m_bcCurveSelected = null;
	  for (Enumeration enum = m_vBezierCurves.elements(); 
	       enum.hasMoreElements(); ) 
	    {
	      bcCurve = (BezierCurve284)enum.nextElement();
	      if( bcCurve.selectedControlPoint(x, y) ) // Select point
		{
		  m_bcCurveSelected = bcCurve;
		}
	    }

	  if( m_bcCurveSelected == null ) // Clicked in empty space
	    {
	      // Add new Point
	      controller.updateStatusLabel(x, y);
	      Point2D pt = new Point2D(x, y);
	     
	      if( m_bcCurveCurrent == null )
		{
		  m_bcCurveCurrent = new BezierCurve284(controller.bBezierDrawT, 
						       controller.dT);
		  m_vBezierCurves.addElement(m_bcCurveCurrent);
		}

	      m_bcCurveSelected = m_bcCurveCurrent;
	      m_bcCurveCurrent.addPoint(pt);
	      //m_bcCurveCurrent.display();

	      repaint();
	    }
	  else // Clicked on point
	    {
	      if( controller.bDeletePoints ) // delete selected point
		{
		  m_bcCurveSelected.deleteSelectedControlPoint();
		  controller.statusLabel.setText("Control point deleted at (" +x+ ", " +y+ ")");
		  repaint();
		}
	    }
	}
      else if( e.getModifiers() == MouseEvent.BUTTON2_MASK ) // Button 2
	{
	}
      else if( e.getModifiers() == MouseEvent.BUTTON3_MASK ) // Button 3
	{
	}
      else
	{
	  System.out.println( "Button Press Error");
	}
    }
    
    public void mouseDragged(MouseEvent e) 
    {
      if( m_bcCurveSelected != null )
	{
	  int x = e.getX();
	  int y = e.getY();
	  
	  m_bcCurveSelected.moveSelectedControlPoint( x, y );
	  controller.statusLabel.setText("Control point moved to (" +x+ ", " +y+ ")");
	  repaint();
	}
    }
    
    public void mouseMoved(MouseEvent e) 
    {
    }

    public void mouseReleased(MouseEvent e) 
    {
      if( m_bcCurveSelected != null )
	{
	  m_bcCurveSelected.deselectControlPoint();
	}
    }
  }

  public void clearAll()
  {
    m_bcCurveSelected = null;
    m_bcCurveCurrent = null;

    m_vBezierCurves.removeAllElements();

    repaint();
  }

  public void addCurve()
  {
    if( m_vBezierCurves != null)
      {
	m_bcCurveCurrent = new BezierCurve284(controller.bBezierDrawT, 
					     controller.dT);
	m_vBezierCurves.addElement(m_bcCurveCurrent);

	m_bcCurveSelected = null;
      }
  }

  public void setBezierSlices(int slices)
  {
    BezierCurve284 bcCurve;

    for (Enumeration enum = m_vBezierCurves.elements(); 
	 enum.hasMoreElements(); ) 
      {
	bcCurve = (BezierCurve284)enum.nextElement();
	bcCurve.setSlices(slices);
      }

    repaint();
  }

  public void setBezierTValue(double t)
  {
    BezierCurve284 bcCurve;

    for (Enumeration enum = m_vBezierCurves.elements(); 
	 enum.hasMoreElements(); ) 
      {
	bcCurve = (BezierCurve284)enum.nextElement();
	bcCurve.setTValue(t);
      }

    repaint();
  }

  public void setBezierDrawT(boolean b)
  {
    BezierCurve284 bcCurve;

    for (Enumeration enum = m_vBezierCurves.elements(); 
	 enum.hasMoreElements(); ) 
      {
	bcCurve = (BezierCurve284)enum.nextElement();
	bcCurve.setDrawT(b);
      }

    repaint();
  }

  public void paint(Graphics g) 
  {
    BezierCurve284 bcCurve;

    for (Enumeration enum = m_vBezierCurves.elements(); 
	 enum.hasMoreElements(); ) 
      {
	bcCurve = (BezierCurve284)enum.nextElement();
	bcCurve.paint(g);
      }
  }
}