// The "MoveAPieceDemo" class.

import java.awt.*;

import java.awt.event.*;

import javax.swing.BoxLayout;

import javax.swing.JButton;

import javax.swing.JCheckBox;

import javax.swing.JComponent;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.event.MouseInputAdapter;

public class MoveAPieceFrameDemo implements ActionListener, ItemListener, MouseListener, MouseMotionListener

{

JFrame frame;

MyPanelClass drawPanel, infoPanel, statusPanel;

MyPanelClass myPanel;

Piece [] myPieces;

int noOfPieces;

JButton clearPieces;

JCheckBox red, green, blue;

Color currentColour;

JCheckBox includeLabel;

JLabel statusMessage;

int selectedPiece;

Point lastPoint;

public MoveAPieceFrameDemo ()

{

frame = new JFrame ("Moving a piece");

myPanel = new MyPanelClass();

frame.setPreferredSize(new Dimension(500, 400));

frame.setLocation (100, 100);

myPanel.setLayout (new BorderLayout ());

infoPanel = new MyPanelClass ();

drawPanel = new MyPanelClass ();

red = new JCheckBox ("red", true);

currentColour = Color.red;

green = new JCheckBox ("green", false);

blue = new JCheckBox ("blue", false);

red.addItemListener (this);

green.addItemListener (this);

blue.addItemListener (this);

includeLabel = new JCheckBox ("Include Label", true);

includeLabel.addItemListener(this);

infoPanel.add (new JLabel ("Colour of Piece"));

infoPanel.add (red);

infoPanel.add (green);

infoPanel.add (blue);

infoPanel.add (includeLabel);

myPanel.add ("North", infoPanel);

myPanel.add ("Center", drawPanel);

// Create a status panel with a message area and clear button

statusPanel = new MyPanelClass ();

clearPieces = new JButton ("Clear Pieces");

clearPieces.setActionCommand("Clear");

clearPieces.addActionListener(this);

statusPanel.add (clearPieces);

statusMessage = new JLabel ("Welcome to the Move a Piece Demo");

statusPanel.add (statusMessage);

myPanel.add ("South", statusPanel);

selectedPiece = -1;

noOfPieces = 0;

myPieces = new Piece [200];

myPanel.addMouseListener(this);

myPanel.addMouseMotionListener (this);

frame.add(myPanel);

frame.pack();

frame.setVisible(true);

} // MoveAPieceFrameDemo constructor

public void mouseClicked (MouseEvent e)

{

System.out.println ("CLICKED: " + e.getX() + " - " + e.getY());

}

public void mouseReleased (MouseEvent e)

{

if (selectedPiece >= 0)

{

selectedPiece = -1;

showStatus ("Piece Dropped");

}

}

public void mouseEntered(MouseEvent e) {

}

public void mouseExited(MouseEvent e) {

}

public void mousePressed(MouseEvent e) {

//System.out.println ("infoPanel: " + infoPanel.getHeight());

Point selectedPoint = new Point (e.getX (), e.getY () - infoPanel.getHeight ()); // must minus the height of the panel above

System.out.println (e.getX () + " - " + e.getY ());

// Check if we are selecting one of the pieces

for (int i = 0 ; i < noOfPieces ; i++)

if (myPieces [i].contains (selectedPoint))

{

selectedPiece = i;

lastPoint = selectedPoint;

showStatus ("Selected Piece #" + i);

}

// Create a new piece in this spot with the current colour

if ( (noOfPieces < 200) && selectedPiece == -1)

{

myPieces [noOfPieces] = new Piece (selectedPoint, 30, currentColour);

noOfPieces++;

showStatus ("Creating a new Piece");

myPanel.repaint ();

}

}

public void mouseMoved (MouseEvent e) {

// Set the cursor to the hand if we are on that piece

Point currentPoint = new Point (e.getX (), e.getY ()- infoPanel.getHeight ()); // must minus the height of the panel above

for (int i = 0 ; i < noOfPieces ; i++)

if (myPieces [i].contains (currentPoint))

{

myPanel.setCursor (Cursor.getPredefinedCursor (Cursor.HAND_CURSOR));

showStatus ("Piece #" + i);

}

// Otherwise we just use the default cursor

showStatus ("No pieces here...");

myPanel.setCursor (Cursor.getDefaultCursor ());

}

public void mouseDragged (MouseEvent e) {

Point currentPoint = new Point (e.getX (), e.getY () - infoPanel.getHeight ());

if (selectedPiece >= 0)

{

showStatus ("Moving Piece #" + selectedPiece);

myPieces [selectedPiece].move (lastPoint, currentPoint);

lastPoint = currentPoint;

myPanel.repaint ();

}

}

public void actionPerformed (ActionEvent event) {

String eventName = event.getActionCommand();

if (eventName.equals("Clear")) {

noOfPieces = 0;

myPanel.repaint ();

}

}

public void itemStateChanged(ItemEvent event) {

if (event.getSource() == red)

currentColour = Color.red;

else if (event.getSource() == green)

currentColour = Color.green;

else if (event.getSource() == blue)

currentColour = Color.blue;

else if (event.getSource() == includeLabel)

myPanel.repaint ();

}

// Changes the statusMessage

public void showStatus (String message)

{

statusMessage.setText (message);

}

// Make all the panels of this new class, so they can be repainted using paintComponent

public class MyPanelClass extends JPanel {

public void paintComponent(Graphics g)

{

super.paintComponent(g);

if (noOfPieces == 0) {

Color c = myPanel.getBackground();

g.setColor(c);

g.clearRect(0,0,500, 400);

g.fillRect (0,0,500,400);

}

System.out.println ("PAINT " + noOfPieces);

// Draw the pieces

for (int i = 0 ; i < noOfPieces ; i++) {

if (includeLabel.isSelected () == true)

myPieces [i].draw (g, String.valueOf (i));

else

myPieces [i].draw (g);

}

// Draw the selected piece last (on top)

if (selectedPiece >= 0)

if (includeLabel.isSelected () == true)

myPieces [selectedPiece].draw (g, String.valueOf (selectedPiece));

else

myPieces [selectedPiece].draw (g);

}

}

public static void main (String [] args){

new MoveAPieceFrameDemo();

}

}