We use Java and Eclipse IDE

If someone could complete all parts that would be great. Also, I only included the classes that need changed, there are too many to post the sntire program. Whatever you answer i can test. Thank you.

Task:

Part I:

Create an implementation of a stack for the following interface:

/**

* A stack of items.

*/

public interface ItemStack {

/**

* Push an item onto the stack

*

* @param item item to be pushed

*/

public void pushItem(E item);

/**

* Pop an item of the stack

*

* @return the popped item

* @throw NoSuchElementException if stack is empty

*/

public E popItem();

/**

* Return the item on the top of the stack without removing it

*

* @return the item on the top of the stack

* @throw NoSuchElementException if stack is empty

*/

public E peekItem();

/**

* Test if the stack is empty

*

* @return true if the stack is empty, otherwise false

*/

public boolean isEmpty();

/**

* Clear the stack, removes all items.

*/

public void clear();

}

Part II:

Write JUnit test program to thoroughly test all of the methods of your ItemStack class. Once you are confident is it working correctly, proceed to part III.

Part III:

The task is to add undo/redo support.

Undo/redo is generally implemented using stacks of objects that have redo and undo methods. These operations can be expressed by the following abstract data type:

/**

* An abstact data type to perform (redo) an edit action together

* with a method effective undo the action.

*

* @author dtsmith

*/

public interface EditAction {

/**

* Perform some edit action

*/

public void redo();

/**

* Undo the effects of the edit action

*/

public void undo();

}

The strategy is to modify methods that change the state of an object to first create an EditAction object with sufficient information to perform the change and to undo the change. These EditAction objects are pushed onto an undo stack. For example take the setX(int x) method. The following is a SetXEditAction can perform the redo and undo actions:

private class SetXEditAction implements EditAction {

int originalX;

int newX;

public SetXEditAction(int originalX, int newX) {

super();

this.originalX = originalX;

this.newX = newX;

}

public void redo() {

PtrDrawObject.this.x = newX;

}

public void undo() {

PtrDrawObject.this.x = originalX;

}

}

The redo will set the x of an object with its new value, the undo will set the x back to its original value. The setX method will now create a SetXEditAction object and then call a method to execute it, which is call the redo method:

public void setX(int x) {

editor.executeEditAction(new SetXEditAction(getX(), x));

}

The executeEditAction will in addition to calling the EditActions redo method, push the EditAction onto an undo stack of EditActions.

An undo method of the editor will pop EditActions from the undo stack, call the undo method on the EditAction, and add the EditAction to the redo stack. A redo method of the editor does the reverse.

Updates in the editor may generate a number of EditActions that are pushed onto the stack. To have these grouped together and processed as one unit, nulls are pushed and popped to delimit each group of EditActions.

The painter program has been updated with some of the undo/redo code. Further steps are needed to complete this task. Follow these steps carefully:

Step 1:

At the end of PtrEditor are five methods with TODO comments. These are executeEditAction, addUndoMarker, addRedoMarker, redo, and undo. Complete the implementation to support undo/redo.

Step 2:

There is a TODO comment in the middle of the open method. Add the indicated code to clear the undo and redo stacks.

Step 3:

In PtrDrawObject there are three TODO comments. Complete the implementation to have setColor, setLineColor, and setLineWidth to have undo redo support. So the same pattern used in the setX methods

Step 4:

Back in PtrEditor there is a TODO comment in the removeDrawObject. Complete the implementation to have removeDrawObject have undo redo support. Use the same pattern found in addDrawObject, however be careful to make sure the undo will put the draw object back in the same position from which it was removed.

Source Codes:

PtrEditor.java:

package edu.www.xxxx310.painter;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Font;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.ItemEvent;

import java.awt.event.ItemListener;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.awt.event.MouseMotionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.util.ArrayList;

import java.util.EventObject;

import java.util.Iterator;

import java.util.List;

import java.util.Stack;

import javax.swing.BorderFactory;

import javax.swing.JButton;

import javax.swing.JColorChooser;

import javax.swing.JComboBox;

import javax.swing.JFileChooser;

import javax.swing.JFrame;

import javax.swing.JInternalFrame;

import javax.swing.JLabel;

import javax.swing.JMenuBar;

import javax.swing.JPanel;

import javax.swing.JPopupMenu;

import javax.swing.JToggleButton;

import javax.swing.JToolBar;

import javax.swing.border.BevelBorder;

import javax.swing.filechooser.FileFilter;

import com.javera.ui.IconManager;

import com.javera.ui.actions.CopyAction;

import com.javera.ui.actions.Copyable;

import com.javera.ui.actions.CutAction;

import com.javera.ui.actions.Cutable;

import com.javera.ui.actions.DeleteAction;

import com.javera.ui.actions.Deleteable;

import com.javera.ui.actions.Exitable;

import com.javera.ui.actions.Groupable;

import com.javera.ui.actions.NewAction;

import com.javera.ui.actions.Newable;

import com.javera.ui.actions.OpenAction;

import com.javera.ui.actions.Openable;

import com.javera.ui.actions.PasteAction;

import com.javera.ui.actions.RedoAction;

import com.javera.ui.actions.Redoable;

import com.javera.ui.actions.SaveAction;

import com.javera.ui.actions.SaveAsable;

import com.javera.ui.actions.Saveable;

import com.javera.ui.actions.UndoAction;

import com.javera.ui.actions.Undoable;

import com.javera.ui.actions.Ungroupable;

import com.javera.ui.layout.JvBoxLayout;

/**

* PtrEditor is the main frame for the painter application.

*

* PtrEditor will processes all mouse and keyboard events and forward them to

* the appropriate paint object depending on the context.

*

* PtrEditor also provides a number of service methods the the paint objects can

* use access and manipulate other objects.

*

* @author

*

*/

public class PtrEditor extends JFrame implements MouseListener,

MouseMotionListener, KeyListener, Undoable, Redoable, Groupable, Ungroupable, Deleteable,

Cutable, Copyable, Openable, Saveable, SaveAsable, Newable, Exitable {

private PtrPanel painterPanel; // Painter panel where paint objects will be

// rendered

private PtrEditActionHandler editActionHandler; // Edit action handler to

// which events will be

// forwarded

private PtrDrawTool defaultTool; // The default toolbar tool

private PtrToolGroup toolGroup; // Group to provide exclusive selection of

// toolbar tools

private ArrayList drawObjects; // The paint objects themselves.

private String fileName;

private Color color = Color.white;

private Color lineColor = Color.black;

private int lineWidth = 1;

private Font font = getFont();

private static PtrEditor editor;

public static PtrEditor getEditor() {

return editor;

}

/**

* Main line - just creates and displays a PtrEditor

*

* @param args

* - not used

*/

static public void main(String[] args) {

new PtrEditor().setVisible(true);

}

/**

* Default constructor

*

* Builds the painter frame

*

*/

public PtrEditor() {

editor = this;

// create an empty list of paint objects

drawObjects = new ArrayList();

// create the menu bar

JMenuBar menuBar = new JMenuBar();

menuBar.add(new PtrFileMenu());

menuBar.add(new PtrEditMenu());

menuBar.add(new PtrOptionsMenu());

menuBar.add(new PtrHelpMenu());

// create the tool bar

JToolBar toolBar = new JToolBar();

toolBar.add(NewAction.getAction());

toolBar.add(OpenAction.getAction());

toolBar.add(SaveAction.getAction());

toolBar.addSeparator();

toolBar.add(CutAction.getAction());

toolBar.add(CopyAction.getAction());

toolBar.add(PasteAction.getAction());

toolBar.addSeparator();

toolBar.add(UndoAction.getAction());

toolBar.add(RedoAction.getAction());

toolBar.addSeparator();

toolGroup = new PtrToolGroup();

toolBar.add(toolGroup.add(defaultTool = new PtrDrawSelectionTool()));

toolBar.add(toolGroup.add(new PtrDrawTextTool()));

toolBar.add(toolGroup.add(new PtrDrawLineTool()));

toolBar.add(toolGroup.add(new PtrDrawBoxTool()));

toolBar.add(toolGroup.add(new PtrDrawOvalTool()));

toolBar.add(toolGroup.add(new PtrDrawImageTool()));

toolBar.addSeparator();

toolBar.add(DeleteAction.getAction());

selectDefaultTool();

JPanel attrBar = new JPanel(new JvBoxLayout(JvBoxLayout.X_AXIS, 0, 0, 0, 0, 0));

attrBar.add(new JLabel("Line color "));

final JButton lineColorButton = new JButton();

lineColorButton.setBackground(lineColor);

lineColorButton.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

applyLineColor();

}});

attrBar.add(lineColorButton);

JButton chooseLineColor = new JButton(IconManager.getIcon( "DownArrow.gif" ));

chooseLineColor.setPreferredSize(new Dimension(20, chooseLineColor.getHeight()));

chooseLineColor.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

Color newColor = JColorChooser.showDialog(PtrEditor.this, "Select Line Color", lineColor);

if (newColor != null) {

lineColor = newColor;

lineColorButton.setBackground(lineColor);

applyLineColor();

}

}});

attrBar.add(chooseLineColor);

attrBar.add(new JLabel(" Line size "));

final JComboBox lineWidthCombo = new JComboBox();

lineWidthCombo.addItem(0);

lineWidthCombo.addItem(1);

lineWidthCombo.addItem(2);

lineWidthCombo.addItem(4);

lineWidthCombo.addItem(8);

lineWidthCombo.addItemListener(new ItemListener() {

public void itemStateChanged(ItemEvent e) {

lineWidth = (Integer) lineWidthCombo.getSelectedItem();

applyLineWidth();

}});

lineWidthCombo.setSelectedItem(lineWidth);

JPanel t = new JPanel(new JvBoxLayout(JvBoxLayout.Y_AXIS, 0, 0, 0, 0, 0));

t.add(lineWidthCombo);

attrBar.add(lineWidthCombo);

attrBar.add(new JLabel(" Background "));

final JButton colorButton = new JButton();

colorButton.setBackground(color);

colorButton.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

applyColor();

}});

attrBar.add(colorButton);

JButton chooseColor = new JButton(IconManager.getIcon( "DownArrow.gif" ));

chooseColor.setPreferredSize(new Dimension(20, colorButton.getHeight()));

chooseColor.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

Color newColor = JColorChooser.showDialog(PtrEditor.this, "Select Background Color", color);

if (newColor != null) {

color = newColor;

colorButton.setBackground(color);

applyColor();

}

}});

attrBar.add(chooseColor);

// create the paint panel where the paint objects will be rendered

painterPanel = new PtrPanel(this);

painterPanel.setBorder(BorderFactory

.createBevelBorder(BevelBorder.LOWERED));

// set all paint panel events to be processed by the editor

painterPanel.setFocusable(true);

painterPanel.addMouseListener(this);

painterPanel.addMouseMotionListener(this);

painterPanel.addKeyListener(this);

// Add the menubar, toolbar and painter panel to the frame

setJMenuBar(menuBar);

getContentPane().setLayout(new JvBoxLayout(JvBoxLayout.Y_AXIS));

getContentPane().add(toolBar);

getContentPane().add(attrBar);

getContentPane().add(painterPanel, new Double(1.0));

// Finishing touches, title, size and location

setSize(500, 400);

setLocation(200, 50);

setTitle("Painter");

// Make sure the process stops when use closes the frame via the title

// bar close button

addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent evt) {

exit(null);

}

});

}

/**

* Activate a text area on the painter panel to enable a specific textable

* item to be edited.

*

* @param x

* @param y

* @param width

* @param height

* @param text

*/

public void activateTextEditor(int x, int y, int width, int height,

PtrTextable text) {

painterPanel.activateTextEditor(x, y, width, height, text);

}

/**

* Get the current list of draw objects.

*

* @return the current list of draw objects.

*/

public List getDrawObjects() {

return drawObjects;

}

/**

* An edit action to redo/undo add draw object

* @author dtsmith

*

*/

private class AddDrawObjectEditAction implements EditAction {

PtrDrawObject object;

public AddDrawObjectEditAction(PtrDrawObject object) {

this.object = object;

}

public void redo() {

drawObjects.add(object);

}

@Override

public void undo() {

drawObjects.remove(object);

}

}

/**

* Add a draw object to the list of draw objects. All draw objects will be

* rendered on the painter panel

*

* @param object

* the draw object to be added

*/

public void addDrawObject(PtrDrawObject object) {

executeEditAction(new AddDrawObjectEditAction(object));

repaint();

}

/**

* Add a draw object to the list of draw objects W/O support for Undo. All draw

* objects will be rendered on the painter panel

*

* This method should only be used in special cases where undo not supporte

*

* @param object

* the draw object to be added

*/

public void _addDrawObject(PtrDrawObject object) {

drawObjects.add(object);

repaint();

}

/**

* Remove a draw object to the list of draw objects.

*

* @param object

* the draw object to be removed

*/

public void removeDrawObject(PtrDrawObject object) {

// TODO need to create an EditAction, be careful to have the undo

// reinsert the removed opject at the correct location

drawObjects.remove(object);

repaint();

}

/**

* Revmove draw object to the list of draw objects W/O support for Undo. All draw

* objects will be rendered on the painter panel

*

* This method should only be used in special cases where undo not supported

*

* @param object

* the draw object to be removed

*/

public void _removeDrawObject(PtrDrawObject object) {

drawObjects.remove(object);

repaint();

}

/**

* Get the object at a given coordinate

*

* @param x

* the x coordinate

* @param y

* the y coordinate

* @return the object at a given coordinate. If the is no object at the

* coordinate, returns null.

*/

public PtrDrawObject getOver(int x, int y) {

PtrDrawObject over = null;

for (PtrDrawObject drawObject : drawObjects) {

if (drawObject.isOver(x, y)) {

over = drawObject;

}

}

return over;

}

/**

* Selects all objects in a bounding box

*

* @param x

* the x coordinate of the bounding box

* @param y

* the y coordinate of the bounding box

* @param width

* of the bounding box

* @param height

* of the bounding box

*/

public void selectObjects(int x, int y, int width, int height) {

for (PtrDrawObject drawObject : drawObjects) {

if (drawObject.isInside(x, y, width, height)) {

drawObject.setSelected(true);

}

}

repaint();

}

public void selectDefaultTool() {

defaultTool.setSelected(true);

}

/**

* Clear the current selection. Any selected objects will be unselected.

*/

public void clearSelection() {

for (PtrDrawObject drawObject : drawObjects) {

if (drawObject.isSelected()) {

drawObject.setSelected(false);

}

}

}

/**

* Get the current editor action handler that will process mouse and

* keyboard events.

*

* @return the current editor action handler that will process mouse and

* keyboard events.

*/

public PtrEditActionHandler getEditorAction() {

return editActionHandler;

}

/**

* Set the current editor action handler that will process mouse and

* keyboard events.

*

* When set to null, the selected tool will process mouse pressed events

*

* @param editActionHandler

* the new editor action handler that will process mouse and

* keyboard events.

*/

public void setEditActionHandler(PtrEditActionHandler editActionHandler) {

if (editActionHandler == null) {

addUndoMarker();

}

this.editActionHandler = editActionHandler;

}

/**

* Show a popup menu at a given x, y coordinate on the painter panel

*

* @param popupMenu

* the popup menu to be displayed

* @param x

* the x coordinate relative to the painter panel

* @param y

* the y coordinate relative to the painter panel

*/

public void showPopupMenu(JPopupMenu popupMenu, int x, int y) {

popupMenu.show(painterPanel, x, y);

}

/**

* Invoked when the mouse button has been clicked (pressed and released) on

* the paint panel.

*

* currently not used

*/

public void mouseClicked(MouseEvent e) {

}

/**

* Invoked when a mouse button has been pressed on the paint panel.

*/

public void mousePressed(MouseEvent e) {

if (editActionHandler != null) {

editActionHandler.mousePressed(this, e);

} else {

painterPanel.requestFocus();

toolGroup.getSelection().activateTool(this, e);

}

}

/**

* Invoked when a mouse button has been released on the paint panel.

*/

public void mouseReleased(MouseEvent e) {

if (editActionHandler != null) {

editActionHandler.mouseReleased(this, e);

repaint();

}

}

/**

* Invoked when the mouse enters the paint panel.

*/

public void mouseEntered(MouseEvent e) {

}

/**

* Invoked when the mouse exits the paint panel.

*/

public void mouseExited(MouseEvent e) {

}

/**

* Invoked when the mouse is dragged on the paint panel.

*/

public void mouseDragged(MouseEvent e) {

if (editActionHandler != null) {

editActionHandler.mouseDrag(this, e);

repaint();

}

}

/**

* Invoked when the mouse cursor has been moved over the paint panel but no

* buttons have been pushed.

*/

public void mouseMoved(MouseEvent e) {

}

/**

* Invoked when a key on the keyboard has been pressed

*/

public void keyPressed(KeyEvent e) {

}

/**

* Invoked when a key on the keyboard has been released

*/

public void keyReleased(KeyEvent e) {

}

/**

* Invoked when a key on the keyboard has been typed

*/

public void keyTyped(KeyEvent e) {

}

/**

* Delete the selected draw objects

*/

public void delete(ActionEvent evt) {

List removeList = new ArrayList();

for (PtrDrawObject drawObject : drawObjects) {

if (drawObject.isSelected()) {

removeList.add(drawObject);

}

}

for (PtrDrawObject drawobject : removeList) {

removeDrawObject(drawobject);

}

addUndoMarker();

repaint();

}

/**

* Indicate if the delete button should be enabled for the current selection

* state.

*

* @return true if the delete button should be enabled for the current

* selection state, otherwise false.

*/

public boolean isDeleteable(EventObject evt) {

for (PtrDrawObject drawObject : drawObjects) {

if (drawObject.isSelected()) {

return true;

}

}

return false;

}

/**

* Cut the selected draw objects. The cut objects are placed on the system

* clipboard.

*/

public void cut(ActionEvent evt) {

copy(evt);

delete(null);

}

/**

* Indicate if the cut button should be enabled for the current selection

* state.

*

* @return true if the cut button should be enabled for the current

* selection state, otherwise false.

*/

public boolean isCutable(EventObject evt) {

return isDeleteable(evt);

}

/**

* Copy the selected draw objects to the system clipboard.

*/

public void copy(ActionEvent evt) {

}

/**

* Indicate if the copy button should be enabled for the current selection

* state.

*

* @return true if the copy button should be enabled for the current

* selection state, otherwise false.

*/

public boolean isCopyable(EventObject evt) {

return isDeleteable(evt);

}

/**

* Paste any draw objects on the system clipboard into the list of draw

* objects.

*/

public void paste() {

}

/**

* Open

*

* @see com.javera.ui.actions.Openable#open(java.awt.event.ActionEvent)

*/

public void open(ActionEvent evt) {

JFileChooser fileChooser = new JFileChooser();

fileChooser.setFileFilter(new FileFilter() {

public boolean accept(File f) {

return f.isDirectory()

|| f.getName().toLowerCase().endsWith(".ptr");

}

public String getDescription() {

return "Painter Files";

}

});

if (fileChooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {

try {

ObjectInputStream in = new ObjectInputStream(

new FileInputStream(fileChooser.getSelectedFile()));

drawObjects = (ArrayList) in.readObject();

fileName = fileChooser.getSelectedFile().getAbsolutePath();

in.close();

// TODO clear the undo and redo stacks

repaint();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} catch (ClassNotFoundException e) {

e.printStackTrace();

}

}

}

/*

* (non-Javadoc)

*

* @see com.javera.ui.actions.Openable#isOpenable(java.util.EventObject)

*/

public boolean isOpenable(EventObject evt) {

return true;

}

public void save(ActionEvent evt) {

if (fileName == null) {

saveAs(evt);

return;

}

try {

ObjectOutputStream out = new ObjectOutputStream(

new FileOutputStream(fileName));

out.writeObject(drawObjects);

out.close();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

public boolean isSaveable(EventObject evt) {

return true;

}

public void saveAs(ActionEvent evt) {

JFileChooser fileChooser = new JFileChooser();

fileChooser.setFileFilter(new FileFilter() {

public boolean accept(File f) {

return f.isDirectory()

|| f.getName().toLowerCase().endsWith(".ptr");

}

public String getDescription() {

return "Painter Files";

}

});

if (fileChooser.showSaveDialog(this) == JFileChooser.APPROVE_OPTION) {

try {

String path = fileChooser.getSelectedFile().getAbsolutePath();

if (!path.endsWith(".ptr")) {

path += ".ptr";

}

new FileOutputStream(path).close();

fileName = path;

save(evt);

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

}

public boolean isSaveAsable(EventObject evt) {

return true;

}

public JInternalFrame makeNew(ActionEvent evt) {

drawObjects.clear();

repaint();

return null;

}

public boolean isNewable(EventObject evt) {

return true;

}

public void exit(ActionEvent evt) {

System.exit(0);

}

public boolean isExitable(EventObject evt) {

return true;

}

@Override

public void ungroup(ActionEvent evt) {

List groups = new ArrayList();

for (Iterator iter = getDrawObjects().iterator(); iter.hasNext();) {

PtrDrawObject object = (PtrDrawObject) iter.next();

if (object.isSelected()) {

if (object instanceof PtrDrawGroup) {

groups.add((PtrDrawGroup) object);

iter.remove();

}

}

}

for (PtrDrawGroup group : groups) {

for (PtrDrawObject object : group.getGroupedObjects()) {

object.setX((int) (object.getX() * group.getXScale() + group.getX()));

object.setY((int) (object.getY() * group.getYScale() + group.getY()));

if (object instanceof PtrDrawRect) {

PtrDrawRect rect = (PtrDrawRect) object;

rect.setWidth((int) (rect.getWidth() * group.getXScale()));

rect.setHeight((int) (rect.getHeight() * group.getYScale()));

}

addDrawObject(object);

object.setSelected(true);

}

}

repaint();

}

@Override

public boolean isUngroupable(EventObject evt) {

return true;

}

private void applyLineColor() {

for (Iterator iter = getDrawObjects().iterator(); iter.hasNext();) {

PtrDrawObject object = (PtrDrawObject) iter.next();

if (object.isSelected() && object instanceof Lineable) {

((Lineable) object).setLineColor(lineColor);

}

}

addUndoMarker();

repaint();

}

private void applyLineWidth() {

for (Iterator iter = getDrawObjects().iterator(); iter.hasNext();) {

PtrDrawObject object = (PtrDrawObject) iter.next();

if (object.isSelected() && object instanceof Lineable) {

((Lineable) object).setLineWidth(lineWidth);

}

}

addUndoMarker();

repaint();

}

private void applyColor() {

for (Iterator iter = getDrawObjects().iterator(); iter.hasNext();) {

PtrDrawObject object = (PtrDrawObject) iter.next();

if (object.isSelected() && object instanceof Lineable) {

((Colorable) object).setColor(color);

}

}

addUndoMarker();

repaint();

}

public void group(ActionEvent evt) {

boolean firstObject = true;

int x1 = 0;

int y1 = 0;

int x2 = 0;

int y2 = 0;

List groupedObjects = new ArrayList();

for (Iterator iter = getDrawObjects().iterator(); iter.hasNext();) {

PtrDrawObject object = (PtrDrawObject) iter.next();

if (object.isSelected()) {

int objectX;

int objectY;

int objectWidth;

int objectHeight;

if (object instanceof PtrDrawRect) {

PtrDrawRect rect = (PtrDrawRect) object;

if (rect.getWidth() < 0) {

rect.setX(rect.getX() + rect.getWidth());

rect.setWidth(-rect.getWidth());

}

if (rect.getHeight() < 0) {

rect.setY(rect.getY() + rect.getHeight());

rect.setHeight(-rect.getHeight());

}

objectX = rect.getX();

objectY = rect.getY();

objectWidth = rect.getWidth();

objectHeight = rect.getHeight();

} else {

objectX = object.getX();

objectY = object.getY();

objectWidth = 0;

objectHeight = 0;

}

if (firstObject) {

x1 = objectX;

y1 = objectY;

x2 = objectX + objectWidth;

y2 = objectY + objectHeight;

firstObject = false;

} else {

if (objectX < x1) {

x1 = objectX;

}

if (objectY < y1) {

y1 = objectY;

}

if (objectX + objectWidth > x2) {

x2 = objectX + objectWidth;

}

if (objectY + objectHeight > y2) {

y2 = objectY + objectHeight;

}

}

}

}

if (firstObject) {

return;

}

for (Iterator iter = getDrawObjects().iterator(); iter.hasNext();) {

PtrDrawObject object = (PtrDrawObject) iter.next();

if (object.isSelected()) {

object.setX(object.getX() - x1);

object.setY(object.getY() - y1);

object.setSelected(false);

iter.remove();

groupedObjects.add(object);

}

}

PtrDrawGroup group = new PtrDrawGroup(this, x1, y1, x2 - x1, y2 - y1, groupedObjects);

this.addDrawObject(group);

group.setSelected(true);

repaint();

}

@Override

public boolean isGroupable(EventObject evt) {

return false;

}

public Color getColor() {

return color;

}

public Color getLineColor() {

return lineColor;

}

public int getLineWidth() {

return lineWidth;

}

public Font getFont() {

return font;

}

void executeEditAction(EditAction editAction) {

// TODO in addtion to executing the action (calling redo), that action

// should be pushed to the undo stack and the redo stack should be cleared.

editAction.redo();

}

private void addUndoMarker() {

// TODO add code to push a null delimiter to the undo stack, only do not add

// a null delimited if the stack is empty or a null delimited is currently

// on top of the stack

}

private void addRedoMarker() {

// TODO add code to push a null delimiter to the redo stack, only do not add

// a null delimited if the stack is empty or a null delimited is currently

// on top of the stack

}

public void redo(ActionEvent evt) {

// TODO add code to perform a redo for the editor, that is

// pops EditActions from a redo stack, calling redo on each

//

// If the top of the stack is a null delimiter then first pop it.

// Then, while the top of the stack is not a null delimiter, pop

// the EditAction, execute its rddo method, and add it to the

// undo stack. After poping the EditActions, call addUndoMarker.

repaint();

}

public boolean isRedoable(EventObject evt) {

return true;

}

public void undo(ActionEvent evt) {

// TODO add code to perform an undo, that is

// pops EditActions from a undo stack, calling undo on each.

//

// If the top of the stack is a null delimiter then first pop it.

// Then, while the top of the stack is not a null delimiter, pop

// the EditAction, execute its undo method, and add it to the

// redo stack. After poping the EditActions, call addRedoMarker.

repaint();

}

@Override

public boolean isUndoable(EventObject evt) {

return true;

}

}

PtrDrawObject.java:

package edu.www.xxxx310.painter;

import java.awt.Color;

import java.awt.Graphics;

import java.io.IOException;

import java.io.Serializable;

import javax.swing.JPopupMenu;

import com.javera.ui.actions.CopyAction;

import com.javera.ui.actions.CutAction;

import com.javera.ui.actions.DeleteAction;

import com.javera.ui.actions.GroupAction;

import com.javera.ui.actions.UngroupAction;

/**

* Root class for all draw objects that will be rendered in the

* painter.

*

* Defines the location and selected properties. Also defines

* the signiture of methods for general questions that the painter

* or other objects may use. These methods are typically overridden

* in subclasses.

*

* Note: while this class retains the location information, it is the

* subclass that determines the meaning of the location (i.e. is the

* top-left coordinate, is the center coodinate, etc.)

*

* @author

*/

public class PtrDrawObject implements Lineable, Colorable, Serializable {

protected transient PtrEditor editor;

private int x;

private int y;

private boolean selected;

private Color lineColor;

private Color color;

private int lineWidth;

private void readObject(java.io.ObjectInputStream in)

throws IOException, ClassNotFoundException {

in.defaultReadObject();

editor= PtrEditor.getEditor();

}

/**

* Base constructor - this will always get called.

* @param editor the editor that may hold the PtrDrawObject

*/

public PtrDrawObject(PtrEditor editor) {

// Call init. Init is a hook that a subclass may override to perform

// any pre construction initialization

init(editor);

this.editor = editor;

}

/**

* Constructor setting initial location

*

* @param editor the editor that may hold the PtrDrawObject

* @param x the x coordinate

* @param y the y coordinate

*/

public PtrDrawObject(PtrEditor edtitor, int x, int y) {

this(edtitor);

setX(x);

setY(y);

}

/**

* Initialize - this method is a hook that a subclass may override. This

* enables a subclass to perform any pre construction initialization.

*

*/

public void init(PtrEditor edtitor) {

}

/**

* Get the x coordinate

*

* @return the x coordinate

*/

public int getX() {

return x;

}

/**

* An edit action to redo/undo set x

* @author dtsmith

*

*/

private class SetXEditAction implements EditAction {

int originalX;

int newX;

public SetXEditAction(int originalX, int newX) {

super();

this.originalX = originalX;

this.newX = newX;

}

public void redo() {

PtrDrawObject.this.x = newX;

}

public void undo() {

PtrDrawObject.this.x = originalX;

}

}

/**

* Set the x coodinate

*

* @param x the new x coodinate

*/

public void setX(int x) {

if (x != getX()) {

editor.executeEditAction(new SetXEditAction(getX(), x));

return;

}

}

/**

* Get the y coordinate

*

* @return the y coordinate

*/

public int getY() {

return y;

}

/**

* An edit action to redo/undo set y

* @author dtsmith

*

*/

private class SetYEditAction implements EditAction {

int originalY;

int newY;

public SetYEditAction(int originalY, int newY) {

super();

this.originalY = originalY;

this.newY = newY;

}

public void redo() {

PtrDrawObject.this.y = newY;

}

public void undo() {

PtrDrawObject.this.y = originalY;

}

}

/**

* Set the y coodinate

*

* @param y the new y coodinate

*/

public void setY(final int y) {

if (y != getY()) {

editor.executeEditAction(new SetYEditAction(getY(), y));

}

}

/**

* Set the location (i.e. both x and y coodinates)

*

* @param x the new x coodinate

* @param y the new y coodinate

*/

public void setLocation(int x, int y) {

setX(x);

setY(y);

}

/**

* Indicated if the object is currently selected

*

* @return true if the object is currently selection,

* otherwise false

*/

public boolean isSelected() {

return selected;

}

/**

* Set whether or not the object is selected

*

* @param selected use true if the object is to be selected,

* otherwise false

*/

public void setSelected(boolean selected) {

this.selected = selected;

}

/**

* Draw the rendering of this object using the supplied graphics

* object.

*

* @param g the graphics object on which to render the object

*/

public void draw(Graphics g) {

}

/**

* Indicate if the coordinate is within the bounds of the object.

*

* @param x the x coordinate to be tested

* @param y the y coordinate to be tested

* @return true if the coordinate is within the bounds of the object.

*/

public boolean isOver(int x, int y) {

return false;

}

/**

* Indicate the object lies within the bounds of a bounding box.

*

* @param x the x coordinate of the bounding box

* @param y the y coordinate of the bounding box

* @param width of the bounding box

* @param height of the bounding box

* @return true if he object lies within the bounds of a bounding box.

*/

public boolean isInside(int x, int y, int width, int height) {

return false;

}

/**

* Get the edit action handler for this object. The edit action

* handler is the object through which the painter will use to

* edit the object.

* @param x the x coordinate of the mouse event used to activate

* the action handler

* @param y the y coordinate of the mouse event used to activate

* the action handler

* @return an edit action handler used to edit the object.

*/

public PtrEditActionHandler getEditActionHandler(int x, int y) {

return null;

}

/**

* Get the pop up menu, if any, for this object. Initially defines

* cut, copy and delete.

*

* @param x the x coordinate of the mouse event used to activate

* the popup menu

* @param y the y coordinate of the mouse event used to activate

* the popup menu

* @return a popup menu for this object. If no popup menu is

* available, returns null.

*/

public JPopupMenu getPopupMenu(int x, int y) {

JPopupMenu menu = new JPopupMenu();

menu.add(CutAction.getAction());

menu.add(CopyAction.getAction());

menu.add(DeleteAction.getAction());

//menu.add(GroupAction.getAction());

//menu.add(UngroupAction.getAction());

return menu;

}

public void setColor(Color color) {

// TODO add support undo/redo of the color

this.color = color;

}

/**

* Get the color of a PtrDrawOject

* @return the color of a PtrDrawOject

*/

public Color getColor() {

return color;

}

/**

* Set the line color of a PtrDrawOject

* @param color the new color

*/

public void setLineColor(Color lineColor) {

// TODO add support undo/redo of the lineColor

this.lineColor = lineColor;

}

/**

* Get the line color of a PtrDrawOject

* @return the line color of a PtrDrawOject

*/

public Color getLineColor() {

return lineColor;

}

/**

* Set the line width of a PtrDrawOject

* @param lineWidth the new lineWidth

*/

public void setLineWidth(int lineWidth) {

// TODO add support undo/redo of the lineWidth

this.lineWidth = lineWidth;

}

/**

* Get the line width of a PtrDrawOject

* @return the line width of a PtrDrawOject

*/

public int getLineWidth() {

return lineWidth;

}

}