* Company name : Synergetics India
* Code Name : JDrawver3
* A simple Java Program used to draw the basic shapes in java
* using AWT. and delegation model for handling events
* Also one can use 3 basic color to draw shapes moreover u can save the shapes and
* retrieve them...... so happy drawing.
)*
*/
import java.awt.BorderLayout;
import java.awt.Choice;
import java.awt.Color;
import java.awt.FileDialog;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
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.Hashtable;
import java.util.Vector;
public class JDrawver3 extends Frame {
/**
* Comment for <code>serialVersionUID</code>
*/
private static final long serialVersionUID = 1L;
MenuBar mainMenuBar = new MenuBar();
Menu fileMenu = new Menu("File");
Menu shapesMenu = new Menu("Shapes");
Menu aboutMenu = new Menu("About");
MenuItem openMenuItem = new MenuItem("Open");
MenuItem saveMenuItem = new MenuItem("Save");
MenuItem exitMenuItem = new MenuItem("Exit");
MenuItem newMenuItem = new MenuItem("New");
MenuItem lineMenuItem = new MenuItem("Line");
MenuItem rectangleMenuItem = new MenuItem("Rectangle");
MenuItem ellipseMenuItem = new MenuItem("Ellipse");
MenuItem eraseShape = new MenuItem("Erase");
Choice colorChoice = new Choice();
Panel mainPanel = new Panel();
Shapes currentShape = new LineShape();
Vector shapesVector = new Vector();
Hashtable colorhash = new Hashtable();
Color currentColor = Color.BLACK;
FileDialog saveFileDailog = new FileDialog(this, "Save", FileDialog.SAVE);
FileDialog openFileDailog = new FileDialog(this, "Open", FileDialog.LOAD);
public void addChoice() {
setLayout(new BorderLayout());
add(mainPanel, BorderLayout.NORTH);
colorChoice.add("Black");
colorhash.put("Black", Color.BLACK);
colorChoice.add("Red");
colorhash.put("Red", Color.RED);
colorChoice.add("Blue");
colorhash.put("Blue", Color.BLUE);
colorChoice.add("Green");
colorhash.put("Green", Color.GREEN);
mainPanel.add(colorChoice);
}
public void addMenu() {
fileMenu.add(newMenuItem);
fileMenu.add(openMenuItem);
fileMenu.add(saveMenuItem);
fileMenu.add(exitMenuItem);
shapesMenu.add(lineMenuItem);
shapesMenu.add(rectangleMenuItem);
shapesMenu.add(ellipseMenuItem);
shapesMenu.add(eraseShape);
mainMenuBar.add(fileMenu);
mainMenuBar.add(shapesMenu);
setMenuBar(mainMenuBar);
}
public void addListeners() {
addWindowListener(new CloseWindowListener());
lineMenuItem.addActionListener(new LineListener());
rectangleMenuItem.addActionListener(new RectangleListener());
ellipseMenuItem.addActionListener(new EllipseListener());
eraseShape.addActionListener(new EraseListener());
addMouseListener(new NetJDrawMouseListener());
addMouseMotionListener(new NetJDrawMouseMotionListener());
colorChoice.addItemListener(new ColorListener());
saveMenuItem.addActionListener(new SaveListener());
openMenuItem.addActionListener(new OpenListener());
exitMenuItem.addActionListener(new ExitListener());
newMenuItem.addActionListener(new NewLsitener());
}
public JDrawver3() {
// Add the menus to the Frame
addMenu();
addListeners();
addChoice();
setVisible(true);
// Problem: The window is not maximized, and it does not close
setSize(400, 400);
// Problem: The window is maximized but it still does not close
// So by adding handleEvent() method one can use various fields and
// write the
// implementation for Handling events using if else or switch case
// Introduce the Delegation Model and implement the
// ActionListener/Adapter using Inner Classes
// add the MouseListener with the mousePressed and mouseReleased methods
// add the if else for various shapes....
// since the shapes appear only after the mouse release event fired
// add MouseMotionListener with the implementation for mouseDragged
// method
// in mouse Pressed get the x1, and y1 coordinates and in mouse Released
// get
// the x2 and y2 coordinates the shapes still appear only after the
// mouse
// click only............
// so rectify this error by getting the x2 and y2 coordinates in
// MouseMotion
// Listener with implementation of mouseDragged method get the x2 and y2
// coordinates in
// method and draw the respective shape in mouseDragged method.....
// now since there are lots a lines being drawn instead of 1 line u need
// to use XORMode
// to prevent the unecessary lines from being drawn
// so get the instance of Graphics and set XORMode(Color.WHITE);... then
// redraw the shape so dat the extra lines drawn will get erased... by
// the XORMode shapes
// Drawn ... the steps hav 2 b followed in the mouseReleased and
// mouseDragged methods
}
class ExitListener implements ActionListener {
public void actionPerformed(ActionEvent ae) {
System.exit(0);
}
}
class NewLsitener implements ActionListener {
public void actionPerformed(ActionEvent ae) {
shapesVector.clear();
repaint();
}
}
class OpenListener implements ActionListener {
public void actionPerformed(ActionEvent ae) {
openFileDailog.show(true);
System.out.println(openFileDailog.getDirectory()
+ openFileDailog.getFile());
System.out.println(openFileDailog.getFile());
String fileName = openFileDailog.getDirectory()
+ openFileDailog.getFile();
System.out.println("Filename " + fileName);
File openFile = new File(fileName);
ObjectInputStream ois = null;
try {
Graphics g = getGraphics();
ois = new ObjectInputStream(new FileInputStream(openFile));
shapesVector = (Vector) ois.readObject();
repaint();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
ois.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
}
class SaveListener implements ActionListener {
public void actionPerformed(ActionEvent ae) {
saveFileDailog.show(true);
String fileName = saveFileDailog.getDirectory() + ""
+ saveFileDailog.getFile();
System.out.println(fileName);
//File saveFile = new File(fileName);
ObjectOutputStream oos = null;
try {
oos = new ObjectOutputStream(new FileOutputStream(fileName));
oos.writeObject(shapesVector);
oos.flush();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
oos.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
}
class ColorListener implements ItemListener {
public void itemStateChanged(ItemEvent ie) {
String colorSelected = colorChoice.getSelectedItem();
currentColor = (Color) colorhash.get(colorSelected);
}
}
class LineListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
currentShape = new LineShape();
}
}
class RectangleListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
currentShape = new RectangleShape();// 3rd
}
}
class EllipseListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
currentShape = new EllipseShape();// 3rd
}
}
class EraseListener implements ActionListener
{
public void actionPerformed(ActionEvent ae) {
currentShape = new Eraser();
}
}
class NetJDrawMouseMotionListener extends MouseMotionAdapter {
public void mouseDragged(MouseEvent me) {
if (currentShape.getClass().getName() == "Eraser") {
Graphics g1 = getGraphics();// 4thb
g1.setXORMode(Color.WHITE);// 4thb
currentShape.drawCursor(g1);// 4thb
Graphics g = getGraphics();// 2nd
currentShape.setStartPoint(me.getPoint());// 2nd
currentShape.drawCursor(g);// 2nd
} else {
Graphics g1 = getGraphics();// 4thb
g1.setXORMode(Color.WHITE);// 4thb
currentShape.draw(g1);// 4thb
currentShape.setEndPoint(me.getPoint());// 2nd
currentShape.draw(g1);// 2nd
}
}
}
class NetJDrawMouseListener extends MouseAdapter {
public void mousePressed(MouseEvent me) {
currentShape.setForegroundColor(currentColor);
currentShape.setStartPoint(me.getPoint());// 1st
currentShape.setEndPoint(me.getPoint());// 1st
}
public void mouseReleased(MouseEvent me) {
Graphics g = getGraphics();// 1st
currentShape.setEndPoint(me.getPoint());// 1st
currentShape.draw(g);// 1st
shapesVector.addElement(currentShape);// 5tha
currentShape = currentShape.newShape();
}
}
public void paint(Graphics g) {
for (int i = 0; i < shapesVector.size(); i++) {
Shapes temp = (Shapes) shapesVector.elementAt(i);
temp.draw(g);
}
}// 5thb
class CloseWindowListener extends WindowAdapter {
public void windowClosing(WindowEvent we) {
System.exit(0);
}
}
public static void main(String[] args) {
JDrawver3 njd = new JDrawver3();
}
}
import java.awt.Graphics;
/*
* Created on Dec 12, 2005
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
/**
* @author nimeshoza
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
public class EllipseShape extends Shapes{
public void draw(Graphics g) {
int x1 = getStartPoint().x;
int y1 = getStartPoint().y;
int x2 = getEndPoint().x;
int y2 = getEndPoint().y;
g.setColor(getForegroundColor());
g.drawOval(x1, y1, x2 - x1, y2 - y1);
}//3rd
/* (non-Javadoc)
* @see Shapes#newShape()
*/
public Shapes newShape() {
// TODO Auto-generated method stub
return new EllipseShape();
}//6th
}
import java.awt.Graphics;
public class Eraser extends Shapes{
public Eraser() {
}
public void drawCursor(Graphics g)
{
g.drawRect(getStartPoint().x - 10, getStartPoint().y - 10, 18, 18 );
System.out.println("drawCursor");
}
/* (non-Javadoc)
* @see Shapes#draw(java.awt.Graphics)
*/
public void draw(Graphics g) {
}
/* (non-Javadoc)
* @see Shapes#newShape()
*/
public Shapes newShape() {
// TODO Auto-generated method stub
return new Eraser();
}
}
import java.awt.Graphics;
public class LineShape extends Shapes{
public void draw(Graphics g) {
g.setColor(getForegroundColor());
g.drawLine(getStartPoint().x, getStartPoint().y, getEndPoint().x, getEndPoint().y);
}
/* (non-Javadoc)
* @see Shapes#newShape()
*/
public Shapes newShape() {
// TODO Auto-generated method stub
return new LineShape();
}//6th
}
import java.awt.Graphics;
/*
* Created on Dec 12, 2005
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
/**
* @author nimeshoza
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
public class RectangleShape extends Shapes{
public void draw(Graphics g) {
int x1 = getStartPoint().x;
int y1 = getStartPoint().y;
int x2 = getEndPoint().x;
int y2 = getEndPoint().y;
g.setColor(getForegroundColor());
g.drawRect(x1, y1, x2 - x1, y2 - y1);
}//3rd
/* (non-Javadoc)
* @see Shapes#newShape()
*/
public Shapes newShape() {
// TODO Auto-generated method stub
return new RectangleShape();
}//6th
}
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.io.Serializable;
/*
* Created on Dec 12, 2005
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
/**
* @author nimeshoza
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
public abstract class Shapes implements Serializable{
Point startPoint = new Point(0, 0);
Point endPoint = new Point(0, 0);
Color foregroundColor = new Color(0);
public Color getForegroundColor() {
return foregroundColor;
}
public void setForegroundColor(Color foregroundColor) {
this.foregroundColor = foregroundColor;
}
public Point getEndPoint() {
return endPoint;
}
public void setEndPoint(Point endPoint) {
this.endPoint = endPoint;
}
public Point getStartPoint() {
return startPoint;
}
public void setStartPoint(Point startPoint) {
this.startPoint = startPoint;
}
public abstract void draw(Graphics g);
public abstract Shapes newShape();//6th
public void drawCursor(Graphics g)
{}
}
Edited by nimzyjava, 28 December 2005 - 01:02 AM.
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