This is my Main class
public class Gui {
public static void main(String[] args) {
Model model = new Model();
Controller controller = new Controller(model);
View view = new View(model, controller);
}
}
This is my Controller Class
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
public class Controller implements MouseListener {
private Model model = new Model();
public Controller(Model model) {
this.model = model;
}
public static ActionListener actionListenerCircle = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Model.flag = "circle";
}
};
public static ActionListener actionListenerBox = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Model.flag = "box";
}
};
public static ActionListener actionListenerUndo = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Model.flag = "undo";
}
};
public static ActionListener actionListenerRedo = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Model.flag = "redo";
}
};
@Override
public void mouseClicked(MouseEvent e) {
if(model.flag.equals("circle")) {
Circle circle = new Circle(e.getX(), e.getY());
}
if(model.flag.equals("box")) {
Box box = new Box(e.getX(), e.getY());
}
}
@Override
public void mousePressed(MouseEvent e) {
}
@Override
public void mouseReleased(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
}
This is my View Class
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class View extends JFrame{
private Model model = new Model();
private Controller controller = new Controller(model);
private Drawing drawing = new Drawing();
public View(Model model, Controller controller) {
JFrame frame = new JFrame("Assignment1");
/**
* Size of the frame
* */
frame.setSize(600,400);
frame.setVisible(true);
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
/**
* Creating buttons to draw shapes
* */
JButton circleButton = new JButton("Circle");
JButton boxButton = new JButton("Box");
JButton redoButton = new JButton("Redo");
JButton undoButton = new JButton("Undo");
/**
* Creating a Panel in the left to add Buttons in it
* */
JPanel leftPanel = new JPanel();
leftPanel.setBackground(Color.LIGHT_GRAY);
leftPanel.setLayout(new BoxLayout(leftPanel, BoxLayout.Y_AXIS));
/**
* Panel where the shapes will be drawn
* */
Drawing rightPanel = new Drawing();
rightPanel.setBackground(Color.white);
/**
* Add buttons to the leftPanel
* */
leftPanel.add(circleButton,BorderLayout.WEST);
leftPanel.add(boxButton,BorderLayout.WEST);
leftPanel.add(undoButton, BorderLayout.WEST);
leftPanel.add(redoButton, BorderLayout.WEST);
/**
* Adding panel to the frame
* */
frame.add(leftPanel,BorderLayout.WEST);
frame.add(rightPanel);
circleButton.addActionListener(controller.actionListenerCircle);
boxButton.addActionListener(controller.actionListenerBox);
undoButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
drawing.undo();
}
});
redoButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
drawing.redo();
}
});
}
}
This is my Drawing Class
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.Iterator;
public class Drawing extends JPanel implements Command{
private Model model = new Model();
private Controller controller = new Controller(model);
public ArrayList<Shape> redrawCoordinates= new ArrayList<Shape>();
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
Shape points;
/***
* This is my Iterator Pattern
* **/
Iterator iterator = model.getCoordinates().iterator();
while(iterator.hasNext()) {
points = (Shape)iterator.next();
points.Draw(g2);
}
}
public Drawing() {
addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
if(model.flag.equals("circle")) {
Circle circle = new Circle(e.getX(), e.getY());
model.addCoordinates(circle);
}
if(model.flag.equals("box")) {
Box box = new Box(e.getX(), e.getY());
model.addCoordinates(box);
}
repaint();
}
});
}
/**
* Below is the Implementation of Command Pattern to support the Undo & Redo Operation
* */
@Override
public void undo() {
if(model.getCoordinates().size() > 0) {
System.out.println("Undo Operation");
redrawCoordinates.add(model.getCoordinates().get(model.getCoordinates().size()-1));
model.getCoordinates().remove(model.getCoordinates().size()-1);
repaint();
} else {
JOptionPane.showMessageDialog(null, "There is Nothing Left to Undo!!!");
}
}
@Override
public void redo() {
if(redrawCoordinates.size() > 0) {
System.out.println("Redo Operation");
Shape toReDraw =redrawCoordinates.get(redrawCoordinates.size()-1);
model.getCoordinates().add(toReDraw);
redrawCoordinates.remove(toReDraw);
repaint();
} else{
JOptionPane.showMessageDialog(null, "There is nothing left to Redraw!!!");
}
}
}
This is Model Class
import java.util.ArrayList;
public class Model {
private static ArrayList<Shape> coordinates;
public static String flag = "";
public Model() {
coordinates = new ArrayList<Shape>();
}
public void addCoordinates(Shape shape) {
coordinates.add(shape);
}
public void getCoordinates(int i) {
coordinates.get(i);
}
public ArrayList<Shape> getCoordinates() {
return coordinates;
}
}
This is my Shape Interface
public interface Command {
void undo();
void redo();
}
This is my Command Interface
public interface Command {
void undo();
void redo();
}
Whenever I try to make the shapes it works fine, but when I do the undo operation, it doesn't reflect at that particular time, it removes all the shapes that I have drawn but it only reflects when I click on the drawing area, then only all the shapes are removed and I end up getting one shape drawn.
I tried to debug my code, what I could understand was, my repaint() function which is in my undo() function doesn't work.
