EE3206 Java Mouse Color Panel

EE3206/EE5805 Java Programming (tut09)

There are 3 file in this exercise;

1.TestDrawableColorPanel.java (main)
2.RadioColorPanel.java
3.DrawColorPanel.java

/////////////////////////////////////////////////
//TestDrawableColorPanel.java (main)

public class TestDrawableColorPanel
{


    public static void main(String[] args)
    {
        RadioColorPanel rcp = new RadioColorPanel();
        rcp.setVisible(true);

    }
}

//////////////////////////////////////////////////
//RadioColorPanel.java

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.border.*;



public class RadioColorPanel extends JFrame
{
    public static final int WIDTH = 600;
    public static final int HEIGHT =300;

    private JPanel radioButtonPanel;
    private DrawColorPanel colorPanel;
    
    private JRadioButton blackButton;
    private JRadioButton blueButton;
    private JRadioButton greenButton;
    private JRadioButton redButton;
    private JRadioButton whiteButton;

    // to group radio button and add() them
    private ButtonGroup btg;


    RadioColorPanel()
    {
        super("Test Drawable Color Panel");
        setSize(WIDTH, HEIGHT);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setLayout(new BorderLayout(5,5) );

        radioButtonPanel = new JPanel();

        radioButtonPanel.setLayout(new FlowLayout() );

        btg= new ButtonGroup();


        blackButton = new JRadioButton("Black");
        blackButton.addItemListener(new radioColorButtonListener() );
        radioButtonPanel.add(blackButton);
        btg.add(blackButton);

        blueButton = new JRadioButton("Blue");
        blueButton.addItemListener(new radioColorButtonListener() );
        radioButtonPanel.add(blueButton);
        btg.add(blueButton);


        greenButton = new JRadioButton("Green");
        greenButton.addItemListener(new radioColorButtonListener() );
        radioButtonPanel.add(greenButton);
        btg.add(greenButton);


        redButton = new JRadioButton("Red");
        redButton.addItemListener(new radioColorButtonListener() );
        radioButtonPanel.add(redButton);
        btg.add(redButton);

        whiteButton= new JRadioButton("White");
        whiteButton.addItemListener(new radioColorButtonListener());
        radioButtonPanel.add(whiteButton);
        btg.add(whiteButton);
        
        
        //ButtonGroup is not  a subclass of Component. So a Buttongroup 
        // object cannot be added to a container

        
        
        add(radioButtonPanel, BorderLayout.NORTH);
        
        colorPanel = new DrawColorPanel();
        colorPanel.setBorder(new TitledBorder("Color Area by ( Martin Leung )") );
        add(colorPanel, BorderLayout.CENTER);

    }

    private class radioColorButtonListener implements ItemListener
    {
        public void itemStateChanged(ItemEvent e)
        {
            //make sure the source is a JRadioButton
            if (e.getSource() instanceof JRadioButton)
            {
                if(blackButton.isSelected())
                    colorPanel.drawInBlack();
                else if (blueButton.isSelected() )
                    colorPanel.drawInBlue();
                else if (greenButton.isSelected() )
                    colorPanel.drawInGreen();
                else if (redButton.isSelected() )
                    colorPanel.drawInRed();
                else if (whiteButton.isSelected() )
                    colorPanel.drawInWhite();

            }
            colorPanel.setBackground(Color.LIGHT_GRAY);
        }
    }

}

///////////////////////////////////////////////
DrawColorPanel.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

public class DrawColorPanel extends JPanel
            implements MouseListener, MouseMotionListener
{

    private Point lineStart = new Point(0,0);
    private Point mousePoint = new Point();

    private boolean blackColor =false;
    private boolean blueColor = false;
    private boolean greenColor = false;
    private boolean redColor = false;
    private boolean whiteColor = false;

    public DrawColorPanel()
  {
      super();
      addMouseMotionListener(this);
      addMouseListener(this);

  }

  public void drawInBlack()
  {
        blackColor =true;
        blueColor = false;
        greenColor = false;
        redColor = false;
        whiteColor = false;
  }

  public void drawInBlue()
  {

        blackColor =false;
        blueColor = true;
        greenColor = false;
        redColor = false;
        whiteColor = false;
  }

  public void drawInGreen()
  {

       blackColor =false;
        blueColor = false;
        greenColor = true;
        redColor = false;
        whiteColor = false;

  }

  public void drawInRed()
  {

       blackColor =false;
        blueColor = false;
        greenColor = false;
        redColor = true;
        whiteColor = false;

  }

  public void drawInWhite()
  {
       blackColor =false;
        blueColor = false;
        greenColor = false;
        redColor = false;
        whiteColor = true;
  }

  // mouse handling interface
  
  public void mouseClicked(MouseEvent e)
  {
      // get its (x,y) coord
     // mousePoint = e.getPoint();
    //  repaint();
  }

  public void mouseEntered(MouseEvent e)
  {
      //
  }

  public void mouseExited(MouseEvent e)
  {
      
  }

  public void mouseReleased(MouseEvent e)
  {
      //

  }
 public void mousePressed (MouseEvent e)
 {
     //
      lineStart.move(e.getX(), e.getY());
    //  repaint();
 }

public void mouseDragged(MouseEvent e)
{
  
     Graphics  g= getGraphics();

     
     if (blackColor == true)
         g.setColor(Color.BLACK);
     else if (blueColor ==true)
        g.setColor(Color.BLUE);
     else if (greenColor == true)
         g.setColor(Color.GREEN);
     else if (redColor == true)
         g.setColor(Color.RED);
     else if (whiteColor == true)
         g.setColor(Color.WHITE);

     mousePoint = e.getPoint();

  // the order of the 3 lines is very important...
    g.drawLine(lineStart.x, lineStart.y, e.getX(), e.getY());
    g.dispose();
    lineStart.move(e.getX(), e.getY()) ;
 //  repaint();
  
}

public void mouseMoved(MouseEvent e)
{
    //
}

public void paintComponent(Graphics g)
{
    super.paintComponent(g);

  
//g.drawLine(lineStart.x, lineStart.y, mousePoint.x, mousePoint.y);
//g.dispose();

}


}