Java Code

Java Code

If you are a beginner in Java, I know you want to create something using Java. For this, I am giving you a sample code of a Sketch Pad. Now create your own paint board.

The code is here. Just type the code(or copy the code) in Eclipse. And run the project. Remember that the class name should match with the code.

//file: SketchPad.java

//author@Eather

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class SketchPad extends JFrame {

  public SketchPad( ) {

    super("SketchPad");

    Container content = getContentPane( );

    content.setLayout(new BorderLayout( ));

    final DrawPad drawPad = new DrawPad( );

    content.add(drawPad, BorderLayout.CENTER);

    JPanel p = new JPanel( );

    JButton clearButton = new JButton("Clear Pad");

    clearButton.addActionListener(new ActionListener( ) {

      public void actionPerformed(ActionEvent e) {

        drawPad.clear( );

      }

    });

    p.add(clearButton);

    content.add(p, BorderLayout.SOUTH);

    setSize(280, 300);

    setLocation(100, 100);

    addWindowListener(new WindowAdapter( ) {

      public void windowClosing(WindowEvent e) {

        System.exit(0);

      }

    });

    setVisible(true);

  }

  public static void main(String[] args) {

    new SketchPad( );

  }

} // end of class SketchPad

class DrawPad extends JComponent {

  Image image;

  Graphics2D graphics2D;

  int currentX, currentY, oldX, oldY;

 

  public DrawPad( ) {

    setDoubleBuffered(false);

    addMouseListener(new MouseAdapter( ) {

      public void mousePressed(MouseEvent e) {

        oldX = e.getX( );

        oldY = e.getY( );

      }

    });

    addMouseMotionListener(new MouseMotionAdapter( ) {

      public void mouseDragged(MouseEvent e) {

        currentX = e.getX( );

        currentY = e.getY( );

        if (graphics2D != null)

          graphics2D.drawLine(oldX, oldY, currentX, currentY);

        repaint( );

        oldX = currentX;

        oldY = currentY;

      }

    });

  }

 

  public void paintComponent(Graphics g) {

    if (image == null) {

      image = createImage(getSize().width, getSize( ).height);

      graphics2D = (Graphics2D)image.getGraphics( );

      graphics2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

          RenderingHints.VALUE_ANTIALIAS_ON);

      clear( );

    }

    g.drawImage(image, 0, 0, null);

  }

 

  public void clear( ) {

    graphics2D.setPaint(Color.white);

    graphics2D.fillRect(0, 0, getSize().width, getSize( ).height);

    graphics2D.setPaint(Color.black);

    repaint( );

  }

}

And this it the code. So, have fun with your own application. Thanks......