Sketch Class

package paint;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;

import javax.naming.AuthenticationNotSupportedException;
import javax.swing.JComponent;

public class Sketch extends JComponent {


	//image we are going to draw
	private Image image ;
	// used to draw on
	public Graphics2D graphic ;
	 //cursor
	private int OldX , OldY , CurrentX , CurrentY;

	public Sketch (){
		setDoubleBuffered(false);

		addMouseListener(new MouseAdapter() {

			@Override
			public void mousePressed(MouseEvent e) {
				// save coord x , y when mouse is pressed

				OldX=e.getX();
				OldY=e.getY();
			}

		});

		addMouseMotionListener(new MouseMotionAdapter() {

			@Override
			public void mouseDragged(MouseEvent e) {
				// save coord x , y when mouse is moving .. gets the last point
				CurrentX=e.getX();
				CurrentY=e.getY();

				if (graphic !=null){
					graphic.drawLine(OldX , OldY , CurrentX , CurrentY);
					repaint();
					OldX = CurrentX;
					OldY = CurrentY;
				}
			}

		});
	}
		protected void paintComponent (Graphics e ) {
			if (image == null ){
				image = createImage(getSize().width, getSize().height);
				//add the line drawn to the graphic
				graphic = (Graphics2D) image.getGraphics();
				//remove sharpness
				graphic.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
			    clear();
		}
			e.drawImage(image, 0, 0, null);


	}
		public void clear(){

			graphic.setPaint(Color.white );
			//turn drawing area to white
			graphic.fillRect(0, 0, getSize().width, getSize().height);
			graphic.setPaint(Color.black );
			repaint();

		}
		public void red(){
			graphic.setPaint(Color.red);
			   System.out.println("hey");

			repaint();
		}


}