canvas.java

This program is show how to use java to make a view like an normal soft.

package panel;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class canvas extends Panel implements MouseListener,MouseMotionListener,MouseWheelListener
{   
	Toolkit tool;
	Image img;
	static int width,height,x,y,x1,y1;
	Canvas cnv=new Canvas();
	Dimension s;
	public canvas()
	{   
		tool=getToolkit();
	    s=tool.getScreenSize();
	    setBounds(0,0,s.width,s.height);
		
		
		img=tool.getImage("Winter.jpg");
        add(new JScrollPane(cnv));
		width=800;
		height=600;
		x=0;
		y=0;
		this.addMouseMotionListener(this);
		this.addMouseListener(this);
		this.addMouseWheelListener(this);

	}
	public void paint(Graphics g)
	{
		g.drawImage(img,x,y,width,height,cnv);
	}
	public void mousePressed(MouseEvent e)
	{
          
		  x1=(int)e.getX()-x;
		  y1=(int)e.getY()-y;
		  
		
	}
	public void mouseReleased(MouseEvent e)
	{

	}
	public void mouseEntered(MouseEvent e)
	{

	}
	public void mouseExited(MouseEvent e)
	{

	}
	public void mouseClicked(MouseEvent e)
	{
         if(e.getModifiers()==InputEvent.BUTTON1_MASK)
		{  x=x-4;
		 y=y-3;
			 width=width+8;
		   height=height+6;
		   repaint();
        }
		else if (e.getModifiers()==InputEvent.BUTTON3_MASK)
		{  
		   x=x+5;
		    y=y+3;
           width=width-8;
		   height=height-6;
		   repaint();
		}
	}
    public void mouseDragged(MouseEvent e)
	{
         x=(int)e.getX()-x1; 
		 y=(int)e.getY()-y1;
		  repaint();
	 
	}
    public void mouseMoved(MouseEvent e)
	{
           
	}
	public void mouseWheelMoved(MouseWheelEvent e)
	{
	   int i=e.getWheelRotation();
	   
		 x=x+5*i;
		 y=y+3*i;
           width=width-8*i;
		   height=height-6*i;
		   repaint();
     }
}