Using PixelGrabber

a1.html

<applet code="zzz" width=350 height=250></applet>

The import statements for the program codes are

import java.applet.*;
import java.awt.*;
import java.awt.image.*;

public class zzz extends Applet
{       Image b;
        public void init()
        {       b=getImage(getDocumentBase(), "borderex1.gif");
        }
        public void update(Graphics g)
        {       paint(g);
        }
        public void paint(Graphics g)
        {       g.drawImage(b, 0, 0, this);
        }
}

public class zzz extends Applet
{       Image o;
        Graphics s;
        public void init()
        {       o=createImage(200,300);
                s = o.getGraphics();
                s.setColor(Color.red);
                s.drawString("hello",1,10);
        }
        public void update(Graphics g)
        {       paint(g);
        }
        public void paint(Graphics g)
        {       g.drawImage(o, 0, 0, this);
        }
}

public class zzz extends Applet
{       Image b,o;
        Graphics s;
        public void init()
        {       o=createImage(200,300);
                b=getImage(getDocumentBase(), "borderex1.gif");
                s = o.getGraphics();
        }
        public void update(Graphics g)
        {       paint(g);
        }
        public void paint(Graphics g)
        {       s.drawImage(b,0,0,this);
                g.drawImage(o,0,0,this);
        }
}

public class zzz extends Applet
{       Image b,o;
        Graphics s;
        int a[]=new int[800*800];
        PixelGrabber r;
        int j;
        public void init()
        {       b = getImage(getDocumentBase(), "borderex1.gif");
        }
        public void paint(Graphics g)
        {       g.drawImage(b,0,0,this);
                if ( j == 1 )
                        g.drawImage(o,250,200,this);
        }
        public boolean mouseDown(Event f,int x,int y)
        {       for(int i=0;i<160000;i++)
                        a[i]=0;
                r=new PixelGrabber(b,0,0,x,y,a,0,x);
                b.getSource().addConsumer(r);
                try r.grabPixels();
                catch(Exception e)
                {       System.out.println("err");
                }
                o=createImage(new MemoryImageSource(x,y,a,0,x));
                j=1;
                repaint();
                return true;
        }
}

public class zzz extends Applet
{       int ctr;
        int a[]=new int[800*800];
        Image b,o;
        Graphics s;
        int m,n,q,p;
        PixelGrabber r;
        int j;
        public void init()
        {       b = getImage(getDocumentBase(), "borderex1.gif");
        }
        public void paint(Graphics g)
        {       g.drawImage(b,0,0,this);
                if ( j==1)
                        g.drawImage(o,250,200,this);
        }
        public boolean mouseDown(Event f,int x,int y)
        {       if (ctr == 0)
                {       ctr++;
                        m = x;
                        n = y;
                        j=0;
                }
                else
                {       q = x;
                        p = y;
                        for(int i=0;i<160000;i++)
                                a[i]=0;
                        r=new PixelGrabber(b,m,n,q-m,p-n,a,0,x);
                        b.getSource().addConsumer(r);
                        try r.grabPixels();
                        catch(Exception e)
                        {       System.out.println("err");
                        }
                        o=createImage(new MemoryImageSource(x,y,a,0,x));
                        j=1;
                        repaint();
                        ctr = 0;
                }
                return true;
        }
}

Moving on to the next chapter which is on how to capture an area of the image (ImageMap) and do a certain job

Back to the Java Page