Re: Mirror an image

From:
Wanja Gayk <brixomatic@yahoo.com>
Newsgroups:
comp.lang.java.programmer
Date:
Sun, 13 Apr 2014 15:57:03 +0200
Message-ID:
<MPG.2db4b6049cca8fca19@202.177.16.121>
In article <lhsj1p$i60$1@dont-email.me>, Jeff Higgins
(jeff@invalid.invalid) says...

On 04/06/2014 02:18 PM, Wanja Gayk wrote:

Without any test, this would be my first, rough idea:
Have fun.


Thanks.
Here's another, not exactly per my first post
but the must be 25 ways of doing this task.

package scratch;

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;

@SuppressWarnings("serial")
public class Scratch extends JComponent {

   private BufferedImage image;


//you don't need to store the width and the height here, just get it
//again in the paint method.
//the less variables/fields you have to track in your mind the code, the
//better you will be able to read it later.

   private int width, height;

   public Scratch() {
     try {
       image = ImageIO.read(new File("/path/to/image"));
       width = image.getWidth();
       height = image.getHeight();
       setPreferredSize(new Dimension(width, 2 * height));
     } catch (IOException e) {
       e.printStackTrace();
     }
   }

   @Override
   protected void paintComponent(Graphics g) {
     super.paintComponent(g);
     Graphics2D g2d = (Graphics2D) g;
     AffineTransform restore = g2d.getTransform();


//you should set a clip here, so you don't need to paint the image in
//full height.

     g2d.drawRenderedImage(image, null);
     g2d.translate(0, 2 * height);
     g2d.scale(1, -1);
     g2d.drawRenderedImage(image, null);
     g2d.setTransform(restore);
   }


//note: using g.drawImage(img, x,y,w,h,.. ) you could
//automatically scale the image to the panel size, which may come handy.

Kind regards,
Wanja

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