Assignment 8: Photo Manipulation (Due: Th, Dec 4)

<..ManipulatedPhotos.java ..>

import java.util.ArrayList;

class ManipulatedPhotos{
    public static void main(String [] args) throws Exception{
       PixelTransform pixelTransform;
       ArrayList<PhotoTransform> transform =
                              new ArrayList<PhotoTransform> ();

       /*---- collect transformations ----*/

       pixelTransform = new ReducePixel();
       transform.add( new ScaledPhoto( pixelTransform, 0.3 ) );

       transform.add( new ScaledPhoto( pixelTransform, 0.666 ) );

       pixelTransform = new RedPixel();
       transform.add( new ScaledPhoto( pixelTransform, 1 ) );

       pixelTransform = new DistortPixel();
       transform.add( new ScaledPhoto( pixelTransform, 1 ) );

       pixelTransform = new LocationScalePixel(0.33, 0.5);
       transform.add( new ScaledPhoto( pixelTransform, 0.5 ) );

       pixelTransform = new LocationScalePixel(0.3, 0.7);
       transform.add( new ScaledPhoto( pixelTransform, 0.7 ) );

       /*---- load the picture ----*/

       Photo src = new Photo( args[0] );
       int idx = args[0].lastIndexOf(’.’);
       String filename = args[0].substring(0,idx);

       /*---- transform and store pictures ----*/

       for(int i = 0; i<transform.size(); i++){
          Photo photo = src.apply( transform.get(i) );
          photo.print( filename + "-" + i + ".jpg" );
}  }  }

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<..Photo.java ..>

import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;

class Photo{
      BufferedImage image;
    Photo( String filename ) throws Exception {
       File file = new File( filename );
       image = ImageIO.read(file);
    }
    Photo( BufferedImage image ){
       this.image = image;
    }
    void print( String filename ) throws Exception {
       File file = new File( filename );
       ImageIO.write(image, "jpg", file);
       System.out.println( "--> New picture: " + filename );
    }
    Photo apply( PhotoTransform   tr ){
       BufferedImage newImage = tr.transform(image);
       return new Photo( newImage );
}  }

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<..PhotoTransform.java ..>

import java.awt.image.BufferedImage;
abstract class PhotoTransform{
       PixelTransform tr;
       double scale;
    public BufferedImage transform( BufferedImage image ){

       int width = (int) Math.round(image.getWidth() * scale);
       int height = (int) Math.round(image.getHeight() * scale);
       BufferedImage newImage = new BufferedImage(width,height,
                                 BufferedImage.TYPE_INT_RGB);

       tr.init(image);

       for(int i = 0; i < width; i++) {
          for(int j = 0; j < height; j++) {
             newImage.setRGB(i, j, tr.getPixel( i, j ));
       }  }
       return newImage;
}  }

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<..ReducePixel.java ..>

class ReducePixel extends PixelTransform{
   int getPixel(int i, int j){
      return
          image.getRGB(
             3 * i % width
             ,
             3 * j % height );
} }

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<..RedPixel.java ..>

import java.awt.Color;

class RedPixel extends PixelTransform{
   int getPixel(int i, int j){
      int intColor = image.getRGB(i,j);
      Color color = new Color( intColor );
      return new Color ( color.getRed(), 0, 0 ) . getRGB();
} }

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<..DistortPixel.java ..>

class DistortPixel extends PixelTransform{
   int getPixel(int i, int j){
      double alpha = i*1.0/width;
      double beta = j*1.0/height;
      i = (int) Math.round( alpha * alpha  * i );
      j = (int) Math.round( (1-(1-beta) *(1- beta)
                              + alpha * alpha )  * j /2 );
      return image.getRGB( i, j );
} }

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<..LocationScalePixel.java ..>

class LocationScalePixel extends PixelTransform{
     double location, scale;
   LocationScalePixel(double location, double scale){
     double sum = location + scale;
     if( sum > 1 ){
        System.err.println(
             "--- Error --- location (" + location
                       + ") scale (" + scale + ") > 1"
        );
        location /= sum;
        scale /= sum;
     };
     this.location = location;
     this.scale = scale;
   }
   int getPixel(int i, int j){
      return
         image.getRGB(
             ((int) (width*location)) + (i+width)%((int) (width*scale))
             ,
             ((int) (height*location)) + (j+height)%((int)(height*scale))
         );
   }
}

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