// An example of image reading/writing in Java
//
// Digitally remove Java mascot Duke from the cake
// 
// REF: http://java.sun.com/developer/JDCTechTips/2004/tt0217.html#1
// 
// M. Branicky, 10/09/06, modified 10/11/06, more comments added 10/14/06

import java.awt.image.*;
import javax.imageio.*;
import java.io.*;

public class ImageFun
{
  // program constants for particular colors
  //
  // 0xNUM is how to input HEXadecimal number NUM (base 16: uses digits 0-F) in Java
  // See http://cloford.com/resources/colours/500col.htm for more HEX color codes
  //
  public static final int BLACK = 0, WHITE = 0xFFFFFF;

  //                       This is DIFFERENT THAN OTHER PROGRAMS BUT it is
  //                       NEEDED b/c I didn't use try-catch; see D&D, p. 647
  //                                      vvvvvvvvvvvvvvvvvv
  public static void main (String args[]) throws IOException
  {
    // open and read the input image, a .jpg file, available at
    // http://dora.case.edu/msb/131/code/bakeonceeatanywhere.jpg
    File inputFile = new File("bakeonceeatanywhere.jpg");
    BufferedImage input = ImageIO.read(inputFile);

    // Grab the starting (upper-left) indices and size of the picture
    System.out.println("MinX: "+input.getMinX());
    System.out.println("MinY: "+input.getMinY());
    System.out.println("Width: "+input.getWidth());
    System.out.println("Height: "+input.getHeight());

    // An early attempt at modifying the image, now commented out
    // result at http://dora.case.edu/msb/131/code/imagemod3.jpg
    /*
    // Replace a rectangle of pixels with the color BLACK
    // i is measured along the image's width, j along its height
    // Both are indexed starting at the image's upper-left corner
    for (int i=150; i<250; i++) {
      for (int j=100; j<200; j++) {
        input.setRGB(i,j,BLACK);
      }
    }
    */

    // More sophisticated processing:
    // i-j loops were switched b/c width is a (linear) function of height
    for (int j=95; j<208; j++) {
      for (int i=165-(j-95)/3; i<255; i++) {
        // grab a pixel at the same height in the orange rectangle,
        // but to the right of Duke, for the purpose of blending
        int cakecolor = input.getRGB(256,j);
        input.setRGB(i,j,cakecolor);
      }
    }

    // Write the output into a .jpg file
    // image available at http://dora.case.edu/msb/131/code/imagemod.jpg
    File outImage = new File("imagemod.jpg");
    ImageIO.write(input, "jpg", outImage);
  }
}