/*   CS1316 Summer '09 - Image Manipulation Homework  
 * 
 *   Collaboration Statement:
 *   LIST_OF_NAMES_OR_SOURCES_GOES_HERE -or- I worked on this assignment alone.
 * 
 *   In this homework you are given a main method which prompts the user
 *   for a picture then displays it both stock and after a series of modifications
 *   have been performed on it. 
 * 
 *   Your assignment is to edit these methods such that they perform various actions
 *   on the photo. These actions are described below in the code.
 * 
 *   You MAY NOT use any methods inside of Picture or SimplePicture.
 * 
 *   Note: I have written some rudamentary framework for the methods with regards to their
 *         return statement. I did this so the code would compile; you may or may not want to
 *         change it in your solution. You may not edit the method headers!
 */

public class ImageManipulation
{
  public static Picture pic;
  
  public static void main( String[] args ) {
    pic = new Picture( FileChooser.pickAFile() );
    Picture dg, r, n;
    Picture canvas = new Picture( pic.getWidth()*2 , pic.getHeight()*2 );
    
    pic.compose( canvas , 0 , 0 );
    
    dg = decreaseGreen();
    dg.compose( canvas , pic.getWidth() , 0 );
    
    r = reverse();
    r.compose( canvas , 0 , pic.getHeight() );
    
    n = negate();
    n.compose( canvas , pic.getWidth() , pic.getHeight() );
    
    canvas.show();
  }
  
  public static Picture decreaseGreen(){
    /*   In this method, you must return 'pic' with all of its green values reduced by half.
     *   
     *   HINTS:
     *   pic.getPixels() will return a 1-D array of all of the pixels in pic
     *   pixel.getGreen() will return the green intensity in pixel as a value between 0-255 
     *   pixel.setGreen(value) will set the green value of a pixel
     */  
   
    return ret;
  }
  
  public static Picture reverse(){
    /*   In this method, you must return a copy of 'pic' with all of its pixels reversed in order.
     *   You may simply reverse the pixelArray that Picture.getPixels() returns.
     *   HINT:
     *   In order to assign a pixel's value to another pixel, you have to use pixel.setColor(anotherpixel.getColor())
     */ 
    
    return ret;
  }
  
  public static Picture negate(){
    /*   In this method, you must return 'pic' with all of its pixels negated.
     * 
     *   HINT:
     *   To negate a pixel is to swap all its color values with their complements.
     *   As an example, if a pixel had an (R,G,B) value of (1,10,100) its resulting negative
     *   would be (254,245,155). Keep in mind the maximum value for an 8-bit int is 255
     *   so 255-1=254 , 255-10=245 , 255-100=155. 
     */ 
    
    return ret;
  }
} // end Public class ImageManipulation