/**
 * Simple Picture manipulation
 * 
 * @author Pat Troy: troy AT uic DOT edu
 */

// Note the name of the class in the following line MUST
// match the name of the file.  This is stored in a file
// named: Template.java 
public class Lect1101e
{
  
  public static void main (String[] args) 
  {
    // Access and open the picture
    String filename = FileChooser.pickAFile ();
    Picture p = new Picture (filename);
    
    // call the method to modify the Pictture
    Picture p2;
    p2 = modifyPicture (p);
    
    // explore (display) the picture
    p2.explore();
    
    // get a new filename and save the picture
    //String saveFilename = FileChooser.pickAFile ();
    //p2.write (saveFilename);

  }  // end of main
  
  public static Picture modifyPicture (Picture p)
  {
    // get the width and height of the picture
    int width = p.getWidth();
    int height = p.getHeight();
    System.out.println ("Width: " + width + ", Height: " + height);
    
    // create the new Picture that will be returned
    Picture resultPicture;
    resultPicture = new Picture (width , height);
    
    // Set up a loop to access all the X position
    int xPos;
    int yPos;
    int xOrig;
    int yOrig;
    int xNew;
    int yNew;
    Pixel pix1a;
    Pixel pix1b;
    Pixel pix1c;
    Pixel pix2;   
    int red;
    int green;
    int blue;
    
    for ( xPos = 0 ; xPos < width -1 ; ++xPos )
    {
      for ( yPos = 0 ; yPos < height - 1 ; ++yPos )
      { 
        //  access the pixel to be modifed
        
        pix1a = p.getPixel (xPos, yPos);
        pix1b = p.getPixel (xPos + 1, yPos);
        pix1c = p.getPixel (xPos, yPos + 1);
        
        pix2 = resultPicture.getPixel (xPos, yPos);
        
        if ( (Pixel.colorDistance (pix1a.getColor(), pix1b.getColor()) < 25)  &&
             (Pixel.colorDistance (pix1a.getColor(), pix1c.getColor()) < 25) )
        {
          // set those color values into the result pixel
          pix2.setRed(255);
          pix2.setGreen(255);
          pix2.setBlue(255);
        }
        else
        {
          // set those color values into the result pixel
          pix2.setRed(0);
          pix2.setGreen(0);
          pix2.setBlue(0);
        }
      }
    }
    
    return resultPicture;
  }  // end of modifyPicture
  
} // end of  class