/**
 * 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 Lect1006g
{
  
  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
    modifyPicture (p);
    
    // explore (display) the picture
    p.explore();
    
    // get a new filename and save the picture
    String saveFilename = FileChooser.pickAFile ();
    p.write (saveFilename);

  }  // end of main
  
  public static void 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);
    
    // Set up a loop to access all the X position
    int xPos;
    int yPos;
    Pixel pix;
    int redAmount;
    int greenAmount;
    int blueAmount;
    int grayAmount;
    
    for ( xPos = 0 ; xPos < width ; ++xPos )
    {
      for ( yPos = 0 ; yPos < height ; ++yPos )
      { 
        //  access the pixel to be modifed
        pix = p.getPixel (xPos, yPos);
        
        // modify the pixel
        redAmount = pix.getRed ();
        greenAmount = pix.getGreen ();
        blueAmount = pix.getBlue ();
        
        grayAmount = (int)(redAmount * 0.299 + greenAmount * 0.587 + blueAmount * 0.114);   
        
        pix.setRed (grayAmount);
        pix.setGreen (grayAmount);
        pix.setBlue (grayAmount);
        
      }
    }
  }  // end of modifyPicture
  
} // end of  class