import java.util.*;

//  Rotates an image 90 degree clockwise
//

public class Lect422c
{
  public static void main(String[] args)
  {
    // get a picture to manipulate
    String file = FileChooser.pickAFile();
    Picture pict = new Picture (file);
    System.out.println (pict.toString());
    System.out.println ("Height: " + pict.getHeight());
    System.out.println ("Width: " + pict.getWidth());
    System.out.println ("Number of Pixels: " + (pict.getHeight() * pict.getWidth()) );
    
    // displays the original picture
    pict.explore();
    
    // modify the picture
    Picture newPict = rotate (pict);
    
    // display the picture in an interactive window
    new PictureExplorer (newPict);
    
    // save the picture to the computer
    //String file2 = FileChooser.pickAFile();
    //System.out.println(file2);
    //newPict.write (file2);
    
  }
  
 // This code will rotate the picture 90 degree in a clockwise direction
 public static Picture rotate (Picture pict)
  {
    // declare variables for the loop
    int xIndex, xIndex2;
    int yIndex, yIndex2;
    Pixel pixel1, pixel2;
    
    // get width and height of picture
    int width = pict.getWidth();
    int height = pict.getHeight();
    
    // create the "empty canvas" on which the new picture will be drawn
    Picture pict2 = new Picture (height, width);
    
    // create a for loop to access/manipulate each pixel
    for ( xIndex = 0 ; xIndex < width ; xIndex = xIndex + 1 )
      for ( yIndex = 0 ; yIndex < height ; yIndex = yIndex + 1 )
        {
         // get the pixel from the original picture base on X,Y position 
         pixel1 = pict.getPixel (xIndex, yIndex);
      
         // determine the corresponding pixel in the new picture
         xIndex2 = height - 1 - yIndex;
         yIndex2 = xIndex;
         pixel2 = pict2.getPixel (xIndex2, yIndex2);
         
         // draw the color from the original pixel to the new pixel
         java.awt.Color colorValue;
         colorValue = pixel1.getColor();
         pixel2.setColor(colorValue);

      
        }

    return pict2;
  }
}