// Dartmouth CS 2, Winter 2009, Chris Bailey-Kellogg
// Notes 18 | Sketch 7

size(800,463);
background(loadImage("green.jpg"));

loadPixels();
for (int y=0; y<height; y++) {
  for (int x=0; x<width/2; x++) {
    // swap (x,y) with (width-1-x,y)  (width-1 is the rightmost)
    color p = pixels[x+y*width];
    pixels[x+y*width] = pixels[(width-1)-x+y*width];
    pixels[(width-1)-x+y*width] = p;
  }
}
updatePixels();