document.write('
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  1. //Making the upper left corner of a picture black diagonally
  2. // write your code here
  3. var originalImage = new SimpleImage("duvall.jpg");
  4. for(var pixel of originalImage.values()){
  5.     var b = pixelTopLeftDiagonal(pixel, originalImage);
  6.     if(b){
  7.         setBlack(pixel);
  8.     }
  9. }
  10. print(originalImage);
  11.  
  12. function pixelTopLeftDiagonal(pixel, originalImage) {
  13.      var x = pixel.getX();
  14.      var y = pixel.getY();
  15.      if(x + y < 50){
  16.          return true;
  17.      }
  18.      return false;
  19. }
  20. function setBlack(pixel) {
  21.         pixel.setRed(0);
  22.         pixel.setGreen(0);
  23.         pixel.setBlue(0);
  24.      return pixel;
  25. }
');