title: Python image mirroring
body: <p>I've been making a picture mirroring in horizontal and vertical axes. Now I'm going to make the diagonal.</p>
  
  <p>I had done the hori and verti width two for loops which in the hori scenario loops through all the pixels in the height and only the half of the pixels in the width. Then it gets the color of the pixel and set the same color to the pixel on the other side. Going from the <code>getWidth(pic)</code> to the center.</p>
  
  <p>Then I have my mirror in the middle of the pic. How to do the diagonal way?</p>
  
  <p>Edit:</p>
  
  <pre><code>img_src = makePicture(pickAFile())
  W = getWidth(img_src)
  H = getHeight(img_src)
  
  for x in range(W):
          for y in range(H):
                  p = getPixel(img_src, x, y)
                  colorInSrc = getColor( getPixel(img_src, x, y) )
                  destPixel = getPixel(img_src, H-y-1, W-x-1)
                  setColor(destPixel, colorInSrc)
  </code></pre>