diag45

def diag45(pict,x,y,c):
#@param pict: Picture
#@param x: int
#@param y: int
#@param c: color

  w,h = getWidth(pict)-1, getHeight(pict)-1
  if x<0 or x>=w or y<0 or y>=h:
    return

  else:
    iter = min(w-x,h-y)
    px = getPixel(pict,x,y)
    setColor(px,c)

    for i in range(iter):
      x+=1
      y+=1
      px = getPixel(pict,x,y)
      setColor(px,c)