wxPython/wx/lib/imageutils.py

   1 #----------------------------------------------------------------------
   2 # Name:        wxPython.lib.imageutils
   3 # Purpose:     A collection of functions for simple image manipulations
   4 #
   5 # Author:      Robb Shecter
   6 #
   7 # Created:     7-Nov-2002
   8 # RCS-ID:      $Id$
   9 # Copyright:   (c) 2002 by
  10 # Licence:     wxWindows license
  11 #----------------------------------------------------------------------
  12
  13 from __future__ import nested_scopes
  14
  15
  16 def grayOut(anImage):
  17     """
  18     Convert the given image (in place) to a grayed-out
  19     version, appropriate for a 'disabled' appearance.
  20     """
  21     factor = 0.7        # 0 < f < 1.  Higher is grayer.
  22     if anImage.HasMask():
  23         maskColor = (anImage.GetMaskRed(), anImage.GetMaskGreen(), anImage.GetMaskBlue())
  24     else:
  25         maskColor = None
  26     data = map(ord, list(anImage.GetData()))
  27
  28     for i in range(0, len(data), 3):
  29         pixel = (data[i], data[i+1], data[i+2])
  30         pixel = makeGray(pixel, factor, maskColor)
  31         for x in range(3):
  32             data[i+x] = pixel[x]
  33     anImage.SetData(''.join(map(chr, data)))
  34
  35
  36 def makeGray((r,g,b), factor, maskColor):
  37     """
  38     Make a pixel grayed-out. If the pixel
  39     matches the maskColor, it won't be
  40     changed.
  41     """
  42     if (r,g,b) != maskColor:
  43         return map(lambda x: int((230 - x) * factor) + x, (r,g,b))
  44     else:
  45         return (r,g,b)