fd363e1abc
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44260 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
92 lines
2.5 KiB
Python
92 lines
2.5 KiB
Python
#----------------------------------------------------------------------
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# Name: wxPython.lib.imageutils
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# Purpose: A collection of functions for simple image manipulations
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#
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# Author: Robb Shecter
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#
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# Created: 7-Nov-2002
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# RCS-ID: $Id$
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# Copyright: (c) 2002 by
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# Licence: wxWindows license
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#----------------------------------------------------------------------
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import wx
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def grayOut(anImage):
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"""
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Convert the given image (in place) to a grayed-out
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version, appropriate for a 'disabled' appearance.
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"""
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factor = 0.7 # 0 < f < 1. Higher is grayer.
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if anImage.HasMask():
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maskColor = (anImage.GetMaskRed(), anImage.GetMaskGreen(), anImage.GetMaskBlue())
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else:
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maskColor = None
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data = map(ord, list(anImage.GetData()))
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for i in range(0, len(data), 3):
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pixel = (data[i], data[i+1], data[i+2])
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pixel = makeGray(pixel, factor, maskColor)
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for x in range(3):
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data[i+x] = pixel[x]
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anImage.SetData(''.join(map(chr, data)))
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def makeGray((r,g,b), factor, maskColor):
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"""
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Make a pixel grayed-out. If the pixel
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matches the maskColor, it won't be
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changed.
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"""
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if (r,g,b) != maskColor:
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return map(lambda x: int((230 - x) * factor) + x, (r,g,b))
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else:
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return (r,g,b)
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def stepColour(c, step):
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"""
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stepColour is a utility function that simply darkens or lightens a
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color, based on the specified step value. A step of 0 is
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completely black and a step of 200 is totally white, and 100
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results in the same color as was passed in.
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"""
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def _blendColour(fg, bg, dstep):
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result = bg + (dstep * (fg - bg))
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if result < 0:
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result = 0
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if result > 255:
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result = 255
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return result
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if step == 100:
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return c
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r = c.Red()
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g = c.Green()
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b = c.Blue()
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# step is 0..200 where 0 is completely black
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# and 200 is completely white and 100 is the same
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# convert that to a range of -1.0 .. 1.0
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step = min(step, 200)
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step = max(step, 0)
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dstep = (step - 100.0)/100.0
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if step > 100:
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# blend with white
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bg = 255.0
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dstep = 1.0 - dstep # 0 = transparent fg; 1 = opaque fg
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else:
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# blend with black
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bg = 0.0
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dstep = 1.0 + dstep; # 0 = transparent fg; 1 = opaque fg
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r = _blendColour(r, bg, dstep)
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g = _blendColour(g, bg, dstep)
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b = _blendColour(b, bg, dstep)
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return wx.Colour(int(r), int(g), int(b))
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