#----------------------------------------------------------------------
-msg = "This is some text that will appear behind the image..."
+msg = "Some text will appear mixed in the image's shadow..."
class TestPanel(wx.Panel):
def __init__(self, parent, log):
dc.Clear()
dc.SetFont(wx.Font(16, wx.SWISS, wx.NORMAL, wx.BOLD, True))
- dc.DrawText("Bitmap alpha blending (on wxMSW and wxMac)",
- (25,25))
-
+ dc.DrawText("Bitmap alpha blending (on all ports but gtk+ 1.2)",
+ 25,25)
+
bmp = wx.Bitmap(opj('bitmaps/toucan.png'))
- dc.DrawBitmap(bmp, (25,100), True)
+ if "gtk1" in wx.PlatformInfo:
+ # Try to make up for lack of alpha support in wxGTK (gtk+
+ # 1.2) by converting the alpha blending into a
+ # transparency mask.
+
+ # first convert to a wx.Image
+ img = bmp.ConvertToImage()
+
+ # Then convert the alpha channel to a mask, specifying the
+ # threshold below which alpha will be made fully
+ # transparent
+ img.ConvertAlphaToMask(220)
+
+ # convert back to a wx.Bitmap
+ bmp = img.ConvertToBitmap()
+
+
+ dc.DrawBitmap(bmp, 25,100, True)
dc.SetFont(self.GetFont())
y = 75
for line in range(10):
y += dc.GetCharHeight() + 5
- dc.DrawText(msg, (200, y))
- dc.DrawBitmap(bmp, (250,100), True)
+ dc.DrawText(msg, 200, y)
+ dc.DrawBitmap(bmp, 250,100, True)
<h2><center>Images with Alpha</center></h2>
wxMSW and wxMac now support alpha channels of supported image
-types, and will properly blend that chennel when drawing a
+types, and will properly blend that channel when drawing a
bitmap. It is not supported yet on wxGTK, (if you would like to
change that please submit a patch!)
+<p>On wxGTK this demo turns the alpha channel into a 1-bit mask, so
+yes, it looks like crap. Please help us fix it!
+
</body></html>
"""
projects / wxWidgets.git / blobdiff