A patch from Frame Niessink which adds an additional style that

[wxWidgets.git] / wxPython / demo / ImageAlpha.py
diff --git a/wxPython/demo/ImageAlpha.py b/wxPython/demo/ImageAlpha.py

index 28f44b26aaf7342c6672a0f3082db17225a98b5c..9613a8ce914c3dca3e9b922cff6cd8e6e55cfcef 100644 (file)
--- a/wxPython/demo/ImageAlpha.py
+++ b/wxPython/demo/ImageAlpha.py
@@ -5,7 +5,7 @@ from Main import opj
  
  #----------------------------------------------------------------------
  
-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):
@@ -21,22 +21,35 @@ class TestPanel(wx.Panel):
          dc.Clear()
  
          dc.SetFont(wx.Font(16, wx.SWISS, wx.NORMAL, wx.BOLD, True))
-        dc.DrawText("Bitmap alpha blending (on wxMSW and wxMac only)",
-                    (25,25))
-
+        dc.DrawText("Bitmap alpha blending (on all ports but gtk+ 1.2)",
+                    25,25)
+        
          bmp = wx.Bitmap(opj('bitmaps/toucan.png'))
-        if wx.Platform == "__WXGTK__":
-            # try to make up for it a bit...
-            bmp.SetMaskColour("black")
+        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.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)
          
  
  
@@ -54,7 +67,7 @@ overview = """<html><body>
  <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!)