Add demo showing drawing of an image with an Alpha channel.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26170 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2004-03-10 06:52:36 +00:00
parent fe76311545
commit 8a88769e50
4 changed files with 69 additions and 0 deletions
--- a/wxPython/demo/ImageAlpha.py
+++ b/wxPython/demo/ImageAlpha.py
@@ -0,0 +1,66 @@
+
+import wx                  # This module uses the new wx namespace
+from Main import opj
+
+
+#----------------------------------------------------------------------
+
+msg = "This is some text that will appear behind the image..."
+
+class TestPanel(wx.Panel):
+    def __init__(self, parent, log):
+        self.log = log
+        wx.Panel.__init__(self, parent, -1)
+
+        self.Bind(wx.EVT_PAINT, self.OnPaint)
+
+
+    def OnPaint(self, evt):
+        dc = wx.PaintDC(self)
+        dc.SetBackground(wx.Brush("WHITE"))
+        dc.Clear()
+
+        dc.SetFont(wx.Font(16, wx.SWISS, wx.NORMAL, wx.BOLD, True))
+        dc.DrawText("Bitmap alpha blending (on wxMSW and wxGTK)",
+                    (25,25))
+
+        bmp = wx.Bitmap(opj('bitmaps/toucan.png'))
+        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)
+        
+
+
+#----------------------------------------------------------------------
+
+def runTest(frame, nb, log):
+    win = TestPanel(nb, log)
+    return win
+
+#----------------------------------------------------------------------
+
+
+
+overview = """<html><body>
+<h2><center>Images with Alpha</center></h2>
+
+wxMSW and wxGTK now support alpha channels of supported image
+types, and will properly blend that chennel when drawing a
+bitmap.  It is not supported yet on wxGTK, (if you would like to
+change that please submit a patch!)
+
+</body></html>
+"""
+
+
+
+if __name__ == '__main__':
+    import sys,os
+    import run
+    run.main(['', os.path.basename(sys.argv[0])] + sys.argv[1:])
+