Added sample showing Alpha drawing for Mac with CoreGraphics

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

new file mode 100644 (file)

index 0000000..8c3f973
--- /dev/null
+++ b/wxPython/demo/AlphaDrawing.py
@@ -0,0 +1,61 @@
+
+import wx
+
+#----------------------------------------------------------------------
+
+class TestPanel(wx.Panel):
+    def __init__(self, parent, log):
+        self.log = log
+        wx.Panel.__init__(self, parent, -1)
+        
+        wx.StaticText(self, -1,
+                      "On the Mac these squares should be transparent,\n"
+                      "if the CoreGrahics option is turned on.",
+                      (20, 20))
+        
+        self.Bind(wx.EVT_PAINT, self.OnPaint)
+
+    def OnPaint(self, evt):
+        dc = wx.PaintDC(self)
+        rect = wx.Rect(0,0, 100, 100)
+        for RGB, pos in [((178,  34,  34), ( 50,  70)),
+                         (( 35, 142,  35), (110, 130)),
+                         ((  0,   0, 139), (170,  70))
+                         ]:
+            r, g, b = RGB
+            penclr   = wx.Colour(r, g, b, wx.ALPHA_OPAQUE)
+            brushclr = wx.Colour(r, g, b, 128)   # half transparent
+            dc.SetPen(wx.Pen(penclr))
+            dc.SetBrush(wx.Brush(brushclr))
+            rect.SetPosition(pos)
+            dc.DrawRectangleRect(rect)
+            
+        
+#----------------------------------------------------------------------
+
+def runTest(frame, nb, log):
+    win = TestPanel(nb, log)
+    return win
+
+#----------------------------------------------------------------------
+
+
+
+overview = """<html><body>
+<h2><center>Alpha Drawing</center></h2>
+
+The wx.DC on Mac now supports alpha transparent drawing using pens and
+brushes.  This is accomplished by enabling the wx.Colour class to have
+a fourth component for the alpha value, where 0 is fully transparent,
+and 255 is fully opaque.
+
+</body></html>
+"""
+
+
+
+if __name__ == '__main__':
+    import sys,os
+    import run
+    run.main(['', os.path.basename(sys.argv[0])] + sys.argv[1:])
+