wxPython/demo/AlphaDrawing.py

   1
   2 import wx
   3
   4 #----------------------------------------------------------------------
   5
   6 class TestPanel(wx.Panel):
   7     def __init__(self, parent, log):
   8         self.log = log
   9         wx.Panel.__init__(self, parent, -1)
  10
  11         wx.StaticText(self, -1,
  12                       "On the Mac these squares should be transparent,\n"
  13                       "if the CoreGrahics option is turned on.",
  14                       (20, 20))
  15
  16         self.Bind(wx.EVT_PAINT, self.OnPaint)
  17
  18     def OnPaint(self, evt):
  19         dc = wx.PaintDC(self)
  20         rect = wx.Rect(0,0, 100, 100)
  21         for RGB, pos in [((178,  34,  34), ( 50,  70)),
  22                          (( 35, 142,  35), (110, 130)),
  23                          ((  0,   0, 139), (170,  70))
  24                          ]:
  25             r, g, b = RGB
  26             penclr   = wx.Colour(r, g, b, wx.ALPHA_OPAQUE)
  27             brushclr = wx.Colour(r, g, b, 128)   # half transparent
  28             dc.SetPen(wx.Pen(penclr))
  29             dc.SetBrush(wx.Brush(brushclr))
  30             rect.SetPosition(pos)
  31             dc.DrawRectangleRect(rect)
  32
  33
  34 #----------------------------------------------------------------------
  35
  36 def runTest(frame, nb, log):
  37     win = TestPanel(nb, log)
  38     return win
  39
  40 #----------------------------------------------------------------------
  41
  42
  43
  44 overview = """<html><body>
  45 <h2><center>Alpha Drawing</center></h2>
  46
  47 The wx.DC on Mac now supports alpha transparent drawing using pens and
  48 brushes.  This is accomplished by enabling the wx.Colour class to have
  49 a fourth component for the alpha value, where 0 is fully transparent,
  50 and 255 is fully opaque.
  51
  52 </body></html>
  53 """
  54
  55
  56
  57 if __name__ == '__main__':
  58     import sys,os
  59     import run
  60     run.main(['', os.path.basename(sys.argv[0])] + sys.argv[1:])
  61