import wx #---------------------------------------------------------------------- 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) self.redBmp = self.MakeBitmap(188, 143, 234) self.greenBmp = self.MakeBitmap(35, 142, 35) self.blueBmp = self.MakeBitmap(50, 153, 204) def MakeBitmap(self, red, green, blue, alpha=128): bmp = wx.EmptyBitmap(100, 100, 32) # Create an object that facilitates access to the bitmap's # pixel buffer pixelData = wx.AlphaPixelData(bmp) if not pixelData: raise RuntimeError("Failed to gain raw access to bitmap data.") # We have two ways to access each pixel, first we'll use an # iterator to set every pixel to the colour and alpha values # passed in. for pixel in pixelData: pixel.Set(red, green, blue, alpha) # Next we'll use the pixel accessor to draw a border pixels = pixelData.GetPixels() for x in xrange(100): pixels.MoveTo(pixelData, x, 0) pixels.Set(red, green, blue, wx.ALPHA_OPAQUE) pixels.MoveTo(pixelData, x, 99) pixels.Set(red, green, blue, wx.ALPHA_OPAQUE) for y in xrange(100): pixels.MoveTo(pixelData, 0, y) pixels.Set(red, green, blue, wx.ALPHA_OPAQUE) pixels.MoveTo(pixelData, 99, y) pixels.Set(red, green, blue, wx.ALPHA_OPAQUE) return bmp def OnPaint(self, evt): dc = wx.PaintDC(self) dc.DrawBitmap(self.redBmp, 50, 50, True) dc.DrawBitmap(self.greenBmp, 110, 110, True) dc.DrawBitmap(self.blueBmp, 170, 50, True) #---------------------------------------------------------------------- def runTest(frame, nb, log): win = TestPanel(nb, log) return win #---------------------------------------------------------------------- overview = """

Raw Bitmap Access

wx.NativePixelData and wx.AlphaPixelData provide a cross-platform way to access the platform-specific pixel buffer within a wx.Bitmap. They provide both a random access method, and an iterator interface. """ if __name__ == '__main__': import sys,os import run run.main(['', os.path.basename(sys.argv[0])] + sys.argv[1:])