[Pythoncard-users] drawPIL method added to BitmapCanvas

[Kevin A. <al...@se...>]

I added a drawPIL method to the BitmapCanvas widget so Roman or anyone else
can try some sample tests using images created or manipulated by PIL. The
changes are in cvs and will be part of the next release, which I hope to get
out by Tuesday, if not earlier. When your sample starts up you can check the
variable

  PythonCardPrototype.widget.PIL_FOUND

to make sure PIL exists on the local machine, or you can use a variation of
the test I currently use to set the variable in widget.py:

try:
    import Image
    PIL_FOUND = 1
except ImportError:
    PIL_FOUND = 0

I copied the trash.gif image from the proof directory into the doodle sample
directory and then typed the following lines in the shell to test out the
method.

>>> import Image
>>> source = Image.open('trash.gif')
>>> comp.bufOff.drawPIL(source, 10, 10)

Transparency appears to be lost in the conversion from PIL to wxImage to
wxBitmap, so perhaps Robin or some other wxPython expert can shed some light
on how to preserve the transparency color if available. On the other hand, I
wrote this method pretty quickly, so my code might just be buggy.

ka
---
    def drawPIL(self, image, x, y, transparency=1):
        if PIL_FOUND:
            if not self._drawingInProgress:
                self._bufImage.BeginDrawing()
                self._drawingInProgress = 1

            if (image.mode != 'RGB'):
                image = image.convert('RGB')
            imageData = image.tostring('raw', 'RGB')
            imageWx = wxEmptyImage(image.size[0], image.size[1])
            imageWx.SetData(imageData)
            bmp = wxBitmapFromImage(imageWx)
            #imageWx = apply(wxEmptyImage, image.size)
            #imageWx.SetData(image.convert("RGB").tostring() )
            #bmp = imageWx.ConvertToBitmap()
            self._bufImage.DrawBitmap(bmp, x, y, transparency)

            if self.autoRefresh:
                self._bufImage.EndDrawing()
                self._drawingInProgress = 0
                dcDelegate = wxClientDC(self._delegate)
                dcDelegate.Blit(x, y,
                                bmp.GetWidth(),
                                bmp.GetHeight(),
                                self._bufImage, x, y)