I've encountered an interesting effect of using ImageItem setImage and
setRect:
In a loop I want to continually update an the image in ImageItem with new
image data. Psuedocode follows:
img_rect = QtCore.QRectF(x0, y0, w, h)
img_item.setRect(img_rect)
for x in range(100):
img_item.setImage(img_data[x,:,:])
If the image_data has non-square pixels, each setImage will create a
bounding box that starts at x0, y0, but will not have the correct width, ie
it will be 2x wider if pixel aspect ratio is 2:1.
The fix that I had was to repeatedly setRect after each setImage:
img_rect = QtCore.QRectF(x0, y0, w, h)
img_item.setRect(img_rect)
for x in range(100):
img_item.setImage(img_data[x,:,:])
img_item.setRect(img_rect)
While this works, the behavior seems unexpected and undocumented. Should
the current behavior be considered correct? If so it should be documented.
If not where should we make the correction, I haven't dug into the
ImageItem code to discover how hard a fix this would be. I am happy to
explore with some guidance.
Thanks!
-Ed
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