@aatwork Could you also add an hcenter flag to this? You did most of the work already it just requires the same logic and arguments as vcenter, like the following at line 349

if aspectPh > aspectImg:
    w = int(ph_h * aspectImg)
    h = ph_h  # keep the height

    if hcenter:
        left = left + (ph_w - w) / 2

And add hcenter to the arguments at lines 313, 323, 327

Incredibly useful, thanks a lot.

@adamerose
I have added the hcenter flag as requested

It looks like the tests need to be updated to account for the new function arguments. I don't have any experience with this type of thing, but it looks like something such as this:
tests/shapes/test_placeholder.py @ line 508:

picture_ph._new_placeholder_pic.assert_called_once_with(image_file, True, False, False)

Might fix the tests so the travis-ci build succeeds. Perhaps worth updating your pull request with this or something better that achieves the same result.

@scanny , Any chances this will be merged?

This feature would be great to have!

This PR needs a small test fix and a rebase to get rid of the conflict.

Assuming @aatwork (or someone else) takes care of these minor issues, would you consider merging this @scanny ?