Signed-off-by: Wenqi Li [email protected]

Description

issue identified during developing a tutorial Project-MONAI/tutorials#747

the current implementation of matshow3d doesn't support displaying multiple subplots within the same figure()

this PR enables, a typical usage of:

plt.subplot(1, 2, 1); matshow3d(im_a, fig=plt.gca())
plt.subplot(1, 2, 2); matshow3d(im_b, fig=plt.gca())

Status

Ready

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• Quick tests passed locally by running ./runtests.sh --quick --unittests --disttests.
• In-line docstrings updated.
• Documentation updated, tested make html command in the docs/ folder.