Skip to content

fix(math): rotate_around_point offsets from the rotation center#2875

Open
Sanjays2402 wants to merge 1 commit into
pythonarcade:developmentfrom
Sanjays2402:fix/rotate-around-point-center
Open

fix(math): rotate_around_point offsets from the rotation center#2875
Sanjays2402 wants to merge 1 commit into
pythonarcade:developmentfrom
Sanjays2402:fix/rotate-around-point-center

Conversation

@Sanjays2402

Copy link
Copy Markdown

Closes #2753

rotate_around_point computed the rotated displacement vector correctly but added it to the target point instead of the source (the rotation center), so the result came out displaced by the source-to-target vector: rotating (5, 0) around (3, 0) by 90 degrees returned (5, 2) instead of (3, 2).

Added a regression test in tests/unit/test_math.py (fails on development, passes with the fix) that also covers the full-turn and zero-radius early returns.

rotate_around_point computed the rotated displacement vector correctly but
added it to the target point instead of the source (the rotation center), so
the result was displaced by the source-to-target vector. Rotating (5, 0)
around (3, 0) by 90 degrees returned (5, 2) instead of (3, 2).

Added a regression test covering the rotation as well as the full-turn and
zero-radius early-return paths.

Closes pythonarcade#2753
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Labels

None yet

Projects

None yet

Development

Successfully merging this pull request may close these issues.

Bug: rotate_around_point function in math.py returns incorrect results due to wrong translation

1 participant