fix: flame_tiled - add centered anchor point for tile rotation

[nathanaelneveux]

Description

Added a centered anchor point to SpriteBatch creation so that rotations won't move tiles into the wrong position.

Checklist

• The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs: etc).
• I have read the Contributor Guide and followed the process outlined for submitting PRs.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• I have updated/added relevant examples in examples.

Breaking Change

• Yes, this is a breaking change.
• No, this is not a breaking change.

Related Issues

I'm assuming this fixes the errant behavior described at the top of the project readme? There wasn't a lot of detail. With this patch rotations work in my project.

[spydon]

Some tests are failing, due to the update. It looks like the code change is sound, but that the tests need to be updated.

[nathanaelneveux]

I guess the only other question I have is whether this solves the issue described at the top of the README for this package and if I should remove that note with this PR?

Changing:

⚠️ Under the current sprite batch implementation, Flips are not working properly.
Any help is appreciated looking into this issue.

You might also experience extra lines while rendering due to a bug in Flutter,
see this issue.

to something like:

⚠️ Under the current sprite batch implementation you might experience extra
lines while rendering due to a bug in Flutter, see this issue.

[spydon]

I guess the only other question I have is whether this solves the issue described at the top of the README for this package and if I should remove that note with this PR?

Changing:

warning Under the current sprite batch implementation, Flips are not working properly.
Any help is appreciated looking into this issue.
You might also experience extra lines while rendering due to a bug in Flutter,
see this issue.

to something like:

warning Under the current sprite batch implementation you might experience extra
lines while rendering due to a bug in Flutter, see this issue.

Have you tried whether flips work? If they do agree the readme change sounds good.

[nathanaelneveux]

Have you tried whether flips work? If they do agree the readme change sounds good.

It doesn't fix flips - just rotations. I had a map with random flips and rotations - the rotations stuck out as broken because they were drawn in the wrong location. I assumed that flips were broken similarly but a quick test with just flipped tiles shows that is a different problem.

[spydon]

Good to know, then we'll merge this and see if someone fixes flips in the future