Rectangle converted into polygon after rotation

[lhapaipai]

Hi !

Actually when we rotate a rectangle, the feature is converted into a polygon and we lose the nice-to-have rectangle edition mode: when we move one point, two points are moved.

I wonder if you plan to implement this feature in the future ?

We could save the angle in a shape property ?

rectangle-polygon.prepared.mp4

[zxwild]

Yes, it's planned. The Leaflet version handles it as a rectangle. It was implemented this way initially to have behavior as predictable and straightforward as possible

[zxwild]

These operations aren't so plain as expected, for example here is how it works in the leaflet version.
It's still a rectangle with height and width :)

2026-03-09_14.22.43_.mp4

I've started in this branch: https://github.com/geoman-io/maplibre-geoman/tree/feature/rectangle-with-angle
It has more correct behavior, but there are accumulated calculation errors

2026-03-09_14.31.29_.mp4

It looks like it's required to have in properties:

• a center LngLat
• an angle
• width and height in meters

Then to recreate a rectangle:

• calculate a corners in ScreenPoints by a given center and width/height to keep it angles square
• rotate a rectangle with planar methods, not using turf or similar

[lhapaipai]

Hello @zxwild,

Thank you very much for testing the rectangles. I hadn't taken the time to think through the implications of this request... Sorry, I stepped into a critical feature.

Before addressing it, I wonder if this issue shouldn't be examined first?

#172