Next up, add morphing 😎

add morphing

That's worthy of a separate lib :)

You already have gfxmorph 🤣

This is nearly done, but the ux needs some thought and work. I'm thinking something like this:

• User clicks points to create the polygon. Optionally start with existing polygon.
• Once created, vertices can be dragged.
• Clicking on an edge will split it in two, creating an extra vertex.
• Double-clicking on inside the polygon will delete and let the user create a new polygon.

This is nearly done, but the ux needs some thought and work. I'm thinking something like this:

• User clicks points to create the polygon. Optionally start with existing polygon.
• Once created, vertices can be dragged.
• Clicking on an edge will split it in two, creating an extra vertex.

All this sounds good to me!

• Double-clicking on inside the polygon will delete and let the user create a new polygon.

I think this should be explicitly called, or via imgui right click menu. Or clicking on the fill area selects the polygon and presing the "Del" key deletes it.

Interaction done! Slightly different than I said earlier:

• Can initialize the tool with an initial selection.
• If the initial selection is empty, enter polygon creation mode.
• Can also call start_new_polygon() to clear the current polygon and draw a new one.
• When creating a new polygon, clicking adds a vertex. Clicking on the first vertex again will finish the polygon.
• When created, the vertices can be dragged. When dragged on top of a neighbouring polygon, it will be deleted.
• When clicking/dragging on a line, a new vertex is inserted.

edit: in the above, a snapping visualization is applied to help the user understand that the vertex will be "merged" with the vertex under the mouse.

I just learned about bermuda, a triangulation lib implemented in Rust, a spin-off of the Napari project. We could try and see if it helps here. It would mean an extra dependency, so maybe not use it unless we need it. But we can at least do some quick benchmarks and add a note, so that in case we do need more speed, we know how to get it.