Stroke has one flat corner, and when expanded that corner becomes very weird.

[Sam256]

Stroke has one flat corner, and when expanded that corner becomes very weird. See screenshots...

[Sam256]

This is Affinity Designer 1.9.1 btw, on macOS Big Sur (Macbook Pro 2018 model)

[Sean P]

Hi Saaaaaaaaaam,

Without the file you're using we're unable to look into it. Could you attach the file please? At a guess I would say you have more than one node on that corner however that is causing conflicts.

[Sam256]

Sure, thanks Sean, I made a stripped down version just showing the two problematic lines. If there's a way I can fix this myself that would be great to know!

(Also I have a new, less stressful username, phew!)

Possible Stroke Bug.afdesign

[Sam256]

So, I just pulled at that corner, and you're right there were two, connected nodes there! I i removed one, and all looks good (both the stroke and the expanded stroke).

I am doing a lot of boolean operations with shapes, I suspect this double point was created erroneously by the divide operation? Anyway, I'm happy to have a way to fix this now, so thanks for your help.

 

[EDIT: Just deleting one node was not enough, it skewed the shape slightly. I had to move one node out of the way, then delete the edge between them, then hold down a modifier key (I forget which one) to join the two nodes back at the correct place.]

Edited March 18, 2021 by Sam256

[Sam256]

One last thing... Is there a way to automatically clean up shapes like this that have points in the same place? And more generally to reduce the number of nodes without affecting the shape, e.g. "simplify"? Thanks.

[loukash]

11 hours ago, Sam256 said:

I suspect this double point was created erroneously by the divide operation?

Very likely.
See also this thread:

 

11 hours ago, Sam256 said:

Is there a way to automatically clean up shapes like this that have points in the same place?

Not really.
Although, if you select all nodes with the Node tool and click on the "Smooth Curves" action button in the context toolbar, sometimes it can get better. Other times it gets worse though…