PathArea ignores step-over on final loop

[mlampert]

I just milled a PocketShape with type Offset and a 80% step-over - and ended up with a ridge in the middle. As it turns out PathArea ignores the step over for the last inner loop:

Capture.PNG (2.52 KiB) Viewed 422 times

The image shows the path of the inner 3 loops, you can clearly see that the mid section is wider than the step over for the other loops.

ping

[realthunder]

This is because the last loop with 80% stepover generate nothing. ClipperLib cannot collapse a loop into a line, which is a feature I also want. So, for this pocketing case, how about I add another parameter, LastStepOver, default to 50%, only applying to offset type of pocket?

[mlampert]

I'm not sure I understand the implications of your suggestion.

I played around and managed to create some serious ridges where the opening of the last loop is wider than the tool being used - which should not happen if I understand your explanation correctly.

[realthunder]

I submit a PR for this. You can try my branch at here.