Stitch staggering affected by culling (reposted from #27)

[golanlevin]

Hi @LingDong-
I've closed #27 and opened a new issue that @tatyanade pointed out there:

Staggering gets eliminated at some point when two shapes are culled - visible in lower part of circles on the left - both are parallel hatch with hatch spacing of 2 and second one is spacing of 4

[golanlevin]

Or is there a way to use beginOptimize() etcetera to address this?

[LingDong-]

Maybe we should recommend using PEmbroiderBooleanGraphics for achieving this effect. The culling happens after the shapes are drawn and doesn't have access to the original parameters, so it's always going to be less perfect

Additionally to achieve the culling the polylines has to be resampled, and the original stitch placement are of course ruined

[golanlevin]

OK, I will try making a demo to compare.

[golanlevin]

@LingDong- , it's what you recommended.

@tatyanade , please study the following test project to see what's going on here:
examples/tests/PEmbroider_culling_stitch_stagger/PEmbroider_culling_stitch_stagger.pde