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def process_stop(color_block):
"""Handle the "stop after" checkbox.
The user wants the machine to pause after this patch. This can
be useful for applique and similar on multi-needle machines that
normally would not stop between colors.
In machine embroidery files, there's no such thing as an actual
"STOP" instruction. All that exists is a "color change" command
(which libembroidery calls STOP just to be confusing).
On multi-needle machines, the user assigns needles to the colors in
the design before starting stitching. C01, C02, etc are normal
needles, but C00 is special. For a block of stitches assigned
to C00, the machine will continue sewing with the last color it
had and pause after it completes the C00 block.
That means we need to add an artificial color change instruction
shortly before the current stitch so that the user can set that color
block to C00. We'll go back 3 stitches and mark the start of the C00
block:
"""
if len(color_block.stitches) >= 3:
# make a copy of the stitch and set it as a color change
stitch = color_block.stitches[-3].copy()
stitch.color_change = True
# mark this stitch as a "stop" so that we can avoid
# adding tie stitches in ties.py
stitch.stop = True
# insert it after the stitch
color_block.stitches.insert(-2, stitch)
# and also add a color change on this stitch, completing the C00
# block:
stitch = color_block.stitches[-1].copy()
stitch.color_change = True
color_block.add_stitch(stitch)
# reference for the above: https://github.com/lexelby/inkstitch/pull/29#issuecomment-359175447
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