diff options
Diffstat (limited to 'lib/stitch_plan/stop.py')
| -rw-r--r-- | lib/stitch_plan/stop.py | 82 |
1 files changed, 57 insertions, 25 deletions
diff --git a/lib/stitch_plan/stop.py b/lib/stitch_plan/stop.py index 81dec1da..12a88d3a 100644 --- a/lib/stitch_plan/stop.py +++ b/lib/stitch_plan/stop.py @@ -1,43 +1,75 @@ -def process_stop(color_block): +from ..svg import PIXELS_PER_MM + +def process_stop(stitch_plan): """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). + In most machine embroidery file formats, there's no such thing as + an actual "STOP" instruction. All that exists is a "color change" + command. On multi-needle machines, the user assigns needles to the colors in - the design before starting stitching. C01, C02, etc are normal + the design before starting stitching. C01, C02, etc are the 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. + had and pause after it completes the C00 block. Machines that don't + call it C00 still have a similar concept. + + We'll add a STOP instruction at the end of this color block. + Unfortunately, we have a bit of a catch-22: the user needs to set + C00 (or equivalent) for the _start_ of this block to get the + machine to stop at the end of this block. That means it will use + the previous color, which isn't the right color at all! - 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: + For the first STOP in a given thread color, we'll need to + introduce an extra color change. The user can then set the correct + color for the first section and C00 for the second, resulting in + a stop where we want it. + + We'll try to find a logical place to split the color block, like + a TRIM or a really long stitch. Failing that, we'll just split + it in half. """ - 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 + if not stitch_plan.last_color_block or len(stitch_plan.last_color_block) < 2: + return + + last_stitch = stitch_plan.last_color_block.last_stitch + stitch_plan.last_color_block.add_stitch(last_stitch.x, last_stitch.y, stop=True) + + if len(stitch_plan) > 1: + # if this isn't the first stop in this color, then we're done + if stitch_plan.color_blocks[-2].stop_after and \ + stitch_plan.color_blocks[-2].color == stitch_plan.last_color_block.color: + return + + # We need to split this color block. Pick the last TRIM or + # the last long stitch (probably between distant patches). + + for i in xrange(len(stitch_plan.last_color_block) - 2, -1, -1): + stitch = stitch_plan.last_color_block.stitches[i] - # mark this stitch as a "stop" so that we can avoid - # adding tie stitches in ties.py - stitch.stop = True + if stitch.trim: + # ignore the trim right before the stop we just added + if i < len(stitch_plan.last_color_block) - 2: + # split after the trim + i = i + 1 + break - # insert it after the stitch - color_block.stitches.insert(-2, stitch) + if i > 0: + next_stitch = stitch_plan.last_color_block.stitches[i + 1] - # and also add a color change on this stitch, completing the C00 - # block: + if (stitch - next_stitch).length() > 20 * PIXELS_PER_MM: + break - stitch = color_block.stitches[-1].copy() - stitch.color_change = True - color_block.add_stitch(stitch) + if i == 0: + # Darn, we didn't find a TRIM or long stitch. Just chop the + # block in half. + i = len(stitch_plan.last_color_block) / 2 - # reference for the above: https://github.com/lexelby/inkstitch/pull/29#issuecomment-359175447 + new_color_block = stitch_plan.last_color_block.split_at(i) + stitch_plan.last_color_block.add_stitch(color_change=True, fake_color_change=True) + stitch_plan.add_color_block(new_color_block) |