inkstitch/lib/stitch_plan/ties.py

66 wiersze
2.1 KiB
Python
Czysty Zwykły widok Historia

from copy import deepcopy
from .stitch import Stitch
2018-09-16 01:33:44 +00:00
from ..svg import PIXELS_PER_MM
def add_tie(stitches, tie_path):
if len(tie_path) < 2 or tie_path[0].no_ties:
2018-04-07 02:09:26 +00:00
# It's from a manual stitch block, so don't add tie stitches. The user
# will add them if they want them.
return
2018-09-16 01:33:44 +00:00
to_previous = tie_path[1] - tie_path[0]
length = to_previous.length()
if length > 0.5 * PIXELS_PER_MM:
# Travel back one stitch, stopping halfway there.
# Then go forward one stitch, stopping halfway between
# again.
2018-09-16 01:33:44 +00:00
# but travel at most 1.5mm
length = min(length, 1.5 * PIXELS_PER_MM)
direction = to_previous.unit()
for delta in (0.5, 1.0, 0.5, 0):
stitches.append(Stitch(tie_path[0] + delta * length * direction))
else:
# Too short to travel part of the way to the previous stitch; ust go
# back and forth to it a couple times.
for i in (1, 0, 1, 0):
stitches.append(deepcopy(tie_path[i]))
def add_tie_off(stitches):
2018-09-16 01:33:44 +00:00
add_tie(stitches, stitches[-1:-3:-1])
def add_tie_in(stitches, upcoming_stitches):
add_tie(stitches, upcoming_stitches)
def add_ties(stitch_plan):
"""Add tie-off before and after trims, jumps, and color changes."""
need_tie_in = True
for color_block in stitch_plan:
new_stitches = []
for i, stitch in enumerate(color_block.stitches):
is_special = stitch.trim or stitch.jump or stitch.color_change or stitch.stop
if is_special and not need_tie_in:
add_tie_off(new_stitches)
new_stitches.append(stitch)
need_tie_in = True
elif need_tie_in and not is_special:
new_stitches.append(stitch)
add_tie_in(new_stitches, upcoming_stitches=color_block.stitches[i:])
need_tie_in = False
else:
new_stitches.append(stitch)
color_block.replace_stitches(new_stitches)
if not need_tie_in:
# tie off at the end if we haven't already
add_tie_off(color_block.stitches)