kopia lustrzana https://github.com/inkstitch/inkstitch
200 wiersze
7.0 KiB
Python
200 wiersze
7.0 KiB
Python
import sys
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import shapely.geometry
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from .element import param, EmbroideryElement, Patch
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from ..i18n import _
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from ..utils import cache, Point
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from ..stitches import running_stitch, bean_stitch
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from ..svg import parse_length_with_units
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warned_about_legacy_running_stitch = False
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class Stroke(EmbroideryElement):
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element_name = "Stroke"
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@property
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@param('satin_column', _('Satin stitch along paths'), type='toggle', inverse=True)
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def satin_column(self):
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return self.get_boolean_param("satin_column")
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@property
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def color(self):
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return self.get_style("stroke")
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@property
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def dashed(self):
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return self.get_style("stroke-dasharray") is not None
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@property
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@param('running_stitch_length_mm',
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_('Running stitch length'),
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tooltip=_('Length of stitches in running stitch mode.'),
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unit='mm',
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type='float',
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default=1.5,
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sort_index=3)
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def running_stitch_length(self):
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return max(self.get_float_param("running_stitch_length_mm", 1.5), 0.01)
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@property
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@param(
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'bean_stitch_repeats',
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_('Bean stitch number of repeats'),
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tooltip=_('Backtrack each stitch this many times. '
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'A value of 1 would triple each stitch (forward, back, forward). '
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'A value of 2 would quintuple each stitch, etc. Only applies to running stitch.'),
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type='int',
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default=0,
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sort_index=2)
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def bean_stitch_repeats(self):
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return self.get_int_param("bean_stitch_repeats", 0)
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@property
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@param('zigzag_spacing_mm',
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_('Zig-zag spacing (peak-to-peak)'),
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tooltip=_('Length of stitches in zig-zag mode.'),
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unit='mm',
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type='float',
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default=0.4,
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sort_index=3)
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@cache
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def zigzag_spacing(self):
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return max(self.get_float_param("zigzag_spacing_mm", 0.4), 0.01)
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@property
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@param('repeats',
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_('Repeats'),
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tooltip=_('Defines how many times to run down and back along the path.'),
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type='int',
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default="1",
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sort_index=1)
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def repeats(self):
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return self.get_int_param("repeats", 1)
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@property
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def paths(self):
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path = self.parse_path()
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if self.manual_stitch_mode:
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return [self.strip_control_points(subpath) for subpath in path]
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else:
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return self.flatten(path)
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@property
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@cache
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def shape(self):
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line_strings = [shapely.geometry.LineString(path) for path in self.paths]
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return shapely.geometry.MultiLineString(line_strings)
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@property
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@param('manual_stitch',
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_('Manual stitch placement'),
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tooltip=_("Stitch every node in the path. Stitch length and zig-zag spacing are ignored."),
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type='boolean',
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default=False,
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sort_index=0)
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def manual_stitch_mode(self):
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return self.get_boolean_param('manual_stitch')
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def is_running_stitch(self):
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# using stroke width <= 0.5 pixels to indicate running stitch is deprecated in favor of dashed lines
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stroke_width, units = parse_length_with_units(self.get_style("stroke-width", "1"))
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if self.dashed:
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return True
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elif stroke_width <= 0.5 and self.get_float_param('running_stitch_length_mm', None) is not None:
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# if they use a stroke width less than 0.5 AND they specifically set a running stitch
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# length, then assume they intend to use the deprecated <= 0.5 method to set running
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# stitch.
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#
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# Note that we use self.get_style("stroke_width") _not_ self.stroke_width above. We
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# explicitly want the stroke width in "user units" ("document units") -- that is, what
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# the user sees in inkscape's stroke settings.
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#
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# Also note that we don't use self.running_stitch_length_mm above. This is because we
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# want to see if they set a running stitch length at all, and the property will apply
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# a default value.
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#
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# Thsi is so tricky, and and intricate that's a major reason that we deprecated the
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# 0.5 units rule.
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# Warn them the first time.
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global warned_about_legacy_running_stitch
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if not warned_about_legacy_running_stitch:
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warned_about_legacy_running_stitch = True
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print >> sys.stderr, _("Legacy running stitch setting detected!\n\nIt looks like you're using a stroke " +
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"smaller than 0.5 units to indicate a running stitch, which is deprecated. Instead, please set " +
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"your stroke to be dashed to indicate running stitch. Any kind of dash will work.")
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# still allow the deprecated setting to work in order to support old files
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return True
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else:
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return False
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def simple_satin(self, path, zigzag_spacing, stroke_width):
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"zig-zag along the path at the specified spacing and wdith"
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# `self.zigzag_spacing` is the length for a zig and a zag
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# together (a V shape). Start with running stitch at half
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# that length:
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patch = self.running_stitch(path, zigzag_spacing / 2.0)
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# Now move the points left and right. Consider each pair
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# of points in turn, and move perpendicular to them,
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# alternating left and right.
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offset = stroke_width / 2.0
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for i in xrange(len(patch) - 1):
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start = patch.stitches[i]
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end = patch.stitches[i + 1]
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segment_direction = (end - start).unit()
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zigzag_direction = segment_direction.rotate_left()
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if i % 2 == 1:
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zigzag_direction *= -1
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patch.stitches[i] += zigzag_direction * offset
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return patch
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def running_stitch(self, path, stitch_length):
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repeated_path = []
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# go back and forth along the path as specified by self.repeats
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for i in xrange(self.repeats):
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if i % 2 == 1:
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# reverse every other pass
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this_path = path[::-1]
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else:
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this_path = path[:]
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repeated_path.extend(this_path)
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stitches = running_stitch(repeated_path, stitch_length)
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return Patch(self.color, stitches)
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def to_patches(self, last_patch):
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patches = []
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for path in self.paths:
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path = [Point(x, y) for x, y in path]
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if self.manual_stitch_mode:
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patch = Patch(color=self.color, stitches=path, stitch_as_is=True)
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elif self.is_running_stitch():
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patch = self.running_stitch(path, self.running_stitch_length)
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if self.bean_stitch_repeats > 0:
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patch.stitches = bean_stitch(patch.stitches, self.bean_stitch_repeats)
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else:
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patch = self.simple_satin(path, self.zigzag_spacing, self.stroke_width)
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if patch:
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patches.append(patch)
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return patches
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