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#!/usr/bin/env python
# coding=utf-8
#
# Copyright (C) 2005 Aaron Spike, aaron@ekips.org
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
"""Adds a "drop shadow" to any selected number of path objects. Optionally, the stroke
color can be used for the shadow"""
import math
import inkex
from inkex.paths import (
Move,
Line,
Curve,
ZoneClose,
Arc,
Path,
Vert,
Horz,
TepidQuadratic,
Quadratic,
Smooth,
)
from inkex.transforms import Vector2d
from inkex.bezier import beziertatslope, beziersplitatt
class Motion(inkex.EffectExtension):
"""Generate a motion path"""
def add_arguments(self, pars):
pars.add_argument(
"-a",
"--angle",
type=float,
default=45.0,
help="direction of the motion vector",
)
pars.add_argument(
"-m",
"--magnitude",
type=float,
default=100.0,
help="magnitude of the motion vector",
)
pars.add_argument(
"-f",
"--fillwithstroke",
type=inkex.Boolean,
default=False,
help="fill shadow with stroke color if set",
)
@staticmethod
def makeface(last, segment, facegroup, delx, dely):
"""translate path segment along vector"""
elem = facegroup.add(inkex.PathElement())
npt = segment.translate([delx, dely])
# reverse direction of path segment
if isinstance(segment, Curve):
rev = Curve(npt.x3, npt.y3, npt.x2, npt.y2, last[0] + delx, last[1] + dely)
elif isinstance(segment, Line):
rev = Line(last[0] + delx, last[1] + dely)
else:
raise RuntimeError("Unexpected segment type {}".format(type(segment)))
elem.path = inkex.Path(
[
Move(last[0], last[1]),
segment,
npt.to_line(Vector2d()),
rev,
ZoneClose(),
]
)
def effect(self):
delx = math.cos(math.radians(self.options.angle)) * self.options.magnitude
dely = math.sin(math.radians(self.options.angle)) * self.options.magnitude
for node in self.svg.selection.filter_nonzero(inkex.PathElement):
group = node.getparent().add(inkex.Group())
facegroup = group.add(inkex.Group())
group.append(node)
# we want delx and dely values to be correct even for the transformed path,
# so transform them back, but ignore the translate of the transform
trans = -node.transform
local_delx = trans.a * delx + trans.c * dely
local_dely = trans.b * delx + trans.d * dely
if node.transform:
group.transform = node.transform
node.transform = None
facegroup.style = node.style
if self.options.fillwithstroke:
stroke = facegroup.style("stroke")
if stroke is not None and isinstance(stroke, inkex.Color):
facegroup.style["fill"] = stroke
facegroup.style["fill-opacity"] = facegroup.style("stroke-opacity")
reset_origin = True
for cmd_proxy in node.path.to_absolute().proxy_iterator():
# for each subpath, reset the origin of the following computations to the first
# node of the subpath -> i.e. after a Z command, move the origin to the end point
# of the next command
if reset_origin:
first_point = cmd_proxy.end_point
reset_origin = False
if isinstance(cmd_proxy.command, ZoneClose):
reset_origin = True
self.process_segment(
cmd_proxy, facegroup, local_delx, local_dely, first_point
)
@staticmethod
def process_segment(cmd_proxy, facegroup, delx, dely, first_point):
"""Process each segments"""
segments = []
if isinstance(
cmd_proxy.command, (Curve, Smooth, TepidQuadratic, Quadratic, Arc)
):
prev = cmd_proxy.previous_end_point
for curve in cmd_proxy.to_curves():
bez = [prev] + curve.to_bez()
prev = curve.end_point(cmd_proxy.first_point, prev)
tees = [t for t in beziertatslope(bez, (dely, delx)) if 0 < t < 1]
tees.sort()
if len(tees) == 1:
one, two = beziersplitatt(bez, tees[0])
segments.append(Curve(*(one[1] + one[2] + one[3])))
segments.append(Curve(*(two[1] + two[2] + two[3])))
elif len(tees) == 2:
one, two = beziersplitatt(bez, tees[0])
two, three = beziersplitatt(two, tees[1])
segments.append(Curve(*(one[1] + one[2] + one[3])))
segments.append(Curve(*(two[1] + two[2] + two[3])))
segments.append(Curve(*(three[1] + three[2] + three[3])))
else:
segments.append(curve)
elif isinstance(cmd_proxy.command, (Line, Curve)):
segments.append(cmd_proxy.command)
elif isinstance(cmd_proxy.command, ZoneClose):
segments.append(Line(*first_point))
elif isinstance(cmd_proxy.command, (Vert, Horz)):
segments.append(cmd_proxy.command.to_line(cmd_proxy.end_point))
for seg in Path(
[Move(*cmd_proxy.previous_end_point)] + segments
).proxy_iterator():
if isinstance(seg.command, Move):
continue
Motion.makeface(seg.previous_end_point, seg.command, facegroup, delx, dely)
if __name__ == "__main__":
Motion().run()
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