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-rwxr-xr-xshare/extensions/motion.py174
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diff --git a/share/extensions/motion.py b/share/extensions/motion.py
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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()