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#!/usr/bin/env python3
# coding=utf-8
#
# Copyright (C) 2007 Terry Brown, terry_n_brown@yahoo.com
#
# 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.
#
from math import atan2, degrees
import inkex
from inkex import ClipPath, Filter
class InsetShadow(inkex.EffectExtension):
"""Generate a 3d edge"""
def add_arguments(self, pars):
pars.add_argument(
"--angle",
type=float,
default=45.0,
help="angle of illumination, clockwise, 45 = upper right",
)
pars.add_argument(
"--stddev", type=float, default=5.0, help="Gaussian Blur stdDeviation"
)
pars.add_argument(
"--blurheight", type=float, default=2.0, help="Gaussian Blur height"
)
pars.add_argument(
"--blurwidth", type=float, default=2.0, help="Gaussian Blur width"
)
pars.add_argument("--shades", type=int, default=2, help="Number of shades")
pars.add_argument("--bw", type=inkex.Boolean, help="Black and white")
pars.add_argument(
"--thick", type=float, default=10.0, help="stroke-width for pieces"
)
def angle_between(self, start, end, angle):
"""Return true if angle (degrees, clockwise, 0 = up/north) is between
angles start and end"""
def f(x):
"""Add 360 to x if x is less than 0"""
if x < 0:
return x + 360.0
return x
# rotate all inputs by start, => start = 0
a = f(f(angle) - f(start))
e = f(f(end) - f(start))
return a < e
def effect(self):
"""Check each internode to see if it's in one of the wedges
for the current shade. shade is a floating point 0-1 white-black"""
# size of a wedge for shade i, wedges come in pairs
delta = 360.0 / self.options.shades / 2.0
for node in self.svg.selection.filter(inkex.PathElement):
array = node.path.to_arrays()
group = None
filt = None
for shade in range(0, self.options.shades):
if self.options.bw and 0 < shade < self.options.shades - 1:
continue
start = [self.options.angle - delta * (shade + 1)]
end = [self.options.angle - delta * shade]
start.append(self.options.angle + delta * shade)
end.append(self.options.angle + delta * (shade + 1))
level = float(shade) / float(self.options.shades - 1)
last = []
result = []
for cmd, params in array:
if cmd == "Z":
last = []
continue
if last:
if cmd == "V":
point = [last[0], params[-2:][0]]
elif cmd == "H":
point = [params[-2:][0], last[1]]
else:
point = params[-2:]
ang = degrees(atan2(point[0] - last[0], point[1] - last[1]))
if self.angle_between(
start[0], end[0], ang
) or self.angle_between(start[1], end[1], ang):
result.append(("M", last))
result.append((cmd, params))
ref = point
else:
ref = params[-2:]
last = ref
if result:
if group is None:
group, filt = self.get_group(node)
new_node = group.add(node.copy())
new_node.path = result
new_node.style = "fill:none;stroke-opacity:1;stroke-width:10"
new_node.style += filt
col = 255 - int(255.0 * level)
new_node.style["stroke"] = inkex.Color((col, col, col))
def get_group(self, node):
"""
make a clipped group, clip with clone of original, clipped group
include original and group of paths.
"""
defs = self.svg.defs
clip = defs.add(ClipPath())
new_node = clip.add(node.copy())
clip_group = node.getparent().add(inkex.Group())
group = clip_group.add(inkex.Group())
clip_group.set("clip-path", clip.get_id(as_url=2))
# make a blur filter reference by the style of each path
filt = defs.add(
Filter(
x="-0.5",
y="-0.5",
height=str(self.options.blurheight),
width=str(self.options.blurwidth),
)
)
filt.add_primitive("feGaussianBlur", stdDeviation=self.options.stddev)
return group, inkex.Style(filter=filt.get_id(as_url=2))
if __name__ == "__main__":
InsetShadow().run()
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