110 lines
3.3 KiB
Python
Executable file
110 lines
3.3 KiB
Python
Executable file
#!/usr/bin/env python3
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# coding=utf-8
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#
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# Copyright (C) 2006 Jean-Francois Barraud, barraud@math.univ-lille1.fr
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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"""
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Distorts selected paths, stretching it vertically while squeezing horizontally.
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Amount is controlled by ratio parameter.
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Curve gives further effect by bunching the surface towards the ends.
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"""
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from inkex.utils import X, Y
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from pathmodifier import Diffeo
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import inkex
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class RubberStretch(Diffeo):
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"""Distort selected paths"""
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ratio = property(lambda self: -(self.options.ratio / 100))
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curve = property(lambda self: min(self.options.curve / 100, 0.99))
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def add_arguments(self, pars):
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pars.add_argument("-r", "--ratio", type=float, default=25)
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pars.add_argument("-c", "--curve", type=float, default=25)
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def applyDiffeo(self, bpt, vects=()):
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for vect in vects:
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vect[0] -= bpt[0]
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vect[1] -= bpt[1]
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vect[1] *= -1
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bpt[1] *= -1
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bx0 = self.bbox.center.x
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by0 = -self.bbox.center.y
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x, y = (bpt[0] - bx0), (bpt[1] - by0)
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sx1 = (
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1
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+ self.curve
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* (x / (self.bbox.width / 2) + 1)
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* (x / (self.bbox.width / 2) - 1)
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) * 2**self.ratio
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sy1 = (
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1
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+ self.curve
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* (y / (self.bbox.height / 2) + 1)
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* (y / (self.bbox.height / 2) - 1)
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) * 2**self.ratio
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bpt[0] = bx0 + x * sy1
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bpt[1] = by0 + y / sx1
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for vect in vects:
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dx_dx = sy1
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dx_dy = (
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x
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* 2
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* self.curve
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* y
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/ self.bbox.height
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/ self.bbox.height
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* 2**self.ratio
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)
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dy_dx = (
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-y
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* 2
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* self.curve
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* x
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/ self.bbox.width
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/ self.bbox.width
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* 2**self.ratio
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/ sx1
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/ sx1
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)
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dy_dy = 1 / sx1
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vect[0] = dx_dx * vect[X] + dx_dy * vect[Y]
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vect[1] = dy_dx * vect[X] + dy_dy * vect[Y]
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# --spherify
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# s=((x*x+y*y)/(w*w+h*h))**(-a/2)
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# bpt[0]=x0+s*x
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# bpt[1]=y0+s*y
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# for v in vects:
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# dx,dy=v
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# v[0]=(1-a/2/(x*x+y*y)*2*x*x)*s*dx+( -a/2/(x*x+y*y)*2*y*x)*s*dy
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# v[1]=( -a/2/(x*x+y*y)*2*x*y)*s*dx+(1-a/2/(x*x+y*y)*2*y*y)*s*dy
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for vect in vects:
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vect[0] += bpt[0]
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vect[1] += bpt[1]
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vect[1] *= -1
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bpt[1] *= -1
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if __name__ == "__main__":
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RubberStretch().run()
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