From: tavmjong Date: Tue, 12 May 2009 11:51:46 +0000 (+0000) Subject: Add Parametric Curves extension/effect from Michel Chatelain. X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=79999cd0b2ce93ee23d29a3ba25a341a5c81af59;p=inkscape.git Add Parametric Curves extension/effect from Michel Chatelain. --- diff --git a/share/extensions/Makefile.am b/share/extensions/Makefile.am index 0dd0a2cf6..70f820eae 100644 --- a/share/extensions/Makefile.am +++ b/share/extensions/Makefile.am @@ -80,6 +80,7 @@ extensions = \ measure.py \ motion.py \ outline2svg.pl \ + param_curves.py \ pathalongpath.py\ pathscatter.py\ pathmodifier.py\ @@ -202,6 +203,7 @@ modules = \ measure.inx \ motion.inx \ outline2svg.inx \ + param_curves.inx \ pathalongpath.inx\ pathscatter.inx\ perfectboundcover.inx \ diff --git a/share/extensions/param_curves.inx b/share/extensions/param_curves.inx new file mode 100644 index 000000000..5c6b408e4 --- /dev/null +++ b/share/extensions/param_curves.inx @@ -0,0 +1,50 @@ + + + <_name>Parametric Curves + org.inkscape.effect.param_curves + param_curves.py + inkex.py + + + 0.0 + 1.0 + true + -1.0 + 1.0 + -1.0 + 1.0 + 30 + false + + + <_param name="funcplotuse" type="description">Select a rectangle before calling the extension; +it will determine X and Y scales. + +First derivatives are always determined numerically. + + + <_param name="pythonfunctions" type="description">Standard Python math functions are available: + +ceil(x); fabs(x); floor(x); fmod(x,y); frexp(x); ldexp(x,i); +modf(x); exp(x); log(x [, base]); log10(x); pow(x,y); sqrt(x); +acos(x); asin(x); atan(x); atan2(y,x); hypot(x,y); +cos(x); sin(x); tan(x); degrees(x); radians(x); +cosh(x); sinh(x); tanh(x). + +The constants pi and e are also available. + + + cos(3*t) + sin(5*t) + true + false + + rect + + + + + + diff --git a/share/extensions/param_curves.py b/share/extensions/param_curves.py new file mode 100644 index 000000000..32f4b8c80 --- /dev/null +++ b/share/extensions/param_curves.py @@ -0,0 +1,252 @@ +#!/usr/bin/env python +''' +Copyright (C) 2009 Michel Chatelain. +Copyright (C) 2007 Tavmjong Bah, tavmjong@free.fr +Copyright (C) 2006 Georg Wiora, xorx@quarkbox.de +Copyright (C) 2006 Johan Engelen, johan@shouraizou.nl +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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + +Changes: + * This program is derived by Michel Chatelain from funcplot.py. His changes are in the Public Domain. + * Michel Chatelain, 17-18 janvier 2009, a partir de funcplot.py + * 20 janvier 2009 : adaptation a la version 0.46 a partir de la nouvelle version de funcplot.py + +''' + +import inkex, simplepath, simplestyle +from math import * +from random import * + +def drawfunction(t_start, t_end, xleft, xright, ybottom, ytop, samples, width, height, left, bottom, + fx = "cos(3*t)", fy = "sin(5*t)", times2pi = False, isoscale = True, drawaxis = True): + + if times2pi == True: + t_start = 2 * pi * t_start + t_end = 2 * pi * t_end + + # coords and scales based on the source rect + scalex = width / (xright - xleft) + xoff = left + coordx = lambda x: (x - xleft) * scalex + xoff #convert x-value to coordinate + scaley = height / (ytop - ybottom) + yoff = bottom + coordy = lambda y: (ybottom - y) * scaley + yoff #convert y-value to coordinate + + # Check for isotropic scaling and use smaller of the two scales, correct ranges + if isoscale: + if scaley=0: + # xaxis + a.append(['M ',[left, coordy(0)]]) + a.append([' l ',[width, 0]]) + # check for visibility of y-axis + if xleft<=0 and xright>=0: + # xaxis + a.append([' M ',[coordx(0),bottom]]) + a.append([' l ',[0, -height]]) + + # initialize functions and derivatives for 0; + # they are carried over from one iteration to the next, to avoid extra function calculations. + x0 = f1(t_start) + y0 = f2(t_start) + + # numerical derivatives, using 0.001*step as the small differential + t1 = t_start + ds # Second point AFTER first point (Good for first point) + x1 = f1(t1) + y1 = f2(t1) + dx0 = (x1 - x0)/ds + dy0 = (y1 - y0)/ds + + # Start curve + a.append([' M ',[coordx(x0), coordy(y0)]]) # initial moveto + for i in range(int(samples-1)): + t1 = (i+1) * step + t_start + t2 = t1 - ds # Second point BEFORE first point (Good for last point) + x1 = f1(t1) + x2 = f1(t2) + y1 = f2(t1) + y2 = f2(t2) + + # numerical derivatives + dx1 = (x1 - x2)/ds + dy1 = (y1 - y2)/ds + + # create curve + a.append([' C ', + [coordx(x0 + (dx0 * third)), coordy(y0 + (dy0 * third)), + coordx(x1 - (dx1 * third)), coordy(y1 - (dy1 * third)), + coordx(x1), coordy(y1)] + ]) + t0 = t1 # Next segment's start is this segments end + x0 = x1 + y0 = y1 + dx0 = dx1 # Assume the functions are smooth everywhere, so carry over the derivatives too + dy0 = dy1 + return a + +class ParamCurves(inkex.Effect): + def __init__(self): + inkex.Effect.__init__(self) + self.OptionParser.add_option("--t_start", + action="store", type="float", + dest="t_start", default=0.0, + help="Start t-value") + self.OptionParser.add_option("--t_end", + action="store", type="float", + dest="t_end", default=1.0, + help="End t-value") + self.OptionParser.add_option("--times2pi", + action="store", type="inkbool", + dest="times2pi", default=True, + help="Multiply t-range by 2*pi") + self.OptionParser.add_option("--xleft", + action="store", type="float", + dest="xleft", default=-1.0, + help="x-value of rectangle's left") + self.OptionParser.add_option("--xright", + action="store", type="float", + dest="xright", default=1.0, + help="x-value of rectangle's right") + self.OptionParser.add_option("--ybottom", + action="store", type="float", + dest="ybottom", default=-1.0, + help="y-value of rectangle's bottom") + self.OptionParser.add_option("--ytop", + action="store", type="float", + dest="ytop", default=1.0, + help="y-value of rectangle's top") + self.OptionParser.add_option("-s", "--samples", + action="store", type="int", + dest="samples", default=8, + help="Samples") + self.OptionParser.add_option("--fofx", + action="store", type="string", + dest="fofx", default="cos(3*t)", + help="fx(t) for plotting") + self.OptionParser.add_option("--fofy", + action="store", type="string", + dest="fofy", default="sin(5*t)", + help="fy(t) for plotting") + self.OptionParser.add_option("--remove", + action="store", type="inkbool", + dest="remove", default=True, + help="If True, source rectangle is removed") + self.OptionParser.add_option("--isoscale", + action="store", type="inkbool", + dest="isoscale", default=True, + help="If True, isotropic scaling is used") + self.OptionParser.add_option("--drawaxis", + action="store", type="inkbool", + dest="drawaxis", default=True, + help="If True, axis are drawn") + self.OptionParser.add_option("--tab", + action="store", type="string", + dest="tab", default="sampling", + help="The selected UI-tab when OK was pressed") + self.OptionParser.add_option("--paramcurvesuse", + action="store", type="string", + dest="paramcurvesuse", default="", + help="dummy") + self.OptionParser.add_option("--pythonfunctions", + action="store", type="string", + dest="pythonfunctions", default="", + help="dummy") + + def effect(self): + for id, node in self.selected.iteritems(): + if node.tag == inkex.addNS('rect','svg'): + # create new path with basic dimensions of selected rectangle + newpath = inkex.etree.Element(inkex.addNS('path','svg')) + x = float(node.get('x')) + y = float(node.get('y')) + w = float(node.get('width')) + h = float(node.get('height')) + + #copy attributes of rect + s = node.get('style') + if s: + newpath.set('style', s) + + t = node.get('transform') + if t: + newpath.set('transform', t) + + # top and bottom were exchanged + newpath.set('d', simplepath.formatPath( + drawfunction(self.options.t_start, + self.options.t_end, + self.options.xleft, + self.options.xright, + self.options.ybottom, + self.options.ytop, + self.options.samples, + w,h,x,y+h, + self.options.fofx, + self.options.fofy, + self.options.times2pi, + self.options.isoscale, + self.options.drawaxis))) + newpath.set('title', self.options.fofx + " " + self.options.fofy) + + #newpath.set('desc', '!func;' + self.options.fofx + ';' + self.options.fofy + ';' + # + `self.options.t_start` + ';' + # + `self.options.t_end` + ';' + # + `self.options.samples`) + + # add path into SVG structure + node.getparent().append(newpath) + # option wether to remove the rectangle or not. + if self.options.remove: + node.getparent().remove(node) + +if __name__ == '__main__': + e = ParamCurves() + e.affect() + + +# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99