From 00b0f109e4e04891be218ee0bfbddaabbe2b85ae Mon Sep 17 00:00:00 2001 From: johanengelen Date: Thu, 14 Sep 2006 23:07:51 +0000 Subject: [PATCH] Renamed effect and made an extended "Function Plotter". Kind of an excuse to showcase the 'notebook' parameter type i added. --- share/extensions/funcplot.inx | 34 +++++++ share/extensions/funcplot.py | 163 ++++++++++++++++++++++++++++++++++ share/extensions/wavy.inx | 2 +- 3 files changed, 198 insertions(+), 1 deletion(-) create mode 100644 share/extensions/funcplot.inx create mode 100644 share/extensions/funcplot.py diff --git a/share/extensions/funcplot.inx b/share/extensions/funcplot.inx new file mode 100644 index 000000000..cd813f077 --- /dev/null +++ b/share/extensions/funcplot.inx @@ -0,0 +1,34 @@ + + <_name>Function Plotter + org.inkscape.effect.funcplot + funcplot.py + inkex.py + + + 0.0 + 1.0 + 0.0 + 1.0 + 8 + + + The following functions are available: +(the available functions are the standard python math functions) +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); cos(x); hypot(x,y); sin(x); tan(x); degrees(x); radians(x); cosh(x); sinh(x); tanh(x). + +The constants pi and e are also available. + + + exp(-x*x) + true + + + rect + + + + + + diff --git a/share/extensions/funcplot.py b/share/extensions/funcplot.py new file mode 100644 index 000000000..f555bb612 --- /dev/null +++ b/share/extensions/funcplot.py @@ -0,0 +1,163 @@ +#!/usr/bin/env python +''' +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 + +This program is a modified version of wavy.py by Aaron Spike. + +''' +import inkex, simplepath, simplestyle +from math import * +from random import * + +def drawfunction(xstart, xend, ybottom, ytop, samples, width, height, left, top, + fx = "sin(x)", fpx = "cos(x)", fponum = True): + + # step is the distance between nodes on x + step = (xend - xstart) / (samples-1) + third = step / 3.0 + + # coords and scales based on the source rect + scalex = width / (xend - xstart) + xoff = left + coordx = lambda x: (x - xstart) * scalex + xoff #convert x-value to coordinate + scaley = height / (ytop - ybottom) + yoff = top + coordy = lambda y: (ytop-y) * scaley + yoff #convert y-value to coordinate + + # functions specified by the user + if fx != "": + f = eval('lambda x: ' + fx) + if fpx != "": + fp = eval('lambda x: ' + fpx) + + # initialize function and derivative for 0; + # they are carried over from one iteration to the next, to avoid extra function calculations + y0 = f(xstart) + if fponum == True: # numerical derivative, using 0.001*step as the small differential + d0 = (f(xstart + 0.001*step) - y0)/(0.001*step) + else: # derivative given by the user + d0 = fp(xstart) + + a = [] # path array + a.append(['M',[coordx(xstart), coordy(y0)]]) # initial moveto + + for i in range(int(samples-1)): + x = (i+1) * step + xstart + y1 = f(x) + if fponum == True: # numerical derivative + d1 = (y1 - f(x - 0.001*step))/(0.001*step) + else: # derivative given by the user + d1 = fp(x) + # create curve + a.append(['C',[coordx(x - step + third), coordy(y0 + (d0 * third)), + coordx(x - third), coordy(y1 - (d1 * third)), + coordx(x), coordy(y1)]]) + y0 = y1 # next segment's y0 is this segment's y1 + d0 = d1 # we assume the function is smooth everywhere, so carry over the derivative too + + return a + +class FuncPlot(inkex.Effect): + def __init__(self): + inkex.Effect.__init__(self) + self.OptionParser.add_option("--xstart", + action="store", type="float", + dest="xstart", default=0.0, + help="Start x-value") + self.OptionParser.add_option("--xend", + action="store", type="float", + dest="xend", default=1.0, + help="End x-value") + 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="sin(x)", + help="f(x) for plotting") + self.OptionParser.add_option("--fponum", + action="store", type="inkbool", + dest="fponum", default=True, + help="Calculate the first derivative numerically") + self.OptionParser.add_option("--fpofx", + action="store", type="string", + dest="fpofx", default="cos(x)", + help="f'(x) for plotting") + 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("--pythonfunctions", + action="store", type="string", + dest="pythonfunctions", default="", + help="dummy") + + def effect(self): + for id, node in self.selected.iteritems(): + if node.tagName == 'rect': + # create new path with basic dimensions of selected rectangle + newpath = self.document.createElement('svg:path') + x = float(node.attributes.getNamedItem('x').value) + y = float(node.attributes.getNamedItem('y').value) + w = float(node.attributes.getNamedItem('width').value) + h = float(node.attributes.getNamedItem('height').value) + + #copy attributes of rect + s = node.attributes.getNamedItem('style').value + newpath.setAttribute('style', s) + try: + t = node.attributes.getNamedItem('transform').value + newpath.setAttribute('transform', t) + except AttributeError: + pass + + newpath.setAttribute('d', simplepath.formatPath( + drawfunction(self.options.xstart, + self.options.xend, + self.options.ybottom, + self.options.ytop, + self.options.samples, + w,h,x,y, + self.options.fofx, + self.options.fpofx, + self.options.fponum))) + newpath.setAttribute('title', self.options.fofx) + + #newpath.setAttribute('desc', '!func;' + self.options.fofx + ';' + # + self.options.fpofx + ';' + # + `self.options.fponum` + ';' + # + `self.options.xstart` + ';' + # + `self.options.xend` + ';' + # + `self.options.samples`) + + # add path into SVG structure + node.parentNode.appendChild(newpath) + # TODO: make an option wether to remove the rectangle or not. + node.parentNode.removeChild(node) + +e = FuncPlot() +e.affect() \ No newline at end of file diff --git a/share/extensions/wavy.inx b/share/extensions/wavy.inx index 5d9a2365a..2dd34d9b0 100644 --- a/share/extensions/wavy.inx +++ b/share/extensions/wavy.inx @@ -1,5 +1,5 @@ - <_name>Function Plotter + <_name>Wave Plotter org.ekips.filter.wavy wavy.py inkex.py -- 2.30.2