diff options
Diffstat (limited to 'share/extensions/funcplot.py')
| -rw-r--r-- | share/extensions/funcplot.py | 266 |
1 files changed, 42 insertions, 224 deletions
diff --git a/share/extensions/funcplot.py b/share/extensions/funcplot.py index 9948478a1..a093a3ff2 100644 --- a/share/extensions/funcplot.py +++ b/share/extensions/funcplot.py @@ -1,224 +1,42 @@ -#!/usr/bin/env python
-'''
-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 a modified version of wavy.py by Aaron Spike.
- * 22-Dec-2006: Wiora : Added axis and isotropic scaling
-
-'''
-import inkex, simplepath, simplestyle
-from math import *
-from random import *
-
-def drawfunction(xstart, xend, ybottom, ytop, samples, width, height, left, bottom,
- fx = "sin(x)", fpx = "cos(x)", fponum = True, times2pi = False, isoscale = True, drawaxis = True):
-
- if times2pi == True:
- xstart = 2 * pi * xstart
- xend = 2 * pi * xend
-
- # 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 = 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<scalex:
- # compute zero location
- xzero = coordx(0)
- # set scale
- scalex = scaley
- # correct x-offset
- xstart = (left-xzero)/scalex
- xend = (left+width-xzero)/scalex
- else :
- # compute zero location
- yzero = coordy(0)
- # set scale
- scaley = scalex
- # correct x-offset
- ybottom = (yzero-bottom)/scaley
- ytop = (bottom+height-yzero)/scaley
-
- # functions specified by the user
- if fx != "":
- f = eval('lambda x: ' + fx)
- if fpx != "":
- fp = eval('lambda x: ' + fpx)
-
- # step is the distance between nodes on x
- step = (xend - xstart) / (samples-1)
- third = step / 3.0
-
- a = [] # path array
- # add axis
- if drawaxis :
- # check for visibility of x-axis
- if ybottom<=0 and ytop>=0:
- # xaxis
- a.append(['M ',[left, coordy(0)]])
- a.append([' l ',[width, 0]])
- # check for visibility of y-axis
- if xstart<=0 and xend>=0:
- # xaxis
- a.append([' M ',[coordx(0),bottom]])
- a.append([' l ',[0, -height]])
-
- # 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)
-
- # Start curve
- 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("--times2pi",
- action="store", type="inkbool",
- dest="times2pi", default=True,
- help="Multiply x-range by 2*pi")
- 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("--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("--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
-
- # top and bottom where exchanhged
- 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+h,
- self.options.fofx,
- self.options.fpofx,
- self.options.fponum,
- self.options.times2pi,
- self.options.isoscale,
- self.options.drawaxis)))
- 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)
- # option wether to remove the rectangle or not.
- if self.options.remove:
- node.parentNode.removeChild(node)
-
-e = FuncPlot()
-e.affect()
+<inkscape-extension>
+ <_name>Function Plotter</_name>
+ <id>org.inkscape.effect.funcplot</id>
+ <dependency type="executable" location="extensions">funcplot.py</dependency>
+ <dependency type="executable" location="extensions">inkex.py</dependency>
+ <param name="tab" type="notebook">
+ <page name="sampling" _gui-text="Range and Sampling">
+ <param name="xstart" type="float" min="-1000.0" max="1000.0" _gui-text="Start x-value">0.0</param>
+ <param name="xend" type="float" min="-1000.0" max="1000.0" _gui-text="End x-value">1.0</param>
+ <param name="times2pi" type="boolean" _gui-text="Multiply x-range by 2*pi">false</param>
+ <param name="ybottom" type="float" min="-1000.0" max="1000.0" _gui-text="y-value of rectangle's bottom">0.0</param>
+ <param name="ytop" type="float" min="-1000.0" max="1000.0" _gui-text="y-value of rectangle's top">1.0</param>
+ <param name="samples" type="int" min="2" max="1000" _gui-text="Samples">8</param>
+ <param name="isoscale" type="boolean" _gui-text="Isotropic scaling (uses smallest: width/xrange or height/yrange)">false</param>
+ </page>
+ <page name="desc" _gui-text="Help">
+ <_param name="pythonfunctions" type="description">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); 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. </_param>
+ </page>
+ </param>
+ <param name="fofx" type="string" _gui-text="Function">exp(-x*x)</param>
+ <param name="fponum" type="boolean" _gui-text="Calculate first derivative numerically">true</param>
+ <param name="fpofx" type="string" _gui-text="First derivative">x</param>
+ <param name="remove" type="boolean" _gui-text="Remove rectangle">true</param>
+ <param name="drawaxis" type="boolean" _gui-text="Draw Axes">false</param>
+ <effect>
+ <object-type>rect</object-type>
+ <effects-menu>
+ <submenu _name="Render"/>
+ </effects-menu>
+ </effect>
+ <script>
+ <command reldir="extensions" interpreter="python">funcplot.py</command>
+ </script>
+</inkscape-extension>
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