diff options
Diffstat (limited to 'share/extensions/spirograph.py')
| -rw-r--r-- | share/extensions/spirograph.py | 43 |
1 files changed, 22 insertions, 21 deletions
diff --git a/share/extensions/spirograph.py b/share/extensions/spirograph.py index 8ed297849..3ac356510 100644 --- a/share/extensions/spirograph.py +++ b/share/extensions/spirograph.py @@ -1,4 +1,4 @@ -#!/usr/bin/env python +#! /usr/bin/env python ''' Copyright (C) 2007 Joel Holdsworth joel@airwebreathe.org.uk @@ -22,31 +22,32 @@ class Spirograph(inkex.Effect): def __init__(self): inkex.Effect.__init__(self) self.OptionParser.add_option("-R", "--primaryr", - action="store", type="float", + action="store", type="float", dest="primaryr", default=60.0, help="The radius of the outer gear") self.OptionParser.add_option("-r", "--secondaryr", - action="store", type="float", + action="store", type="float", dest="secondaryr", default=100.0, help="The radius of the inner gear") self.OptionParser.add_option("-d", "--penr", - action="store", type="float", + action="store", type="float", dest="penr", default=50.0, help="The distance of the pen from the inner gear") self.OptionParser.add_option("-p", "--gearplacement", - action="store", type="string", + action="store", type="string", dest="gearplacement", default=50.0, help="Selects whether the gear is inside or outside the ring") self.OptionParser.add_option("-a", "--rotation", - action="store", type="float", + action="store", type="float", dest="rotation", default=0.0, - help="The number of degrees to rotate the image by") + help="The number of degrees to rotate the image by") self.OptionParser.add_option("-q", "--quality", - action="store", type="int", + action="store", type="int", dest="quality", default=16, - help="The quality of the calculated output") + help="The quality of the calculated output") + def effect(self): - + if self.options.secondaryr == 0: return if self.options.quality == 0: @@ -58,42 +59,42 @@ class Spirograph(inkex.Effect): else: a = self.options.primaryr - self.options.secondaryr flip = 1 - + ratio = a / self.options.secondaryr if ratio == 0: return scale = 2 * math.pi / (ratio * self.options.quality) - + rotation = - math.pi * self.options.rotation / 180; - + new = inkex.etree.Element(inkex.addNS('path','svg')) s = { 'stroke': '#000000', 'fill': 'none' } new.set('style', simplestyle.formatStyle(s)) - + pathString = '' maxPointCount = 1000 - + for i in range(maxPointCount): theta = i * scale - + x = a * math.cos(theta + rotation) + \ self.options.penr * math.cos(ratio * theta + rotation) * flip + \ self.view_center[0] y = a * math.sin(theta + rotation) - \ self.options.penr * math.sin(ratio * theta + rotation) + \ self.view_center[1] - + dx = (-a * math.sin(theta + rotation) - \ ratio * self.options.penr * math.sin(ratio * theta + rotation) * flip) * scale / 3 dy = (a * math.cos(theta + rotation) - \ ratio * self.options.penr * math.cos(ratio * theta + rotation)) * scale / 3 - + if i <= 0: pathString += 'M ' + str(x) + ',' + str(y) + ' C ' + str(x + dx) + ',' + str(y + dy) + ' ' else: pathString += str(x - dx) + ',' + str(y - dy) + ' ' + str(x) + ',' + str(y) - + if math.fmod(i / ratio, self.options.quality) == 0 and i % self.options.quality == 0: pathString += 'Z' break @@ -102,8 +103,8 @@ class Spirograph(inkex.Effect): pass # we reached the allowed maximum of points, stop here else: pathString += ' C ' + str(x + dx) + ',' + str(y + dy) + ' ' - - + + new.set('d', pathString) self.current_layer.append(new) |