86 lines
3.6 KiB
Python
86 lines
3.6 KiB
Python
#!/usr/bin/env python3
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'''
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Copyright (C) 2015-2015 Carlos Mostek carlosmostek@gmail.com
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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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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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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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'''
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import math
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import inkex
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from lxml import etree
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# This is basically the draw method from the help guides for inkscape
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def draw_SVG_ellipse(rx, ry, cx, cy, parent, start_end=(0,2*math.pi),transform='' ):
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style = { 'stroke' : '#000000',
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'stroke-width' : '1',
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'fill' : 'none' }
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ell_attribs = {'style':str(inkex.Style(style)),
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inkex.addNS('cx','sodipodi') :str(cx),
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inkex.addNS('cy','sodipodi') :str(cy),
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inkex.addNS('rx','sodipodi') :str(rx),
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inkex.addNS('ry','sodipodi') :str(ry),
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inkex.addNS('start','sodipodi') :str(start_end[0]),
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inkex.addNS('end','sodipodi') :str(start_end[1]),
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inkex.addNS('open','sodipodi') :'true', #all ellipse sectors we will draw are open
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inkex.addNS('type','sodipodi') :'arc',
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'transform' :transform
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}
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ell = etree.SubElement(parent, inkex.addNS('path','svg'), ell_attribs )
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# This is the workhorse, it draws the circle based on which node number
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def drawKthCircle(k,firstRadius, lastRadius, numNodes, spreadFactor, parent):
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# Use golden circle phi
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phi = (math.sqrt(5) - 1)/2
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# Calculate the node radius
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growth = lastRadius - firstRadius
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nodeRadius = firstRadius + growth * float(k - 1) / float(numNodes)
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# Calculate X and Y from theta = 2 pi phi k and radius = sqrt(k)
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r = spreadFactor * math.sqrt(k)
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theta = 2 * math.pi * phi * k
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# use simple trig to get cx and cy
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x = r * math.cos(theta)
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y = r * math.sin(theta)
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# Add the px to the size
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nodeRadiusTxt = "%spx" % nodeRadius
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# Draw the node
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draw_SVG_ellipse(nodeRadiusTxt, nodeRadiusTxt , x, y, parent)
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class FibonacciPattern(inkex.EffectExtension):
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def add_arguments(self, pars):
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pars.add_argument("-f", "--FirstRadius", type=int, default="5", help="The radius of the first layer of circles in pixels.")
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pars.add_argument("-l", "--LastRadius", type=int, default="10", help="The radius of the last layer of circles in pixels.")
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pars.add_argument("-n", "--NumberOfNodes", type=int, default="5", help="The number of layers in the fibonacci spiral")
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pars.add_argument("-s", "--SpreadFactor",type=int, default="10", help="This will create a larger spread between the nodes from the center.")
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def effect(self):
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group = self.document.getroot().add(inkex.Group(id="fibonacci-pattern-" + self.svg.get_unique_id("")))
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for k in range(1,self.options.NumberOfNodes):
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drawKthCircle(k,
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self.options.FirstRadius,
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self.options.LastRadius,
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self.options.NumberOfNodes,
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self.options.SpreadFactor,
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group)
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if __name__ == '__main__':
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FibonacciPattern().run() |