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