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mightyscape-1.1-deprecated/extensions/fablabchemnitz/bobbinlace/polar_grid.py
2021-07-23 02:36:56 +02:00

184 lines
6.7 KiB
Python

#!/usr/bin/env python3
# Copyright 2015 Jo Pol
# 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 3 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, see http://www.gnu.org/licenses/.
from __future__ import division
from math import pi, sin, cos, tan, radians
from lxml import etree
# We will use the inkex module with the predefined
# Effect base class.
import inkex
__author__ = 'Jo Pol'
__credits__ = ['Veronika Irvine','Jo Pol','Mark Shafer']
__license__ = 'GPLv3'
class PolarGrid(inkex.EffectExtension):
def add_arguments(self, pars):
pars.add_argument('-a', '--angle', type=float, default=45, help='grid angle (degrees)')
pars.add_argument('-d', '--dots', type=int, default=180, help='number of dots on a circle')
pars.add_argument('-o', '--outerDiameter', type=float, default=160, help='outer diameter (mm)')
pars.add_argument('-i', '--innerDiameter', type=float, default=100, help='minimum inner diameter (mm)')
pars.add_argument('-f', '--fill', type=inkex.Color, default='-6711040', help='dot color')
pars.add_argument('-A', '--alignment', default='outside', help='exact diameter on [inside|outside]')
pars.add_argument('-s', '--size', type=float, default=0.5, help='dot diameter (mm)')
pars.add_argument('-v', '--variant', default='', help='omit rows to get [|rectangle|hexagon1]')
pars.add_argument('-cu', '--circleDiameterUnits', default = 'mm', help = 'Circle diameter is measured in these units')
pars.add_argument('-du', '--dotUnits', default = 'px', help = 'Dot diameter is measured in these unites')
def group(self, diameter):
"""
Create a group labeled with the diameter
"""
label = 'diameter: {0:.2f} mm'.format(diameter)
attribs = {inkex.addNS('label', 'inkscape'):label}
return etree.SubElement(self.gridContainer, inkex.addNS('g', 'svg'), attribs)
def dots(self, diameter, circleNr, group):
"""
Draw dots on a grid circle
"""
offset = (circleNr % 2) * 0.5
for dotNr in range (0, self.options.dots):
a = (dotNr + offset) * self.alpha
x = (diameter / 2.0) * cos(a)
y = (diameter / 2.0) * sin(a)
attribs = {'style':self.dotStyle, 'cx':str(x * self.circleScale), 'cy':str(y * self.circleScale), 'r':self.dotR}
etree.SubElement(group, inkex.addNS('circle', 'svg'), attribs)
def iterate(self, diameter, circleNr):
"""
Create a group with a ring of dots.
Returns half of the arc length between the dots
which becomes the distance to the next ring.
"""
group = self.group(diameter)
self.dots(diameter, circleNr, group)
self.generatedCircles.append(group)
return diameter * self.change
def generate(self):
"""
Generate rings with dots, either inside out or outside in
"""
circleNr = 0
flag_error = False
minimum = 2 * self.options.size * self.options.dots /pi
if minimum < self.options.innerDiameter:
minimum = self.options.innerDiameter
else:
flag_error = True
if self.options.alignment == 'outside':
diameter = self.options.outerDiameter
while diameter > minimum:
diameter -= self.iterate(diameter, circleNr)
circleNr += 1
else:
diameter = minimum
while diameter < self.options.outerDiameter:
diameter += self.iterate(diameter, circleNr)
circleNr += 1
# Display message
if flag_error:
# Leave message on top
font_height = 8
text_style = { 'font-size': str(font_height),
'font-family': 'sans-serif',
'text-anchor': 'middle',
'text-align': 'center',
'fill': '#000000' }
text_atts = {'style':str(inkex.Style(text_style)),
'x': '0', 'y': '0'}
text = etree.SubElement(self.gridContainer, 'text', text_atts)
text.text = "Dots overlap. inner changed to %4.1f" % (minimum)
def removeGroups(self, start, increment):
"""
Remove complete rings with dots
"""
for i in range(start, len(self.generatedCircles), increment):
self.svg.get_current_layer().remove(self.generatedCircles[i])
def removeDots(self, i, offset, step):
"""
Remove dots from one circle
"""
group = self.generatedCircles[i]
dots = list(group)
start = len(dots) - 1 - offset
for j in range(start, -1, 0-step):
group.remove(dots[j])
def computations(self, angle):
self.alpha = radians(360.0 / self.options.dots)
correction = pi / (4 * self.options.dots)
correction *= tan(angle*0.93)
self.change = tan(angle - correction) * pi / self.options.dots
def effect(self):
"""
Effect behaviour.
Overrides base class' method and draws something.
"""
# constants
self.dotStyle = str(inkex.Style({'fill': self.options.fill.to_rgb(),'stroke':'none'}))
self.dotScale = self.svg.unittouu("1" + self.options.dotUnits)
self.dotR = str(self.options.size * (self.dotScale/2))
self.circleScale = self.svg.unittouu("1" + self.options.circleDiameterUnits)
self.computations(radians(self.options.angle))
# processing variables
self.generatedCircles = []
self.gridContainer = self.svg.get_current_layer()
self.generate()
if self.options.variant == 'rectangle':
self.removeGroups(1, 2)
elif self.options.variant == 'hexagon1':
self.removeGroups(0, 3)
elif self.options.variant == 'hexagon2' or self.options.variant == 'snow2':
for i in range(0, len(self.generatedCircles), 1):
self.removeDots(i, (((i%2)+1)*2)%3, 3)
elif self.options.variant == 'hexagon3':
for i in range(0, len(self.generatedCircles), 2):
self.removeDots(i, (i//2+1)%2, 2)
elif self.options.variant == 'hexagon4':
self.removeGroups(0, 4)
elif self.options.variant == 'hexagon5' or self.options.variant == 'snow1':
for i in range(0, len(self.generatedCircles), 2):
self.removeDots(i, 1, 2)
self.dotStyle = str(inkex.Style({'fill': 'none','stroke':self.options.fill.to_rgb(),'stroke-width':0.7}))
self.dotR = str((((self.options.innerDiameter * pi) / self.options.dots) / 2) * self.dotScale)
self.generatedCircles = []
if self.options.variant == 'snow2':
self.options.dots = self.options.dots // 3
self.computations(radians(self.options.angle))
self.generate()
elif self.options.variant == 'snow1':
self.generate()
self.removeGroups(1, 2)
for i in range(0, len(self.generatedCircles), 2):
self.removeDots(i, i%4, 2)
for i in range(0, len(self.generatedCircles), 2):
self.removeDots(i, (i+1)%2, 2)
for i in range(2, len(self.generatedCircles), 4):
self.removeDots(i, 0, self.options.dots)
if __name__ == '__main__':
PolarGrid().run()