101 lines
3.9 KiB
Python
101 lines
3.9 KiB
Python
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#!/usr/bin/env python3
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import inkex
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import apolloniangasket_func
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from lxml import etree
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__version__ = '0.0'
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def cplxs2pts(zs):
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tt = []
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for z in zs:
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tt.extend([z.real,z.imag])
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return tt
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def draw_SVG_circle(parent, r, cx, cy, name):
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" structure an SVG circle entity under parent "
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circ_attribs = { 'cx': str(cx), 'cy': str(cy),
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'r': str(r),
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inkex.addNS('label','inkscape'): name}
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circle = etree.SubElement(parent, inkex.addNS('circle','svg'), circ_attribs)
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def draw_SVG_circleAsPath(parent, r, cx, cy, name):
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circ_attribs = {
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"d": "M {:0.6f}, {:0.6f} a {:0.6f},{:0.6f} 0 1,0 {:0.6f},0 a {:0.6f},{:0.6f} 0 1,0 {:0.6f},0".format(
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cx - r, cy, r, r, 2*r, r, r, -2*r),
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inkex.addNS('label','inkscape'): name}
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circle = etree.SubElement(parent, inkex.addNS('path','svg'), circ_attribs)
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class Gasket(inkex.EffectExtension): # choose a better name
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def add_arguments(self, pars):
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pars.add_argument("--active_tab")
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pars.add_argument("--depth",type=int, default=3)
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pars.add_argument("--c1", type=float, default=2.0)
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pars.add_argument("--c2", type=float, default=3.0)
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pars.add_argument("--c3", type=float, default=3.0)
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pars.add_argument("--shrink", type=inkex.Boolean, default=True)
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pars.add_argument("--as_paths", type=inkex.Boolean, default=True)
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def calc_unit_factor(self):
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unit_factor = self.svg.unittouu(str(1.0) + self.options.units)
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return unit_factor
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### -------------------------------------------------------------------
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### Main function and is called when the extension is run.
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def effect(self):
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#set up path styles
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path_stroke = '#DD0000' # take color from tab3
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path_fill = 'none' # no fill - just a line
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path_stroke_width = self.svg.unittouu(str(0.1) + "mm")
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page_id = self.options.active_tab # sometimes wrong the very first time
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style_curve = { 'stroke': path_stroke,
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'fill': 'none',
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'stroke-width': path_stroke_width }
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# This finds center of current view in inkscape
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t = 'translate(%s,%s)' % (self.svg.namedview.center[0], self.svg.namedview.center[1])
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# add a group to the document's current layer
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#all the circles inherit style from this group
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g_attribs = { inkex.addNS('label','inkscape'): 'zengon' + "_%d"%(self.options.depth),
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inkex.addNS('transform-center-x','inkscape'): str(0),
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inkex.addNS('transform-center-y','inkscape'): str(0),
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'transform': t,
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'style' : str(inkex.Style((style_curve))),
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'info':'N: '}
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topgroup = etree.SubElement(self.svg.get_current_layer(), 'g', g_attribs)
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circles = apolloniangasket_func.main(c1=self.options.c1,
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c2=self.options.c2,
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c3=self.options.c3,
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depth=self.options.depth)
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#shrink the circles so they don't touch
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#useful for laser cutting
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if self.options.shrink:
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circles = circles[1:]
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for cc in circles:
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cc.r = abs(cc.r)
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if cc.r >.5:
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cc.r -= .1
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else:
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cc.r *= .9
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scale_factor = 200
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for c in circles:
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cx, cy, r = c.m.real, c.m.imag, abs(c.r)
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#rescale and add circle to document
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cx, cy, r = scale_factor * cx , scale_factor * cy, scale_factor * r
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if self.options.as_paths is False:
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draw_SVG_circle(topgroup, r, cx, cy, 'apollian')
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else:
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draw_SVG_circleAsPath(topgroup, r, cx, cy, 'apollian')
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if __name__ == '__main__':
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Gasket().run()
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