145 lines
5.4 KiB
Python
145 lines
5.4 KiB
Python
#!/usr/bin/env python3
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"""
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X-agram
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Create n-pointed star polygons (pentagram, hexagram, etc)
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"""
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import inkex
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from math import *
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from lxml import etree
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def addPathCommand(a, cmd):
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for x in cmd:
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a.append(str(x))
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class XAgram(inkex.EffectExtension):
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def add_arguments(self, pars):
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pars.add_argument('--tab')
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pars.add_argument('--points', type=int, default=5, help='Number of points (or sides)')
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pars.add_argument('--skip', type=int, default=2, help='Vertex increment when connecting points')
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pars.add_argument('--rotate', type=float, default=0, help='Rotation angle (clockwise, in degrees)')
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pars.add_argument('--inner_circle', type=inkex.Boolean, default=False, help='Connect points via inner circle')
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pars.add_argument('--show_inner_circle', type=inkex.Boolean, default=True, help='Show inner circle')
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pars.add_argument('--inner_ratio', type=int, default=50, help='Inner radius percentage (inner radius as a percentage of the outer radius)')
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def effect(self):
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layer = self.svg.get_current_layer();
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if len(self.svg.selected) == 0:
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inkex.errormsg('Please select a circle or ellipse.')
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exit()
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numValid = 0
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for id, obj in self.svg.selected.items():
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cx,cy, rx,ry = 0,0, 0,0
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style = ''
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isValid = False
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if obj.tag == inkex.addNS('circle','svg'):
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isValid = True
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cx = float(obj.get('cx'))
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cy = float(obj.get('cy'))
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rx = float(obj.get('r'))
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ry = rx
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elif obj.tag == inkex.addNS('ellipse', 'svg'):
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isValid = True
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cx = float(obj.get('cx'))
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cy = float(obj.get('cy'))
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rx = float(obj.get('rx'))
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ry = float(obj.get('ry'))
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elif obj.tag == inkex.addNS('path', 'svg'):
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if obj.get(inkex.addNS('type', 'sodipodi')) == 'arc':
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isValid = True
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cx = float(obj.get(inkex.addNS('cx', 'sodipodi')))
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cy = float(obj.get(inkex.addNS('cy', 'sodipodi')))
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rx = float(obj.get(inkex.addNS('rx', 'sodipodi')))
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ry = float(obj.get(inkex.addNS('ry', 'sodipodi')))
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if not isValid:
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continue;
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numValid += 1
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style = obj.get('style')
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transform = obj.get('transform')
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isEllipse = False
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if rx != ry:
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isEllipse = True
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sides = self.options.points
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skip = self.options.skip
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rotate = self.options.rotate
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useInnerCircle = self.options.inner_circle
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showInnerCircle = self.options.show_inner_circle
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innerRatio = float(self.options.inner_ratio) / 100.0
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if useInnerCircle and showInnerCircle:
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if not isEllipse:
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cin = etree.SubElement(layer, inkex.addNS('circle','svg'))
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cin.set('r', str(rx * innerRatio))
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else:
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cin = etree.SubElement(layer, inkex.addNS('ellipse','svg'))
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cin.set('rx', str(rx * innerRatio))
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cin.set('ry', str(ry * innerRatio))
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cin.set('cx', str(cx))
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cin.set('cy', str(cy))
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cin.set('style', style)
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if transform:
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cin.set('transform', transform)
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tau = 2*pi
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origin = -(tau / 4) + (rotate * pi / 180)
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out_pts = []
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in_pts = []
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for i in range(sides):
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# Outer points (on outer circle)
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theta = (i * (tau / sides))
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px = cx + rx * cos(origin + theta)
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py = cy + ry * sin(origin + theta)
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out_pts.append([px, py])
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# Inner points (on inner circle)
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theta = ((i + (skip / 2.0)) * (tau / sides))
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px = cx + rx * innerRatio * cos(origin + theta)
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py = cy + ry * innerRatio * sin(origin + theta)
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in_pts.append([px, py])
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pts = []
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pt_done = {}
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for i in range(sides):
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if i in pt_done:
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continue;
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p1 = out_pts[i]
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addPathCommand(pts, ['M', p1[0], p1[1]])
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pt_done[i] = True
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start_index = i
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curr = start_index
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next = (curr + skip) % sides
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while next != start_index:
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p = out_pts[next]
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pt_done[next] = True
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if useInnerCircle:
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addPathCommand(pts, ['L', in_pts[curr][0], in_pts[curr][1]])
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addPathCommand(pts, ['L', p[0], p[1]])
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curr = next
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next = (curr + skip) % sides
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if useInnerCircle:
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addPathCommand(pts, ['L', in_pts[curr][0], in_pts[curr][1]])
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addPathCommand(pts, ['z'])
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# Create star polygon as a single path.
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l1 = etree.SubElement(layer, inkex.addNS('path','svg'))
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l1.set('style', style)
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if transform:
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l1.set('transform', transform)
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l1.set('d', ' '.join(pts))
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if numValid == 0:
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inkex.errormsg('Selection must contain a circle or ellipse.')
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if __name__ == '__main__':
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XAgram().run()
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