130 lines
5.4 KiB
Python
130 lines
5.4 KiB
Python
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#! /usr/bin/env python
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# -*- coding: utf-8 -*-
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import numpy as np
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from math import pi, sin, cos
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import inkex
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from Path import Path
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from Pattern import Pattern
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# Select name of class, inherits from Pattern
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# TODO:
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# 1) Implement __init__ method to get all custom options and then call Pattern's __init__
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# 2) Implement generate_path_tree to define all of the desired strokes
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class SupportRing(Pattern):
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def __init__(self):
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""" Constructor
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"""
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Pattern.__init__(self) # Must be called in order to parse common options
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# save all custom parameters defined on .inx file
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self.add_argument('--sides', type=self.int, default=3)
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self.add_argument('--radius_external', type=self.float, default=10.0)
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self.add_argument('--inverted', type=self.bool, default=False)
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self.add_argument('--single_stroke', type=self.bool, default=True)
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self.add_argument('--radius_ratio', type=self.float, default=0.5)
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self.add_argument('--radius_type', type=self.str, default='polygonal')
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self.add_argument('--radius_draw', type=self.bool, default=True)
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self.add_argument('--connector_length', type=self.float, default=3.0)
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self.add_argument('--connector_thickness', type=self.float, default=3.0)
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self.add_argument('--head_length', type=self.float, default=1.0)
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self.add_argument('--head_thickness', type=self.float, default=1.0)
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self.add_argument('--pattern', type=self.str, default='support ring')
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def generate_path_tree(self):
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""" Specialized path generation for your origami pattern
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"""
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# retrieve conversion factor for selected unit
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unit_factor = self.calc_unit_factor()
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# retrieve saved parameters, and apply unit factor where needed
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inverted = self.options.inverted
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sign = -1 if inverted else 1
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single_stroke = self.options.single_stroke
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radius_external = self.options.radius_external * unit_factor
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radius_type = self.options.radius_type
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radius_ratio = self.options.radius_ratio
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radius_internal = radius_external / radius_ratio if inverted else radius_external * radius_ratio
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# dradius = abs(radius_external-radius_internal)
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sides = self.options.sides
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connector_length = self.options.connector_length * unit_factor
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connector_thickness = self.options.connector_thickness * unit_factor
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head_length = self.options.head_length * unit_factor
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head_thickness = self.options.head_thickness * unit_factor
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angle = pi / sides
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length_external = 2 * radius_external * sin(angle)
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length_internal = length_external / radius_ratio if inverted else length_external * radius_ratio
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external_points = [(-length_external/2, 0),
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(-connector_thickness / 2, 0),
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(-connector_thickness / 2, -connector_length*sign),
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(-connector_thickness / 2 - head_thickness / 2, -connector_length*sign),
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(-connector_thickness / 2, -(connector_length + head_length)*sign),
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(0, -(connector_length + head_length)*sign),
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(+connector_thickness / 2, -(connector_length + head_length)*sign),
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(+connector_thickness / 2 + head_thickness / 2, -connector_length*sign),
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(+connector_thickness / 2, -connector_length*sign),
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(+connector_thickness / 2, 0),
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(length_external/2, 0)]
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internal_points = [(0, 0), (length_internal, 0)]
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external_lines_0 = Path(external_points, 'm') + (length_external / 2, 0)
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external_lines = [external_lines_0]
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for i in range(sides-1):
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x, y = external_lines[-1].points[-1]
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external_lines.append(external_lines_0*(1, 2*(i+1)*angle) + (x, y))
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if single_stroke:
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external_lines = Path(Path.get_points(external_lines), 'm')
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self.path_tree = [external_lines]
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if self.options.radius_draw == True:
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# center point of main strokes
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outer_average = Path.get_average_point(external_lines)
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if radius_type == 'polygonal':
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internal_lines_0 = Path(internal_points, 'm')
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internal_lines = [internal_lines_0]
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for i in range(sides - 1):
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x, y = internal_lines[-1].points[-1]
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internal_lines.append(internal_lines_0*(1, 2*(i+1)*angle) + (x, y))
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# move to center
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inner_average = Path.get_average_point(internal_lines)
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delta = ((outer_average[0] - inner_average[0]),
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(outer_average[1] - inner_average[1]))
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if single_stroke:
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internal_lines = Path(Path.get_points(internal_lines), 'm')
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internal_lines = Path.list_add(internal_lines, delta)
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elif radius_type == 'circular':
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internal_lines = Path(outer_average, radius=radius_internal, style='m')
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self.path_tree.append(internal_lines)
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# Main function, creates an instance of the Class and calls self.draw() to draw the origami on inkscape
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# self.draw() is either a call to inkex.affect() or to svg.run(), depending on python version
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if __name__ == '__main__':
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e = SupportRing() # remember to put the name of your Class here!
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e.draw()
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