450 lines
15 KiB
Python
450 lines
15 KiB
Python
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#!/usr/bin/env python3
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import inkex
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cut_colour = '#ff0000'
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engrave_colour = '#0000ff'
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class Generator(object):
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"""A generic generator, subclassed for each different lattice style."""
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def __init__(self, x, y, width, height, stroke_width, svg, e_length, p_spacing):
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self.x = x
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self.y = y
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self.width = width
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self.height = height
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self.stroke_width = stroke_width
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self.svg = svg
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self.canvas = self.svg.get_current_layer()
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self.e_length = e_length
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self.e_height = 0 # Provided by sub-classes.
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self.p_spacing = p_spacing
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self.fixed_commands = ""
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def draw_one(self, x, y):
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return "M %f,%f %s" % (x, y, self.fixed_commands)
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def parameter_text(self):
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return "length: %.f spacing: %.1f" % (
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self.e_length,
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self.p_spacing,
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)
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def draw_swatch(self):
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border = self.canvas.add(inkex.PathElement())
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# Curve radius
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cr = self.svg.unittouu('10mm')
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# Swatch padding
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sp = self.svg.unittouu('30mm')
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# Handle length
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hl = cr/2
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path_command = (
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'm %f,%f l %f,%f c %f,%f %f,%f %f,%f'
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'l %f,%f c %f,%f %f,%f %f,%f '
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'l %f,%f c %f,%f %f,%f %f,%f '
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'l %f,%f c %f,%f %f,%f %f,%f ') % (
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cr, 0,
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self.width - 2*cr, 0,
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hl, 0,
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cr, cr-hl,
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cr, cr,
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0, self.height - 2*cr + 1.5*sp,
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0, cr/2,
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0-cr+hl, cr,
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0-cr, cr,
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0-self.width + 2*cr, 0,
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0-hl, 0,
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0-cr, 0-cr+hl,
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0-cr, 0-cr,
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0, 0-self.height - 1.5*sp + 2*cr,
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0, 0-hl,
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cr-hl, 0-cr,
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cr, 0-cr
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)
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style = {
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"stroke": cut_colour,
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"stroke-width": str(self.stroke_width),
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"fill": "none",
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}
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border.update(**{"style": style, "inkscape:label": "lattice_border", "d": path_command})
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c = self.canvas.add(inkex.Circle(
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style=str(inkex.Style(style)),
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cx=str(cr),
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cy=str(cr),
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r=str(self.svg.unittouu('4mm'))))
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self.y += sp
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text_style = {
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'fill': engrave_colour,
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'font-size': '9px',
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'font-family': 'sans-serif',
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'text-anchor': 'middle',
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'text-align': 'center',
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}
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text = self.canvas.add(
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inkex.TextElement(
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style=str(inkex.Style(text_style)),
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x=str(self.x + self.width/2),
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y=str(self.y - sp/2)))
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text.text = "Style: %s" % self.name
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text_style['font-size'] = "3px"
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text = self.canvas.add(
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inkex.TextElement(
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style=str(inkex.Style(text_style)),
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x=str(self.x + self.width/2),
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y=str(self.y - sp/4)))
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text.text = self.parameter_text()
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text = self.canvas.add(
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inkex.TextElement(
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style=str(inkex.Style(text_style)),
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x=str(self.x + self.width/2),
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y=str(self.y +self.height + sp/4)))
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text.text = "https://github.com/buxtronix/living-hinge"
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def generate(self, swatch):
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if swatch:
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self.draw_swatch()
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# Round width/height to integer number of patterns.
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self.e_length = self.width / max(round(self.width / self.e_length), 1.0)
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self.e_height = self.height / max(round(self.height / self.e_height), 1.0)
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self.prerender()
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style = {
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"stroke": cut_colour,
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"stroke-width": str(self.stroke_width),
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"fill": "none",
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}
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path_command = ""
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y = self.y
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while y < self.y + self.height:
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x = self.x
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while x < self.x + self.width:
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path_command = "%s %s " % (path_command, self.draw_one(x, y))
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x += self.e_length
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y += self.e_height
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link = self.canvas.add(inkex.PathElement())
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link.update(**{"style": style, "inkscape:label": "lattice", "d": path_command})
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link.description("%s hinge %s" % (self.name, self.parameter_text()))
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class StraightLatticeGenerator(Generator):
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def __init__(self, *args, **kwargs):
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super(StraightLatticeGenerator, self).__init__(*args)
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self.link_gap = kwargs['link_gap']
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self.e_height = 2 * self.p_spacing
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self.name = "straight"
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def prerender(self):
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self.e_height = 2 * self.p_spacing
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w = self.e_length
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lg = self.link_gap
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if lg < 0.1:
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# Single line for 0 height gap.
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self.fixed_commands = " m %f,%f h %f m %f,%f h %f m %f,%f h %f" % (
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0, self.e_height / 2,
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w * 2 / 5,
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0 - w / 5, 0 - self.e_height / 2,
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w * 3 / 5,
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0 - w / 5, self.e_height / 2,
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w * 2 / 5,
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)
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else:
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self.fixed_commands = (
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" m %f,%f h %f v %f h %f"
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" m %f,%f h %f v %f h %f v %f"
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" m %f,%f h %f v %f h %f "
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) % (
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0,
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self.e_height / 2,
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w * 2 / 5,
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lg,
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0 - w * 2 / 5,
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w / 8,
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0 - lg - self.e_height / 2,
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w * 3 / 4,
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lg,
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0 - w * 3 / 4,
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0 - lg,
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w * 7 / 8,
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lg + self.e_height / 2,
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0 - w * 2 / 5,
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0 - lg,
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w * 2 / 5,
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)
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def parameter_text(self):
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text = super(StraightLatticeGenerator, self).parameter_text()
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return "%s element_height: %.1f" % (text, self.link_gap)
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class DiamondLatticeGenerator(Generator):
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def __init__(self, *args, **kwargs):
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super(DiamondLatticeGenerator, self).__init__(*args)
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self.e_height = self.p_spacing
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self.diamond_curve = kwargs['diamond_curve']
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self.name = "diamond"
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def prerender(self):
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h = self.e_height
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w = self.e_length
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# Diamond curve
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dc = 0-self.diamond_curve
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# Horiz handle length.
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hhl = abs(dc * w * 0.2)
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# Endpoint horiz handle length
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ehhl = hhl if dc > 0 else 0
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# Vert handle length
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vhl = abs(dc * h / 8) if dc < 0 else 0
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# Left
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self.fixed_commands = " m %f,%f c %f,%f %f,%f %f,%f c %f,%f %f,%f %f,%f " % (
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0, h / 4,
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hhl, 0,
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w * 0.4 - ehhl, h / 4 - vhl,
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w * 0.4, h / 4,
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0 - ehhl, vhl,
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0 - (w * 0.4 - hhl), h / 4,
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0 - w * 0.4, h / 4,
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)
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# Bottom
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self.fixed_commands = "%s m %f,%f c %f,%f %f,%f %f,%f s %f,%f %f,%f " % (
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self.fixed_commands,
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w * 0.1, h / 4,
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ehhl, 0 - vhl,
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w * 0.4 - hhl, 0 - h / 4,
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w * 0.4, 0 - h / 4,
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w * 0.4 - ehhl, h / 4 - vhl,
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w * 0.4, h / 4,
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)
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# Top
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self.fixed_commands = "%s m %f,%f c %f,%f %f,%f %f,%f s %f,%f %f,%f " % (
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self.fixed_commands,
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0 - w * 0.8, 0 - h,
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ehhl, vhl,
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w * 0.4 - hhl, h / 4,
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w * 0.4, h / 4,
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w * 0.4 - ehhl, 0 - h / 4 + vhl,
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w * 0.4, 0 - h / 4,
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)
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# Right
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self.fixed_commands = "%s m %f,%f c %f,%f %f,%f %f,%f c %f,%f %f,%f %f,%f " % (
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self.fixed_commands,
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w * 0.1, h *0.75,
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0 - hhl, 0,
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(0 - w * 0.4) + ehhl, 0 - h / 4 + vhl,
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0 - w * 0.4, 0 - h / 4,
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ehhl, 0 - vhl,
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w * 0.4 - hhl, 0 - h / 4,
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w * 0.4, 0 - h / 4,
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)
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def draw_one(self, x, y):
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return "M %f,%f %s" % (x, y, self.fixed_commands)
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def parameter_text(self):
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text = super(DiamondLatticeGenerator, self).parameter_text()
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return "%s curve: %.1f" % (text, self.diamond_curve)
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class CrossLatticeGenerator(Generator):
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def __init__(self, *args):
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super(CrossLatticeGenerator, self).__init__(*args)
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self.e_height = self.p_spacing
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self.name = "cross"
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def prerender(self):
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l = self.e_length
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h = self.e_height
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self.fixed_commands = (
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"m %f,%f l %f,%f l %f,%f m %f,%f l %f,%f"
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"m %f,%f l %f,%f l %f,%f l %f,%f "
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"m %f,%f l %f,%f l %f,%f l %f,%f "
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"m %f,%f l %f,%f l %f,%f m %f,%f l %f,%f"
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) % (
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# Left
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0, h * 0.5,
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l * 0.2, 0,
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l * 0.2, 0 - h * 0.3,
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0 - l * 0.2, h * 0.3,
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l * 0.2, h * 0.3,
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# Top
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0 - l * 0.3, 0 - h * 0.5,
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l * 0.2, 0 - h * 0.3,
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l * 0.4, 0,
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l * 0.2, h * 0.3,
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# Bottom
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0, h * 0.4,
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0 - l * 0.2, h * 0.3,
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0 - l * 0.4, 0,
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0 - l * 0.2, 0 - h * 0.3,
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# Right
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l * 0.5, 0 - h * 0.5,
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l * 0.2, h * 0.3,
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0 - l * 0.2, h * 0.3,
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l * 0.2, 0 - h * 0.3,
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l * 0.2, 0,
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)
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class WavyLatticeGenerator(Generator):
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def __init__(self, *args, **kwargs):
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super(WavyLatticeGenerator, self).__init__(*args)
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self.e_height = self.p_spacing
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self.name = "wavy"
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def prerender(self):
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h = self.e_height
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w = self.e_length
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self.fixed_commands = (
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" m %f,%f h %f c %f,%f %f,%f %f,%f h %f "
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"m %f,%f h %f c %f,%f %f,%f %f,%f h %f "
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) % (
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0, h, # Start of element (left)
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w * 0.1, # Short horiz line.
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w * 0.1, 0, # Control 1
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w * 3 / 40, 0 - h / 2, # Control 2
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w * 0.2, 0 - h / 2, # Curve top.
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w * 0.175, # Top horiz line.
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0 - w * 0.1, 0 - h / 2, # Move to higher line.
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w * 0.3, # Long higher horiz line.
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w / 5, 0, # Control 1
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w / 10, h, # Control 2
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w * 0.25, h, # Curve down.
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w * 0.075, # End horiz line.
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)
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class LivingHingeEffect(inkex.EffectExtension):
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"""
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Extension to create laser cut bend lattices.
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"""
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def add_arguments(self, pars):
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pars.add_argument("--tab", help="Bend pattern to generate")
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pars.add_argument("--unit", help="Units for dimensions")
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pars.add_argument("--swatch", type=inkex.Boolean, help="Draw as a swatch card")
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pars.add_argument("--width", type=float, default=300, help="Width of pattern")
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pars.add_argument("--height", type=float, default=100, help="Height of pattern")
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pars.add_argument("--sl_length", type=int, default=20, help="Length of links")
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pars.add_argument("--sl_gap", type=float, default=0.5, help="Gap between links")
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pars.add_argument("--sl_spacing", type=float, default=20, help="Spacing of links")
|
||
|
|
|
||
|
|
pars.add_argument("--dl_curve", type=float, default=0.5, help="Curve of diamonds")
|
||
|
|
pars.add_argument("--dl_length", type=float, default=24, help="Length of diamonds")
|
||
|
|
pars.add_argument("--dl_spacing", type=float, default=4, help="Spacing of diamonds")
|
||
|
|
|
||
|
|
pars.add_argument("--cl_length", type=float, default=24, help="Length of combs")
|
||
|
|
pars.add_argument("--cl_spacing", type=float, default=6, help="Spacing of combs")
|
||
|
|
|
||
|
|
pars.add_argument("--wl_length", type=int, default=20, help="Length of links")
|
||
|
|
pars.add_argument("--wl_interval", type=int, default=30, help="Interval between links")
|
||
|
|
pars.add_argument("--wl_spacing", type=float, default=0.5, help="Spacing between links")
|
||
|
|
|
||
|
|
def convert(self, value):
|
||
|
|
return self.svg.unittouu(str(value) + self.options.unit)
|
||
|
|
|
||
|
|
def convertmm(self, value):
|
||
|
|
return self.svg.unittouu('%fmm' % value)
|
||
|
|
|
||
|
|
def effect(self):
|
||
|
|
stroke_width = self.svg.unittouu("0.2mm")
|
||
|
|
self.options.width = self.convert(self.options.width)
|
||
|
|
self.options.height = self.convert(self.options.height)
|
||
|
|
|
||
|
|
def draw_one(x, y):
|
||
|
|
if self.options.tab == "straight_lattice":
|
||
|
|
generator = StraightLatticeGenerator(
|
||
|
|
x,
|
||
|
|
y,
|
||
|
|
self.options.width,
|
||
|
|
self.options.height,
|
||
|
|
stroke_width,
|
||
|
|
self.svg,
|
||
|
|
self.convertmm(self.options.sl_length),
|
||
|
|
self.convertmm(self.options.sl_spacing),
|
||
|
|
link_gap=self.convertmm(self.options.sl_gap),
|
||
|
|
)
|
||
|
|
elif self.options.tab == "diamond_lattice":
|
||
|
|
generator = DiamondLatticeGenerator(
|
||
|
|
x,
|
||
|
|
y,
|
||
|
|
self.options.width,
|
||
|
|
self.options.height,
|
||
|
|
stroke_width,
|
||
|
|
self.svg,
|
||
|
|
self.convertmm(self.options.dl_length),
|
||
|
|
self.convertmm(self.options.dl_spacing),
|
||
|
|
diamond_curve=self.options.dl_curve,
|
||
|
|
)
|
||
|
|
elif self.options.tab == "cross_lattice":
|
||
|
|
generator = CrossLatticeGenerator(
|
||
|
|
x,
|
||
|
|
y,
|
||
|
|
self.options.width,
|
||
|
|
self.options.height,
|
||
|
|
stroke_width,
|
||
|
|
self.svg,
|
||
|
|
self.convertmm(self.options.cl_length),
|
||
|
|
self.convertmm(self.options.cl_spacing),
|
||
|
|
)
|
||
|
|
elif self.options.tab == "wavy_lattice":
|
||
|
|
generator = WavyLatticeGenerator(
|
||
|
|
x,
|
||
|
|
y,
|
||
|
|
self.options.width,
|
||
|
|
self.options.height,
|
||
|
|
stroke_width,
|
||
|
|
self.svg,
|
||
|
|
self.convertmm(self.options.wl_length),
|
||
|
|
self.convertmm(self.options.wl_spacing),
|
||
|
|
)
|
||
|
|
else:
|
||
|
|
inkex.errormsg("Select a valid pattern tab before rendering.")
|
||
|
|
return
|
||
|
|
generator.generate(self.options.swatch)
|
||
|
|
|
||
|
|
if self.options.swatch or not self.svg.selected:
|
||
|
|
draw_one(0, 0)
|
||
|
|
else:
|
||
|
|
for elem in self.svg.selected.values():
|
||
|
|
# Determine width and height based on the selected object's bounding box.
|
||
|
|
bbox = elem.bounding_box()
|
||
|
|
self.options.width = bbox.width
|
||
|
|
self.options.height = bbox.height
|
||
|
|
x = bbox.x.minimum
|
||
|
|
y = bbox.y.minimum
|
||
|
|
draw_one(x, y)
|
||
|
|
|
||
|
|
LivingHingeEffect().run()
|