FabLab_Chemnitz/mightyscape-1.1-deprecated
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added buxtronix living hinge extension

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Mario Voigt 2021-04-24 13:27:52 +02:00
parent 029169eb21
commit 968f5dbe6e
8 changed files with 661 additions and 0 deletions
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extensions/fablabchemnitz/buxtronix_living_hinge/living_hinge.inx Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
<name>Buxtronix Living Hinges</name>
<id>fablabchemnitz.de.buxtronix_living_hinges</id>
<param name="tab" type="notebook">
<page name="straight_lattice" gui-text="Straight lattice">
<image>images/straight-lattice.png</image>
<param name="sl_length" type="int" min="1" max="200" gui-text="Length of elements" appearance="full">20</param>
<param name="sl_spacing" type="float" min="0.1" max="10.0" precision="1" gui-text="Vertical element spacing" appearance="full">2.0</param>
<param name="sl_gap" type="float" min="0.0" max="10.0" precision="1" gui-text="Element height" appearance="full">0.0</param>
<label xml:space="preserve">
</label>
</page>
<page name="diamond_lattice" gui-text="Diamond lattice">
<image>images/diamond-lattice.png</image>
<param name="dl_length" type="int" min="1" max="200" gui-text="Length of elements" appearance="full">20</param>
<param name="dl_spacing" type="float" min="0.1" max="10.0" precision="1" gui-text="Vertical element spacing" appearance="full">4.0</param>
<param name="dl_curve" type="float" min="-1.0" max="1.0" precision="1" gui-text="Curve of each element" appearance="full">0.5</param>
<label xml:space="preserve">
</label>
</page>
<page name="cross_lattice" gui-text="Cross lattice">
<image>images/cross-lattice.png</image>
<param name="cl_length" type="int" min="1" max="200" gui-text="Length of elements" appearance="full">20</param>
<param name="cl_spacing" type="float" min="0.1" max="10.0" precision="1" gui-text="Vertical element spacing" appearance="full">6.0</param>
<label xml:space="preserve">
</label>
</page>
<page name="wavy_lattice" gui-text="Wavy lattice">
<image>images/wavy-lattice.png</image>
<param name="wl_length" type="int" min="1" max="200" gui-text="Length of elements" appearance="full">29</param>
<param name="wl_spacing" type="float" min="0.1" max="10.0" precision="1" gui-text="Vertical element spacing" appearance="full">4.0</param>
<label xml:space="preserve">
</label>
</page>
<page name="about" gui-text="About/Help">
<label xml:space="preserve">
This extension renders Living Hinges, aka lattice hinges aka laser kerf bending.
These patterns allow otherwise rigid materials (eg wood, acrylic) to have bends formed in them.
</label>
<image>images/about.png</image>
<label appearance="url">https://github.com/buxtronix/living-hinge</label>
</page>
</param>
<param name="width" type="float" min="0" max="10000" gui-text="Width">100</param>
<param name="height" type="float" min="0" max="10000" gui-text="Height">100</param>
<param name="unit" gui-text="Unit for width/height" type="optiongroup" appearance="minimal">
<option value="mm">mm</option>
<option value="cm">cm</option>
<option value="in">in</option>
</param>
<label>If any object(s) are currently selected, their bounding boxes will be filled with the pattern
instead of using the above Width/Height. Slider dimensions are all millimetres.</label>
<separator />
<param name="swatch" type="boolean" gui-text="Draw swatch card">false</param>
<effect>
<object-type>all</object-type>
<effects-menu>
<submenu name="FabLab Chemnitz">
<submenu name="Shape/Pattern from Generator"/>
</submenu>
</effects-menu>
</effect>
<script>
<command reldir="inx" interpreter="python">living_hinge.py</command>
</script>
</inkscape-extension>

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extensions/fablabchemnitz/buxtronix_living_hinge/living_hinge.py Executable file
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#!/usr/bin/env python3
import inkex
cut_colour = '#ff0000'
engrave_colour = '#0000ff'
class Generator(object):
"""A generic generator, subclassed for each different lattice style."""
def __init__(self, x, y, width, height, stroke_width, svg, e_length, p_spacing):
self.x = x
self.y = y
self.width = width
self.height = height
self.stroke_width = stroke_width
self.svg = svg
self.canvas = self.svg.get_current_layer()
self.e_length = e_length
self.e_height = 0 # Provided by sub-classes.
self.p_spacing = p_spacing
self.fixed_commands = ""
def draw_one(self, x, y):
return "M %f,%f %s" % (x, y, self.fixed_commands)
def parameter_text(self):
return "length: %.f spacing: %.1f" % (
self.e_length,
self.p_spacing,
)
def draw_swatch(self):
border = self.canvas.add(inkex.PathElement())
# Curve radius
cr = self.svg.unittouu('10mm')
# Swatch padding
sp = self.svg.unittouu('30mm')
# Handle length
hl = cr/2
path_command = (
'm %f,%f l %f,%f c %f,%f %f,%f %f,%f'
'l %f,%f c %f,%f %f,%f %f,%f '
'l %f,%f c %f,%f %f,%f %f,%f '
'l %f,%f c %f,%f %f,%f %f,%f ') % (
cr, 0,
self.width - 2*cr, 0,
hl, 0,
cr, cr-hl,
cr, cr,
0, self.height - 2*cr + 1.5*sp,
0, cr/2,
0-cr+hl, cr,
0-cr, cr,
0-self.width + 2*cr, 0,
0-hl, 0,
0-cr, 0-cr+hl,
0-cr, 0-cr,
0, 0-self.height - 1.5*sp + 2*cr,
0, 0-hl,
cr-hl, 0-cr,
cr, 0-cr
)
style = {
"stroke": cut_colour,
"stroke-width": str(self.stroke_width),
"fill": "none",
}
border.update(**{"style": style, "inkscape:label": "lattice_border", "d": path_command})
c = self.canvas.add(inkex.Circle(
style=str(inkex.Style(style)),
cx=str(cr),
cy=str(cr),
r=str(self.svg.unittouu('4mm'))))
self.y += sp
text_style = {
'fill': engrave_colour,
'font-size': '9px',
'font-family': 'sans-serif',
'text-anchor': 'middle',
'text-align': 'center',
}
text = self.canvas.add(
inkex.TextElement(
style=str(inkex.Style(text_style)),
x=str(self.x + self.width/2),
y=str(self.y - sp/2)))
text.text = "Style: %s" % self.name
text_style['font-size'] = "3px"
text = self.canvas.add(
inkex.TextElement(
style=str(inkex.Style(text_style)),
x=str(self.x + self.width/2),
y=str(self.y - sp/4)))
text.text = self.parameter_text()
text = self.canvas.add(
inkex.TextElement(
style=str(inkex.Style(text_style)),
x=str(self.x + self.width/2),
y=str(self.y +self.height + sp/4)))
text.text = "https://github.com/buxtronix/living-hinge"
def generate(self, swatch):
if swatch:
self.draw_swatch()
# Round width/height to integer number of patterns.
self.e_length = self.width / max(round(self.width / self.e_length), 1.0)
self.e_height = self.height / max(round(self.height / self.e_height), 1.0)
self.prerender()
style = {
"stroke": cut_colour,
"stroke-width": str(self.stroke_width),
"fill": "none",
}
path_command = ""
y = self.y
while y < self.y + self.height:
x = self.x
while x < self.x + self.width:
path_command = "%s %s " % (path_command, self.draw_one(x, y))
x += self.e_length
y += self.e_height
link = self.canvas.add(inkex.PathElement())
link.update(**{"style": style, "inkscape:label": "lattice", "d": path_command})
link.description("%s hinge %s" % (self.name, self.parameter_text()))
class StraightLatticeGenerator(Generator):
def __init__(self, *args, **kwargs):
super(StraightLatticeGenerator, self).__init__(*args)
self.link_gap = kwargs['link_gap']
self.e_height = 2 * self.p_spacing
self.name = "straight"
def prerender(self):
self.e_height = 2 * self.p_spacing
w = self.e_length
lg = self.link_gap
if lg < 0.1:
# Single line for 0 height gap.
self.fixed_commands = " m %f,%f h %f m %f,%f h %f m %f,%f h %f" % (
0, self.e_height / 2,
w * 2 / 5,
0 - w / 5, 0 - self.e_height / 2,
w * 3 / 5,
0 - w / 5, self.e_height / 2,
w * 2 / 5,
)
else:
self.fixed_commands = (
" m %f,%f h %f v %f h %f"
" m %f,%f h %f v %f h %f v %f"
" m %f,%f h %f v %f h %f "
) % (
0,
self.e_height / 2,
w * 2 / 5,
lg,
0 - w * 2 / 5,
w / 8,
0 - lg - self.e_height / 2,
w * 3 / 4,
lg,
0 - w * 3 / 4,
0 - lg,
w * 7 / 8,
lg + self.e_height / 2,
0 - w * 2 / 5,
0 - lg,
w * 2 / 5,
)
def parameter_text(self):
text = super(StraightLatticeGenerator, self).parameter_text()
return "%s element_height: %.1f" % (text, self.link_gap)
class DiamondLatticeGenerator(Generator):
def __init__(self, *args, **kwargs):
super(DiamondLatticeGenerator, self).__init__(*args)
self.e_height = self.p_spacing
self.diamond_curve = kwargs['diamond_curve']
self.name = "diamond"
def prerender(self):
h = self.e_height
w = self.e_length
# Diamond curve
dc = 0-self.diamond_curve
# Horiz handle length.
hhl = abs(dc * w * 0.2)
# Endpoint horiz handle length
ehhl = hhl if dc > 0 else 0
# Vert handle length
vhl = abs(dc * h / 8) if dc < 0 else 0
# Left
self.fixed_commands = " m %f,%f c %f,%f %f,%f %f,%f c %f,%f %f,%f %f,%f " % (
0, h / 4,
hhl, 0,
w * 0.4 - ehhl, h / 4 - vhl,
w * 0.4, h / 4,
0 - ehhl, vhl,
0 - (w * 0.4 - hhl), h / 4,
0 - w * 0.4, h / 4,
)
# Bottom
self.fixed_commands = "%s m %f,%f c %f,%f %f,%f %f,%f s %f,%f %f,%f " % (
self.fixed_commands,
w * 0.1, h / 4,
ehhl, 0 - vhl,
w * 0.4 - hhl, 0 - h / 4,
w * 0.4, 0 - h / 4,
w * 0.4 - ehhl, h / 4 - vhl,
w * 0.4, h / 4,
)
# Top
self.fixed_commands = "%s m %f,%f c %f,%f %f,%f %f,%f s %f,%f %f,%f " % (
self.fixed_commands,
0 - w * 0.8, 0 - h,
ehhl, vhl,
w * 0.4 - hhl, h / 4,
w * 0.4, h / 4,
w * 0.4 - ehhl, 0 - h / 4 + vhl,
w * 0.4, 0 - h / 4,
)
# Right
self.fixed_commands = "%s m %f,%f c %f,%f %f,%f %f,%f c %f,%f %f,%f %f,%f " % (
self.fixed_commands,
w * 0.1, h *0.75,
0 - hhl, 0,
(0 - w * 0.4) + ehhl, 0 - h / 4 + vhl,
0 - w * 0.4, 0 - h / 4,
ehhl, 0 - vhl,
w * 0.4 - hhl, 0 - h / 4,
w * 0.4, 0 - h / 4,
)
def draw_one(self, x, y):
return "M %f,%f %s" % (x, y, self.fixed_commands)
def parameter_text(self):
text = super(DiamondLatticeGenerator, self).parameter_text()
return "%s curve: %.1f" % (text, self.diamond_curve)
class CrossLatticeGenerator(Generator):
def __init__(self, *args):
super(CrossLatticeGenerator, self).__init__(*args)
self.e_height = self.p_spacing
self.name = "cross"
def prerender(self):
l = self.e_length
h = self.e_height
self.fixed_commands = (
"m %f,%f l %f,%f l %f,%f m %f,%f l %f,%f"
"m %f,%f l %f,%f l %f,%f l %f,%f "
"m %f,%f l %f,%f l %f,%f l %f,%f "
"m %f,%f l %f,%f l %f,%f m %f,%f l %f,%f"
) % (
# Left
0, h * 0.5,
l * 0.2, 0,
l * 0.2, 0 - h * 0.3,
0 - l * 0.2, h * 0.3,
l * 0.2, h * 0.3,
# Top
0 - l * 0.3, 0 - h * 0.5,
l * 0.2, 0 - h * 0.3,
l * 0.4, 0,
l * 0.2, h * 0.3,
# Bottom
0, h * 0.4,
0 - l * 0.2, h * 0.3,
0 - l * 0.4, 0,
0 - l * 0.2, 0 - h * 0.3,
# Right
l * 0.5, 0 - h * 0.5,
l * 0.2, h * 0.3,
0 - l * 0.2, h * 0.3,
l * 0.2, 0 - h * 0.3,
l * 0.2, 0,
)
class WavyLatticeGenerator(Generator):
def __init__(self, *args, **kwargs):
super(WavyLatticeGenerator, self).__init__(*args)
self.e_height = self.p_spacing
self.name = "wavy"
def prerender(self):
h = self.e_height
w = self.e_length
self.fixed_commands = (
" m %f,%f h %f c %f,%f %f,%f %f,%f h %f "
"m %f,%f h %f c %f,%f %f,%f %f,%f h %f "
) % (
0, h, # Start of element (left)
w * 0.1, # Short horiz line.
w * 0.1, 0, # Control 1
w * 3 / 40, 0 - h / 2, # Control 2
w * 0.2, 0 - h / 2, # Curve top.
w * 0.175, # Top horiz line.
0 - w * 0.1, 0 - h / 2, # Move to higher line.
w * 0.3, # Long higher horiz line.
w / 5, 0, # Control 1
w / 10, h, # Control 2
w * 0.25, h, # Curve down.
w * 0.075, # End horiz line.
)
class LivingHingeEffect(inkex.EffectExtension):
"""
Extension to create laser cut bend lattices.
"""
def add_arguments(self, pars):
pars.add_argument("--tab", help="Bend pattern to generate")
pars.add_argument("--unit", help="Units for dimensions")
pars.add_argument("--swatch", type=inkex.Boolean, help="Draw as a swatch card")
pars.add_argument("--width", type=float, default=300, help="Width of pattern")
pars.add_argument("--height", type=float, default=100, help="Height of pattern")
pars.add_argument("--sl_length", type=int, default=20, help="Length of links")
pars.add_argument("--sl_gap", type=float, default=0.5, help="Gap between links")
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()