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ink_helper.py
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ink_helper.py
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# -*- coding: utf-8 -*-
'''
Generates Inkscape SVG file containing box components needed to
laser cut a tabbed construction box taking kerf and clearance into account
Copyright (C) 2016 Apple Muncy [email protected]
Copyright (C) 2011 elliot white [email protected]
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
import math
import sys,inkex,simplestyle,gettext
import math
def drawS(XYstring, parent): # Draw lines from a list
name='part'
style = { 'stroke': '#000000', 'fill': 'none' }
drw = {'style':simplestyle.formatStyle(style),inkex.addNS('label','inkscape'):name,'d':XYstring}
inkex.etree.SubElement(parent, inkex.addNS('path','svg'), drw )
return
def drawArc(r, (cx , cy ), start , end, parent):
# http://wiki.inkscape.org/wiki/index.php/Generating_objects_from_extensions
#
style = { 'stroke': '#000000', 'stroke-width': '1', 'fill': 'none' }
ell_attribs = {'style':simplestyle.formatStyle(style),
inkex.addNS('cx','sodipodi') :str(cx),
inkex.addNS('cy','sodipodi') :str(cy),
inkex.addNS('rx','sodipodi') :str(r),
inkex.addNS('ry','sodipodi') :str(r),
inkex.addNS('start','sodipodi') :str(start),
inkex.addNS('end','sodipodi') :str(end),
inkex.addNS('open','sodipodi') :'true', #all ellipse sectors we will draw are open
inkex.addNS('type','sodipodi') :'arc',
'transform' :'' }
inkex.etree.SubElement(parent, inkex.addNS('path','svg'), ell_attribs )
def drawCircle(r, (cx, cy), parent):
drawArc(r, (cx,cy), 0 , 2*math.pi, parent)
def appendScript(parent,x,y, text):
super = inkex.etree.SubElement(parent, inkex.addNS('text', 'svg'),
{'style':'font-size:200%' , 'fill':'red' , 'x':'{0}'.format(x) , 'y':'{0}'.format(y)})
super.text = text
def cutoutArea( (centerLnX , centerLnY) , ( dX , dY) ,parent, cornerR = 0.0 ):
''' draws a cutout opening given two centerlines, length and width, and corner radius)
'''
x0,y0 = centerLnX -dX , centerLnY -dY
x1,y1 = centerLnX -dX + cornerR , centerLnY -dY +cornerR
x2,y2 = centerLnX + dX - cornerR , centerLnY +dY -cornerR
x3,y3 = centerLnX + dX , centerLnY +dY
S='M '+str(x1)+','+str(-y0)+' '
S+='L '+str(x2) +','+str( -y0) +' '
S+='M '+str(x3)+','+str(-y1)+' '
S+='L '+str(x3) +','+str( -y2) +' '
S+='M '+str(x2)+','+str(-y3)+' '
S+='L '+str(x1) +','+str( -y3) +' '
S+='M '+str(x0)+','+str(-y2)+' '
S+='L '+str(x0) +','+str( -y1) +' '
drawS(S , parent)
drawArc(cornerR, (x2 , -y1 ), 0 , math.pi/2, parent)
drawArc(cornerR, (x1 , -y1 ), math.pi/2 , math.pi, parent)
drawArc(cornerR, (x1 , -y2 ), math.pi , 3*math.pi/2, parent)
drawArc(cornerR, (x2 , -y2 ), 3*math.pi/2 , 0, parent)
def draw_nema((x,y), my_dict):
bearing_diameter = my_dict['bearing_diameter']
slot_length = my_dict['slot_length']
parent = my_dict['parent']
screw_offset = my_dict['screw_offset']
screw_r = my_dict['screw_diameter']/2
cutoutArea((x,y), (bearing_diameter/2 , slot_length + bearing_diameter/2) , parent , bearing_diameter/2)
cutoutArea((x+screw_offset ,y+screw_offset ), (screw_r , slot_length + screw_r ) , parent ,screw_r )
cutoutArea((x-screw_offset ,y+screw_offset ), (screw_r , slot_length + screw_r ) , parent
,screw_r )
cutoutArea((x+screw_offset ,y-screw_offset ), (screw_r , slot_length +
screw_r ) , parent ,screw_r )
cutoutArea((x-screw_offset ,y-screw_offset ), (screw_r , slot_length + screw_r ) , parent ,screw_r )
def draw_bearing((x,y), my_dict):
drawCircle(my_dict['bearing_diameter']/2,(x,-y),my_dict['parent'])
drawCircle(my_dict['screw_diameter']/2,(x - my_dict['screw_offset'],-y),my_dict['parent'])
drawCircle(my_dict['screw_diameter']/2,(x + my_dict['screw_offset'],-y),my_dict['parent'])
def drill(center, diameter, n_pt):
from math import sin, cos, pi
center = Vec2(center)
radius = diameter / 2.
out = Vec2([1, 0])
up = Vec2([0, 1])
path = Path([center + out * radius])
dtheta = (2 * pi) / n_pt
for k in range(n_pt + 1):
path.append(center + out * radius * cos(k * dtheta) + up * radius * sin(k * dtheta))
return path
def t_slot(center, orient, thickness, screw_length, screw_diameter, nut_diameter, nut_height ):
'''
make one t-slot starting
__
| |
-----------+ +-----+ ------
| ^
x center | screw_diameter x----------------------> orient
| v
-----------+ +-----+ ------
| |
--
'''
orient = orient*(screw_length - thickness -nut_height )
orient = Vec2(orient)
out = orient / orient.norm()
up = Vec2([out[1], -out[0]])
center = Vec2(center)
screw_r = screw_diameter / 2.
nut_r = nut_diameter / 2.
nut_w = screw_diameter
#nut_w = nut_height
path = Path([center + up * screw_r])
path.append_from_last(orient )
path.append_from_last(up * (nut_r - screw_r))
path.append_from_last(out * nut_height )
path.append_from_last(-up * (nut_r - screw_r))
path.append_from_last(out * (nut_height/4))
path.append_from_last(-up * screw_r)
path.extend(path.reflect(center, up).reverse())
return path
class Vec2:
'''
There be dragons here!
A class providing a 2 dimensional vector space.
'''
def __init__(self, x, y=None):
if y is None:
y = x[1]
x = x[0]
self.x = x
self.y = y
def norm(self):
'''
returns the scaler of Vec2.self
'''
return math.sqrt(self.x ** 2 + self.y ** 2)
def __getitem__(self, idx):
return [self.x, self.y][idx]
def __neg__(self):
return Vec2(-self.x, -self.y)
def __add__(self, other):
return Vec2(self.x + other[0], self.y + other[1])
def __sub__(self, other):
return self + [-other[0], -other[1]]
def __mul__(self, scalar):
return Vec2(self.x * scalar, self.y * scalar)
def __div__(self, scalar):
return Vec2(self.x / scalar, self.y / scalar)
def dot(self, other):
return self.x * other[0] + self.y * other[1]
def inner(self, other):
return self.dot(other)
def outer(self, other):
return [[self[0] * other[0], self[0] * other[1]],
[self[1] * other[0], self[1] * other[1]]]
def __repr__(self):
return 'Vec2(%s, %s)' % (self.x, self.y)
def toXY(self):
return '%s,%s ' % (self.x, self.y)
def mat_x_vec(mat, vec):
return Vec2(vec.dot(mat[0]), vec.dot(mat[1]))
def sign(x):
return 1 if x > 0 else -1
class Path:
def __init__(self, path=()):
self.path = [Vec2(p) for p in path]
def append(self, point):
self.path.append(Vec2(point))
def rotate(self, center, angle):
'''
angle in degrees
'''
from math import cos, sin
angle *= math.pi / 180.
R = [[cos(angle), -sin(angle)],
[sin(angle), cos(angle)]]
out = [mat_x_vec(R, p - center) + center for p in self.path]
return Path(out)
def translate(self, vec):
return Path([p + vec for p in self.path])
def append_from_last(self, v):
self.path.append(self.path[-1] + v)
def extend(self, points):
self.path.extend(points)
def __getitem__(self, idx):
return self.path[idx]
def reflect(self, center, orient):
out = self.translate(-center)
R = Vec2(orient).outer(orient)
R = [[1 - 2 * R[0][0], 2 * R[0][1]],
[2 * R[1][0], 1 - 2 * R[1][1]]]
out = Path([mat_x_vec(R, p) for p in out])
out = out.translate(center)
return out
def reverse(self):
return Path(self.path[::-1])
def drawXY(self):
XYstring = 'M ' + 'L '.join([p.toXY() for p in self.path])
return XYstring
def plot(self, lt='-'):
from pylab import plot
xs = [l.x for l in self.path]
ys = [l.y for l in self.path]
plot(xs, ys, lt)
def Vec2__test__():
v1 = Vec2(1, 1)
assert abs(v1.norm() - math.sqrt(2)) < 1e-8
assert abs(-v1[0] + 1) < 1e-8
assert abs((v1 + v1)[0] - 2) < 1e-8
assert abs((v1 - v1)[0] - 0) < 1e-8
assert abs((v1 + [1, 2]).x - 2) < 1e-8
assert abs((v1 - [1, 2]).x - 0) < 1e-8
assert (v1.dot(v1) - v1.norm() ** 2) < 1e-8
Vec2__test__()
if __name__ == '__main__':
from pylab import plot, figure, clf, show, axis
from numpy import array
mm = 1.
center = [0, 30]
orient = [10,2]
screw_diameter = 3 * mm
nut_diameter = 5.5 * mm
nut_w = 1.8 * mm
screw_length = 16 * mm
thickness = 6 * mm
orient = Vec2(orient)
# setup out and up as unit vectors
out = orient / orient.norm()
up = Vec2([-out[1], out[0]])
center = Vec2(center)
screw_r = screw_diameter / 2.
nut_r = nut_diameter / 2.
path = Path([center + up * screw_r])
path.append_from_last(orient)
path.append_from_last(up * (nut_r - screw_r))
path.append_from_last(out * (nut_w))
path.append_from_last(-up * (nut_r - screw_r))
path.append_from_last(out * (screw_length - thickness))
path.append_from_last(-up * screw_r)
print ('out is {0}'.format(out))
print ('center is {0}'.format(center))
print ('up is {0}'.format(up))
up=Vec2([-up[0],up[1]])
print ('up is {0}'.format(up))
rest = path.reflect(center, up).reverse()
path.extend(rest)
path.plot()
rest.plot('o-')
axis('equal')
show()
# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 fileencoding=utf-8 textwidth=99