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boxespy
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Add dove tail joints

This commit is contained in:
Florian Festi 2013-04-01 18:32:07 +02:00
parent a89db65828
commit 68ad631f1d
1 changed files with 83 additions and 20 deletions
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103
boxes.py
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@ -10,13 +10,14 @@ class Boxes:
self.thickness = thickness
self.burn = 0.1
self.fingerJointSettings = (10.0, 10.0)
self.doveTailJointSettings = (15, 10, 60, 2) # width, depth, angle, radius
self.flexSettings = (1.5, 3.0, 15.0) # line distance, connects, width
self.output = "box.svg"
self._init_surface()
def _init_surface(self):
width = 300
height = 200
width = 700
height = 400
self.surface = cairo.SVGSurface(self.output, width, height)
self.ctx = ctx = cairo.Context(self.surface)
@ -45,7 +46,7 @@ class Boxes:
self.ctx.arc_negative(0, -(radius+self.burn), radius+self.burn,
0.5*math.pi, rad + 0.5*math.pi)
self.continueDirection(degrees)
self.continueDirection(rad)
def edge(self, length):
self.ctx.line_to(length, 0)
@ -96,6 +97,50 @@ class Boxes:
self.ctx.line_to(length, 0)
self.ctx.translate(*self.ctx.get_current_point())
# helpers for doveTailJoint
def _turnLeft(self, radius, angle):
self.ctx.arc(0, radius, radius,
-0.5*math.pi, angle)
self.continueDirection(0.5*math.pi+angle)
def _turnRight(self, radius, angle):
self.ctx.arc_negative(0, -radius, radius,
0.5*math.pi, -angle)
self.continueDirection(-0.5*math.pi - angle)
def _turn(self, radius, angle, right=True):
if right:
self._turnRight(radius, angle)
else:
self._turnLeft(radius, angle)
def doveTailJoint(self, length, positive=True, settings=None):
width, depth, angle, radius = settings or self.doveTailJointSettings
angle = math.pi*angle/180.0
alpha = 0.5*math.pi - angle
l1 = radius/math.tan(alpha/2.0)
diffx = 0.5*depth/math.tan(alpha)
l2 = 0.5*depth / math.sin(alpha)
sections = int((length) // (width*2))
leftover = length - sections*width*2
self.edge((width+leftover)/2.0+diffx-l1)
for i in xrange(sections):
self._turn(radius+self.burn, angle, right=positive)
self.edge(2*(l2-l1))
self._turn(radius-self.burn, angle, right=not positive)
self.edge(2*(diffx-l1)+width)
self._turn(radius-self.burn, angle, right=not positive)
self.edge(2*(l2-l1))
self._turn(radius+self.burn, angle, right=positive)
if i<sections-1: # all but the last
self.edge(2*(diffx-l1)+width)
self.edge((width+leftover)/2.0+diffx-l1)
self.ctx.translate(*self.ctx.get_current_point())
def flex(self, x, h, settings=None):
dist, connection, width = settings or self.flexSettings
lines = int(x // dist)
@ -141,9 +186,9 @@ class Boxes:
self.ctx.rotate(degrees*math.pi/180.0)
self.ctx.move_to(0, 0)
def continueDirection(self, degrees):
def continueDirection(self, angle=0):
self.ctx.translate(*self.ctx.get_current_point())
self.ctx.rotate(degrees*math.pi/180.0)
self.ctx.rotate(angle)
####################################################################
### Parts
@ -153,31 +198,49 @@ class Boxes:
self.ctx.save()
self.moveTo(r, 0)
for i in range(2):
self.fingerJoint(x-2*r)
self.corner(90, r)
self.fingerJoint(y-2*r)
self.corner(90, r)
self.fingerJoint(0.5*x-r)
self.fingerJoint(0.5*x-r)
self.corner(90, r)
self.fingerJoint(y-2*r)
self.corner(90, r)
self.fingerJoint(x-2*r)
self.corner(90, r)
self.fingerJoint(y-2*r)
self.corner(90, r)
self.ctx.restore()
def wall(self, x=100, y=100, h=100, r=0):
self.ctx.save()
self.moveTo(r, 0)
self.moveTo(20, 0)
c4 = (r+self.burn)*math.pi*0.5 # circumference of quarter circle
for i in range(2):
self.fingerJoint(x-2*r, positive=False)
#self.fingerHoleEdge(x-2*r, 5)
self.flex(c4, h)
#self.fingerJoint(y-2*r, positive=False)
self.fingerHoleEdge(y-2*r, 5)
self.flex(c4, h)
#self.fingerJoint(0.5*x-r, positive=False)
self.fingerHoleEdge(0.5*x-r, 5)
self.flex(c4, h)
#self.fingerJoint(y-2*r, positive=False)
self.fingerHoleEdge(y-2*r, 5)
self.flex(c4, h)
self.fingerHoleEdge(x-2*r, 5)
#self.fingerJoint(x-2*r, positive=False)
self.flex(c4, h)
self.fingerHoleEdge(y-2*r, 5)
self.flex(c4, h)
#self.fingerJoint(0.5*x-r, positive=False)
self.fingerHoleEdge(0.5*x-r, 5)
self.corner(90)
self.edge(h)
self.edge(20)
self.doveTailJoint(h-20, positive=False)
self.corner(90)
self.edge(2*(x+y-4*r)+4*c4)
self.corner(90)
self.edge(h)
self.doveTailJoint(h-20)
self.edge(20)
self.corner(90)
self.ctx.restore()