def generate_spokes(self, root_radius, spoke_width, spokes, mount_radius, mount_hole,
unit_factor, unit_label):
""" given a set of constraints
- generate the svg path for the gear spokes
- lies between mount_radius (inner hole) and root_radius (bottom of the teeth)
- spoke width also defines the spacing at the root_radius
- mount_radius is adjusted so that spokes fit if there is room
- if no room (collision) then spokes not drawn
"""
if not spokes:
return []
# Spokes
collision = False # assume we draw spokes
messages = [] # messages to send back about changes.
spoke_holes = []
r_outer = root_radius - spoke_width
try:
spoke_count = spokes
spokes = [i*2*pi/spokes for i in range(spoke_count)]
except TypeError:
spoke_count = len(spokes)
spokes = [radians(a) for a in spokes]
spokes.append(spokes[0]+two_pi)
# checks for collision with spokes
# check for mount hole collision with inner spokes
if mount_radius <= mount_hole/2:
adj_factor = (r_outer - mount_hole/2) / 5
if adj_factor < 0.1:
# not enough reasonable room
collision = True
else:
mount_radius = mount_hole/2 + adj_factor # small fix
messages.append("Mount support too small. Auto increased to %2.2f%s." % (mount_radius/unit_factor*2, unit_label))
# then check to see if cross-over on spoke width
for i in range(spoke_count):
angle = spokes[i]-spokes[i-1]
if spoke_width >= angle * mount_radius:
adj_factor = 1.2 # wrong value. its probably one of the points distances calculated below
mount_radius += adj_factor
messages.append("Too many spokes. Increased Mount support by %2.3f%s" % (adj_factor/unit_factor, unit_label))
# check for collision with outer rim
if r_outer <= mount_radius:
# not enough room to draw spokes so cancel
collision = True
if collision: # don't draw spokes if no room.
messages.append("Not enough room for Spokes. Decrease Spoke width.")
else: # draw spokes
for i in range(spoke_count):
self.boxes.ctx.save()
start_a, end_a = spokes[i], spokes[i+1]
# inner circle around mount
asin_factor = spoke_width/mount_radius/2
# check if need to clamp radius
asin_factor = max(-1.0, min(1.0, asin_factor)) # no longer needed - resized above
a = asin(asin_factor)
# is inner circle too small
asin_factor = spoke_width/r_outer/2
# check if need to clamp radius
asin_factor = max(-1.0, min(1.0, asin_factor)) # no longer needed - resized above
a2 = asin(asin_factor)
l = vlength(vdiff(point_on_circle(mount_radius, start_a + a),
point_on_circle(r_outer, start_a + a2)))
self.boxes.moveTo(*point_on_circle(mount_radius, start_a + a), degrees=degrees(start_a))
self.boxes.polyline(
l,
+90+degrees(a2), 0,
(degrees(end_a-start_a-2*a2), r_outer), 0,
+90+degrees(a2),
l, 90-degrees(a), 0,
(-degrees(end_a-start_a-2*a), mount_radius),
0, 90+degrees(a2), 0
)
self.boxes.ctx.restore()
return messages
def generate_spokes(self, root_radius, spoke_width, spokes, mount_radius, mount_hole,
unit_factor, unit_label):
""" given a set of constraints
- generate the svg path for the gear spokes
- lies between mount_radius (inner hole) and root_radius (bottom of the teeth)
- spoke width also defines the spacing at the root_radius
- mount_radius is adjusted so that spokes fit if there is room
- if no room (collision) then spokes not drawn
"""
if not spokes:
return []
# Spokes
collision = False # assume we draw spokes
messages = [] # messages to send back about changes.
spoke_holes = []
r_outer = root_radius - spoke_width
try:
spoke_count = spokes
spokes = [i*2*pi/spokes for i in range(spoke_count)]
except TypeError:
spoke_count = len(spokes)
spokes = [radians(a) for a in spokes]
spokes.append(spokes[0]+two_pi)
# checks for collision with spokes
# check for mount hole collision with inner spokes
if mount_radius <= mount_hole/2:
adj_factor = (r_outer - mount_hole/2) / 5
if adj_factor < 0.1:
# not enough reasonable room
collision = True
else:
mount_radius = mount_hole/2 + adj_factor # small fix
messages.append("Mount support too small. Auto increased to %2.2f%s." % (mount_radius/unit_factor*2, unit_label))
# then check to see if cross-over on spoke width
for i in range(spoke_count):
angle = spokes[i]-spokes[i-1]
if spoke_width >= angle * mount_radius:
adj_factor = 1.2 # wrong value. its probably one of the points distances calculated below
mount_radius += adj_factor
messages.append("Too many spokes. Increased Mount support by %2.3f%s" % (adj_factor/unit_factor, unit_label))
# check for collision with outer rim
if r_outer <= mount_radius:
# not enough room to draw spokes so cancel
collision = True
if collision: # don't draw spokes if no room.
messages.append("Not enough room for Spokes. Decrease Spoke width.")
else: # draw spokes
for i in range(spoke_count):
self.boxes.ctx.save()
start_a, end_a = spokes[i], spokes[i+1]
# inner circle around mount
asin_factor = spoke_width/mount_radius/2
# check if need to clamp radius
asin_factor = max(-1.0, min(1.0, asin_factor)) # no longer needed - resized above
a = asin(asin_factor)
# is inner circle too small
asin_factor = spoke_width/r_outer/2
# check if need to clamp radius
asin_factor = max(-1.0, min(1.0, asin_factor)) # no longer needed - resized above
a2 = asin(asin_factor)
l = vlength(vdiff(point_on_circle(mount_radius, start_a + a),
point_on_circle(r_outer, start_a + a2)))
self.boxes.moveTo(*point_on_circle(mount_radius, start_a + a), degrees=degrees(start_a))
self.boxes.polyline(
l,
+90+degrees(a2), 0,
(degrees(end_a-start_a-2*a2), r_outer), 0,
+90+degrees(a2),
l, 90-degrees(a), 0,
(-degrees(end_a-start_a-2*a), mount_radius),
0, 90+degrees(a2), 0
)
self.boxes.ctx.restore()
return messages