boxespy/boxes/generators/fanhole.py

108 lines
3.7 KiB
Python

#!/usr/bin/env python3
# Copyright (C) 2013-2016 Florian Festi
#
# 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/>.
from boxes import *
class FanHole(Boxes):
"""Hole pattern for mounting a fan"""
ui_group = "Holes"
def __init__(self):
Boxes.__init__(self)
self.argparser.add_argument(
"--diameter", action="store", type=float, default=80,
help="diameter of the fan hole")
self.argparser.add_argument(
"--mounting_holes", action="store", type=float, default=3,
help="diameter of the fan mounting holes")
self.argparser.add_argument(
"--mounting_holes_inset", action="store", type=float, default=5,
help="distance of the fan mounting holes from the outside")
self.argparser.add_argument(
"--arms", action="store", type=int, default=10,
help="number of arms")
self.argparser.add_argument(
"--inner_disc", action="store", type=float, default=.2,
help="relative size of the inner disc")
self.argparser.add_argument(
"--style", action="store", type=str, default="CW Swirl",
choices=["CW Swirl", "CCW Swirl", "Hole"],
help="Style of the fan hole")
def arc(self, d, a):
r = abs(1/math.cos(math.radians(90-a/2))*d/2)
self.corner(-a/2)
self.corner(a, r)
self.corner(-a/2)
def swirl(self, r, ri_rel=.1, n=20):
d = 2*r
#r = d/2
ri = ri_rel * r
ai = 90
ao = 360/n * 0.8
# angle going in
a1 = math.degrees(math.atan(
ri*math.sin(math.radians(ai)) /
(r - ri*math.cos(math.radians(ai)))))
d1= (ri*math.sin(math.radians(ai))**2 +
(r - ri*math.cos(math.radians(ai)))**2)**.5
d2= (ri*math.sin(math.radians(ai-ao))**2 +
(r - ri*math.cos(math.radians(ai-ao)))**2)**.5
# angle coming out
a_i2 = math.degrees(math.atan(
(r*math.sin(math.radians(ao)) - ri*math.sin(math.radians(ai))) /
(r*math.cos(math.radians(ao)) - ri*math.cos(math.radians(ai)))))
a3 = a1 + a_i2
a2 = 90 + a_i2 - ao
self.moveTo(0, -r, 180)
for i in range(n):
with self.saved_context():
self.corner(-ao, r)
self.corner(-a2)
self.arc(d2, -90)
self.corner(-180+a3)
self.arc(d1, 85)
self.corner(-90-a1)
self.moveArc(-360./n, r)
def render(self):
r_h = self.mounting_holes / 2
d = self.diameter
inset = self.mounting_holes_inset
for px in (inset, d-inset):
for py in (inset, d-inset):
self.hole(px, py, r_h)
self.moveTo(d/2, d/2)
print(self.style)
if self.style == "CW Swirl":
self.ctx.scale(-1, 1)
self.swirl(d/2, self.inner_disc, self.arms)
elif self.style == "CCW Swirl":
self.swirl(d/2, self.inner_disc, self.arms)
else: #Hole
self.hole(0, 0, d=d)