boxespy/boxes/generators/pulley.py

#!/usr/bin/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 *
from boxes import pulley
import math

class Pulley(Boxes):
    """Timing belt pulleys for different profiles"""
    def __init__(self):
        Boxes.__init__(self)
        # remove cli params you do not need
        self.buildArgParser("h")
        self.argparser.add_argument(
            "--profile",  action="store", type=str, default="GT2_2mm",
            choices=pulley.Pulley.getProfiles(),
            help="profile of the teeth/belt")
        self.argparser.add_argument(
            "--teeth",  action="store", type=int, default=20,
            help="number of teeth")
        self.argparser.add_argument(
            "--axle",  action="store", type=float, default=5,
            help="diameter of the axle")
        self.argparser.add_argument(
            "--top",  action="store", type=float, default=0,
            help="overlap of top rim (zero for none)")
        
        # Add non default cli params if needed (see argparse std lib)
        #self.argparser.add_argument(
        #    "--XX",  action="store", type=float, default=0.5,
        #    help="DESCRIPTION")
        

    def disk(self, diameter, hole, callback=None, move=""):
        w = diameter + 2*self.spacing
        if self.move(w, w, move, before=True):
            return
        self.ctx.save()
        self.moveTo(w/2, w/2)
        self.cc(callback, None, 0.0, 0.0)
        if hole:
            self.hole(0, 0, hole/2.0)
        self.moveTo(diameter/2+self.burn, 0, 90)
        self.corner(360, diameter/2)
        self.ctx.restore()
        self.move(w, w, move)
        
    def render(self):
        # adjust to the variables you want in the local scope
        t = self.thickness
        # Initialize canvas
        self.open()
        if self.top:
            self.disk(
                self.pulley.diameter(self.teeth, self.profile)+2*self.top,
                self.axle, move="right")
        for i in range(int(math.ceil(self.h/self.thickness))):
            self.pulley(self.teeth, self.profile, r_axle=self.axle/2.0, move="right")

        self.close()

def main():
    b = Box()
    b.parseArgs()
    b.render()

if __name__ == '__main__':
    main()