boxespy/boxes/generators/flexbox.py

#!/usr/bin/env python3
# Copyright (C) 2013-2014 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/>.

import boxes
import math


class FlexBox(boxes.Boxes):
    """Box with living hinge and round corners"""

    def __init__(self):
        boxes.Boxes.__init__(self)
        self.buildArgParser("x", "y", "h", "outside")
        self.argparser.add_argument(
            "--radius", action="store", type=float, default=15,
            help="Radius of the latch in mm")

    @boxes.restore
    def flexBoxSide(self, x, y, r, callback=None):
        self.moveTo(r, 0)

        for i, l in zip(range(2), (x, y)):
            self.cc(callback, i)
            self.edges["f"](l - 2 * r)
            self.corner(90, r)

        self.cc(callback, 2)
        self.edge(x - 2 * r)
        self.corner(90, r)
        self.cc(callback, 3)
        self.latch(self.latchsize)
        self.cc(callback, 4)
        self.edges["f"](y - 2 * r - self.latchsize)
        self.corner(90, r)

    def surroundingWall(self):
        x, y, h, r = self.x, self.y, self.h, self.radius

        c4 = math.pi * r * 0.5

        self.edges["F"](y - 2 * r - self.latchsize, False)
        if x - 2 * r < self.thickness:
            self.edges["X"](2 * c4 + x - 2 * r, h + 2 * self.thickness)
        else:
            self.edges["X"](c4, h + 2 * self.thickness)
            self.edges["F"](x - 2 * r, False)
            self.edges["X"](c4, h + 2 * self.thickness)
        self.edges["F"](y - 2 * r, False)
        if x - 2 * r < self.thickness:
            self.edges["X"](2 * c4 + x - 2 * r, h + 2 * self.thickness)
        else:
            self.edges["X"](c4, h + 2 * self.thickness)
            self.edge(x - 2 * r)
            self.edges["X"](c4, h + 2 * self.thickness)
        self.latch(self.latchsize, False)
        self.edge(h + 2 * self.thickness)
        self.latch(self.latchsize, False, True)
        self.edge(c4)
        self.edge(x - 2 * r)
        self.edge(c4)
        self.edges["F"](y - 2 * r, False)
        self.edge(c4)
        self.edges["F"](x - 2 * r, False)
        self.edge(c4)
        self.edges["F"](y - 2 * r - self.latchsize, False)
        self.corner(90)
        self.edge(h + 2 * self.thickness)
        self.corner(90)

    def render(self):

        if self.outside:
            self.x = self.adjustSize(self.x)
            self.y = self.adjustSize(self.y)
            self.h = self.adjustSize(self.h)

        x, y, h = self.x, self.y, self.h
        self.latchsize = 8 * self.thickness
        r = self.radius or min(x, y - self.latchsize) / 2.0
        r = min(r, x / 2.0)
        self.radius = r = min(r, max(0, (y - self.latchsize) / 2.0))
        c4 = math.pi * r * 0.5

        self.open()

        self.moveTo(self.thickness, self.thickness)
        self.surroundingWall()
        self.moveTo(self.thickness, self.h + 5 * self.thickness)
        self.flexBoxSide(self.x, self.y, self.radius)
        self.moveTo(2 * self.x + 3 * self.thickness, 0)
        self.ctx.scale(-1, 1)
        self.flexBoxSide(self.x, self.y, self.radius)

        self.close()


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


if __name__ == "__main__":
    main()