Source code for boxes.generators.regularstarbox

# 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
#   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 <>.

from boxes import *

class SlotEdge(edges.Edge):

    def __call__(self, length, **kw):
        t, n = self.settings.thickness, self.settings.n
        r, h = self.settings.radius, self.settings.h
        sh = # distance side to center

        li = 2 * sh * math.tan(math.radians(90/n)) # side inner 2x polygon
        ls2 = t / math.tan(math.radians(180/n))
        ls1 = t / math.cos(math.radians(90-(180/n)))

        lo = (length-li-2*ls1)/2

        li = li - 2*ls2 # correct for overlap of wall

        d = h/2

        if li > 0:
            poly = [lo-1, (90, 1), d+t-1, -90, ls1+ls2, -90, d-t, (90, t)]
            self.polyline(*(poly + [li-2*t] + list(reversed(poly))))
            raise ValueError("Box is too small and has too many corners to work properly")

    def startwidth(self) -> float:
        return self.settings.thickness

[docs] class RegularStarBox(Boxes): """Regular polygon boxes that form a star when closed""" ui_group = "Box" description = """![Open box](static/samples/RegularStarBox-2.jpg)""" def __init__(self) -> None: Boxes.__init__(self) self.addSettingsArgs(edges.FingerJointSettings) self.buildArgParser("h", "outside") self.argparser.add_argument( "--radius", action="store", type=float, default=50.0, help="inner radius if the box (center to corners)") self.argparser.add_argument( "--n", action="store", type=int, default=5, choices=(3, 4, 5), help="number of sides") def render(self): r, h, n = self.radius, self.h, self.n if self.outside: self.r = r = r - self.thickness / math.cos(math.radians(360/(2*n))) self.h = h = self.adjustSize(h) t = self.thickness fingerJointSettings = copy.deepcopy(self.edges["f"].settings) fingerJointSettings.setValues(self.thickness, angle=360./n) fingerJointSettings.edgeObjects(self, chars="gGH") self.edges["e"] = SlotEdge(self, self) r, sh, side = self.regularPolygon(n, radius=r) = sh with self.saved_context(): self.regularPolygonWall(corners=n, r=r, edges='F', move="right") self.regularPolygonWall(corners=n, r=r, edges='F', move="right") self.regularPolygonWall(corners=n, r=r, edges='F', move="up only") for s in range(2): with self.saved_context(): if n % 2: for i in range(n): self.rectangularWall(side, h, move="right", edges="fgeG") else: for i in range(n//2): self.rectangularWall(side, h, move="right", edges="fGeG") self.rectangularWall(side, h, move="right", edges="fgeg") self.rectangularWall(side, h, move="up only", edges="fgeG")