Add platonic solid generator

Resolves: #254

boxes/generators/platonic.py

@@ -0,0 +1,126 @@
+#!/usr/bin/env python3
+# Copyright (C) 2020 Norbert Szulc
+#
+#   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.edges import FingerJointBase, FingerJointEdge
+
+from math import sin, pi
+
+class UnevenFingerJointEdge(FingerJointEdge):
+    """Uneven finger joint edge """
+    char = 'u'
+    description = "Uneven Finger Joint"
+    positive = True
+
+    def __call__(self, length, bedBolts=None, bedBoltSettings=None, **kw):
+        # copied from original
+
+        positive = self.positive
+
+        s, f, thickness = self.settings.space, self.settings.finger, self.settings.thickness
+
+        p = 1 if positive else -1
+
+        fingers, leftover = self.calcFingers(length, bedBolts)
+
+        if not positive:
+            play = self.settings.play
+            f += play
+            s -= play
+            leftover -= play
+
+        shift = (f + s) / 2 # we shift all fingers to make them un even
+        if (leftover < shift): 
+            leftover = shift
+
+        self.edge((leftover + shift)/2, tabs=1)  # Whole point of this class
+
+        l1,l2 = self.fingerLength(self.settings.angle)
+        h = l1-l2
+
+        d = (bedBoltSettings or self.bedBoltSettings)[0]
+
+        for i in range(fingers):
+            if i != 0:
+                if not positive and bedBolts and bedBolts.drawBolt(i):
+                    self.hole(0.5 * s,
+                              0.5 * self.settings.thickness, 0.5 * d)
+
+                if positive and bedBolts and bedBolts.drawBolt(i):
+                    self.bedBoltHole(s, bedBoltSettings)
+                else:
+                    self.edge(s)
+
+            if positive and self.settings.style == "springs":
+                self.polyline(
+                    0, -90 * p, 0.8*h, (90 * p, 0.2*h),
+                    0.1 * h, 90, 0.9*h, -180, 0.9*h, 90,
+                    f - 0.6*h,
+                    90, 0.9*h, -180, 0.9*h, 90, 0.1*h,
+                (90 * p, 0.2 *h), 0.8*h, -90 * p)
+            else:
+                self.polyline(0, -90 * p, h, 90 * p, f, 90 * p, h, -90 * p)
+
+        self.edge((leftover - shift)/2, tabs=1)  # Whole point of this class
+
+# Unstable
+class UnevenFingerJointEdgeCounterPart(UnevenFingerJointEdge): 
+    """Uneven finger joint edge - other side"""
+    char = 'U'
+    description = "Uneven Finger Joint (opposing side)"
+    positive = False
+
+class Platonic(Boxes):
+    """Platonic solids generator"""
+
+    ui_group = "Unstable" # see ./__init__.py for names
+
+    SOLIDS = {
+        "tetrahedron": (4, 3),
+        "cube": (6, 4),
+        "octahedron": (8, 3),
+        "dodecahedron": (12, 5),
+        "icosahedro": (20, 3),
+    }
+
+    def __init__(self):
+        Boxes.__init__(self)
+
+        self.addSettingsArgs(edges.FingerJointSettings, surroundingspaces=0)
+
+        self.buildArgParser(x=60, outside=True)  # x should be treated as edge length, TODO: change that
+        self.argparser.add_argument(
+            "--type",  action="store", type=str, default=list(self.SOLIDS)[0],
+            choices=list(self.SOLIDS),
+            help="type of platonic solid")
+
+
+    def render(self):
+        # adjust to the variables you want in the local scope
+        e = self.x
+        t = self.thickness
+        faces, corners = self.SOLIDS[self.type]
+
+        u = UnevenFingerJointEdge(self, self.edges["f"].settings)
+        self.addPart(u)
+
+        uc = UnevenFingerJointEdgeCounterPart(self, self.edges["f"].settings)
+        self.addPart(uc)
+
+        for _ in range(faces):
+            self.regularPolygonWall(corners, side=e, edges="u", move="right")
+
+