Add generator for Z-Beam or U-Beam

Can be a Z-Beam or a U-Beam depending on the orientation of the
pieces. With the --flanged_ubeam option, a 4th piece is added for a flange.

boxes/generators/zbeam.py

@@ -0,0 +1,50 @@
+# 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/>.
+
+from boxes import *
+
+
+class ZBeam(Boxes):
+    """Simple Z-Beam (or U-Beam): three pieces joined at right angles"""
+
+    ui_group = "Part"
+
+    def __init__(self) -> None:
+        Boxes.__init__(self)
+        self.buildArgParser("x", "y")
+        self.argparser.add_argument(
+            "--z", action="store", type=float, default=100.0)
+        self.argparser.add_argument(
+            "--flanged_ubeam", action="store", type=boolarg, default=False,
+            help="Add a fourth piece to make a U-Beam with a flange")
+        self.buildArgParser("h", "outside")
+        self.addSettingsArgs(edges.FingerJointSettings)
+
+    def render(self):
+        x, y, z, h = self.x, self.y, self.z, self.h
+        t = self.thickness
+
+        if self.outside:
+            x = self.adjustSize(x, False)
+            y = self.adjustSize(y, False)
+            z = self.adjustSize(z, False)
+
+        self.rectangularWall(x, h, "eFee", move="right")
+        self.rectangularWall(y, h, "efef", move="right")
+        if self.flanged_ubeam:
+            self.rectangularWall(y, h, "eFeF", move="right")
+            self.rectangularWall(z + self.thickness, h, "eeef")
+        else:
+            self.rectangularWall(z, h, "eeeF")