WallRack: Add side_edges parameter

Default is using h edges (finger holes) to make the rack stronger.

Changes the placement of holes in the back wall to the line up the bottom of the bottom shelf with the back wall (except when side_edges=F and flat_bottom=off is selected)

boxes/generators/wallrack.py

@@ -41,28 +41,31 @@ def __init__(self):
         self.argparser.add_argument(
             "--back_height",  action="store", type=float, default=1.5,
             help="height of the back as fraction of the front height")
+        self.argparser.add_argument(
+            "--side_edges", action="store",
+            type=ArgparseEdgeType("Fh"), choices=list("Fh"),
+            default="h", help="edge type holding the shelfs together")
         self.argparser.add_argument(
             "--flat_bottom", type=boolarg, default=False, help="Make bottom Flat, so that the rack can also stand")
 
     def generate_shelves(self, x, y, front_height, back_height):
+        se = self.side_edges
         for i in range(len(self.sh)):
             self.rectangularWall(x, y, "ffff", move="up", label=f"shelf {i+1}")
-            self.rectangularWall(x, front_height, "Ffef", move="up", label=f"front lip {i+1}")
-            self.trapezoidWall(y, front_height, back_height, "FfeF", move="right", label=f"right lip {i+1}")
-            self.trapezoidWall(y, front_height, back_height, "FfeF", move="up", label=f"left lip {i+1}")
+            self.rectangularWall(x, front_height, se + "fef", move="up", label=f"front lip {i+1}")
+            self.trapezoidWall(y, front_height, back_height, se + "fe" + se, move="right", label=f"right lip {i+1}")
+            self.trapezoidWall(y, front_height, back_height, se + "fe" + se, move="up", label=f"left lip {i+1}")
             self.move(y + self.thickness*2, back_height, "left", before=True)
 
     #Generate finger holes for back part
     def generate_finger_holes(self, x, back_height):
         t = self.thickness
-        offset = -self.sh[0] + (0 if self.flat_bottom else t)
-        for i in self.sh:
-            offset += i
-            pos_y = offset
-            self.fingerHolesAt(t*0.5, pos_y, x, 0)
-            pos_y += t*0.5
-            self.fingerHolesAt(0, pos_y, back_height, 90)
-            self.fingerHolesAt(x+t, pos_y, back_height, 90)
+        pos_y = 0
+        for h in self.sh:
+            self.fingerHolesAt(t*0.5, pos_y + 0.5*t, x, 0)
+            self.fingerHolesAt(0, pos_y + t, back_height, 90)
+            self.fingerHolesAt(x+t, pos_y + t, back_height, 90)
+            pos_y += h
 
     def render(self):
         x, y, front_height = self.x, self.y, self.wall_height
@@ -78,6 +81,7 @@ def render(self):
         else:
             total_height = sum(self.sh[:-1]) + back_height
 
-        self.rectangularWall(x+self.thickness, total_height, "EE" + self.top_edge + "E",
+        be = "e" if self.flat_bottom and self.side_edges == "F" else "E"
+        self.rectangularWall(x+self.thickness, total_height, be + "E" + self.top_edge + "E",
                              callback=[partial(self.generate_finger_holes, x, back_height)], label="back wall", move="right")
         self.generate_shelves(x, y, front_height, back_height)