Start battery case generator

battery-case-generator.py

@@ -0,0 +1,85 @@
+#!/usr/bin/env python3
+
+import math
+import sys
+import argparse
+import svgturtle
+
+parser = argparse.ArgumentParser(description='Generate a hexagonal battery case')
+parser.add_argument('--dimension', default=5, type=int, help='Grid dimension')
+parser.add_argument('--height', type=float, help='Height of battery')
+parser.add_argument('--hole', default='AA', help='Hole diameter (mm or A, AA, AAA)')
+parser.add_argument('--kerf', default=.1, type=float, help='Kerf')
+parser.add_argument('--horizontal-finger', default=10.0, type=float, help='Width of horizontal fingers')
+parser.add_argument('--vertical-finger', default=5.0, type=float, help='Width of vertical fingers')
+parser.add_argument('--padding', default=1.5, type=float, help='Padding around holes')
+parser.add_argument('--outside-padding', default=2, type=float, help='Extra padding between holes and wall')
+parser.add_argument('--thickness', default=3.0, type=float, help='Thickness of material')
+parser.add_argument('--lid', default=0.2, type=float, help='How much extra play to give the lid')
+
+args = parser.parse_args()
+assert (args.dimension % 2) == 1
+
+BATTERY = {
+    'AAA': [10.5, 44.5],
+    'AA':  [14.5, 50.5],
+    'C':   [26.2, 50.0],
+    'D':   [34.2, 61.5],
+}
+
+if args.hole in BATTERY:
+    dim = BATTERY[args.hole]
+    args.hole = dim[0]
+    if args.height == None:
+        args.height = dim[1]
+else:
+    args.hole = float(args.hole)
+    assert(args.height != None)
+
+GRID   = args.hole+args.padding
+RADIUS = args.hole/2
+DIMX   = 2*(args.dimension+2)*GRID
+DIMY   = (args.dimension+2)*GRID
+PI3    = math.pi/3
+
+def draw_grid(cx, cy):
+    for row in range(-int(args.dimension/2), int((args.dimension+1)/2)):
+        cyr = cy+GRID*row*math.sin(PI3)
+        num_col = args.dimension-abs(row)
+        cxr = cx-.5*GRID*(num_col-1.0)
+        for col in range(num_col):
+            print('<circle cx="%.2f" cy="%.2f" r="%.2f" stroke="black" fill="none"/>' % (cxr+col*GRID, cyr, RADIUS))
+
+def draw_plane(cx, cy, interior=False):
+    radius = GRID*args.dimension*0.5+args.outside_padding
+    if not interior:
+        radius += args.thickness
+    turtle       = svgturtle.SvgTurtle(cx, cy)
+    turtle.penup()
+    turtle.forward(radius)
+    turtle.right(120)
+    turtle.pendown()
+    if interior:
+        leg = (radius-args.horizontal_finger-args.kerf)/2
+        for side in range(6):
+            turtle.forward(leg)
+            turtle.left(90)
+            turtle.forward(args.thickness)
+            turtle.right(90)
+            turtle.forward(args.horizontal_finger+args.kerf)
+            turtle.right(90)
+            turtle.forward(args.thickness)
+            turtle.left(90)
+            turtle.forward(leg)
+            turtle.right(60)
+    else:
+        for side in range(6):
+            turtle.forward(radius)
+            turtle.right(60)
+    print('<path d="%s" fill="none" stroke="black"/>' % turtle.to_s())
+
+print('<svg viewBox="0 0 %.2f %.2f" width="%.2fmm" height="%.2fmm" stroke-width="0.1" xmlns="http://www.w3.org/2000/svg">' % (DIMX, DIMY, DIMX, DIMY))
+draw_grid(GRID*(0.5*args.dimension+1), GRID*(0.5*args.dimension+1))
+draw_plane(GRID*(0.5*args.dimension+1), GRID*(0.5*args.dimension+1), True)
+draw_plane(GRID*(1.5*args.dimension+3), GRID*(0.5*args.dimension+1))
+print('</svg>')