Implement lid locking mechanism

battery-case-generator.py

@@ -52,6 +52,7 @@ args.corner_inset  = args.corner_s*math.sqrt(3)/math.pi
 args.plug_inset    = args.plug_radius/math.sqrt(3)
 args.interior_edge = args.grid*args.dimension*0.5+args.outside_padding
 args.plug_edge     = args.interior_edge-args.thickness
+args.disc_radius   = 0.45*(math.sqrt(3)-1)*args.plug_edge+args.plug_inset
 args.exterior_edge = args.interior_edge+2.0*args.thickness
 args.interior_leg  = (args.interior_edge-args.horizontal_finger-args.kerf)/2-args.corner_inset
 finger_length      = args.interior_edge-2.0*args.corner_inset
@@ -84,16 +85,33 @@ def draw_grid(cx, cy):
         for col in range(num_col):
             HOLES += '<circle cx="%.2f" cy="%.2f" r="%.2f"/>\n' % (cxr+col*args.grid, cyr, args.radius)
 
+def draw_disc(cx, cy, layer):
+    global HOLES, SHAPES, MARKS
+    turtle       = svgturtle.SvgTurtle(cx, cy)
+    turtle.penup()
+    turtle.forward(args.disc_radius)
+    turtle.pendown()
+    turtle.left(90)
+    turtle.circle(args.disc_radius)
+    turtle.penup()
+    turtle.home()
+    if layer=='disc':
+        HOLES += '<path d="%s"/>\n' % turtle.to_s()
+    else:
+        MARKS += '<path d="%s"/>\n' % turtle.to_s()
+
 def draw_plane(cx, cy, layer):
     global HOLES, SHAPES, MARKS
     if layer=='interior':
         edge = args.interior_edge
-    elif layer=='plug' or layer=='plug_mark':
+    elif layer=='plug' or layer=='plug_mark' or layer=='opening':
         edge = args.plug_edge
     else:
         edge = args.exterior_edge
     turtle       = svgturtle.SvgTurtle(cx, cy)
     turtle.penup()
+    if layer=='plug_mark':
+        turtle.right(30)
     turtle.forward(edge)
     turtle.right(120)
     if layer=='interior':
@@ -113,6 +131,14 @@ def draw_plane(cx, cy, layer):
         turtle.forward(edge-2.0*args.corner_inset)
         turtle.circle(-args.corner_radius, 60)
     elif layer=='plug' or layer=='plug_mark':
+        turtle.forward(args.plug_inset)
+        turtle.pendown()
+        for side in range(6):
+            turtle.right(90)
+            turtle.circle(0.5*edge-args.plug_inset, 180)
+            turtle.right(90)
+            turtle.circle(-args.plug_radius, 60)
+    elif layer=='opening':
         turtle.forward(args.plug_inset)
         turtle.pendown()
         for side in range(6):
@@ -292,9 +318,12 @@ draw_grid(1.5*BOX, 0.5*BOX)
 draw_plane(1.5*BOX, 0.5*BOX, 'interior')
 draw_plane(0.5*BOX, 1.5*BOX, 'bottom')
 draw_plane(1.5*BOX, 1.5*BOX, 'rim')
-draw_plane(1.5*BOX, 1.5*BOX, 'plug')
+draw_plane(1.5*BOX, 1.5*BOX, 'opening')
+draw_disc(1.5*BOX, 1.5*BOX, 'disc')
+draw_plane(2.5*BOX, 0.5*BOX, 'plug')
 draw_plane(2.5*BOX, 1.5*BOX, 'lid')
 draw_plane(2.5*BOX, 1.5*BOX, 'plug_mark')
+draw_disc(2.5*BOX, 1.5*BOX, 'disc_mark')
 draw_case(0.05*args.grid*args.dimension, 2.0*BOX, args.height+args.extra_height+args.thickness, args.slots)
 print('<g fill="none" stroke="black">', SHAPES, '</g>', '<g fill="none" stroke="red">', HOLES, '</g>', '<g fill="none" stroke="blue">', MARKS, '</g>', sep='\n')
 print('</svg>')

svgturtle.py

@@ -53,22 +53,27 @@ class SvgTurtle():
                 self.left(w)
             self.right(w2)
         else:
-            ra  = extent*self.cvtangle
+            if extent>355:
-            h   = self.heading-.5*ra if radius>0 else self.heading+.5*ra
+                self.circle(radius, 355)
-            dx  = abs(radius)*math.cos(h)
+                extent -= 355
-            dy  = abs(radius)*math.sin(h)
+            ra  = self.cvtangle*(extent if radius < 0 else -extent)
+            cx  = self.x+radius*math.cos(self.heading-.5*math.pi)
+            cy  = self.y+radius*math.sin(self.heading-.5*math.pi)
+            th  = self.heading+.5*math.pi+ra
+            dx  = cx+radius*math.cos(th)-self.x
+            dy  = cy+radius*math.sin(th)-self.y
             lg  = 1 if extent >= 180 else 0
             sw  = 0 if radius > 0 else 1
             if self.pen:
+                if self.path == '':
+                    self.path = "M %.2f,%.2f" % (self.x,self.y)
                 self.path += " a %.2f %.2f %.2f %d %d %.2f %.2f" % (radius, radius, extent, lg, sw, dx, dy)
             elif self.path != '':
                 self.path += " m %.2f, %.2f" % (dx, dy)
             self.x += dx
             self.y += dy
-            if radius > 0:
+            self.heading = (self.heading + ra) % math.tau
-                self.left(extent)
+
-            else:
-                self.right(extent)
 
     def to_s(self):
         return self.path
@@ -77,6 +82,8 @@ class SvgTurtle():
         self.x        = self.homex
         self.y        = self.homey
         self.heading  = 0
+        if self.path != '':
+            self.path += " M %.2f, %.2f" % (self.x, self.y)
 
     def reset(self):
         self.path = ''

svgturtletest.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+
+import svgturtle
+
+print('<svg viewBox="0 0 2000 2000" xmlns="http://www.w3.org/2000/svg">')
+turtle_tl = svgturtle.SvgTurtle(500, 750)
+turtle_tr = svgturtle.SvgTurtle(1500, 750)
+turtle_bl = svgturtle.SvgTurtle(500, 1000)
+turtle_br = svgturtle.SvgTurtle(1500, 1000)
+ANGLE=0
+for i in range(7):
+    turtle_tl.home()
+    turtle_tl.left(ANGLE)
+    turtle_tl.circle(110+i*50, (i+1)*45, 50)
+    turtle_bl.home()
+    turtle_bl.right(ANGLE)
+    turtle_bl.circle(-(110+i*50), (i+1)*45, 50)
+    turtle_tr.home()
+    turtle_tr.right(ANGLE)
+    turtle_tr.circle(140+i*50, (i+1)*45, 50)
+    turtle_br.home()
+    turtle_br.left(ANGLE)
+    turtle_br.circle(-(140+i*50), (i+1)*45, 50)
+print('<path fill="none" stroke="black" d="%s %s %s %s"/>' % (turtle_tl.to_s(), turtle_tr.to_s(), turtle_bl.to_s(), turtle_br.to_s()))
+turtle_tl.reset()
+turtle_tr.reset()
+turtle_bl.reset()
+turtle_br.reset()
+for i in range(8):
+    turtle_tl.home()
+    turtle_tl.left(ANGLE)
+    turtle_tl.circle(100+i*50, (i+1)*45)
+    turtle_bl.home()
+    turtle_bl.right(ANGLE)
+    turtle_bl.circle(-(100+i*50), (i+1)*45)
+    turtle_tr.home()
+    turtle_tr.right(ANGLE)
+    turtle_tr.circle(130+i*50, (i+1)*45)
+    turtle_br.home()
+    turtle_br.left(ANGLE)
+    turtle_br.circle(-(130+i*50), (i+1)*45)
+print('<path fill="none" stroke="blue" d="%s %s %s %s"/>' % (turtle_tl.to_s(), turtle_tr.to_s(), turtle_bl.to_s(), turtle_br.to_s()))
+print('</svg>')