ben-counterweight/cvr.py

#!/usr/bin/python

import shape


#
# gnuplot the outline
#

def outline_gnuplot(sk, points):
    while len(points):
	print points.pop(0), points.pop(0)
    print


def gnuplot_line(x0, y0, x1, y1):
    print x0, y0
    print x1, y1
    print


#
# make a HeeksCAD sketch of the outline
#


def cad_line(sk, x0, y0, x1, y1):
    cad.line(x0, y0, x1, y1)
    cad.add(sk, cad.getlastobj())


def outline_cad(sk, points):
    last_x = points.pop(0)
    last_y = points.pop(0)
    while len(points):
	x = points.pop(0)
	y = points.pop(0)
	cad_line(sk, last_x, last_y, x, y)
	last_x = x
	last_y = y

    cad.reorder(sk)
    return sk


def closed_outline(sk, *args):
    l = list(args)
    l.append(args[0])
    l.append(args[1])
    do(sk, l)


def open_outline(sk, *args):
    do(sk, list(args))


def line(*args):
    do_line(*args)

 
#
# Make the cover sheet 2 mm larger than the counterweight on all sides. We need
# the following exceptions to avoid mechanical interference:
#
# - at the power connector, keep the ymin edge flush with the counterweight
# - follow the counterweight's J-shaped space for the reset button, with the
#   border reduced from 2 mm to 0.5 mm
# - next to the long side of the battery, follow the counterweight's edge
# - also follow the counterweight's bay for the battery cover's tongue and
#   make it even 0.5 mm larger, anticipating imperfect registration
#
# Also, as a simplification, we don't follow steps and recesses in these cases:
#
# - 1 mm steps on the left and right side. Just use the larger size.
# - the whole sponge area. Just put the cover on top of the sponge.
# - all recesses near the batter, except the one for the lid's central tongue
#
# The above simplifications are possible, because, being on top of the
# counterweight, we've already cleared the obstacles these steps and recesses
# are designed to avoid.
#

#
# Note: to visualize the shape defined below, plot the counterweight in 2D with
# gnuplot and follow the shape it the mouse.
#
# To visualize the result, do this:
#
# ./cw.py >cw.gnuplot
# ./cvr.py >cvr.gnuplot
# gnuplot
# gnuplot> set style data lines
# gnuplot> plot "cw.gnuplot", "cvr.gnuplot"
#


def outline(sk):
    closed_outline(sk,
      # counterweight corners: (16, 46) and (15, 60)
      13, 46,
      # (15, 69.5)
      13, 71.5,
      #  (82.5, 65), (82.5, 64), (89.5, 64), (89.5, 69)
      83, 71.5,
      83, 64.5,  89, 64.5,  89, 71,
      # (100, 69)
      102, 71,
      # (99.5, 46)
      102, 44,
      # (88, 46)
      86, 44,
      # (88, 55), (82, 50)
      86, 50,
      # (59.5, 55), (59.5, 56.5), (52.5, 56.5), (52.5, 55)
      60, 50,
      60, 57,  52, 57,  52, 50,
      # (24, 55)
      26, 50,
      # (24, 46)
      26, 46)


def label(sk):
    u = 2
    x = 40
    y = 66
    # C
    open_outline(sk,
      x+u, y+2*u, 
      x, y+2*u, 
      x, y, 
      x+u, y)

    x += u*1.6 
    # W
    open_outline(sk,
      x, y+2*u, 
      x, y, 
      x+0.5*u, y+u, 
      x+u, y,
      x+u, y+2*u)


# ----- Counterweight outline -------------------------------------------------


lines = []


def rect_outline(x0, y0, z0, x1, y1, z1):
    global lines

    lines.append((x0, y0, x0, y1))
    lines.append((x1, y0, x1, y1))
    lines.append((x0, y0, x1, y0))
    lines.append((x0, y1, x1, y1))


# ----- Main ------------------------------------------------------------------


if __name__ == "__main__":
    do = outline_gnuplot
    sk = None
else:
    import HeeksPython as cad

    do = outline_cad
    cad.sketch()
    sk = cad.getlastobj()


outline(sk)
label(sk)

shape.rect = rect_outline
shape.make_base()

if __name__ == "__main__":
    for e in lines:
	gnuplot_line(*e)
else:
    for e in lines:
	cad_line(sk, *e)