### Help with square spiral (python)

and this python code:
def calc_spiral( p_num_edges ):
"""Function to calculate each edge to draw."""

values = range( p_num_edges, -1, -1 )

state = True # if true x-axis if false y-axis
direction = True # if true + if false -
c = 0 # counter used to know when direction should change
lx = 0 # last x-axis value
ly = 0 # last y-axis value

# Each item on the list ( segments ) contains:
# ( Axis, Origin point in axis, end point in axis,
# Value of opposite axis, Drawing direction )
segments = [ ]

for i in range( len( values ) ):
# change direction each two iterations
if c % 2 == 0: direction = not direction
if state: # if x-axis
# added or subtracted according to the direction
if not direction:
nlx = lx + values[ i ]
else:
nlx = lx - values[ i ]
v = ( "x", lx, nlx, ly, direction )
lx = nlx
else: # if y-axis
# added or subtracted according to the direction
if not direction:
nly = ly + values[ i ]
else:
nly = ly - values[ i ]
v = ( "y", ly, nly, lx, direction )
ly = nly
segments.append( v )
# change axis each iteration
state = not state
c += 1

return segments

def draw_spiral( self, p_segments, p_num_edges ):
"""Function used to draw segments on chart."""

# Clear axes from previous drawing
self.__axes.cla()
# Draw each segment taking care about it's axis and direction
for item in p_segments:
if item[ 0 ] == "x":
if not item[ 4 ]:
xv = range( item[ 1 ], item[ 2 ] + 1, 1 )
else:
xv = range( item[ 1 ], item[ 2 ] - 1, -1 )
yv = map( lambda _ : item[ 3 ], xv )
elif item[ 0 ] == "y":
if not item[ 4 ]:
yv = range( item[ 1 ], item[ 2 ] + 1, 1 )
else:
yv = range( item[ 1 ], item[ 2 ] - 1, -1 )
xv = map( lambda _ : item[ 3 ], yv )
self.__axes.plot( xv, yv )

# Set axis limits and draw
m = float( p_num_edges ) + 1
self.__axes.axes.set_xlim( [ -1.0, m ] )
self.__axes.axes.set_ylim( [ -1.0, m ] )
self.__fig.canvas.draw()
I don't think you noticed: this is a C++ forum.

I won't even go into what is wrong with your post if this was python forum.
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