x = px
else:
x += px
if y is None:
y = py
else:
y += py
# if we found values, set some guides
if len(average.keys()) > 0:
ax = float(x) / len(average.keys())
ay = float(y) / len(average.keys())
# first, guides for the average
# attention: a vertical guide has a horizontal value
g.appendVGuide(ax)
# attention: a horizontal guide has a vertical value
g.appendHGuide(ay)
# then some guides for the off-curves
if len(guides.keys()) > 0:
for gx, gy in guides.keys():
g.appendVGuide(gx)
g.appendHGuide(gy)
g.update()
else:
print "no points selected"
g.update()
