Happy birthday to you Edward. But putting birthday aside, I can't resist to
comment on some parts of your post.
On Sunday, August 13, 2023 at 11:31:16 AM UTC+2 Edward K. Ream wrote:
Today is my 74th birthday. This Engineering Notebook post is my birthday
present to myself.
- We can't use VNode generators because they don't yield VNodes in outline
order.
I really don't know where did you get this idea from? Have you test it? For
me they always give me the nodes in the outline order. Maybe we don't use
the same generator? Here is mine:
def v_generator(v):
yield v
for ch in v.children:
yield from v_generator(ch)
a = ('hidden-root-vnode-gnx',) + tuple(p.gnx for p in c.all_positions())
b = tuple(v.gnx for v in v_generator(c.hiddenRootNode))
assert a == b
# of coarse you can avoid yielding root vnode with
# a slightly different generator
def v_gen2(vs):
for ch in vs:
yield ch
yield from v_gen2(ch.children)
# and it can be used like this
a = tuple(p.gnx for p in c.all_positions())
b = tuple(v.gnx for v in v_gen2(c.hiddenRootNode.children))
assert a == b
g.es('ok')
The parents attribute is never used in this generators so it is completely
free to be modified by the scripts. The information about outline order is
fully contained in the v.children attributes. The v.parents attribute is
necessary only if you want to continue traversal in outline order from any
given point.
Vitalije
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