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Document `Viz.incr_info()` outputs

multichartz_backup
Tyler Goodlet 2023-01-18 16:28:48 -05:00
parent 6e3518a860
commit a77c42edf3
1 changed files with 40 additions and 2 deletions
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42
piker/ui/_dataviz.py
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@ -1086,8 +1086,46 @@ class Viz(msgspec.Struct): # , frozen=True):
is_1m: bool = False,
) -> tuple:
'''
Return a slew of graphics related data-flow metrics to do with
incrementally updating a data view.
_, _, _, r = self.bars_range() # most recent right datum index in-view
Output info includes,
----------------------
uppx: float
x-domain units-per-pixel.
liv: bool
telling if the "last datum" is in vie"last datum" is in
view.
do_px_step: bool
recent data append(s) are enough that the next physical
pixel-column should be used for drawing.
i_diff_t: float
the difference between the last globally recorded time stamp
aand the current one.
append_diff: int
diff between last recorded "append index" (the index at whic
`do_px_step` was last returned `True`) and the current index.
do_rt_update: bool
`True` only when the uppx is less then some threshold
defined by `update_uppx`.
should_tread: bool
determines the first step, globally across all callers, that
the a set of data views should be "treaded", shifted in the
x-domain such that the last datum in view is always in the
same spot in non-view/scene (aka GUI coord) terms.
'''
# get most recent right datum index in-view
l, start, datum_start, datum_stop, stop, r = self.datums_range()
lasts = self.shm.array[-1]
i_step = lasts['index'] # last index-specific step.
i_step_t = lasts['time'] # last time step.
@ -1136,7 +1174,7 @@ class Viz(msgspec.Struct): # , frozen=True):
# is such that a datum(s) update to graphics wouldn't span
# to a new pixel, we don't update yet.
i_last_append = varz['i_last_append']
append_diff = i_step - i_last_append
append_diff: int = i_step - i_last_append
do_px_step = append_diff >= uppx
do_rt_update = (uppx < update_uppx)