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Add detailed `.addItem()`` comment

mkts_backup
Tyler Goodlet 2022-03-06 17:16:07 -05:00
parent b0e236fadf
commit 53641abc4b
1 changed files with 10 additions and 0 deletions
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10
piker/ui/_chart.py
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@ -1032,7 +1032,17 @@ class ChartPlotWidget(pg.PlotWidget):
# (we need something that avoids clutter on x-axis). # (we need something that avoids clutter on x-axis).
self._add_sticky(name, bg_color=color) self._add_sticky(name, bg_color=color)
# NOTE: this is more or less the RENDER call that tells Qt to
# start showing the generated graphics-curves. This is kind of
# of edge-triggered call where once added any
# ``QGraphicsItem.update()`` calls are automatically displayed.
# Our internal graphics objects have their own "update from
# data" style method API that allows for real-time updates on
# the next render cycle; just note a lot of the real-time
# updates are implicit and require a bit of digging to
# understand.
pi.addItem(curve) pi.addItem(curve)
return curve, data_key return curve, data_key
# TODO: make this a ctx mngr # TODO: make this a ctx mngr