Only `.maybe_downsample_graphics()` on manual changes
We don't need update graphics on every x-range change since that's what the display loop does. Instead, only on manual changes do we make manual calls into `.update_graphics_from_array()` and be sure to iterate all linked subplots and all their embedded graphics.marketstore_backup
Tyler Goodlet
parent
f367f1a095
commit
d6b7ba2127
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@ -360,6 +360,7 @@ class ChartView(ViewBox):
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):
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super().__init__(
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parent=parent,
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name=name,
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# TODO: look into the default view padding
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# support that might replace somem of our
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# ``ChartPlotWidget._set_yrange()`
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@ -742,6 +743,11 @@ class ChartView(ViewBox):
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data set.
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'''
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profiler = pg.debug.Profiler(
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disabled=not pg_profile_enabled(),
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gt=ms_slower_then,
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delayed=True,
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)
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set_range = True
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chart = self._chart
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@ -769,9 +775,11 @@ class ChartView(ViewBox):
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# Make sure min bars/datums on screen is adhered.
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else:
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br = bars_range or chart.bars_range()
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profiler(f'got bars range: {br}')
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# TODO: maybe should be a method on the
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# chart widget/item?
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# if False:
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if autoscale_linked_plots:
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# avoid recursion by sibling plots
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linked = self.linkedsplits
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@ -786,6 +794,7 @@ class ChartView(ViewBox):
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bars_range=br,
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autoscale_linked_plots=False,
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)
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profiler('autoscaled linked plots')
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if set_range:
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@ -795,6 +804,8 @@ class ChartView(ViewBox):
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ylow, yhigh = yrange
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profiler(f'maxmin(): {yrange}')
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# view margins: stay within a % of the "true range"
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diff = yhigh - ylow
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ylow = ylow - (diff * range_margin)
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@ -808,6 +819,7 @@ class ChartView(ViewBox):
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yMax=yhigh,
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)
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self.setYRange(ylow, yhigh)
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profiler(f'set limits: {(ylow, yhigh)}')
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def enable_auto_yrange(
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self,
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@ -830,7 +842,9 @@ class ChartView(ViewBox):
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# iterate those.
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# - only register this when certain downsampleable graphics are
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# "added to scene".
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src_vb.sigXRangeChanged.connect(self.maybe_downsample_graphics)
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src_vb.sigRangeChangedManually.connect(
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self.maybe_downsample_graphics
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)
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# mouse wheel doesn't emit XRangeChanged
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src_vb.sigRangeChangedManually.connect(self._set_yrange)
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@ -844,25 +858,39 @@ class ChartView(ViewBox):
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self._chart._static_yrange = 'axis'
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def xs_in_px(self) -> float:
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def x_uppx(self) -> float:
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'''
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Return the "number of x units" within a single
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pixel currently being displayed for relevant
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graphics items which are our children.
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'''
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for graphic in self._chart._graphics.values():
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xvec = graphic.pixelVectors()[0]
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if xvec:
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xpx = xvec.x()
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if xpx:
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return xpx
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else:
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continue
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return 1.0
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graphics = list(self._chart._graphics.values())
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if not graphics:
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return 0
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graphic = graphics[0]
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xvec = graphic.pixelVectors()[0]
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if xvec:
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return xvec.x()
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else:
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return 0
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def maybe_downsample_graphics(self):
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uppx = self.x_uppx()
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if (
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# we probably want to drop this once we are "drawing in
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# view" for downsampled flows..
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uppx and uppx > 16
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and self._ic is not None
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):
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# don't bother updating since we're zoomed out bigly and
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# in a pan-interaction, in which case we shouldn't be
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# doing view-range based rendering (at least not yet).
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# print(f'{uppx} exiting early!')
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return
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profiler = pg.debug.Profiler(
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disabled=not pg_profile_enabled(),
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gt=3,
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@ -871,37 +899,23 @@ class ChartView(ViewBox):
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# TODO: a faster single-loop-iterator way of doing this XD
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chart = self._chart
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linked = self.linkedsplits
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plots = linked.subplots | {chart.name: chart}
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for chart_name, chart in plots.items():
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for name, graphics in chart._graphics.items():
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# print(f'maybe ds chart:{name} graphic:{name}')
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for name, graphics in chart._graphics.items():
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use_vr = False
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if isinstance(graphics, BarItems):
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use_vr = True
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# TODO: make it so we don't have to do this XD
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# if name == 'volume':
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# continue
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uppx = graphics.x_uppx()
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if (
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uppx and uppx > 16
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and self._ic is not None
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):
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# don't bother updating since we're zoomed out bigly and
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# in a pan-interaction, in which case we shouldn't be
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# doing view-range based rendering (at least not yet).
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# print(f'{uppx} exiting early!')
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return
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use_vr = False
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if isinstance(graphics, BarItems):
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use_vr = True
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# pass in no array which will read and render from the last
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# passed array (normally provided by the display loop.)
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chart.update_graphics_from_array(
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name,
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use_vr=use_vr,
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)
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profiler(f'updated {name}')
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# pass in no array which will read and render from the last
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# passed array (normally provided by the display loop.)
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chart.update_graphics_from_array(
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name,
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use_vr=use_vr,
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profiler=profiler,
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)
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profiler(f'range change updated {chart_name}:{name}')
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profiler.finish()
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# for graphic in graphics:
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# ds_meth = getattr(graphic, 'maybe_downsample', None)
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# if ds_meth:
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# ds_meth()
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