Only update last datum graphic(s) on clear ticks
When a new tick comes in but no new time step / bar is yet needed (to be appended) we can simply adjust **only** the last bar datum lines-graphic(s) to avoid a redraw of the preceding `QPainterPath` on every tick. Do this by calling `Viz.draw_last()` on the fast and slow chart and adjusting the guards around calls to `Viz.update_graphics()` (which *does* update paths) to only enter when there's a `do_px_step` condition. We can stop calling `main_viz.plot.vb._set_yrange()` on view treading cases since the range should have already been adjusted by the clearing-tick processing mxmn updates. Further this changes, - the `chart_maxmin()` helper (which we should eventually just get rid of) to take bound in `Viz`s for the ohlc and vlm chart instead of the chart widget handles. - extend the guard around hist viz yranging to only enter when not in "axis mode" - the same as for the fast viz.multichartz_backup
Tyler Goodlet
parent
3b9bada561
commit
5b6ee10e6b
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@ -86,9 +86,9 @@ log = get_logger(__name__)
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# https://arxiv.org/abs/cs/0610046
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# https://github.com/lemire/pythonmaxmin
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def chart_maxmin(
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chart: ChartPlotWidget,
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fast_viz: Viz,
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fqsn: str,
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vlm_chart: ChartPlotWidget | None = None,
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vlm_viz: Viz | None = None,
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) -> tuple[
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@ -102,8 +102,7 @@ def chart_maxmin(
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Compute max and min datums "in view" for range limits.
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'''
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main_viz = chart.get_viz(chart.name)
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out = main_viz.maxmin()
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out = fast_viz.maxmin()
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if out is None:
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return (0, 0, 0)
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@ -121,10 +120,15 @@ def chart_maxmin(
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# TODO: we need to NOT call this to avoid a manual
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# np.max/min trigger and especially on the vlm_chart
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# vizs which aren't shown.. like vlm?
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if vlm_chart:
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out = vlm_chart.maxmin()
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if vlm_viz:
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out = vlm_viz.maxmin()
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if out:
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_, mx_vlm_in_view = out
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(
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ixrng,
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read_slc,
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mxmn,
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) = out
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mx_vlm_in_view = mxmn[1]
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return (
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mx,
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@ -308,11 +312,13 @@ async def graphics_update_loop(
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)
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vlm_chart = vlm_charts[fqsn]
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vlm_viz = vlm_chart._vizs.get('volume') if vlm_chart else None
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maxmin = partial(
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chart_maxmin,
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fast_chart,
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fast_viz,
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fqsn,
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vlm_chart,
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vlm_viz,
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)
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(
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last_mx,
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@ -375,7 +381,7 @@ async def graphics_update_loop(
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})
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if vlm_chart:
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vlm_pi = vlm_chart._vizs['volume'].plot
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vlm_pi = vlm_viz.plot
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vlm_sticky = vlm_pi.getAxis('right')._stickies['volume']
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ds.vlm_chart = vlm_chart
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ds.vlm_sticky = vlm_sticky
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@ -517,31 +523,21 @@ def graphics_update_cycle(
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# update ohlc sampled price bars
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if (
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do_rt_update
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or do_px_step
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# do_rt_update
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# or do_px_step
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(liv and do_px_step)
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or trigger_all
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):
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main_viz.update_graphics(array_key=fqsn)
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hist_viz.draw_last(array_key=fqsn)
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else:
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main_viz.draw_last(
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array_key=fqsn,
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# only_last_uppx=True,
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)
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# don't real-time "shift" the curve to the
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# left unless we get one of the following:
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if (
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(
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should_tread
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and do_px_step
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and liv
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)
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or trigger_all
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):
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chart.increment_view(datums=append_diff)
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main_viz.plot.vb._set_yrange(viz=main_viz)
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# main_viz.plot.vb._set_yrange(viz=main_viz)
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# NOTE: since vlm and ohlc charts are axis linked now we don't
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# need the double increment request?
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@ -587,9 +583,14 @@ def graphics_update_cycle(
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ds.last_price_sticky.update_from_data(*end_ic)
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ds.hist_last_price_sticky.update_from_data(*end_ic)
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if wap_in_history:
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# update vwap overlay line
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chart.get_viz('bar_wap').update_graphics()
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# if wap_in_history:
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# chart.get_viz('bar_wap').update_graphics()
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# update OHLC chart last bars
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# TODO: fix the only last uppx stuff....
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main_viz.draw_last() # only_last_uppx=True)
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hist_viz.draw_last() # only_last_uppx=True)
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# L1 book label-line updates
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if typ in ('last',):
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@ -659,7 +660,8 @@ def graphics_update_cycle(
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liv
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and not chart._static_yrange == 'axis'
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):
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main_vb = chart._vizs[fqsn].plot.vb
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main_vb = main_viz.plot.vb
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if (
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main_vb._ic is None
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or not main_vb._ic.is_set()
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@ -693,14 +695,23 @@ def graphics_update_cycle(
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ds=ds,
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is_1m=True,
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)
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if hist_liv:
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hist_viz.plot.vb._set_yrange(viz=hist_viz)
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if (
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hist_liv
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and not hist_chart._static_yrange == 'axis'
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):
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hist_viz.plot.vb._set_yrange(
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viz=hist_viz,
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# yrange=yr, # this is the rt range, not hist.. XD
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)
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# XXX: update this every draw cycle to ensure y-axis auto-ranging
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# only adjusts when the in-view data co-domain actually expands or
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# contracts.
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varz['last_mx'], varz['last_mn'] = mx, mn
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# TODO: a similar, only-update-full-path-on-px-step approach for all
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# fsp overlays and vlm stuff..
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# run synchronous update on all `Viz` overlays
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for curve_name, viz in chart._vizs.items():
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