Attempt to make `.default_view()` time-index ready
As in make the call to `Flume.slice_from_time()` to try and convert any time index values from the view range to array-indices; all untested atm. Also drop some old/unused/moved methods: - `._set_xlimits()` - `.bars_range()` - `.curve_width_pxs()` and fix some `flow` -> `viz` var naming.epoch_index_backup
Tyler Goodlet
parent
bd2abcb91f
commit
925849b5e4
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@ -60,7 +60,7 @@ from ._style import (
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hcolor,
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CHART_MARGINS,
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_xaxis_at,
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_min_points_to_show,
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# _min_points_to_show,
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)
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from ..data.feed import (
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Feed,
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@ -951,41 +951,10 @@ class ChartPlotWidget(pg.PlotWidget):
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def focus(self) -> None:
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self.view.setFocus()
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def _set_xlimits(
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self,
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xfirst: int,
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xlast: int
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) -> None:
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"""Set view limits (what's shown in the main chart "pane")
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based on max/min x/y coords.
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"""
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self.setLimits(
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xMin=xfirst,
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xMax=xlast,
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minXRange=_min_points_to_show,
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)
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def view_range(self) -> tuple[int, int]:
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vr = self.viewRect()
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return int(vr.left()), int(vr.right())
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def bars_range(self) -> tuple[int, int, int, int]:
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'''
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Return a range tuple for the bars present in view.
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'''
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main_flow = self._vizs[self.name]
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ifirst, l, lbar, rbar, r, ilast = main_flow.datums_range()
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return l, lbar, rbar, r
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def curve_width_pxs(
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self,
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) -> float:
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_, lbar, rbar, _ = self.bars_range()
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return self.view.mapViewToDevice(
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QLineF(lbar, 0, rbar, 0)
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).length()
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def pre_l1_xs(self) -> tuple[float, float]:
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'''
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Return the view x-coord for the value just before
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@ -1038,37 +1007,65 @@ class ChartPlotWidget(pg.PlotWidget):
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Set the view box to the "default" startup view of the scene.
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'''
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flow = self._vizs.get(self.name)
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if not flow:
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viz = self.get_viz(self.name)
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if not viz:
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log.warning(f'`Viz` for {self.name} not loaded yet?')
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return
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arr = flow.shm.array
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index = arr['index']
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# times = arr['time']
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renderer = viz._src_r
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if renderer is None:
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return
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# these will be epoch time floats
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xfirst, xlast = index[0], index[-1]
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l, lbar, rbar, r = self.bars_range()
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(
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start,
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l,
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datum_start,
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datum_stop,
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r,
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stop,
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) = viz.datums_range()
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view = self.view
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array = viz.shm.array
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index_field = renderer.fmtr.index_field
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if index_field == 'time':
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vr = viz.plot.viewRect()
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(
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abs_slc,
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read_slc,
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mask,
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) = viz.flume.slice_from_time(
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array,
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start_t=vr.left(),
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stop_t=vr.right(),
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)
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iv_arr = array[mask]
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index = iv_arr['index']
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# these must be array-index-ints (hence the slice from time
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# above).
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x_start, x_stop = index[0], index[-1]
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l, lbar, rbar, r = viz.bars_range()
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view: ChartView = viz.plot.vb
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if (
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rbar < 0
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or l < xfirst
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or l < x_start
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or l < 0
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or (rbar - lbar) < 6
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):
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# TODO: set fixed bars count on screen that approx includes as
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# many bars as possible before a downsample line is shown.
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begin = xlast - bars_from_y
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begin = x_stop - bars_from_y
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view.setXRange(
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min=begin,
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max=xlast,
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max=x_stop,
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padding=0,
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)
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# re-get range
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l, lbar, rbar, r = self.bars_range()
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l, lbar, rbar, r = viz.bars_range()
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# we get the L1 spread label "length" in view coords
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# terms now that we've scaled either by user control
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@ -1076,21 +1073,21 @@ class ChartPlotWidget(pg.PlotWidget):
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# above.
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if not y_offset:
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marker_pos, l1_len = self.pre_l1_xs()
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end = xlast + l1_len + 1
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end = x_stop + l1_len + 1
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else:
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end = xlast + y_offset + 1
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end = x_stop + y_offset + 1
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begin = end - (r - l)
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# for debugging
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# print(
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# # f'bars range: {brange}\n'
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# f'xlast: {xlast}\n'
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# f'marker pos: {marker_pos}\n'
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# f'l1 len: {l1_len}\n'
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# f'begin: {begin}\n'
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# f'end: {end}\n'
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# )
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print(
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# f'bars range: {brange}\n'
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f'x_stop: {x_stop}\n'
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f'marker pos: {marker_pos}\n'
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f'l1 len: {l1_len}\n'
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f'begin: {begin}\n'
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f'end: {end}\n'
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)
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# remove any custom user yrange setttings
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if self._static_yrange == 'axis':
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@ -1254,17 +1251,17 @@ class ChartPlotWidget(pg.PlotWidget):
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**graphics_kwargs,
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)
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flow = self._vizs[data_key] = Viz(
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viz = self._vizs[data_key] = Viz(
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data_key,
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pi,
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shm,
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flume,
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is_ohlc=is_ohlc,
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# register curve graphics with this flow
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# register curve graphics with this viz
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graphics=graphics,
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)
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assert isinstance(flow.shm, ShmArray)
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assert isinstance(viz.shm, ShmArray)
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# TODO: this probably needs its own method?
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if overlay:
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@ -1321,7 +1318,7 @@ class ChartPlotWidget(pg.PlotWidget):
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# understand.
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pi.addItem(graphics)
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return flow
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return viz
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def draw_ohlc(
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self,
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@ -1446,6 +1443,7 @@ class ChartPlotWidget(pg.PlotWidget):
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r,
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last,
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) = bars_range or viz.datums_range()
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profiler(f'{self.name} got bars range')
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key = round(lbar), round(rbar)
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@ -1470,4 +1468,4 @@ class ChartPlotWidget(pg.PlotWidget):
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self,
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key: str,
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) -> Viz:
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return self._vizs[key]
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return self._vizs.get(key)
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