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Code Issues 4 Pull Requests 6 Packages Projects Releases Wiki Activity

Only update history on bar increment 

With the improved update logic on `BarsItems` it doesn't seem to be
necessary. Remove y sticky for overlays for now to avoid clutter that
looks like double draws when the last overlay value is close to the last
price.
bar_select
Tyler Goodlet 2020-10-22 21:21:14 -04:00
parent 8eb4344d86
commit 13f32acfdf
1 changed files with 16 additions and 15 deletions
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31
piker/ui/_chart.py
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@ -496,6 +496,10 @@ class ChartPlotWidget(pg.PlotWidget):
else: else:
label.anchor(itemPos=(0, 0), parentPos=(0, 0), offset=(0, -4)) label.anchor(itemPos=(0, 0), parentPos=(0, 0), offset=(0, -4))
# TODO: something instead of stickies for overlays
# (we need something that avoids clutter on x-axis).
self._add_sticky(name)
def update(index: int) -> None: def update(index: int) -> None:
data = self._array[index][name] data = self._array[index][name]
label.setText(f"{name}: {data:.2f}") label.setText(f"{name}: {data:.2f}")
@ -506,7 +510,6 @@ class ChartPlotWidget(pg.PlotWidget):
self._labels[name] = (label, update) self._labels[name] = (label, update)
self._update_contents_label(len(data) - 1) self._update_contents_label(len(data) - 1)
self._add_sticky(name)
if self._cursor: if self._cursor:
self._cursor.add_curve_cursor(self, curve) self._cursor.add_curve_cursor(self, curve)
@ -642,7 +645,7 @@ class ChartPlotWidget(pg.PlotWidget):
# on startup labels might not yet be rendered # on startup labels might not yet be rendered
top, bottom = (vb.mapToView(tl).y(), vb.mapToView(br).y()) top, bottom = (vb.mapToView(tl).y(), vb.mapToView(br).y())
# XXX: hack, how do we compute exactly? # XXX: magic hack, how do we compute exactly?
label_h = (top - bottom) * 0.42 label_h = (top - bottom) * 0.42
except np.linalg.LinAlgError: except np.linalg.LinAlgError:
@ -946,27 +949,25 @@ async def check_for_new_bars(feed, ohlcv, linked_charts):
async for index in await feed.index_stream(): async for index in await feed.index_stream():
# update chart historical bars graphics # update chart historical bars graphics
# When appending a new bar, in the time between the insert
# here and the Qt render call the underlying price data may
# have already been updated, thus make sure to also update
# the last bar if necessary on this render cycle which is
# why we **don't** set: just_history=True
price_chart.update_ohlc_from_array( price_chart.update_ohlc_from_array(
price_chart.name, price_chart.name, ohlcv.array, just_history=True)
ohlcv.array,
# When appending a new bar, in the time between the insert
# here and the Qt render call the underlying price data may
# have already been updated, thus make sure to also update
# the last bar if necessary on this render cycle which is
# why we **don't** set:
# just_history=True
)
# resize view # resize view
# price_chart._set_yrange() # price_chart._set_yrange()
for name, curve in price_chart._overlays.items(): for name, curve in price_chart._overlays.items():
# TODO: standard api for signal lookups per plot # TODO: standard api for signal lookups per plot
if name in price_chart._array.dtype.fields: if name in price_chart._array.dtype.fields:
# should have already been incremented above # should have already been incremented above
price_chart.update_curve_from_array( price_chart.update_curve_from_array(name, price_chart._array)
name,
price_chart._array,
)
for name, chart in linked_charts.subplots.items(): for name, chart in linked_charts.subplots.items():
chart.update_curve_from_array(chart.name, chart._shm.array) chart.update_curve_from_array(chart.name, chart._shm.array)