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Add commented ex. code for line price charts

to_qpainterpath_and_beyond
Tyler Goodlet 2020-11-13 12:33:59 -05:00
parent acf8aeb33e
commit bfcf5170dc
1 changed files with 22 additions and 2 deletions
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24
piker/ui/_chart.py
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@ -123,6 +123,7 @@ class ChartSpace(QtGui.QWidget):
self, self,
symbol: str, symbol: str,
data: np.ndarray, data: np.ndarray,
ohlc: bool = True,
) -> None: ) -> None:
"""Load a new contract into the charting app. """Load a new contract into the charting app.
""" """
@ -147,7 +148,7 @@ class ChartSpace(QtGui.QWidget):
if not self.v_layout.isEmpty(): if not self.v_layout.isEmpty():
self.v_layout.removeWidget(linkedcharts) self.v_layout.removeWidget(linkedcharts)
main_chart = linkedcharts.plot_main(s, data) main_chart = linkedcharts.plot_main(s, data, ohlc=ohlc)
self.v_layout.addWidget(linkedcharts) self.v_layout.addWidget(linkedcharts)
return linkedcharts, main_chart return linkedcharts, main_chart
@ -234,7 +235,7 @@ class LinkedSplitCharts(QtGui.QWidget):
name=symbol.key, name=symbol.key,
array=array, array=array,
xaxis=self.xaxis, xaxis=self.xaxis,
ohlc=True, ohlc=ohlc,
_is_main=True, _is_main=True,
) )
# add crosshair graphic # add crosshair graphic
@ -746,6 +747,15 @@ async def _async_main(
ohlcv = feed.shm ohlcv = feed.shm
bars = ohlcv.array bars = ohlcv.array
# TODO: when we start messing with line charts
# c = np.zeros(len(bars), dtype=[
# (sym, bars.dtype.fields['close'][0]),
# ('index', 'i4'),
# ])
# c[sym] = bars['close']
# c['index'] = bars['index']
# linked_charts, chart = chart_app.load_symbol(sym, c, ohlc=False)
# load in symbol's ohlc data # load in symbol's ohlc data
linked_charts, chart = chart_app.load_symbol(sym, bars) linked_charts, chart = chart_app.load_symbol(sym, bars)
@ -849,6 +859,11 @@ async def chart_from_quotes(
l, lbar, rbar, r = last_bars_range l, lbar, rbar, r = last_bars_range
in_view = array[lbar:rbar] in_view = array[lbar:rbar]
mx, mn = np.nanmax(in_view['high']), np.nanmin(in_view['low']) mx, mn = np.nanmax(in_view['high']), np.nanmin(in_view['low'])
# TODO: when we start using line charts
# sym = chart.name
# mx, mn = np.nanmax(in_view[sym]), np.nanmin(in_view[sym])
return last_bars_range, mx, mn return last_bars_range, mx, mn
last_bars_range, last_mx, last_mn = maxmin() last_bars_range, last_mx, last_mn = maxmin()
@ -898,6 +913,11 @@ async def chart_from_quotes(
array, array,
) )
# chart.update_curve_from_array(
# chart.name,
# TODO: when we start using line charts
# np.array(array['close'], dtype=[(chart.name, 'f8')])
# if vwap_in_history: # if vwap_in_history:
# # update vwap overlay line # # update vwap overlay line
# chart.update_curve_from_array('vwap', ohlcv.array) # chart.update_curve_from_array('vwap', ohlcv.array)