Start grouping interactions into a ``ViewBox``
Move chart resize code into our ``ViewBox`` subtype (a ``ChartView``) in an effort to start organizing interaction behaviour closer to the appropriate underlying objects. Add some docs for all this and do some renaming.its_happening
Tyler Goodlet
parent
68266f5a20
commit
ea234f4472
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@ -89,5 +89,6 @@ def run_qtrio(
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window.main_widget = main_widget
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window.setCentralWidget(instance)
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# actually render to screen
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window.show()
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app.exec_()
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@ -1,7 +1,7 @@
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"""
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Real-time quotes charting components
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"""
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from typing import Callable, List, Tuple
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from typing import List, Tuple
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import numpy as np
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import pyqtgraph as pg
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@ -13,10 +13,10 @@ from .const import ChartType
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from .portfolio import Order, Portfolio
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from .utils import fromtimestamp, timeit
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__all__ = ('QuotesChart')
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__all__ = ('SplitterChart')
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# white background for tinas like xb
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# white background (for tinas like our pal xb)
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# pg.setConfigOption('background', 'w')
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# margins
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@ -260,9 +260,79 @@ class YAxisLabel(AxisLabel):
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self.setPos(new_pos)
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class ScrollFromRightView(pg.ViewBox):
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class ChartView(pg.ViewBox):
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"""Price chart view box with interaction behaviors you'd expect from
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an interactive platform:
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- zoom on mouse scroll that auto fits y-axis
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- no vertical scrolling
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- zoom to a "fixed point" on the y-axis
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"""
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def __init__(
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self,
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parent=None,
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**kwargs,
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# invertY=False,
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):
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super().__init__(parent=parent, **kwargs)
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self.chart = parent
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# disable vertical scrolling
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self.setMouseEnabled(x=True, y=False)
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# assign callback for rescaling y-axis automatically
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# based on y-range contents
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self.chart.sigXRangeChanged.connect(self._update_yrange_limits)
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def _update_yrange_limits(self):
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"""Callback for each y-range update.
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This adds auto-scaling like zoom on the scroll wheel such
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that data always fits nicely inside the current view of the
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data set.
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"""
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# TODO: this can likely be ported in part to the built-ins:
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# self.setYRange(Quotes.low.min() * .98, Quotes.high.max() * 1.02)
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# self.setMouseEnabled(x=True, y=False)
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# self.setXRange(Quotes[0].id, Quotes[-1].id)
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# self.setAutoVisible(x=False, y=True)
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# self.enableAutoRange(x=False, y=True)
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chart = self.chart
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chart_parent = chart.parent
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vr = self.chart.viewRect()
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lbar, rbar = int(vr.left()), int(vr.right())
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if chart_parent.signals_visible:
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chart_parent._show_text_signals(lbar, rbar)
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bars = Quotes[lbar:rbar]
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ylow = bars.low.min() * 0.98
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yhigh = bars.high.max() * 1.02
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std = np.std(bars.close)
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chart.setLimits(yMin=ylow, yMax=yhigh, minYRange=std)
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chart.setYRange(ylow, yhigh)
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for i, d in chart_parent.indicators:
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# ydata = i.plotItem.items[0].getData()[1]
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ydata = d[lbar:rbar]
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ylow = ydata.min() * 0.98
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yhigh = ydata.max() * 1.02
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std = np.std(ydata)
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i.setLimits(yMin=ylow, yMax=yhigh, minYRange=std)
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i.setYRange(ylow, yhigh)
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def wheelEvent(self, ev, axis=None):
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"""Override "center-point" location for scrolling.
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This is an override of the ``ViewBox`` method simply changing
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the center of the zoom to be the y-axis.
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TODO: PR a method into ``pyqtgraph`` to make this configurable
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"""
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if axis in (0, 1):
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mask = [False, False]
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mask[axis] = self.state['mouseEnabled'][axis]
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@ -307,11 +377,11 @@ class ChartPlotWidget(pg.PlotWidget):
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sig_mouse_enter = QtCore.Signal(object)
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def enterEvent(self, ev): # noqa
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pg.PlotWidget.enterEvent(self, ev)
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# pg.PlotWidget.enterEvent(self, ev)
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self.sig_mouse_enter.emit(self)
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def leaveEvent(self, ev): # noqa
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pg.PlotWidget.leaveEvent(self, ev)
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# pg.PlotWidget.leaveEvent(self, ev)
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self.sig_mouse_leave.emit(self)
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self.scene().leaveEvent(ev)
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@ -562,16 +632,19 @@ def _configure_chart(
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) -> None:
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"""Configure a chart with common settings.
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"""
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# show only right side axes
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chart.hideAxis('left')
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chart.showAxis('right')
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# highest = Quotes.high.max() * 1.02
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# lowest = Quotes.low.min() * 0.98
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# set panning limits
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chart.setLimits(
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xMin=Quotes[0].id,
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xMax=Quotes[-1].id,
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minXRange=60,
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minXRange=40,
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# maxYRange=highest-lowest,
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yMin=Quotes.low.min() * 0.98,
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yMax=Quotes.high.max() * 1.02,
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)
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@ -584,8 +657,7 @@ def _configure_chart(
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def _configure_quotes_chart(
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chart: ChartPlotWidget,
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style: ChartType,
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update_yrange_limits: Callable,
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style: ChartType = ChartType.BAR,
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) -> None:
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"""Update and format a chart with quotes data.
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"""
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@ -596,19 +668,15 @@ def _configure_quotes_chart(
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# be drawn on next render cycle
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chart.addItem(_get_chart_points(style))
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# assign callback for rescaling y-axis automatically
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# based on y-range contents
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# TODO: this can likely be ported to built-in: .enableAutoRange()
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# but needs testing
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chart.sigXRangeChanged.connect(update_yrange_limits)
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def _configure_ind_charts(
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indicators: List[Tuple[ChartPlotWidget, np.ndarray]],
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xlink_to_chart: ChartPlotWidget,
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) -> None:
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for ind_chart, d in indicators:
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# link chart x-axis to main quotes chart
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ind_chart.setXLink(xlink_to_chart)
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# default config
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_configure_chart(ind_chart)
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@ -618,11 +686,8 @@ def _configure_ind_charts(
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# XXX: never do this lol
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# ind.setAspectLocked(1)
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# link chart x-axis to main quotes chart
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ind_chart.setXLink(xlink_to_chart)
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class QuotesChart(QtGui.QWidget):
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class SplitterChart(QtGui.QWidget):
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long_pen = pg.mkPen('#006000')
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long_brush = pg.mkBrush('#00ff00')
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@ -634,7 +699,6 @@ class QuotesChart(QtGui.QWidget):
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def __init__(self):
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super().__init__()
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self.signals_visible = False
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self.style = ChartType.BAR
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self.indicators = []
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self.xaxis = FromTimeFieldDateAxis(orientation='bottom')
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@ -677,44 +741,23 @@ class QuotesChart(QtGui.QWidget):
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self.signals_visible = False
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def _update_sizes(self):
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min_h_ind = int(self.height() * 0.3 / len(self.indicators))
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sizes = [int(self.height() * 0.7)]
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min_h_ind = int(self.height() * 0.2 / len(self.indicators))
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sizes = [int(self.height() * 0.8)]
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sizes.extend([min_h_ind] * len(self.indicators))
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self.splitter.setSizes(sizes) # , int(self.height()*0.2)
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def _update_yrange_limits(self):
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"""Callback for each y-range update.
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"""
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vr = self.chart.viewRect()
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lbar, rbar = int(vr.left()), int(vr.right())
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if self.signals_visible:
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self._show_text_signals(lbar, rbar)
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bars = Quotes[lbar:rbar]
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ylow = bars.low.min() * 0.98
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yhigh = bars.high.max() * 1.02
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std = np.std(bars.close)
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self.chart.setLimits(yMin=ylow, yMax=yhigh, minYRange=std)
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self.chart.setYRange(ylow, yhigh)
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for i, d in self.indicators:
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# ydata = i.plotItem.items[0].getData()[1]
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ydata = d[lbar:rbar]
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ylow = ydata.min() * 0.98
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yhigh = ydata.max() * 1.02
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std = np.std(ydata)
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i.setLimits(yMin=ylow, yMax=yhigh, minYRange=std)
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i.setYRange(ylow, yhigh)
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def plot(self, symbol):
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self.digits = symbol.digits
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self.chart = ChartPlotWidget(
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parent=self.splitter,
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axisItems={'bottom': self.xaxis, 'right': PriceAxis()},
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viewBox=ScrollFromRightView,
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viewBox=ChartView,
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# enableMenu=False,
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)
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# TODO: ``pyqtgraph`` doesn't pass through a parent to the
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# ``PlotItem`` by default; maybe we should PR this in?
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self.chart.plotItem.parent = self
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self.chart.getPlotItem().setContentsMargins(*CHART_MARGINS)
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self.chart.setFrameStyle(QtGui.QFrame.StyledPanel | QtGui.QFrame.Plain)
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@ -726,8 +769,10 @@ class QuotesChart(QtGui.QWidget):
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parent=self.splitter,
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axisItems={'bottom': self.xaxis_ind, 'right': PriceAxis()},
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# axisItems={'top': self.xaxis_ind, 'right': PriceAxis()},
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# enableMenu=False,
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viewBox=ChartView,
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)
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ind.plotItem.parent = self
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ind.setFrameStyle(QtGui.QFrame.StyledPanel | QtGui.QFrame.Plain)
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ind.getPlotItem().setContentsMargins(*CHART_MARGINS)
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# self.splitter.addWidget(ind)
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@ -735,8 +780,6 @@ class QuotesChart(QtGui.QWidget):
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_configure_quotes_chart(
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self.chart,
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self.style,
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self._update_yrange_limits
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)
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_configure_ind_charts(
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self.indicators,
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