Move drawing and resize behavior into chart widget
Tyler Goodlet
parent
d8ca799504
commit
ac389c30d9
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@ -66,14 +66,14 @@ class PriceAxis(pg.AxisItem):
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def __init__(self):
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super().__init__(orientation='right')
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# self.setStyle(**{
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# 'textFillLimits': [(0, 0.8)],
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# # 'tickTextWidth': 5,
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# # 'tickTextHeight': 5,
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# # 'autoExpandTextSpace': True,
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# # 'maxTickLength': -20,
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# })
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# self.setLabel(**{'font-size':'10pt'})
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self.setStyle(**{
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'textFillLimits': [(0, 0.8)],
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# 'tickTextWidth': 5,
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# 'tickTextHeight': 5,
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# 'autoExpandTextSpace': True,
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# 'maxTickLength': -20,
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})
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self.setLabel(**{'font-size': '10pt'})
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self.setTickFont(_font)
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# XXX: drop for now since it just eats up h space
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@ -224,6 +224,8 @@ class XAxisLabel(AxisLabel):
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def tick_to_string(self, tick_pos):
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# TODO: change to actual period
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tpl = self.parent.tick_tpl['D1']
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if tick_pos > len(Quotes):
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return 'Unknown Time'
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return fromtimestamp(Quotes[round(tick_pos)].time).strftime(tpl)
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def boundingRect(self): # noqa
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@ -280,50 +282,6 @@ class ChartView(pg.ViewBox):
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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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@ -343,10 +301,11 @@ class ChartView(pg.ViewBox):
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s = 1.02 ** (ev.delta() * self.state['wheelScaleFactor'])
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s = [(None if m is False else s) for m in mask]
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# XXX: scroll "around" the right most element in the view
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# center = pg.Point(
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# fn.invertQTransform(self.childGroup.transform()).map(ev.pos())
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# )
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# XXX: scroll "around" the right most element in the view
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furthest_right_coord = self.boundingRect().topRight()
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center = pg.Point(
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fn.invertQTransform(
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@ -372,10 +331,130 @@ class ChartPlotWidget(pg.PlotWidget):
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(Could be replaced with a ``pg.GraphicsLayoutWidget`` if we
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eventually want multiple plots managed together).
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"""
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sig_mouse_leave = QtCore.Signal(object)
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sig_mouse_enter = QtCore.Signal(object)
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def __init__(
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self,
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split_charts,
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**kwargs,
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# parent=None,
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# background='default',
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# plotItem=None,
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# **kargs
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):
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"""Configure chart display settings.
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"""
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super().__init__(**kwargs)
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# label = pg.LabelItem(justify='left')
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# self.addItem(label)
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# label.setText("Yo yoyo")
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# label.setText("<span style='font-size: 12pt'>x=")
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self.parent = split_charts
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# show only right side axes
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self.hideAxis('left')
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self.showAxis('right')
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# show background grid
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self.showGrid(x=True, y=True, alpha=0.4)
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# use cross-hair for cursor
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self.setCursor(QtCore.Qt.CrossCursor)
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# set panning limits
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min_points_to_show = 20
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min_bars_in_view = 10
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max_lookahead = min_points_to_show - min_bars_in_view
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last = Quotes[-1].id
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self.setLimits(
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xMin=Quotes[0].id,
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xMax=last + max_lookahead,
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minXRange=min_points_to_show,
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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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# show last 50 points on startup
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self.plotItem.vb.setXRange(last - 50, last + max_lookahead)
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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.sigXRangeChanged.connect(self._update_yrange_limits)
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self._update_yrange_limits()
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def bars_range(self):
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"""Return a range tuple for the bars present in view.
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"""
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vr = self.viewRect()
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lbar, rbar = int(vr.left()), int(min(vr.right(), len(Quotes) - 1))
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return lbar, rbar
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def draw_ohlc(
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self,
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style: ChartType = ChartType.BAR,
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) -> None:
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"""Draw OHLC datums to chart.
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"""
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# adds all bar/candle graphics objects for each
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# data point in the np array buffer to
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# be drawn on next render cycle
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self.addItem(_get_chart_points(style))
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def draw_curve(
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self,
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data: np.ndarray,
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) -> None:
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# draw the indicator as a plain curve
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curve = pg.PlotDataItem(data, antialias=True)
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ind_chart.addItem(curve)
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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
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chart_parent = self.parent
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lbar, rbar = self.bars_range()
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# vr = 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 enterEvent(self, ev): # noqa
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# pg.PlotWidget.enterEvent(self, ev)
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self.sig_mouse_enter.emit(self)
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@ -525,7 +604,7 @@ class CrossHairItem(pg.GraphicsObject):
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evt_post=pos, point_view=mouse_point_ind
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)
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else:
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# vertial position of the mouse is inside and main chart
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# vertial position of the mouse is inside the main chart
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self.hline.setY(mouse_point.y())
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self.yaxis_label.update_label(
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evt_post=pos, point_view=mouse_point
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@ -627,66 +706,6 @@ class CandlestickItem(BarItem):
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p.drawRects(*rects[Quotes.close < Quotes.open])
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def _configure_chart(
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chart: ChartPlotWidget,
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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=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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# show background grid
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chart.showGrid(x=True, y=True, alpha=0.4)
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# use cross-hair for cursor
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chart.setCursor(QtCore.Qt.CrossCursor)
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def _configure_quotes_chart(
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chart: ChartPlotWidget,
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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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_configure_chart(chart)
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# adds all bar/candle graphics objects for each
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# data point in the np array buffer to
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# be drawn on next render cycle
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chart.addItem(_get_chart_points(style))
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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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curve = pg.PlotDataItem(d, pen='b', antialias=True)
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ind_chart.addItem(curve)
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# XXX: never do this lol
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# ind.setAspectLocked(1)
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class SplitterChart(QtGui.QWidget):
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long_pen = pg.mkPen('#006000')
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@ -711,12 +730,12 @@ class SplitterChart(QtGui.QWidget):
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else:
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self.xaxis_ind.setStyle(showValues=False)
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self.layout = QtGui.QVBoxLayout(self)
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self.layout.setContentsMargins(0, 0, 0, 0)
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self.splitter = QtGui.QSplitter(QtCore.Qt.Vertical)
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self.splitter.setHandleWidth(5)
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self.layout = QtGui.QVBoxLayout(self)
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self.layout.setContentsMargins(0, 0, 0, 0)
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self.layout.addWidget(self.splitter)
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def _show_text_signals(self, lbar, rbar):
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@ -749,6 +768,7 @@ class SplitterChart(QtGui.QWidget):
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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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split_charts=self,
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parent=self.splitter,
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axisItems={'bottom': self.xaxis, 'right': PriceAxis()},
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viewBox=ChartView,
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@ -766,6 +786,7 @@ class SplitterChart(QtGui.QWidget):
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for d in inds:
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ind = ChartPlotWidget(
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split_charts=self,
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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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@ -778,13 +799,17 @@ class SplitterChart(QtGui.QWidget):
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# self.splitter.addWidget(ind)
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self.indicators.append((ind, d))
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_configure_quotes_chart(
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self.chart,
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)
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_configure_ind_charts(
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self.indicators,
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xlink_to_chart=self.chart
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)
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self.chart.draw_ohlc()
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for ind_chart, d in self.indicators:
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# link chart x-axis to main quotes chart
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ind_chart.setXLink(self.chart)
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# XXX: never do this lol
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# ind.setAspectLocked(1)
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ind_chart.draw_curve(d)
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self._update_sizes()
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ch = CrossHairItem(
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