Add initial y-axis zoom
Tyler Goodlet
parent
f3a0b1e91e
commit
81b10b9dfc
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@ -384,7 +384,6 @@ class ChartPlotWidget(pg.PlotWidget):
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# self.setViewportMargins(0, 0, 0, 0)
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self._ohlc = array # readonly view of ohlc data
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self.default_view()
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self._arrays = {} # readonly view of overlays
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self._graphics = {} # registry of underlying graphics
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@ -406,6 +405,8 @@ class ChartPlotWidget(pg.PlotWidget):
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# show background grid
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self.showGrid(x=True, y=True, alpha=0.5)
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self.default_view()
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# TODO: stick in config
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# use cross-hair for cursor?
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# self.setCursor(QtCore.Qt.CrossCursor)
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@ -478,10 +479,13 @@ class ChartPlotWidget(pg.PlotWidget):
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"""
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xlast = self._ohlc[index]['index']
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print(xlast)
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begin = xlast - _bars_to_left_in_follow_mode
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end = xlast + _bars_from_right_in_follow_mode
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# remove any custom user yrange setttings
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if self._static_yrange == 'axis':
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self._static_yrange = None
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self.plotItem.vb.setXRange(
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min=begin,
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max=end,
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@ -697,7 +701,12 @@ class ChartPlotWidget(pg.PlotWidget):
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data set.
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"""
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if self._static_yrange is not None:
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set_range = True
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if self._static_yrange == 'axis':
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set_range = False
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elif self._static_yrange is not None:
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ylow, yhigh = self._static_yrange
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elif yrange is not None:
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@ -761,11 +770,19 @@ class ChartPlotWidget(pg.PlotWidget):
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ylow = np.nanmin(bars)
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yhigh = np.nanmax(bars)
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if set_range:
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# view margins: stay within a % of the "true range"
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diff = yhigh - ylow
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ylow = ylow - (diff * 0.04)
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yhigh = yhigh + (diff * 0.04)
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self.setLimits(
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yMin=ylow,
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yMax=yhigh,
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)
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self.setYRange(ylow, yhigh)
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# def _label_h(self, yhigh: float, ylow: float) -> float:
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# # compute contents label "height" in view terms
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# # to avoid having data "contents" overlap with them
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# if self._labels:
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@ -791,14 +808,8 @@ class ChartPlotWidget(pg.PlotWidget):
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# if label_h > yhigh - ylow:
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# label_h = 0
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# print(f"bounds (ylow, yhigh): {(ylow, yhigh)}")
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label_h = 0
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self.setLimits(
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yMin=ylow,
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yMax=yhigh + label_h,
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)
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self.setYRange(ylow, yhigh + label_h)
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# print(f"bounds (ylow, yhigh): {(ylow, yhigh)}")
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def enterEvent(self, ev): # noqa
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# pg.PlotWidget.enterEvent(self, ev)
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@ -1137,7 +1148,7 @@ async def spawn_fsps(
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"""Start an fsp subactor async.
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"""
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print(f'FSP NAME: {fsp_name}')
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# print(f'FSP NAME: {fsp_name}')
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portal = await n.run_in_actor(
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# subactor entrypoint
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@ -17,6 +17,8 @@
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"""
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UX interaction customs.
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"""
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from typing import Optional
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import pyqtgraph as pg
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from pyqtgraph import ViewBox, Point, QtCore, QtGui
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from pyqtgraph import functions as fn
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@ -144,7 +146,7 @@ class SelectRect(QtGui.QGraphicsRectItem):
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x1, x2 = start_pos.x(), end_pos.x()
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# TODO: heh, could probably use a max-min streamin algo here too
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ymn, xmn = min(y1, y2), min(x1, x2)
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_, xmn = min(y1, y2), min(x1, x2)
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ymx, xmx = max(y1, y2), max(x1, x2)
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pchng = (y2 - y1) / y1 * 100
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@ -277,7 +279,11 @@ class ChartView(ViewBox):
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ev.accept()
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self.sigRangeChangedManually.emit(mask)
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def mouseDragEvent(self, ev, axis=None):
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def mouseDragEvent(
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self,
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ev,
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axis: Optional[int] = None,
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) -> None:
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# if axis is specified, event will only affect that axis.
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ev.accept() # we accept all buttons
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@ -295,6 +301,18 @@ class ChartView(ViewBox):
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# Scale or translate based on mouse button
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if ev.button() & (QtCore.Qt.LeftButton | QtCore.Qt.MidButton):
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# zoom only y-axis when click-n-drag on it
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if axis == 1:
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# set a static y range special value on chart widget to
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# prevent sizing to data in view.
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self._chart._static_yrange = 'axis'
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scale_y = 1.3 ** (dif.y() * -1 / 20)
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self.setLimits(yMin=None, yMax=None)
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# print(scale_y)
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self.scaleBy((0, scale_y))
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if self.state['mouseMode'] == ViewBox.RectMode:
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down_pos = ev.buttonDownPos()
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@ -333,6 +351,7 @@ class ChartView(ViewBox):
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self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
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elif ev.button() & QtCore.Qt.RightButton:
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# print "vb.rightDrag"
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if self.state['aspectLocked'] is not False:
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mask[0] = 0
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