Add scrolling from right and cross-hair
Modify the default ``ViewBox`` scroll to zoom behaviour such that whatever right-most point is visible is used as the "center" for zooming. Add a "traditional" cross-hair cursor.its_happening
Tyler Goodlet
parent
9d4a432757
commit
6bac250db5
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@ -39,11 +39,10 @@ def run_qtrio(
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if app is None:
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app = PyQt5.QtWidgets.QApplication([])
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# This code is from Nathaniel:
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# This is substantially faster than using a signal... for some
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# This code is from Nathaniel, and I quote:
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# "This is substantially faster than using a signal... for some
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# reason Qt signal dispatch is really slow (and relies on events
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# underneath anyway, so this is strictly less work)
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# underneath anyway, so this is strictly less work)."
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REENTER_EVENT = QtCore.QEvent.Type(QtCore.QEvent.registerEventType())
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class ReenterEvent(QtCore.QEvent):
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@ -260,32 +260,54 @@ class YAxisLabel(AxisLabel):
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self.setPos(new_pos)
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class ScrollFromRightView(pg.ViewBox):
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def wheelEvent(self, ev, axis=None):
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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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else:
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mask = self.state['mouseEnabled'][:]
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# actual scaling factor
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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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furthest_right_coord = self.boundingRect().topRight()
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center = pg.Point(
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fn.invertQTransform(self.childGroup.transform()).map(furthest_right_coord)
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)
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self._resetTarget()
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self.scaleBy(s, center)
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ev.accept()
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self.sigRangeChangedManually.emit(mask)
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# TODO: convert this to a ``ViewBox`` type giving us
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# control over mouse scrolling and a context menu
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# This is a sub-class of ``GracphicView`` which can
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# take a ``background`` color setting.
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class CustomPlotWidget(pg.PlotWidget):
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"""``GraphicsView`` subtype containing a single ``PlotItem``.
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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 wheelEvent(self, ev, axis=None):
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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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# else:
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# mask = self.state['mouseEnabled'][:]
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# # actual scaling factor
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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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# self._resetTarget()
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# self.scaleBy(s, center)
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# ev.accept()
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# self.sigRangeChangedManually.emit(mask)
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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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def leaveEvent(self, ev): # noqa
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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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@ -441,6 +463,8 @@ class CrossHairItem(pg.GraphicsObject):
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class BarItem(pg.GraphicsObject):
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# XXX: From the customGraphicsItem.py example:
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# The only required methods are paint() and boundingRect()
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w = 0.5
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@ -452,7 +476,19 @@ class BarItem(pg.GraphicsObject):
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super().__init__()
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self.generatePicture()
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# TODO: this is the routine to be retriggered for redraw
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@timeit
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def generatePicture(self):
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# pre-computing a QPicture object allows paint() to run much
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# more quickly, rather than re-drawing the shapes every time.
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self.picture = QtGui.QPicture()
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p = QtGui.QPainter(self.picture)
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self._generate(p)
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p.end()
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def _generate(self, p):
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# XXX: overloaded method to allow drawing other candle types
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high_to_low = np.array(
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[QtCore.QLineF(q.id, q.low, q.id, q.high) for q in Quotes]
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)
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@ -476,18 +512,14 @@ class BarItem(pg.GraphicsObject):
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p.setPen(self.bear_brush)
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p.drawLines(*lines[short_bars])
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# TODO: this is the routine to be retriggered for redraw
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@timeit
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def generatePicture(self):
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self.picture = QtGui.QPicture()
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p = QtGui.QPainter(self.picture)
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self._generate(p)
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p.end()
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def paint(self, p, *args):
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p.drawPicture(0, 0, self.picture)
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def boundingRect(self):
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# boundingRect _must_ indicate the entire area that will be
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# drawn on or else we will get artifacts and possibly crashing.
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# (in this case, QPicture does all the work of computing the
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# bouning rect for us)
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return QtCore.QRectF(self.picture.boundingRect())
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@ -529,7 +561,13 @@ def _configure_quotes_chart(
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chart.hideAxis('left')
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chart.showAxis('right')
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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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# 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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@ -537,8 +575,8 @@ def _configure_quotes_chart(
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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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chart.showGrid(x=True, y=True)
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chart.setCursor(QtCore.Qt.BlankCursor)
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chart.showGrid(x=True, y=True, alpha=0.4)
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chart.setCursor(QtCore.Qt.CrossCursor)
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# assign callback for rescaling y-axis automatically
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# based on y-range contents
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@ -607,6 +645,7 @@ class QuotesChart(QtGui.QWidget):
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ind.addItem(curve)
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ind.hideAxis('left')
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ind.showAxis('right')
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# XXX: never do this lol
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# ind.setAspectLocked(1)
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ind.setXLink(self.chart)
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ind.setLimits(
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@ -616,8 +655,8 @@ class QuotesChart(QtGui.QWidget):
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yMin=Quotes.open.min() * 0.98,
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yMax=Quotes.open.max() * 1.02,
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)
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ind.showGrid(x=True, y=True)
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ind.setCursor(QtCore.Qt.BlankCursor)
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ind.showGrid(x=True, y=True, alpha=0.4)
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ind.setCursor(QtCore.Qt.CrossCursor)
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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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@ -655,7 +694,8 @@ class QuotesChart(QtGui.QWidget):
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self.chart = CustomPlotWidget(
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parent=self.splitter,
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axisItems={'bottom': self.xaxis, 'right': PriceAxis()},
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enableMenu=False,
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viewBox=ScrollFromRightView,
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# enableMenu=False,
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)
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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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@ -668,7 +708,7 @@ 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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# enableMenu=False,
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)
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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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