def tooltip(self, point, state):
if self.m_tooltip is None:
self.m_tooltip = Callout(self.m_chart)
if state:
self.m_tooltip.setText("X: %f \nY: %f " % (point.x(), point.y()))
self.m_tooltip.setAnchor(point)
self.m_tooltip.setZValue(11)
self.m_tooltip.updateGeometry()
self.m_tooltip.show()
else:
self.m_tooltip.hide()
def keepCallout(self):
self.m_callouts.append(self.m_tooltip)
self.m_tooltip = Callout(self.m_chart)
class View(QGraphicsView):
def __init__(self, parent=None):
super().__init__(parent)
scene = QGraphicsScene(self)
self.setScene(scene)
self.m_tooltip = None
self.m_callouts = []
self.setDragMode(QGraphicsView.NoDrag)
self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
# chart
self.m_chart = QChart()
self.m_chart.setMinimumSize(640, 480)
self.m_chart.setTitle(
"Hover the line to show callout. Click the line to make it stay"
)
self.m_chart.legend().hide()
series = QLineSeries()
series.append(1, 3)
series.append(4, 5)
series.append(5, 4.5)
series.append(7, 1)
series.append(11, 2)
self.m_chart.addSeries(series)
series2 = QSplineSeries()
series2.append(1.6, 1.4)
series2.append(2.4, 3.5)
series2.append(3.7, 2.5)
series2.append(7, 4)
series2.append(10, 2)
self.m_chart.addSeries(series2)
self.m_chart.createDefaultAxes()
self.m_chart.setAcceptHoverEvents(True)
self.setRenderHint(QPainter.Antialiasing)
self.scene().addItem(self.m_chart)
self.m_coordX = QGraphicsSimpleTextItem(self.m_chart)
self.m_coordX.setPos(
self.m_chart.size().width() / 2 - 50, self.m_chart.size().height()
)
self.m_coordX.setText("X: ")
self.m_coordY = QGraphicsSimpleTextItem(self.m_chart)
self.m_coordY.setPos(
self.m_chart.size().width() / 2 + 50, self.m_chart.size().height()
)
self.m_coordY.setText("Y: ")
series.clicked.connect(self.keepCallout)
series.hovered.connect(self.tooltip)
series2.clicked.connect(self.keepCallout)
series2.hovered.connect(self.tooltip)
self.setMouseTracking(True)
def resizeEvent(self, event):
if self.scene() is not None:
self.scene().setSceneRect(QRectF(QRect(QPoint(0, 0), event.size())))
self.m_chart.resize(QSizeF(event.size()))
self.m_coordX.setPos(
self.m_chart.size().width() / 2 - 50, self.m_chart.size().height() - 20
)
self.m_coordY.setPos(
self.m_chart.size().width() / 2 + 50, self.m_chart.size().height() - 20
)
for callout in self.m_callouts:
callout.updateGeometry()
super().resizeEvent(event)
def mouseMoveEvent(self, event):
self.m_coordX.setText("X: %f" % self.m_chart.mapToValue(event.pos()).x())
self.m_coordY.setText("Y: %f" % self.m_chart.mapToValue(event.pos()).y())
super().mouseMoveEvent(event)
def keepCallout(self):
self.m_callouts.append(self.m_tooltip)
self.m_tooltip = Callout(self.m_chart)
def tooltip(self, point, state):
if self.m_tooltip is None:
self.m_tooltip = Callout(self.m_chart)
if state:
self.m_tooltip.setText("X: %f \nY: %f " % (point.x(), point.y()))
self.m_tooltip.setAnchor(point)
self.m_tooltip.setZValue(11)
self.m_tooltip.updateGeometry()
self.m_tooltip.show()
else:
self.m_tooltip.hide()