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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from __future__ import annotations
import random
from PySide6.QtCharts import QChart, QSplineSeries, QValueAxis
from PySide6.QtCore import Qt, QTimer, Slot
from PySide6.QtGui import QPen
class Chart(QChart):
def __init__(self, parent=None):
super().__init__(QChart.ChartTypeCartesian, parent, Qt.WindowFlags())
self._timer = QTimer()
self._series = QSplineSeries(self)
self._titles = []
self._axisX = QValueAxis()
self._axisY = QValueAxis()
self._step = 0
self._x = 5
self._y = 1
self._timer.timeout.connect(self.handleTimeout)
self._timer.setInterval(1000)
green = QPen(Qt.red)
green.setWidth(3)
self._series.setPen(green)
self._series.append(self._x, self._y)
self.addSeries(self._series)
self.addAxis(self._axisX, Qt.AlignBottom)
self.addAxis(self._axisY, Qt.AlignLeft)
self._series.attachAxis(self._axisX)
self._series.attachAxis(self._axisY)
self._axisX.setTickCount(5)
self._axisX.setRange(0, 10)
self._axisY.setRange(-5, 10)
self._timer.start()
@Slot()
def handleTimeout(self):
x = self.plotArea().width() / self._axisX.tickCount()
y = (self._axisX.max() - self._axisX.min()) / self._axisX.tickCount()
self._x += y
self._y = random.uniform(0, 5) - 2.5
self._series.append(self._x, self._y)
self.scroll(x, 0)
if self._x == 100:
self._timer.stop()
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