动态样条曲线示例

此示例展示了如何绘制动态数据。

您可以在此处检查此示例的简单动画。

下载 此 示例

chart.py

# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

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()

main.py

# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

"""PySide6 port of the Dynamic Spline example from Qt v5.x"""
import sys

from PySide6.QtCharts import QChart, QChartView
from PySide6.QtGui import QPainter
from PySide6.QtWidgets import QApplication, QMainWindow

from chart import Chart

if __name__ == "__main__":

    a = QApplication(sys.argv)
    window = QMainWindow()
    chart = Chart()
    chart.setTitle("Dynamic spline chart")
    chart.legend().hide()
    chart.setAnimationOptions(QChart.AllAnimations)
    chart_view = QChartView(chart)
    chart_view.setRenderHint(QPainter.Antialiasing)
    window.setCentralWidget(chart_view)
    window.resize(400, 300)
    window.show()

    sys.exit(a.exec())