对数刻度轴示例

该示例演示了如何使用 QLogValueAxis。

下载 此示例

logvalueaxis.py

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

"""PySide6 port of the Logarithmic Axis Example from Qt v5.x"""


import sys
from PySide6.QtCore import Qt, QPointF
from PySide6.QtGui import QPainter
from PySide6.QtWidgets import QMainWindow, QApplication
from PySide6.QtCharts import (QChart, QChartView, QLineSeries, QLogValueAxis,
                              QValueAxis)


class TestChart(QMainWindow):
    def __init__(self):
        super().__init__()

        self.series = QLineSeries()
        self.series.append([
            QPointF(1.0, 1.0), QPointF(2.0, 73.0), QPointF(3.0, 268.0),
            QPointF(4.0, 17.0), QPointF(5.0, 4325.0), QPointF(6.0, 723.0)])

        self.chart = QChart()
        self.chart.addSeries(self.series)
        self.chart.legend().hide()
        self.chart.setTitle("Logarithmic axis example")

        self._axis_x = QValueAxis()
        self._axis_x.setTitleText("Data point")
        self._axis_x.setLabelFormat("%i")
        self._axis_x.setTickCount(self.series.count())
        self.chart.addAxis(self._axis_x, Qt.AlignBottom)
        self.series.attachAxis(self._axis_x)

        self._axis_y = QLogValueAxis()
        self._axis_y.setTitleText("Values")
        self._axis_y.setLabelFormat("%g")
        self._axis_y.setBase(8.0)
        self._axis_y.setMinorTickCount(-1)
        self.chart.addAxis(self._axis_y, Qt.AlignLeft)
        self.series.attachAxis(self._axis_y)

        self._chart_view = QChartView(self.chart)
        self._chart_view.setRenderHint(QPainter.Antialiasing)

        self.setCentralWidget(self._chart_view)


if __name__ == "__main__":
    app = QApplication(sys.argv)

    window = TestChart()
    window.show()
    window.resize(800, 600)

    sys.exit(app.exec())