PyQt5+QtChart实现绘制曲线图
作者:SongYuLong的博客
QChart是一个QGraphicScene中可以显示的QGraphicsWidget。本文将利用QtChart实现曲线图的绘制,文中的示例代码讲解详细,感兴趣的小伙伴可以了解一下
QSplineSeries
QSplineSeries类将数据序列显示为曲线图。核心代码:
spline = QSplineSeries()
spline.append(0, 23)
spline.append(1, 56)
…
chart.addSeries(lineSeries)
常用方法
- setPointsVisible(True) :设置数据点显示状态
- setPointLabelsVisible(True):设置数据点标签显示状态
- setPointLabelsFormat(“(@xPoint, @yPoint)”):设置数据点标签格式
- setPointLabelsFont(QFont(None, 8)) :设置数据点标签字体
- setPointLabelsColor(QColor(255, 0,0)) :设置数据点标签颜色
实现代码
import random import sys from PyQt5.QtGui import * from PyQt5.QtCore import * from PyQt5.QtWidgets import * from PyQt5.QtCore import Qt from PyQt5.QtChart import QSplineSeries, QLineSeries, QChart, QChartView, QValueAxis class MySplineWindow(QWidget): def __init__(self, parent=None): super(MySplineWindow, self).__init__(parent) self.setWindowTitle("曲线图表演示") chart = QChart() chart.setTitle("曲线图表") chart.setAnimationDuration(1500) chart.setAnimationOptions(QChart.SeriesAnimations) chart.setAnimationEasingCurve(QEasingCurve.OutCirc) chart.legend().show() spline = QSplineSeries() for value in range(1, 50): spline.append(value, round(random.random()*100)) spline.setName("随机噪声") # spline.setColor(Qt.blue) spline.setPointsVisible(True) spline.setPointLabelsVisible(True) spline.setPointLabelsFormat("(@xPoint, @yPoint)") spline.setPointLabelsFont(QFont(None, 6)) spline.setPointLabelsColor(Qt.darkBlue) chart.addSeries(spline) chart.createDefaultAxes() axis_x = QValueAxis() axis_x.setLabelFormat("%d") chart.addAxis(axis_x, Qt.AlignBottom) spline.attachAxis(axis_x) chartView = QChartView() chartView.setChart(chart) chartView.setRenderHint(QPainter.Antialiasing) vbox = QVBoxLayout() vbox.addWidget(chartView) self.setLayout(vbox) if __name__ == "__main__": app = QApplication(sys.argv) win = MySplineWindow() win.show() sys.exit(app.exec_())
效果图
增加抗锯齿:chartView.setRenderHint(QPainter.Antialiasing)
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