气轻PyQt5 35 QChart坐标轴(QValueAxis)

 

在【气轻PyQt5 34】中制作了一条曲线，但纵坐标的数据显示似乎有些问题。为了改善显示效果对纵坐标进行了QValueAxis设置。axis_y.setLabelFormat("%d")中的"%d"有许多变化，与c语言中的函数fprintf的格式类似，比如%4.2f等等。

 

from PyQt5.QtGui import *

from PyQt5.QtCore import *

from PyQt5.QtWidgets import *

from PyQt5.QtChart import QSplineSeries, QLineSeries, QChart, QChartView, QValueAxis, QBarCategoryAxis

from math import ceil

import sys

 

class PyQt535(QMainWindow):

    def __init__(self):

        super().__init__()

        self.initUI()

 

    def initUI(self):

        self.setWindowTitle("chart")

        self.resize(600, 400)                           # 设置窗口大小

 

        gdpData  = [30319.98, 18809.64, 32679.87, 12820.4, 13509.15,

                    12001.52, 22859.35, 24221.98, 20363.19, 15342.77]

        MaxGDP = ceil(max(gdpData)/9)*10

 

        chart = QChart()                                # 图表组件

        chart.setTitle("GDP")

 

        spline = QSplineSeries()                        # 样条曲线

        for i, value in enumerate(gdpData):

            spline.append(i, value)

 

        spline.setName("2018年部分城市GDP")

        spline.setColor(Qt.blue)

               

        chart.addSeries(spline)                         # 添加Series

 

        axis_y = QValueAxis()

        axis_y.setLabelFormat("%d")

        axis_y.setRange(0, MaxGDP)

        axis_y.setTitleText("亿元")

        chart.addAxis(axis_y, Qt.AlignLeft)

        spline.attachAxis(axis_y)

 

        chartView = QChartView()                        # 视图组件

        chartView.setChart(chart)                       # 显示chart

       

        self.setCentralWidget(chartView)

 

        self.show()

 

if __name__ == '__main__':

    app = QApplication(sys.argv)

    window = PyQt535()

    sys.exit(app.exec())

 

执行结果