PyQt5+QtChart实现绘制区域图

2022-12-16 12:00

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PyQt5 QtChart-区域图

QAreaSeries用于创建区域图数据，传入两个QLineSeries对象。核心代码：

series0 = QLineSeries()
series1 = QLineSeries()
area = QAreaSeries(series0, series1)

示例代码

import sys
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import Qt
from PyQt5.QtChart import QAreaSeries, QLineSeries, QSplineSeries, QValueAxis, QChart, QChartView


class MyAreaWindow(QWidget):
    def __init__(self, parent=None):
        super(MyAreaWindow, self).__init__(parent)
        self.setWindowTitle("区域图")
        chart = QChart()
        chartView = QChartView()
        
        # 创建Series
        series0 = QLineSeries()
        series1 = QLineSeries()

        # 添加数据
        series0 << QPointF(1, 5) << QPointF(3, 7) << QPointF(7, 6) << QPointF(9, 7) \
        << QPointF(12, 6) << QPointF(16, 7) << QPointF(18, 5)
        series1 << QPointF(1, 3) << QPointF(3, 4) << QPointF(7, 3) << QPointF(8, 2) \
        << QPointF(12, 3) << QPointF(16, 4) << QPointF(18, 3)

        # 创建区域图
        area = QAreaSeries(series0, series1)
        area.setName("面积")

        # 设置画笔, pen用于画区域的边框
        pen = QPen(Qt.red)
        pen.setWidth(3)
        area.setPen(pen)

        # 设置画刷,brush用于填充区域
        brush = QBrush(Qt.yellow)
        area.setBrush(brush)

        # gradient = QLinearGradient(QPointF(0, 0), QPointF(0, 1))
        # gradient.setColorAt(0.0, QColor(0x3cc63c))
        # gradient.setColorAt(1.0, QColor(0x16f626))
        # gradient.setCoordinateMode(QGradient.ObjectBoundingMode)
        # area.setBrush(gradient)

        chart.addSeries(area)
        chart.createDefaultAxes()
        chart.axisX().setRange(0, 20)
        chart.axisY().setRange(0, 10)

        chartView.setChart(chart)
        chartView.setRenderHint(QPainter.Antialiasing)

        vbox = QVBoxLayout()
        vbox.addWidget(chartView)
        self.setLayout(vbox)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    win = MyAreaWindow()
    win.show()
    sys.exit(app.exec_())

效果图

补充

当然除了上面的方法，小编还为大家准备了另一种可以实现区域图绘制的方法，希望对大家有所帮助

import sys
from PyQt5.QtCore import Qt, QPointF
from PyQt5.QtGui import QPainter, QPen, QLinearGradient, QColor
from PyQt5.QtWidgets import QApplication, QMainWindow
from  PyQt5.QtChart import QChartView, QChart, QLineSeries, QAreaSeries
 
class DemoChartArea(QMainWindow):
    def __init__(self, parent=None):
        super(DemoChartArea, self).__init__(parent)   
        
         # 设置窗口标题
        self.setWindowTitle('实战 Qt for Python: QChart面积图演示')      
        # 设置窗口大小
        self.resize(480, 360)
        
        self.createChart()
        
    def createChart(self):
        
        #面积图的上下两条曲线
        #注意line0和line1的生存周期!!!!!
        self.line0 = QLineSeries()
        self.line1 = QLineSeries()
        
        self.line0 << QPointF(1, 5) << QPointF(3, 7) << QPointF(7, 6) << QPointF(9, 7) << QPointF(12, 6) << QPointF(16, 7) << QPointF(18, 5)
        self.line1 << QPointF(1, 3) << QPointF(3, 4) << QPointF(7, 3) << QPointF(8, 2) << QPointF(12, 3) << QPointF(16, 4) << QPointF(18, 3)
        
        #面积图
        areaSeries = QAreaSeries(self.line0, self.line1)
        areaSeries.setName('蝙蝠侠') #Batman
        
        pen = QPen(QColor(0x059605))
        pen.setWidth(3)
        areaSeries.setPen(pen)
        
        #渐变设置
        gradient = QLinearGradient(QPointF(0,0), QPointF(0, 1))
        gradient.setColorAt(0.0, QColor(0x3cc63c))
        gradient.setColorAt(1.0, QColor(0x26f626))
        gradient.setCoordinateMode(QLinearGradient.ObjectBoundingMode)
        areaSeries.setBrush(gradient)
              
        #创建图表
        chart = QChart()
        chart.addSeries(areaSeries)
        chart.setTitle('简单面积图示例')
        chart.createDefaultAxes()
        chart.axes(Qt.Horizontal)[0].setRange(0, 20) #横坐标数值范围
        chart.axes(Qt.Vertical)[0].setRange(0, 10) #纵坐标数值范围
         
        #图表视图
        chartView = QChartView(chart)
        chartView.setRenderHint(QPainter.Antialiasing)
        
        self.setCentralWidget(chartView)
      
        
if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = DemoChartArea()
    window.show()
    sys.exit(app.exec())

效果图