def setupChart(self):
"""Set up the GUI's series and chart."""
# Collect x and y data values from the CSV file
x_values, y_values = self.loadCSVFile()
# Get the largest x and y values; Used for setting the chart's axes
x_max, y_max = max(x_values), max(y_values)
# Create numpy arrays from the x and y values
x_values = np.array(x_values)
y_values = np.array(y_values)
# Calculate the regression line
coefficients = linearRegression(x_values, y_values)
# Create chart object
chart = QChart()
chart.setTitle("Auto Insurance for Geographical Zones in Sweden")
chart.legend().hide()
# Create scatter series and add points to the series
scatter_series = QScatterSeries()
scatter_series.setName("DataPoints")
scatter_series.setMarkerSize(9.0)
scatter_series.hovered.connect(self.displayPointInfo)
for value in range(0, self.row_count - 1):
scatter_series.append(x_values[value], y_values[value])
scatter_series.setBorderColor(QColor('#000000'))
# Create line series and add points to the series
line_series = QLineSeries()
line_series.setName("RegressionLine")
# Calculate the regression line
for x in x_values:
y_pred = coefficients[0] + coefficients[1] * x
line_series.append(x, y_pred)
# Add both series to the chart and create x and y axes
chart.addSeries(scatter_series)
chart.addSeries(line_series)
chart.createDefaultAxes()
axis_x = chart.axes(Qt.Horizontal)
axis_x[0].setTitleText("Number of Claims")
axis_x[0].setRange(0, x_max)
axis_x[0].setLabelFormat("%i")
axis_y = chart.axes(Qt.Vertical)
axis_y[0].setTitleText(
"Total Payment in Swedish Kronor (in thousands)")
axis_y[0].setRange(0, y_max + 20)
# Create QChartView object for displaying the chart
chart_view = QChartView(chart)
v_box = QVBoxLayout()
v_box.addWidget(chart_view)
self.setLayout(v_box)
def __createChart(self): ##创建图表
chart = QChart() #创建 Chart
## chart.setTitle("简单函数曲线")
chart.legend().setVisible(True)
self.chartView.setChart(chart) #Chart添加到chartView
pen=QPen()
pen.setWidth(2)
##========LineSeries折线 和 ScatterSeries散点
seriesLine = QLineSeries()
seriesLine.setName("LineSeries折线")
seriesLine.setPointsVisible(False) #数据点不可见
pen.setColor(Qt.red)
seriesLine.setPen(pen)
seriesLine.hovered.connect(self.do_series_hovered) #信号 hovered
seriesLine.clicked.connect(self.do_series_clicked) #信号 clicked
chart.addSeries(seriesLine) #添加到chart
seriesLinePoint = QScatterSeries() #散点序列
seriesLinePoint.setName("ScatterSeries散点")
shape=QScatterSeries.MarkerShapeCircle #MarkerShapeRectangle
seriesLinePoint.setMarkerShape(shape) #散点形状，只有2种
seriesLinePoint.setBorderColor(Qt.yellow)
seriesLinePoint.setBrush(QBrush(Qt.red))
seriesLinePoint.setMarkerSize(10) #散点大小
seriesLinePoint.hovered.connect(self.do_series_hovered) #信号 hovered
seriesLinePoint.clicked.connect(self.do_series_clicked) #信号 clicked
chart.addSeries(seriesLinePoint) #添加到chart
##======== SplineSeries 曲线和 QScatterSeries 散点
seriesSpLine = QSplineSeries()
seriesSpLine.setName("SplineSeries曲线")
seriesSpLine.setPointsVisible(False) #数据点不可见
pen.setColor(Qt.blue)
seriesSpLine.setPen(pen)
seriesSpLine.hovered.connect(self.do_series_hovered) #信号 hovered
seriesSpLine.clicked.connect(self.do_series_clicked) #信号 clicked
seriesSpPoint = QScatterSeries() #散点序列
seriesSpPoint.setName("QScatterSeries")
shape=QScatterSeries.MarkerShapeRectangle #MarkerShapeCircle
seriesSpPoint.setMarkerShape(shape) #散点形状，只有2种
seriesSpPoint.setBorderColor(Qt.green)
seriesSpPoint.setBrush(QBrush(Qt.blue))
seriesSpPoint.setMarkerSize(10) #散点大小
seriesSpPoint.hovered.connect(self.do_series_hovered) #信号 hovered
seriesSpPoint.clicked.connect(self.do_series_clicked) #信号 clicked
chart.addSeries(seriesSpLine)
chart.addSeries(seriesSpPoint)
## 创建缺省坐标轴
chart.createDefaultAxes() #创建缺省坐标轴并与序列关联
chart.axisX().setTitleText("time(secs)")
chart.axisX().setRange(0,10)
chart.axisX().applyNiceNumbers()
chart.axisY().setTitleText("value")
chart.axisY().setRange(-2,2)
chart.axisY().applyNiceNumbers()
for marker in chart.legend().markers(): #QLegendMarker类型列表
marker.clicked.connect(self.do_LegendMarkerClicked)
