动态图表缩放，QChart

请始终提供一个可重现性最低的示例来说明问题。还应该有一个时间表。如果你能以某种方式展示你想要得到的东西，那就太好了。

您的更改和添加应该在问题正文中，而不是在评论中。

我不确定我的理解是否正确，但在我看来，作为替代方案，它可能看起来像这样：

import sys
'''                                                            #  PySide6
from PySide6.QtCore import *
from PySide6.QtWidgets import *
from PySide6.QtCharts import *
from PySide6.QtGui import *
'''
from PyQt5 import QtWidgets, QtGui, QtCore                     #  PyQt5
from PyQt5.Qt import *
from PyQt5.QtChart import *


class MySpinBox(QWidget):
    def __init__(self):
        super().__init__()
# ?     # экземпляр класса графика, через него надо менять масштаб
# ?     self.chart = MyChart() 
        self.spinBox = QSpinBox()
        self.spinBox.setRange(-15, 15)
        vbox = QVBoxLayout(self)
        vbox.addWidget(self.spinBox)


class MyChart(QWidget):
    def __init__(self):
        super().__init__()

        self.chart_view = QChartView()
        self.chart_view.setRubberBand(QChartView.RectangleRubberBand)
        self.chart_view.setRenderHint(QPainter.Antialiasing)

        chart = QChart()
        chart.setAnimationOptions(QChart.SeriesAnimations)

        series = QLineSeries()
        mas = [
            1.33, 1.15, 1.55, 1.65, 1.64, 1.91, 1.33, 2.3, 1.5, 1.35, 
            2.52, 1.77, 1.7, 1.87, 2.0, 1.55, 1.73, 2.1, 1.33, 1.15, 
            1.55, 1.92, 1.64, 1.91, 1.33, 1.71, 1.5, 1.35, 1.22, 1.77, 
            1.7, 1.87, 2.7, 1.55, 1.73, 2.1,
        ]
        for i in range(0, len(mas)):
            series.append(QtCore.QPointF(i, mas[i]))

        chart.addSeries(series)
        
        self.axis_x = QValueAxis()
        chart.addAxis(self.axis_x, Qt.AlignBottom)
        series.attachAxis(self.axis_x)
        self.axis_y = QValueAxis()
        chart.addAxis(self.axis_y, Qt.AlignLeft)
        series.attachAxis(self.axis_y)
        self.chart_view.setChart(chart)
    
        layout = QVBoxLayout(self)        
        layout.addWidget(self.chart_view)

        chart.legend().setMarkerShape(QLegend.MarkerShapeCircle);
        self.chart_view.setRenderHint(QPainter.Antialiasing);
        self.chart_view.setRubberBand(QChartView.RectangleRubberBand);
        

class Main(QWidget):
    def __init__(self):
        super().__init__()
        
        self.chart = MyChart()
        
        self.mySpinBox = MySpinBox()
        self.mySpinBox.spinBox.valueChanged.connect(self.value_changed)
        
        vbox = QVBoxLayout(self)
        vbox.addWidget(self.chart)
        vbox.addWidget(self.mySpinBox)

# +++ vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
        self.value = 0                                                # +
        self.zoomFactor = 1.1                                         # +
        
    def value_changed(self, value):
        _value = value - self.value
        self.value = value 
        
        if _value == 1:                          # or Qt.Key_Plus:
            self.chart.chart_view.chart().zoom(self.zoomFactor) 
        elif _value == -1:                       # or Qt.Key_Minus:
            self.chart.chart_view.chart().zoom(1 / self.zoomFactor)
#+ or  
    def keyPressEvent(self, keyEvent):
        key = keyEvent.key()
        if key == Qt.Key_Equal:                             # ----> `=`
            self.chart.chart_view.chart().zoomReset()
            self.mySpinBox.spinBox.setValue(0)
        # ...    
# +++ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = Main()
    window.show()
    sys.exit(app.exec())