Python 使用PyQt滚动区域缩放子地块

有没有办法为动态数量的子批次设置一英寸的固定高度？我所做的是创建了一个函数，它定义了一个缩放因子，该因子根据子地块的数量显示子地块大约一英寸，但当我超出模型函数的范围或一次添加一个子地块时，问题就会出现。有没有一个更优雅的解决方案，总是给我一个精确的英寸？谢谢你的帮助。代码取自

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是否希望每个子批次的高度为1英寸？是的，每个子批次的高度应正好为1英寸。

from PyQt4 import QtGui, QtCore
import sys
import matplotlib

from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg
from matplotlib.figure                  import Figure


class Canvas(FigureCanvasQTAgg):

    def __init__(self, parent=None):
        self.figure = Figure()
        super(Canvas, self).__init__(self.figure)

        self.ax1 = self.figure.add_subplot(1,1,1)
        self.figure.subplots_adjust(left = 0.05, bottom = 0.02, right = 0.98, top = 0.99)
        self.setMinimumWidth(1000)
        self.ax1.plot([1,2,3])
        self.draw()

    def add_subplot(self, data=[]):
        rows = len(self.figure.axes) + 1
        for index, axes in enumerate(self.figure.axes, start=1):
            axes.change_geometry(rows, 1, index)

        ax = self.figure.add_subplot(rows, 1, index+1)
        ax.plot(data)
        ax.patch.set_facecolor('None')
        self.figure.set_figheight(self.figure.get_figheight()*self.figScalingfactor)

    def figScaling(self, numSubplot):
        self.figScalingfactor = round(1.1729*pow(numSubplot, -0.028),3)


class Window(QtGui.QMainWindow):

    def __init__(self):
        super(Window, self).__init__()

        self.showMaximized()
        self.widget = QtGui.QWidget()
        self.setCentralWidget(self.widget)
        self.widget.setLayout(QtGui.QVBoxLayout())
        self.widget.layout().setContentsMargins(0,0,0,0)
        self.widget.layout().setSpacing(5)

        self.canvas = Canvas(self)
        self.scroll = QtGui.QScrollArea(self.widget)
        self.scroll.setWidget(self.canvas)
        self.scroll.setWidgetResizable(False)
        self.numSubplots = 50
        self.canvas.figScaling(self.numSubplots)

        for x in range(self.numSubplots):
            self.canvas.add_subplot()
            self.canvas.adjustSize()
        self.canvas.draw()
        self.widget.layout().addWidget(self.scroll)

def main():
    app = QtGui.QApplication(sys.argv)
    app.aboutToQuit.connect(app.deleteLater)
    GUI = Window()
    GUI.show()
    sys.exit(app.exec_())

if __name__ == "__main__":
    main()