如果图形被刷新，FigureCanvasTkAgg 会调整大小

Question

我正在研究嵌入在 Python 中的 tkinter gui 中的 matplotlib 图。

首先创建一个FigureCanvasTkAgg，其中包括一个先前创建的对象，该对象包含一个matplotlib图形，然后绘制它。这部分工作得很好。 之后我想根据用户操作刷新画布/它的内容。如果调用刷新画布的方法，则刷新图形对象并重新绘制画布。 这也有效，图形已更新，但由于某种奇怪的原因，画布调整了大小，因此它缩小到原始大小的四分之一左右。如果我打印画布的大小，我可以看到它的大小发生了变化。

我尝试在刷新后将画布调整回原来的大小，但没有成功。

感谢您的任何意见。我添加了我的代码的缩短版本。

    #canvas object which is displayed on the gui
    class Canvas:
        def __init__(self, parent):
            #the map_figure object is create
            self.map_figure = map_figure()
            #the matplotlib figure is extracted from the map_figure
            self.figure = self.map_figure.get_figure()
            #the canvas is created using the figure and the parent
            self.canvas = FigureCanvasTkAgg(self.figure, master=parent)
            #I tried both, to manually set the canvas size to the window dimensions (which are
            #described by w and h and using the .pack() parameters, both are working fine
            self.canvas.get_tk_widget().config(width=w,height=h)
            #self.canvas.get_tk_widget().pack(fill='both', expand=True)
            self.canvas.get_tk_widget().pack()
            #canvas is drawn
            self.canvas.draw()
            #its size is printed
            print(self.get_size())

       def refresh(self, parent, point):
            #the map_figure of the canvas is refresh
            self.map_figure.refresh(data)
            #the matplotlib figure is extracted  again
            self.canvas.figure = self.map_figure.get_figure()
            #canvas is redrawn
            self.canvas.draw()
            #the canvas size is now different for some reason even after calling 
            #self.canvas.get_tk_widget().config(width=w,height=h) before this again
            print(self.canvas.get_width_height())

    #the map_figure class if relevant
    class map_figure:
        def __init__(self, data):
            self.figure = self.create_figure(data)

        def get_figure(self):
            return self.figure

        def create_figure(self, data): 
            #creating a matplotlib figure, closing if there was one before
            plt.close(fig=None)
            fig = plt.figure()
            #creating a figure using the data here
            return fig

        #refreshing the figure using new data
        def refresh(self, data):
            self.figure = self.create_figure(data)

这里还有两张图片来可视化我的问题：

之前

之后

Answer 1

clf()

您可以将其清除，而不是每次刷新时都关闭它：

def create_figure(self, date): 
    #creating a matplotlib figure, closing if there was one before
    try:
        self.figure.clf()
        fig = self.figure
    except:
        fig = plt.figure()
    #creating a figure using the data here
    ...