[英]How can I clear or overwrite a tkinter canvas?
下面的代码显示了我目前正在处理的 tkinter GUI 的一页。
我希望“清除绘图字段”按钮执行的操作是它所说的:清除画布,因为如果我再次绘图,新绘图将打包在下方。
或:我如何覆盖现有的情节,这样我才能摆脱按钮本身?
class PlotPage(tk.Frame):
"""Page containing the matplotlib graphs"""
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
label = ttk.Label(self, text="PlotPage", font=LARGE_FONT)
label.pack(pady=5)
button1 = ttk.Button(self, text="Back to Start Page", command=lambda: controller.show_frame(StartPage))
button1.pack(pady=5)
buttonPlot = ttk.Button(self, text="Show Plot", command=self.plot)
buttonPlot.pack(pady=5)
buttonClear = ttk.Button(self, text="Clear Plot Field", command=lambda: controller.show_frame(PlotPage))
buttonClear.pack(pady=5)
def plot(self):
"""generate a simple matplotlib graph for multiple profiles"""
f = Figure(figsize=(8,4), dpi=100)
a = f.add_subplot(111)
for profile in listofProfiles:
X_list=profile.indexList
Y_list=profile.VL_List
[...] Some lines related to plotting [...]
a.plot(X_list, Y_list, lw=0.3,)
canvas = FigureCanvasTkAgg(f, self)
canvas.show()
canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=True)
toolbar = NavigationToolbar2TkAgg(canvas, self)
toolbar.update()
canvas._tkcanvas.pack(side=tk.TOP, fill=tk.BOTH, expand=True)
print("Stuff has been plotted")
def clearPlotPage(self):
"""cleares the whole plot field"""
# ???
print("Plot Page has been cleared")
我会destroy()
画布,然后重新运行plot()
。 为此,您需要使canvas
成为类似self.canvas
这样的类属性。 现在我们有了class属性,您的任何方法都可以使用self.canvas
而不会出现问题。
看一下我根据您的问题修改的这段代码,如果您有任何问题,请告诉我。
class PlotPage(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.canvas = None
label = ttk.Label(self, text="PlotPage", font=LARGE_FONT)
label.pack(pady=5)
button1 = ttk.Button(self, text="Back to Start Page", command=lambda: controller.show_frame(StartPage))
button1.pack(pady=5)
buttonPlot = ttk.Button(self, text="Show Plot", command=self.plot)
buttonPlot.pack(pady=5)
buttonClear = ttk.Button(self, text="Clear Plot Field", command=lambda: controller.show_frame(PlotPage))
buttonClear.pack(pady=5)
def plot(self):
if self.canvas == None:
f = Figure(figsize=(8,4), dpi=100)
a = f.add_subplot(111)
for profile in listofProfiles:
X_list=profile.indexList
Y_list=profile.VL_List
# [...] Some lines related to plotting [...]
a.plot(X_list, Y_list, lw=0.3,)
self.canvas = FigureCanvasTkAgg(f, self)
self.canvas.show()
self.canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=True)
toolbar = NavigationToolbar2TkAgg(self.canvas, self)
toolbar.update()
self.canvas._tkcanvas.pack(side=tk.TOP, fill=tk.BOTH, expand=True)
print("Stuff has been plotted")
else:
print("Plot already plotted please clear first")
def clearPlotPage(self):
self.canvas.destroy()
self.canvas = None
self.plot()
print("Plot Page has been cleared")
对于仍在处理AttributeError的任何人:'FigureCanvasTkAgg'对象没有属性'destroy'。
我通过创建一个“虚拟”容器框架来包装FigureCanvas来解决此问题,该框架可以销毁,从而销毁FigureCanvas。
请分享您创建的用于包装图形画布的容器框架的代码
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