Kivy Garden Graph绘图异常与应用退出按钮技术咨询

Hey there! Let's tackle your two questions about your calculation game app:

1. Why isn't dummy_series being plotted, even though axes (ticks and labels) display correctly? #

Since your relevant code lives in the StatisticScreen and Plot modules, here are the most common culprits to investigate:

• Empty or unassigned data: Double-check that dummy_series actually contains valid data. If it's a pandas Series or similar structure, verify len(dummy_series) > 0 and that there are no unexpected NaN values that might cause the plotter to skip rendering.
• Series not added to the plot widget: If you're using a library like Kivy Garden Plot, you need to explicitly add your series to the plot instance. For example:

  self.plot.add_series(dummy_series)
  

  Without this step, the series exists but isn't attached to the visible plot canvas.
• Invisible styling: It's possible the series color matches the plot background perfectly, making it seem like it's not drawn. Test with a high-contrast color (e.g., color=(1, 0, 0, 1) for bright red) to rule this out.
• Data outside axis bounds: Even if axes show up, your dummy_series data might lie outside the current visible axis range. Try enabling auto-scaling (like plt.autoscale() for matplotlib, or setting xmin/xmax/ymin/ymax to match your data's min/max values in Kivy Plot) to ensure the data is in view.
• Missing redraw trigger: If you update dummy_series after initializing the plot, you might need to force a canvas refresh. In Kivy, call self.plot.canvas.ask_update(); for matplotlib, use plt.draw() or fig.canvas.draw_idle() to render the updated data.

2. Exit button functionality (resolved) #

Awesome that you found the solution! Using App.get_running_app().stop() is the standard and correct way to exit a Kivy application. You don't need to manually remove all widgets first—this method stops the main event loop, which is the proper reverse operation to AppObject.run(). It cleanly terminates the app without leaving lingering processes.

内容的提问来源于stack exchange，提问作者J. Katzer