René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: ax.relim() ignores scatter artist","articleBody":"### Bug summary\n\n**ax.relim()** completely ignores changes to scatterplots with **.set_offsets()**.\n\n### Code for reproduction\n\n```Python\nimport tkinter as tk\nfrom matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2Tk\nfrom matplotlib.figure import Figure\nimport numpy as np\n\nclass App:\n    def __init__(self, root):\n        self.root = root\n        fig = Figure(figsize=(5, 5), dpi=100)\n        self.ax = fig.add_subplot(111)\n\n        self.canvas = FigureCanvasTkAgg(fig, root)\n        self.canvas.get_tk_widget().pack(fill=\"both\", expand=True)\n\n        self.toolbar = NavigationToolbar2Tk(self.canvas, root)\n\n        # Create artists once\n        self.scatter = self.ax.scatter([], [])\n        self.line, = self.ax.plot([], [])\n\n        root.after(1000, self.update_plot)\n\n    def update_plot(self):\n        # New data every update\n        xs = np.linspace(0, 10, 100)\n        ys = np.sin(xs) + np.random.normal(scale=0.1, size=100)\n\n        # Update artists\n        self.scatter.set_offsets(np.column_stack((xs, ys)))\n        #self.line.set_data(xs, ys) #Uncomment this to see the expected behaviour\n\n        # Autoscale (not working)\n        self.ax.relim()\n        self.ax.autoscale_view()\n\n        self.canvas.draw_idle()\n\n        # Keep updating\n        self.root.after(1000, self.update_plot)\n\nroot = tk.Tk()\nApp(root)\nroot.mainloop()\n```\n\n### Actual outcome\n\n\u003cimg width=\"502\" height=\"574\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/320471a2-82d4-4263-aaa8-913feaf154e7\" /\u003e\n\n### Expected outcome\n\n\u003cimg width=\"502\" height=\"574\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/9e3c9f7f-0506-4725-94d7-31baa68088ae\" /\u003e\n\n### Additional information\n\n_No response_\n\n### Operating system\n\nWindows\n\n### Matplotlib Version\n\n3.9.1\n\n### Matplotlib Backend\n\ntkAgg\n\n### Python version\n\n3.11.9\n\n### Jupyter version\n\nNone\n\n### Installation\n\npip","author":{"url":"https://github.com/CyfralCoot","@type":"Person","name":"CyfralCoot"},"datePublished":"2025-12-15T05:40:16.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/30859/matplotlib/issues/30859"}