Can Plt Subplots Figsize Resize Subplots On Interactive Backends?

2025-09-04 03:31:16 333

3 Answers

Parker
Parker
2025-09-07 13:14:49
I love tinkering with plots during live demos, and this question pops up all the time. The short practical rule I use: figsize determines the figure's starting size, interactive backends let the window (and thus the figure canvas) change, and axes scale because their positions are relative to the figure. So yes — subplots do resize on interactive backends.

But if your subplot arrangement uses fixed spacing or you depend on tight spacing, you may notice odd gaps or overlapped labels after resizing. To handle that, I often create the figure with constrained_layout=True which tries to keep labels and ticks from overlapping automatically. If that doesn’t cut it, I attach a small handler: fig.canvas.mpl_connect('resize_event', lambda event: fig.tight_layout() or fig.canvas.draw_idle()). Also fig.set_size_inches(new_w, new_h) is handy if you want to programmatically change size, followed by fig.canvas.draw(). For presentation setups I sometimes call figManager.window.showMaximized() or use the figure manager to control the GUI window directly.

So, interactive backends are friendly for dynamic resizing, but be ready to call tight_layout or constrained_layout or a resize callback when layout fidelity matters.
Abigail
Abigail
2025-09-07 23:45:01
Yep — the practical behavior is that plt.subplots(figsize=(...)) only sets the initial size, but on interactive backends the figure window can be resized and the canvas pixels change, which makes subplots scale because their coordinates are normalized to the figure. That means axes and plotted content stretch or shrink with the window.

If you want neatly adjusted spacing after resizing, use constrained_layout=True when creating the figure, or call fig.tight_layout() inside a resize handler. You can also change size programmatically with fig.set_size_inches(width, height) and force an update with fig.canvas.draw() or fig.canvas.draw_idle(). Note that some complex layouts (fixed aspect ratios, anchored artists) might not behave perfectly without extra callbacks, so adding fig.canvas.mpl_connect('resize_event', handler) where you recompute layout is a robust approach.
Vivian
Vivian
2025-09-09 22:31:19
Oh, this is one of those tiny plotting details that trips people up at first, but once you see how Matplotlib behaves it starts to make sense. When you call plt.subplots(figsize=(w, h)) you are setting the initial size of the Figure in inches. On interactive backends (like Qt5Agg, TkAgg, etc.) the figure lives inside a resizable GUI window, and when that window changes size the canvas pixel dimensions change too. Because Matplotlib places axes and subplots using normalized figure coordinates, the axes themselves scale with the window, so visually the subplots do resize as the window is resized.

That said, there are caveats. figsize is a stored property for the figure and reflects the current figure size in inches; it was set initially but can update if the window is resized (since inches = pixels / dpi). However, spacing between subplots (margins, padding) is not always recomputed automatically in the way you might expect. If you need spacing recalculated on resize, use constrained_layout=True when creating the figure or call fig.tight_layout() after a resize. For full control you can register a resize callback with fig.canvas.mpl_connect('resize_event', callback) and inside the callback call fig.set_size_inches(...) or fig.tight_layout() and then fig.canvas.draw_idle().

In short: yes, interactive backends will visually resize your subplots when the window changes, but for consistent layout behavior you may want constrained_layout, tight_layout, or a resize handler that updates spacing and forces a redraw.
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