feat: reinstate title_prefix on all matplotlib subplot panel titles

[Jammy2211]

Overview

Analysis classes accept title_prefix: str = None, which is intended to prefix every matplotlib subplot panel title (e.g. "VIS " gives "VIS Data", "VIS Signal-To-Noise Map", etc. for Euclid VIS imaging). The parameter is accepted and stored in all Analysis and Plotter classes, but after a plot refactor the actual prefix logic was dropped — titles are now hardcoded strings in the *_plots.py functions, and title_prefix is never applied.

This issue reinstates the feature end-to-end.

Plan

• Add title_prefix: str = None to all subplot_* functions in PyAutoGalaxy and PyAutoLens *_plots.py files
• Inside each function apply the prefix to each panel title string before it reaches plot_array()
• Thread self.title_prefix from every Plotter method down to those function calls
• Cover all dataset types: imaging, interferometer, quantity, ellipse, galaxies, adapt (AG); imaging, interferometer, tracer, point, sensitivity, subhalo (AL)

Detailed implementation plan

Affected Repositories

• PyAutoGalaxy (primary)
• PyAutoLens

Work Classification

Library

Branch Survey

Repository	Current Branch	Dirty?
PyAutoGalaxy	main	clean
PyAutoLens	main	clean

Suggested branch: feature/title-prefix-subplots

Implementation Steps

1. PyAutoGalaxy *_plots.py — add title_prefix: str = None to each subplot_* function. Apply with _pf = lambda t: f"{title_prefix}{t}" if title_prefix else t and wrap every literal title string: _pf("Data"), _pf("Convergence"), etc. Files: imaging/plot/fit_imaging_plots.py, interferometer/plot/fit_interferometer_plots.py, quantity/plot/fit_quantity_plots.py, galaxy/plot/galaxies_plots.py, galaxy/plot/galaxy_plots.py, galaxy/plot/adapt_plots.py, ellipse/plot/fit_ellipse_plots.py.

2. PyAutoGalaxy Plotter methods — update every call to a subplot function to pass title_prefix=self.title_prefix. Files: analysis/plotter.py (galaxies, adapt_images), imaging/model/plotter.py (fit_imaging, fit_imaging_combined), interferometer/model/plotter.py, quantity/model/plotter.py, ellipse/model/plotter.py.

3. PyAutoLens *_plots.py — same pattern. Files: imaging/plot/fit_imaging_plots.py, interferometer/plot/fit_interferometer_plots.py, lens/plot/tracer_plots.py, lens/plot/sensitivity_plots.py, lens/plot/subhalo_plots.py, point/plot/fit_point_plots.py, point/plot/point_dataset_plots.py.

4. PyAutoLens Plotter methods — pass title_prefix=self.title_prefix wherever subplot functions are called.

5. Tests — add/extend unit tests that set title_prefix="TEST " and assert the prefix appears in the title= kwarg forwarded to plot_array (or by inspecting the axes title after a dry run).

Key Files

• autogalaxy/imaging/plot/fit_imaging_plots.py — primary example; subplot_fit titles "Data", "Signal-To-Noise Map", "Model Image", "Residual Map", "Normalized Residual Map", "Chi-Squared Map"
• autogalaxy/analysis/plotter.py — base Plotter class that stores self.title_prefix
• autogalaxy/imaging/model/plotter.py — PlotterImaging.fit_imaging() calls fit_imaging_plots.subplot_fit

Original Prompt

Click to expand starting prompt

Analysis classes can receive this: title_prefix: str = None, on the old code this meant the title of all figures of all images on matplotlib subplots had this suffix, for example "VIS " for euclid VIS imaging. The suffix plotting has been lost in the plot refactor, can you reinstate it?

[Jammy2211]

Shipped — 2026-04-07

PRs

• feat: add title_prefix support to subplot_imaging_dataset PyAutoArray#260
• feat: reinstate title_prefix on all matplotlib subplot panel titles #333
• feat: reinstate title_prefix on all matplotlib subplot panel titles PyAutoLens#428

Summary

Reinstated title_prefix support across all subplot plot functions in PyAutoArray, PyAutoGalaxy, and PyAutoLens. The prefix is applied with an automatic trailing space so callers can pass "VIS" or "VIS " and always get "VIS Data". The dataset.png subplot (imaging and interferometer), inversion_0_0.png, and image_with_positions.png all now receive the prefix. Over Sample Size panels in dataset.png are intentionally excluded.

Session Notes

• Fixed a secondary bug: plot_inversion_reconstruction was not passing is_subplot=True to apply_labels, causing rectangular pixelization panels to render with the wrong (oversized) title font.
• Renamed "Regularization Weights (Unzoomed)" → "Regularization (No Zoom)" and "Noise-Map (Unzoomed)" → "Noise-Map (No Zoom)" for consistency with other panel naming.