Add UltraLayout: Advanced constraint-based positioning for non-orthogonal subplot arrangements #430
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cvanelteren
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Closes #297
This PR introduces UltraLayout, a novel constraint-based layout system using kiwisolver that enables aesthetically pleasing positioning for non-orthogonal subplot arrangements (e.g.,
[[1, 1, 2, 2], [0, 3, 3, 0]]where subplot 3 should be centered between subplots 1 and 2). The existing gridspec works great for orthogonal layouts but fails to produce visually balanced results when subplots span multiple rows/columns in non-aligned ways. UltraLayout automatically detects non-orthogonal layouts, applies constraint satisfaction to compute optimal positions that respect spacing, ratios, and aesthetic balance (e.g., centering subplots between neighbors), and gracefully falls back to the standard grid layout if kiwisolver is not installed or for orthogonal arrangements. This enhancement is fully backward compatible, adds zero overhead for standard grid layouts, includes comprehensive test coverage inultraplot/tests/test_ultralayout.py, and provides a foundation for more sophisticated layout constraints in the future.