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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[MNT]: Move norms to from colors.py to separate file norms.py","articleBody":"### Summary\r\n\r\nCurrently the data→norm→color pipeline involves two files:\r\n1. `colors.py`:\r\n    1. Utility functions for working with colors\r\n    2. `Colormap` and subclasses of `Colormap` \r\n    3. `Normalize` and subclasses of `Normalize`\r\n2. `cm.py`:\r\n    1. The colormap registry\r\n    2. `ScalarMappable` (holds data, norm and colormap)\r\n\r\nIn this structure, each file contains multiple parts of the pipeline, and it is not intuitive which part of the pipeline is located where.\r\n\r\nWith PR #28658 we are creating `colorizer.py` and the new `Colorizer` object to improve the data→norm→color pipeline.\r\nThis has the added benefit that it greatly simplifies `cm.py`, which now only contains the colormap registry (and ScalarMappable for compatibility reasons). \r\n\r\n### Proposed fix\r\n\r\nThis issue suggests moving the norms to a separate file in order to clean up `colors.py`. This, together with  #28658 would lead to the following structure:\r\n\r\n1. `colors.py`:\r\n    1. Utility functions for working with colors\r\n    2. `Colormap` and subclasses of `Colormap` \r\n2. `norms.py`\r\n    1. `Normalize` and subclasses of `Normalize`\r\n2. `cm.py`:\r\n    1. The colormap registry\r\n3. `colorizer.py`\r\n    1. `Colorizer` (handles the data→norm→color pipeline)\r\n\r\nWith this structure, each file only contains a single part of the pipeline. \r\n\r\nThis issue came up because I was looking to implement multivariate color mapping (see issue #14168, and PRs #28454, #28658, [#28428]) , and for this we will need at least one more norm (i.e. `MultiNorm`). ","author":{"url":"https://github.com/trygvrad","@type":"Person","name":"trygvrad"},"datePublished":"2024-08-09T08:20:05.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":18},"url":"https://github.com/28690/matplotlib/issues/28690"}