René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[ENH]: Built-in support for multi-color and multi-style text.","articleBody":"### Problem\n\nCreating multi-colored or multi-styled text in Matplotlib requires manual positioning of each text segment with complex spacing calculations.\nUsers currently need to calculate x-positions manually for each colored segment, which is tedious and error-prone, especially when text properties change.\n\n### Proposed solution\n\nAdd a `richtext()` function (or `ax.richtext()` method) that handles multi-color/multi-style text automatically:\n\n**Current approach (manual and tedious):**\n```python\nfig, ax = plt.subplots()\nax.text(0.1, 0.5, \"Hello\", color='red', fontsize=20)\nax.text(0.35, 0.5, \" \", fontsize=20)  # Manual spacing calculation!\nax.text(0.4, 0.5, \"World\", color='blue', fontsize=20)  # More manual work!\n```\n\n**Proposed approach (simple and automatic):**\n```python\nfig, ax = plt.subplots()\nax.richtext(0.5, 0.5,\n            strings=[\"Hello\", \" \", \"World\"],\n            colors=[\"red\", None, \"blue\"],\n            fontsize=20, ha='center', va='center')\n```\n\n**Key Features:**\n- Accepts lists of text segments with corresponding colors/styles\n- Automatically calculates spacing and positioning\n- Supports word wrapping with `box_width` parameter\n- Flexible property specification (single values, lists, or dicts)\n- Compatible with all standard matplotlib text parameters\n\n**Example Use Cases:**\n1. **Data visualization**: Highlight specific values in different colors\n2. **Scientific plots**: Format chemical formulas, mathematical notation\n3. **Publication-quality figures**: Mixed text styling in titles/labels\n\n**Implementation:**\nI've created a working proof-of-concept package: [`mpl-richtext`](https://github.com/ra8in/mpl-richtext) (also on [PyPI](https://pypi.org/project/mpl-richtext/))\n\nThe implementation:\n- Uses matplotlib's renderer for accurate text measurements\n- Creates positioned Text objects automatically\n- ~400 lines of code\n- Handles alignment, wrapping, and various text properties\n\n**Example output:**\n\n![Example](https://raw.githubusercontent.com/ra8in/mpl-richtext/master/examples/mpl_richtext_examples.png)\n\n**Questions for maintainers:**\n\n1. Is this functionality suitable for matplotlib core?\n2. Should it be a standalone function, an Axes method, or a custom Artist?\n3. Any concerns about the implementation approach?\n\nI'm willing to contribute this to matplotlib and adapt it based on maintainer feedback. Open to API redesign or implementation changes as needed.","author":{"url":"https://github.com/ra8in","@type":"Person","name":"ra8in"},"datePublished":"2025-12-22T04:10:33.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/30890/matplotlib/issues/30890"}