| | ========================= |
| | MEP29: Text light markup |
| | ========================= |
| |
|
| | .. contents:: |
| | :local: |
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| | Status |
| | ====== |
| |
|
| | Discussion |
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| |
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| | Branches and Pull requests |
| | ========================== |
| |
|
| | None at the moment, proof of concept only. |
| |
|
| | Abstract |
| | ======== |
| |
|
| | This MEP proposes to add lightweight markup to the text artist. |
| |
|
| | Detailed description |
| | ==================== |
| |
|
| | Using different size/color/family in a text annotation is difficult because the |
| | `~.Axes.text` method accepts argument for size/color/family/weight/etc. that are used |
| | for the whole text. But, if one wants, for example, to have different colors, |
| | one has to look at the gallery where one such example is provided: |
| | :doc:`/gallery/text_labels_and_annotations/rainbow_text` |
| |
|
| | This example takes a list of strings as well as a list of colors which makes it |
| | cumbersome to use. An alternative would be to use a restricted set of pango_-like markup and to interpret this markup. |
| |
|
| | .. _pango: https://docs.gtk.org/Pango/pango_markup.html#pango-markup |
| |
|
| | Some markup examples:: |
| | |
| | Hello <b>world!</b>` |
| | Hello <span color="blue">world!</span> |
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| |
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| | Implementation |
| | ============== |
| |
|
| | A proof of concept is provided in `markup_example.py <https://github.com/rougier/matplotlib/blob/markup/examples/text_labels_and_annotations/markup.py>`_ but it currently only handles the horizontal direction. |
| |
|
| | Improvements |
| | ------------ |
| |
|
| | * This proof of concept uses regex to parse the text but it may be better |
| | to use the html.parser from the standard library. |
| |
|
| | * Computation of text fragment positions could benefit from the OffsetFrom |
| | class. See for example item 5 in `Using Complex Coordinates with Annotations <https://matplotlib.org/devdocs/users/explain/text/annotations.html#using-complex-coordinates-with-annotations>`_ |
| |
|
| | Problems |
| | -------- |
| |
|
| | * One serious problem is how to deal with text having both LaTeX and |
| | HTML-like tags. For example, consider the following:: |
| | |
| | $<b>Bold$</b> |
| |
|
| | Recommendation would be to have mutual exclusion. |
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| | Backward compatibility |
| | ====================== |
| |
|
| | None at the moment since it is only a proof of concept |
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| | Alternatives |
| | ============ |
| |
|
| | As proposed by @anntzer, this could be also implemented as improvements to |
| | mathtext. For example:: |
| | |
| | r"$\text{Hello \textbf{world}}$" |
| | r"$\text{Hello \textcolor{blue}{world}}$" |
| | r"$\text{Hello \textsf{\small world}}$" |
| |
|
