René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[ENH]: Position artists (particularly Annotations) relative to multiple other artists","articleBody":"### Problem\r\n\r\nCurrently we can position text relative to a single artist, as described in https://matplotlib.org/stable/tutorials/text/annotations.html?highlight=complex%20coordinate#using-complex-coordinates-with-annotations.\r\n\r\nI would like to position texts relative to *multiple* artists.  For instance, let's consider two text artists, `txt1` positioned at (0.5,0.25) and `txt2` (.5,0.75). Assume they are left-aligned and of width 0.1, so the left edge of each of their bbox is at 0.5, the right edge is at 0.6, and assume that `txt2` at (.5,0.75) is top-aligned, so the top of its bbox is 0.75, and `txt1` is bottom-aligned, so the bottom of its bbox is 0.25. \r\n\r\nI would like some function `combine_artists(txt1,txt2)` that returns an object that combines the coordinate systems of `txt1` and `txt2` so that an artist can be positioned relative to the *combined bbox*. For instance, I would like to position some artist `txt3` that is vertically centered between `txt1` and `txt2`. Its data coordinate is (0.5,0.5), but its relative position coordinate in the combined `txt1+txt2` space would be (0,0.5).\r\n\r\n### Proposed solution\r\n\r\nThere may already be a way to do this in the library, as it seems transforms are addable. What remains then is making the interface to creating the combined bbox/transform in a way that is easily accessible. I already tried just adding the transforms of the `txt1` and `txt2`, which seemed like the most intuitive way for this to work.","author":{"url":"https://github.com/stanleyjs","@type":"Person","name":"stanleyjs"},"datePublished":"2022-01-12T23:29:15.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/22223/matplotlib/issues/22223"}