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Commitde21925

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anntzertacaswell
authored andcommitted
Reparametrize offsetbox calculations in terms of bboxes.
Passing a single bbox instead of (xdescent, ydescent, width, height)separately is easier to follow (see e.g. the changes in VPacker andHPacker, which no longer have to repeatedly pack/unpack whd_list), andavoids having to figure out e.g. the sign of the descents and whetherwidth/height includes the descents, for example.Currently get_offset keeps a back compatible signature (we *could*consider killing the old signature but let's not do that for now), and_get_bbox_and_child_offsets is private because I *may* want to lateralso change the convention to make offsets relative to the bbox (0, 0)point rather than the bbox lower-left corner.
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``OffsetBox.get_extent_offsets`` and ``OffsetBox.get_extent``
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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... are deprecated; these methods are also deprecated on all subclasses of
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`.OffsetBox`.
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To get the offsetbox extents, instead of ``get_extent``, use
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`.OffsetBox.get_bbox`, which directly returns a `.Bbox` instance.
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To also get the child offsets, instead of ``get_extent_offsets``, separately
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call `~.OffsetBox.get_offset` on each children after triggering a draw.

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