Currently, marks may be clipped to the extent of their immediate group parent.
In Vega, if a group mark item has clip of true, then clipping is applied to child marks (overriding their own clip preference). And the group clipping applies to marks in child groups, even if the child group does not enable clipping.
To implement this in our wgpu renderer, I think we'll need to store an independent clipping rectangle in the mark uniforms. The origin of the clipping rectangle needs to be independent of the group origin. To be correct, the clipping regions will need to be intersected if child groups of a grouping with clipping enabled also enable their own clipping.
Additionally, group clipping should take into account the rounded corners of the group mark with clipping enabled.
jonmmease
commented
6 months ago
Currently, marks may be clipped to the extent of their immediate group parent.
In Vega, if a group mark item has
clipof true, then clipping is applied to child marks (overriding their own clip preference). And the group clipping applies to marks in child groups, even if the child group does not enable clipping.To implement this in our wgpu renderer, I think we'll need to store an independent clipping rectangle in the mark uniforms. The origin of the clipping rectangle needs to be independent of the group origin. To be correct, the clipping regions will need to be intersected if child groups of a grouping with clipping enabled also enable their own clipping.
Additionally, group clipping should take into account the rounded corners of the group mark with clipping enabled.
Taken together, this is what's needed to support the rounded corners in https://altair-viz.github.io/gallery/bar_rounded.html.