57.11 Groups🔗ℹ

A group is a semantic composite Visual. Its child list is stored in significant back-to-front order. Child positions are local to the group anchor. A child can itself be a group, so transforms can be nested.

During rendering, the group rotation and uniform scale are inherited by each child. The group translation places the complete composite in its parent coordinate system. Child opacity is applied to each child, and group opacity is applied to the complete composed result. Thus, opacity values multiply through nested groups.

Groups contain model values only. They do not contain Picts or renderer callbacks. The Pict adapter composes their children recursively and passes the same explicit renderer list to every descendant.