filter
Filters a CompositionNode and its hierarchy based on the provided filter function. The method recursively applies the filter to the node and its children, creating a new hierarchy that contains only the nodes for which the filter returns true. If the filter condition fails for the root node, null is returned.
For GroupNode instances, the method applies the filter to its children and creates a new GroupNode containing filtered children that satisfy the filter condition. For ShapeNode instances, a copy is created if the filter condition is met.
Return
A new filtered CompositionNode tree, or null if the root node does not pass the filter.
Parameters
A lambda function that takes a CompositionNode and returns a Boolean. The function determines if a node should be included in the resulting hierarchy.