Struct SceneGraph 

pub struct SceneGraph { /* private fields */ }

Arena-based scene graph with generational indices.

Implementations

impl SceneGraph

pub fn new() -> SceneGraph

Create an empty scene graph.

pub fn with_root() -> SceneGraph

Create a scene graph with a root container node.

pub fn root(&self) -> Option<NodeId>

The root node, if any.

pub fn set_root(&mut self, id: NodeId)

Set the root node.

pub fn insert(&mut self, node: Node) -> NodeId

Insert a node into the arena, returning its ID.

pub fn remove(&mut self, id: NodeId) -> Option<Node>

Remove a node by ID. Returns the node if it existed.

pub fn get(&self, id: NodeId) -> Option<&Node>

Get a reference to a node.

pub fn get_mut(&mut self, id: NodeId) -> Option<&mut Node>

Get a mutable reference to a node.

pub fn add_child(&mut self, parent: NodeId, child: NodeId)

Add a child to a parent node.

pub fn insert_child(&mut self, parent: NodeId, node: Node) -> NodeId

Insert a node as a child of parent.

pub fn len(&self) -> usize

Number of live nodes.

pub fn is_empty(&self) -> bool

Whether the graph is empty.

pub fn iter(&self) -> impl Iterator<Item = (NodeId, &Node)>

Iterate over all live (NodeId, &Node) pairs.

pub fn world_transform(&self, id: NodeId) -> Affine2D

Compute the world transform for a node by walking up the parent chain.

pub fn collect_marks(&self) -> Vec<(NodeId, Affine2D)>

Collect all leaf marks in z-order (depth-first, sorted by z_order within siblings).

Trait Implementations

impl Default for SceneGraph

fn default() -> SceneGraph

Returns the “default value” for a type.