Struct SceneGraph 

pub struct SceneGraph {
    pub graph: DiGraph<SceneNode, ()>,
    pub root: NodeIndex,
    pub styles: HashMap<NodeId, Style>,
    pub id_index: HashMap<NodeId, NodeIndex>,
}

The complete FD document — a DAG of SceneNode values.

Edges go from parent → child. Style definitions are stored separately in a hashmap for lookup by name.

Fields

graph: DiGraph<SceneNode, ()>

The underlying directed graph.

root: NodeIndex

The root node index.

styles: HashMap<NodeId, Style>

Named style definitions (style base_text { ... }).

id_index: HashMap<NodeId, NodeIndex>

Index from NodeId → NodeIndex for fast lookup.

Implementations

impl SceneGraph

pub fn new() -> Self

Create a new empty scene graph with a root node.

pub fn add_node(&mut self, parent: NodeIndex, node: SceneNode) -> NodeIndex

Add a node as a child of parent. Returns the new node’s index.

pub fn get_by_id(&self, id: NodeId) -> Option<&SceneNode>

Look up a node by its @id.

pub fn get_by_id_mut(&mut self, id: NodeId) -> Option<&mut SceneNode>

Look up a node mutably by its @id.

pub fn index_of(&self, id: NodeId) -> Option<NodeIndex>

Get the index for a NodeId.

pub fn children(&self, idx: NodeIndex) -> Vec<NodeIndex>

Get children of a node in insertion order.

pub fn define_style(&mut self, name: NodeId, style: Style)

Define a named style.

pub fn resolve_style(&self, node: &SceneNode) -> Style

Resolve a node’s effective style (merging use references + inline overrides).

pub fn rebuild_index(&mut self)

Rebuild the id_index (needed after deserialization).

Trait Implementations

impl Clone for SceneGraph

fn clone(&self) -> SceneGraph

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SceneGraph

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for SceneGraph

fn default() -> Self

Returns the “default value” for a type.