SceneViewState

SceneViewState — a snapshot of a SceneView's pan / zoom / rotation, suitable for persistence between sessions.

Pattern

use teksilo_scene::{Scene, SceneView, SceneViewState};

// On load: read from your persistence layer (teksilo-settings,
// a custom JSON file, etc.) and pass to SceneView.
let saved: SceneViewState = my_settings.scene_view.get();
let view = SceneView::new(scene);
view.restore_state(saved);

// On exit / periodic flush: snapshot and persist.
let current: SceneViewState = view.state();
my_settings.scene_view.set(current);

Why a plain struct, not Serialize

teksilo-scene deliberately doesn't depend on serde. Apps that want to persist via teksilo-settings (which is serde-based) either:

• Add their own newtype wrapper that implements Serialize / Deserialize, OR
• Store the fields individually (pan_x, pan_y, zoom, rotation) as scalar SettingsKey<f32>s in a SettingsStore.

The struct is plain-old-data — manual round-trip is trivial.

Builder methods at a glance

IDENTITY, pan, is_identity

API reference

📖 Full rustdoc API for this module

pub struct SceneViewState

Snapshot of a SceneView's view transform: pan offset, zoom factor, and rotation in radians. Use SceneView::state to capture the current values; SceneView::restore_state to apply a saved snapshot.

#![allow(unused)]
fn main() {
pub struct SceneViewState { /* fields */ }
}

Methods

pub const IDENTITY: SceneViewState = SceneViewState { pan_x: 0.0, pan_y: 0.0, zoom: 1.0, rotation: 0.0, };

The identity view state: no pan, zoom 1.0, no rotation.

pub fn new(pan: Vec2, zoom: f32, rotation: f32) -> Self

Construct a new state with the given pan / zoom / rotation.

pub fn pan(&self) -> Vec2

Pan offset as a Vec2.

pub fn is_identity(&self) -> bool

Whether this state is the identity (no pan, zoom 1.0, no rotation). Useful for skipping persistence of fresh-default SceneViews.