Trait Scene

Source

pub trait Scene: Send + Sync {
    // Required method
    fn render(&self, context: &SceneContext<'_>) -> Node;

    // Provided methods
    fn validate(&self) -> Result<()> { ... }
    fn duration(&self) -> Option<Duration> { ... }
    fn with_duration(self, duration: Duration) -> WithDuration<Self>
       where Self: Sized { ... }
}

Expand description

A stateless scene evaluated from explicit authoring inputs.

Closures implement this canonical root crate::Scene protocol.

use motion_core::prelude::*;
use motion_core::{
    DisplayList, RasterLimits, ResourceStore, ValidatedDisplayList, MAX_PATH_VERBS,
    MAX_STROKE_VERBS, MAX_SVG_PATH_BYTES, sample_offsets,
};

let child = (|context: &SceneContext<'_>| {
    assert_eq!(context.time(), 1.seconds().after_origin());
    assert_eq!(context.global_time(), 2.seconds().after_origin());
    Node::from(Rect::new(0.0, 0.0, 32.0, 24.0).fill(Color::rgb(20, 150, 125)))
})
.with_duration(2.seconds());
let cache = SceneCache::new(0);
let context = SceneContext::new(
    2.seconds().after_origin(),
    fps!(30),
    Size::new(640.0, 360.0),
    &cache,
);
let node = context.during(Time::ZERO, 4.seconds(), |local| {
    local.embed(&child, 1.seconds().after_origin())
});
let frame = node.compile(
    context.size(),
    PixelSize::new(64, 36),
    ValidationLimits::default(),
)?;