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Input Physics

Feature: physics.

[dependencies]
animato = { version = "1.7.2", features = ["physics"] }

Inertia

use animato::{Inertia, InertiaConfig, Update};

let mut inertia = Inertia::new(InertiaConfig::smooth());
inertia.kick(600.0);
inertia.update(1.0 / 60.0);
assert!(inertia.position() > 0.0);

Drag

use animato::{DragConstraints, DragState, PointerData};

let mut drag = DragState::new([0.0, 0.0])
    .constraints(DragConstraints::bounded(0.0, 300.0, 0.0, 200.0));

drag.on_pointer_down(PointerData::new(0.0, 0.0, 1));
drag.on_pointer_move(PointerData::new(100.0, 25.0, 1), 1.0 / 60.0);
assert!(drag.position()[0] > 0.0);
let release = drag.on_pointer_up(PointerData::new(100.0, 25.0, 1));
assert!(release.is_some());

Gestures

use animato::{Gesture, GestureRecognizer, PointerData};

let mut gestures = GestureRecognizer::default();
gestures.on_pointer_down(PointerData::new(0.0, 0.0, 1), 0.0);
let gesture = gestures.on_pointer_up(PointerData::new(80.0, 0.0, 1), 0.2);
assert!(matches!(gesture, Some(Gesture::Swipe { .. })));

Notes

  • PointerData::pointer_id keeps concurrent input streams isolated.
  • Bounds clamp position and zero velocity on that axis.
  • DragState uses velocity smoothing to avoid noisy release inertia.

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