let player_sprite = sprite_registry.insert(SpriteData::load_from_anim_strips(
        "player",
        vec!["assets/huntress/idle.png", "assets/huntress/run.png", "assets/huntress/attack1.png"],
        View {
            x: 55,
            y: 53,
            width: 40,
            height: 50,
        },
    ));
...
    let anim_timeline = load_anim_timeline("assets/huntress/keyframes.json");

let animated_player_sprite = sprite_registry.insert(SpriteData::load_from_file("assets/huntress.json")

   pub fn current_frame(&self, strip: Range<usize>, length: f32, elapsed: f32) -> u8 {
        let dt = elapsed % length;
        let mut frame = 0;
        for f in self.0[strip].iter().rev() {
            if dt > f.time {
                frame = f.index;
                break;
            }
        }
        frame
    }

   pub fn current_frame(&self, strip: Range<usize>, length: f32, elapsed: f32) -> u8 {
        let dt = elapsed % length;
        let mut frame = 0;
        for f in self.0[strip].iter().rev() {
            if dt > f.time {
                frame = f.index;
                break;
            }
        }
        frame
    }