use std::f64::consts::PI; use ranim::{    anims::{creation::WritingAnim, fading::FadingAnim, morph::MorphAnim},    color::palettes::manim,    items::vitem::{        VItem,        geometry::{Circle, Square},    },    prelude::*,    utils::rate_functions::smooth,}; #[scene]pub fn hello_ranim(r: &mut RanimScene) {    let mut square = Square::new(2.0).with(|square| {        square.set_color(manim::BLUE_C);    });     let mut content = seq![square.fade_in().with_rate_func(smooth)];     let mut circle: VItem = Circle::new(2.0)        .with(|circle| {            circle.set_color(manim::RED_C);        })        .into();    circle.with_origin(AabbPoint::CENTER, |x| {        x.rotate_on_z(PI / 4.0 + PI);    });     let mut vitem = VItem::from(square);    content        .push(vitem.morph_to(circle).with_rate_func(smooth))        .hold(1.0)        .push(vitem.clone().unwrite().with_rate_func(smooth))        .push(vitem.write().with_rate_func(smooth))        .push(vitem.fade_out().with_rate_func(smooth));     r.play(        CameraFrame::default()            .show()            .with_duration(content.cursor_sec()),    );    r.play(content);}