# Animated props

> Anim<T> is a fixed value or a timeline! stored once in the video; ui.sample(&anim) reads it at the current time.

Page: https://fframes-kit.pages.dev/docs/basics/animated-props/

`Anim<T>` is a fixed value or a `timeline!` stored once in the video; `ui.sample(&anim)`
reads it at the current time.

```rust
use fframes::animation::KeyFramesAnimation;
use fframes_kit::prelude::*;

struct Pulse {
    radius: KeyFramesAnimation<f32>,
}

impl Pulse {
    fn new() -> Self {
        Self { radius: timeline!(at 0.0 => 1.0, animate 40.0_f32 => 80.0, Easing::EaseInOut) }
    }

    fn draw<'a>(&'a self, ui: &mut Ui<'a, '_, '_>) -> Svgr<'a> {
        let radius: Anim<'a, f32> = (&self.radius).into();
        let fixed: Anim<'a, f32> = 20.0.into();
        let (r, small) = (ui.sample(&radius), ui.sample(&fixed));
        svgr!(<g><circle cx="200" cy="200" r={r} /><circle cx="400" cy="200" r={small} /></g>)
    }
}
```