From 260ddcad131c1907f8eea154ce8bfb4a30dc717b Mon Sep 17 00:00:00 2001
From: brian cully <bjc@spork.org>
Date: Sun, 28 Dec 2025 11:58:17 -0500
Subject: move render loop to its own module

---
 src/lib.rs | 42 ++++--------------------------------------
 1 file changed, 4 insertions(+), 38 deletions(-)

(limited to 'src/lib.rs')

diff --git a/src/lib.rs b/src/lib.rs
index e8e9c1a..87c68fb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,45 +1,17 @@
-use std::cell::RefCell;
-use std::sync::{Mutex};
 use std::rc::Rc;
+use std::sync::Mutex;
 
-use log::{Level, info, debug};
+use log::{Level, debug, info};
 use wasm_bindgen::prelude::*;
 
 use state::State;
+use render_loop::RenderLoop;
 
 mod line;
 mod point;
+mod render_loop;
 mod state;
 
-struct RenderLoop {
-    inner: Rc<RefCell<Option<Closure<dyn FnMut(f64)>>>>,
-}
-
-impl RenderLoop {
-    fn new<T: FnMut(f64) -> bool + 'static>(mut fun: T) -> Self {
-        let inner = Rc::new(RefCell::new(None));
-        let rloop = inner.clone();
-
-        *inner.borrow_mut() = Some(Closure::new(move |t| {
-            if fun(t) {
-                request_animation_frame(rloop.borrow().as_ref().expect("can borrow rloop"));
-            }
-        }));
-        Self { inner }
-    }
-
-    fn start(&self) -> Result<(), JsValue> {
-        request_animation_frame(self.inner.borrow().as_ref().ok_or("closure exists")?);
-        Ok(())
-    }
-}
-
-impl Clone for RenderLoop {
-    fn clone(&self) -> Self  {
-        Self { inner: self.inner.clone() }
-    }
-}
-
 fn window() -> web_sys::Window {
     web_sys::window().expect("no window")
 }
@@ -69,12 +41,6 @@ fn go() -> Result<web_sys::HtmlElement, JsValue> {
     Ok(x.dyn_into::<web_sys::HtmlElement>()?)
 }
 
-fn request_animation_frame(f: &Closure<dyn FnMut(f64)>) {
-    window()
-        .request_animation_frame(f.as_ref().unchecked_ref())
-        .expect("should register `requestAnimationFrame` OK");
-}
-
 #[wasm_bindgen(start)]
 pub fn init() -> Result<(), JsValue> {
     console_log::init_with_level(Level::Debug).expect("couldn't init console log");
-- 
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