From 7fab87399f0c5121219c3b5a0c8f06a6dbdf084f Mon Sep 17 00:00:00 2001
From: brian cully <bjc@spork.org>
Date: Sun, 28 Dec 2025 11:44:15 -0500
Subject: more render simplification

---
 src/lib.rs | 46 +++++++++++++++++++++++++---------------------
 1 file changed, 25 insertions(+), 21 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 0c767e7..80d089a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,14 +12,31 @@ mod point;
 mod state;
 
 struct RenderLoop {
-    closure: Option<Closure<dyn FnMut(f64)>>,
+    inner: Rc<RefCell<Option<Closure<dyn FnMut(f64)>>>>,
 }
 
 impl RenderLoop {
-    pub fn new() -> Self {
-        Self {
-            closure: None,
-        }
+    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() }
     }
 }
 
@@ -58,19 +75,6 @@ fn request_animation_frame(f: &Closure<dyn FnMut(f64)>) {
         .expect("should register `requestAnimationFrame` OK");
 }
 
-fn rloop2<T: FnMut(f64) -> bool + 'static>(mut fun: T) -> Rc<RefCell<RenderLoop>> {
-    let res = Rc::new(RefCell::new(RenderLoop::new()));
-    let rloop = res.clone();
-
-    (*res).borrow_mut().closure = Some(Closure::new(move |t| {
-        if fun(t) {
-            request_animation_frame(rloop.borrow().closure.as_ref().expect("can borrow rloop"));
-        }
-    }));
-
-    res
-}
-
 #[wasm_bindgen(start)]
 pub fn init() -> Result<(), JsValue> {
     console_log::init_with_level(Level::Debug).expect("couldn't init console log");
@@ -82,11 +86,11 @@ pub fn init() -> Result<(), JsValue> {
     let mut s = State::new(canvas()?, fps()?)?;
     s.render_frame(0.0)?;
 
-    let render_loop = rloop2(move |t| {
+    let render_loop = RenderLoop::new(move |t| {
         s.render_frame(t).expect("should render frame");
         !*paused.lock().unwrap()
     });
-    request_animation_frame(render_loop.borrow().closure.as_ref().expect("can borrow res"));
+    render_loop.start()?;
 
     let a = Closure::<dyn FnMut()>::new(move || {
         let mut p = p1.lock().unwrap();
@@ -95,7 +99,7 @@ pub fn init() -> Result<(), JsValue> {
         let text = if *p {
             "go"
         } else {
-            request_animation_frame(render_loop.borrow().closure.as_ref().expect("render closure exists"));
+            render_loop.start().expect("start render loop");
             "pause"
         };
         go().expect("go button works").set_text_content(Some(text));
-- 
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