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 ++++--------------------------------------
 src/render_loop.rs | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+), 38 deletions(-)
 create mode 100644 src/render_loop.rs

(limited to 'src')

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");
diff --git a/src/render_loop.rs b/src/render_loop.rs
new file mode 100644
index 0000000..bc6d8a9
--- /dev/null
+++ b/src/render_loop.rs
@@ -0,0 +1,41 @@
+use std::cell::RefCell;
+use std::rc::Rc;
+
+use wasm_bindgen::prelude::*;
+
+pub struct RenderLoop {
+    inner: Rc<RefCell<Closure<dyn FnMut(f64)>>>,
+}
+
+impl RenderLoop {
+    fn request_animation_frame(f: &Closure<dyn FnMut(f64)>) {
+        web_sys::window().expect("no window")
+            .request_animation_frame(f.as_ref().unchecked_ref())
+            .expect("should register `requestAnimationFrame` OK");
+    }
+
+    pub fn new<T: FnMut(f64) -> bool + 'static>(mut fun: T) -> Self {
+        let inner = Rc::new(RefCell::new(Closure::new(|_| {})));
+        let rloop = inner.clone();
+
+        *inner.borrow_mut() = Closure::new(move |t| {
+            if fun(t) {
+                Self::request_animation_frame(&rloop.borrow());
+            }
+        });
+        Self { inner }
+    }
+
+    pub fn start(&self) -> Result<(), JsValue> {
+        Self::request_animation_frame(&self.inner.borrow());
+        Ok(())
+    }
+}
+
+impl Clone for RenderLoop {
+    fn clone(&self) -> Self {
+        Self {
+            inner: self.inner.clone(),
+        }
+    }
+}
-- 
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