From 6eb7c314062e94ea65031be2c5e1c2b613211fe5 Mon Sep 17 00:00:00 2001
From: Astro <astro@spaceboyz.net>
Date: Wed, 4 Mar 2020 18:34:02 +0100
Subject: [PATCH] Callbacks::draw() must not mutate the state

---
 examples/example00.rs | 2 +-
 src/lib.rs            | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/examples/example00.rs b/examples/example00.rs
index cf25ff2..0ef28ce 100644
--- a/examples/example00.rs
+++ b/examples/example00.rs
@@ -9,7 +9,7 @@ impl Callbacks for Example {
     }
     fn handle_event(&mut self, ev: Event) {}
     fn update(&mut self) {}
-    fn draw(&mut self, graphics: &mut Graphics) {}
+    fn draw(&self, graphics: &mut Graphics) {}
     fn clean_up(self) {}
 }
 
diff --git a/src/lib.rs b/src/lib.rs
index afc3b67..09cd232 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -21,7 +21,7 @@ pub trait Callbacks {
     }
     fn handle_event(&mut self, ev: Event);
     fn update(&mut self);
-    fn draw(&mut self, graphics: &mut Graphics);
+    fn draw(&self, graphics: &mut Graphics);
     fn clean_up(self);
 }