From 1fcec80e0eafdec4b5bab9bbaa19722bb7061026 Mon Sep 17 00:00:00 2001
From: Nolan Darilek <nolan@thewordnerd.info>
Date: Thu, 4 Aug 2022 11:49:17 -0500
Subject: [PATCH] Add system for limiting speed.

---
 src/navigation.rs | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/navigation.rs b/src/navigation.rs
index ea099a9..6620c8e 100644
--- a/src/navigation.rs
+++ b/src/navigation.rs
@@ -97,7 +97,7 @@ fn movement_controls<S>(
         if actions.pressed(NavigationAction::Move) {
             if let Some(pair) = actions.clamped_axis_pair(NavigationAction::Move) {
                 cleanup = true;
-                let mut direction = pair.xy();
+                let direction = pair.xy();
                 let strength = direction.length();
                 let forward_backward_movement_factor = if direction.x > 0. {
                     config.forward_movement_factor
@@ -271,6 +271,14 @@ fn add_speed(mut commands: Commands, query: Query<Entity, (Added<Speed>, Without
     }
 }
 
+fn limit_speed(mut query: Query<(&mut Speed, &MaxSpeed)>) {
+    for (mut speed, max_speed) in &mut query {
+        if **speed > **max_speed {
+            **speed = **max_speed;
+        }
+    }
+}
+
 fn remove_speed(removed: RemovedComponents<Speed>, mut query: Query<&mut Velocity>) {
     for entity in removed.iter() {
         if let Ok(mut velocity) = query.get_mut(entity) {
@@ -379,6 +387,7 @@ where
             .add_system(tick_snap_timers)
             .add_system(speak_direction.chain(error_handler))
             .add_system(add_speed)
+            .add_system(limit_speed)
             .add_system_to_stage(CoreStage::PostUpdate, remove_speed)
             .add_system_to_stage(CoreStage::PostUpdate, log_area_descriptions::<S, A>);
         const MOVEMENT_CONTROLS: &str = "MOVEMENT_CONTROLS";