Adds FPS counter

src/main.rs

@@ -1,5 +1,10 @@
 
-use bevy::{prelude::*, sprite::MaterialMesh2dBundle};
+use bevy::{
+    prelude::*, 
+    diagnostic::{FrameTimeDiagnosticsPlugin, DiagnosticsStore}, 
+    window::{PresentMode, WindowTheme},
+    sprite::MaterialMesh2dBundle};
+
 use std::time::Instant;
 
 mod neural_net;
@@ -7,6 +12,9 @@ mod neural_net;
 #[derive(Component)]
 struct Agent;
 
+#[derive(Component)]
+struct FpsText;
+
 #[derive(Resource)]
 struct SimulationState
 {
@@ -29,11 +37,27 @@ impl SimulationState
 fn main() 
 {
     App::new()
-        .add_plugins(DefaultPlugins)
+        .add_plugins((
+            DefaultPlugins.set(WindowPlugin {
+                primary_window: Some(Window {
+                    title: "Life Sim".into(),
+                    resolution: (1280., 720.).into(),
+                    present_mode: PresentMode::AutoVsync,
+                    // Tells wasm to resize the window according to the available canvas
+                    fit_canvas_to_parent: true,
+                    // Tells wasm not to override default event handling, like F5, Ctrl+R etc.
+                    prevent_default_event_handling: false,
+                    window_theme: Some(WindowTheme::Dark),
+                    ..default()
+                }),
+                ..default()
+            }),
+            FrameTimeDiagnosticsPlugin
+        ))
         .insert_resource(SimulationState::new(200))
         .insert_resource(Time::new(Instant::now()))
         .add_systems(Startup, setup)
-        .add_systems(Update, tick_simulation)
+        .add_systems(Update, (tick_simulation, ui_update))
         .run();
 }
 
@@ -53,6 +77,29 @@ fn setup(mut commands: Commands, mut meshes: ResMut<Assets<Mesh>>, mut materials
             },
         Agent
     ));
+
+
+    // UI
+    // Text with multiple sections
+    commands.spawn((
+        // Create a TextBundle that has a Text with a list of sections.
+        TextBundle::from_sections([
+            TextSection::new(
+                "FPS: ",
+                TextStyle {
+                    font_size: 60.0,
+                    color: Color::WHITE,
+                    ..default()
+                },
+            ),
+            TextSection::from_style(TextStyle {
+                font_size: 60.0,
+                color: Color::GOLD,
+                ..default()
+            }),
+        ]),
+        FpsText,
+    ));
 }
 
 fn tick_simulation(mut state: ResMut<SimulationState>, delta_time: Res<Time>, mut query: Query<&mut Transform, With<Agent>>)
@@ -66,7 +113,7 @@ fn tick_simulation(mut state: ResMut<SimulationState>, delta_time: Res<Time>, mu
     // Process agent actions
     let mut agent_transform = query.single_mut();
 
-    agent_transform.translation.x += 0.5;
+    agent_transform.translation.x += 50.0 * delta_time.delta_seconds();
 
     let elapsed_time = now.elapsed();
     state.last_gen_time += state.last_step_time;
@@ -81,3 +128,18 @@ fn tick_simulation(mut state: ResMut<SimulationState>, delta_time: Res<Time>, mu
         
     }
 }
+
+fn ui_update(mut state: Res<SimulationState>, diagnostics: Res<DiagnosticsStore>, mut query: Query<&mut Text, With<FpsText>>)
+{
+    for mut text in &mut query 
+    {
+        if let Some(fps) = diagnostics.get(FrameTimeDiagnosticsPlugin::FPS) 
+        {
+            if let Some(value) = fps.smoothed() 
+            {
+                // Update the value of the second section
+                text.sections[1].value = format!("{value:.2}");
+            }
+        }
+    }
+}