clean up examples

examples/2d/text2d.rs

@@ -91,8 +91,8 @@ fn animate_translation(
     mut query: Query<&mut Transform, (With<Text>, With<AnimateTranslation>)>,
 ) {
     for mut transform in &mut query {
-        transform.translation.x = 100.0 * time.seconds_since_startup().sin() as f32 - 400.0;
-        transform.translation.y = 100.0 * time.seconds_since_startup().cos() as f32;
+        transform.translation.x = 100.0 * time.seconds_since_startup().sin() - 400.0;
+        transform.translation.y = 100.0 * time.seconds_since_startup().cos();
     }
 }
 
@@ -101,7 +101,7 @@ fn animate_rotation(
     mut query: Query<&mut Transform, (With<Text>, With<AnimateRotation>)>,
 ) {
     for mut transform in &mut query {
-        transform.rotation = Quat::from_rotation_z(time.seconds_since_startup().cos() as f32);
+        transform.rotation = Quat::from_rotation_z(time.seconds_since_startup().cos());
     }
 }
 
@@ -113,6 +113,6 @@ fn animate_scale(
     // rendered quad, resulting in a pixellated look.
     for mut transform in &mut query {
         transform.translation = Vec3::new(400.0, 0.0, 0.0);
-        transform.scale = Vec3::splat((time.seconds_since_startup().sin() as f32 + 1.1) * 2.0);
+        transform.scale = Vec3::splat((time.seconds_since_startup().sin() + 1.1) * 2.0);
     }
 }

examples/3d/load_gltf.rs

@@ -50,7 +50,7 @@ fn animate_light_direction(
         transform.rotation = Quat::from_euler(
             EulerRot::ZYX,
             0.0,
-            time.seconds_since_startup() as f32 * std::f32::consts::TAU / 10.0,
+            time.seconds_since_startup() * std::f32::consts::TAU / 10.0,
             -std::f32::consts::FRAC_PI_4,
         );
     }

examples/3d/spotlight.rs

@@ -123,12 +123,11 @@ fn light_sway(time: Res<Time>, mut query: Query<(&mut Transform, &mut SpotLight)
     for (mut transform, mut angles) in query.iter_mut() {
         transform.rotation = Quat::from_euler(
             EulerRot::XYZ,
-            -std::f32::consts::FRAC_PI_2
-                + (time.seconds_since_startup() * 0.67 * 3.0).sin() as f32 * 0.5,
-            (time.seconds_since_startup() * 3.0).sin() as f32 * 0.5,
+            -std::f32::consts::FRAC_PI_2 + (time.seconds_since_startup() * 0.67 * 3.0).sin() * 0.5,
+            (time.seconds_since_startup() * 3.0).sin() * 0.5,
             0.0,
         );
-        let angle = ((time.seconds_since_startup() * 1.2).sin() as f32 + 1.0)
+        let angle = ((time.seconds_since_startup() * 1.2).sin() + 1.0)
             * (std::f32::consts::FRAC_PI_4 - 0.1);
         angles.inner_angle = angle * 0.8;
         angles.outer_angle = angle;

examples/3d/transparency_3d.rs

@@ -88,7 +88,7 @@ fn setup(
 ///                when the alpha value goes back below the threshold.
 /// - `Blend`: Object fades in and out smoothly.
 pub fn fade_transparency(time: Res<Time>, mut materials: ResMut<Assets<StandardMaterial>>) {
-    let alpha = (time.time_since_startup().as_secs_f32().sin() / 2.0) + 0.5;
+    let alpha = (time.seconds_since_startup().sin() / 2.0) + 0.5;
     for (_, material) in materials.iter_mut() {
         material.base_color.set_a(alpha);
     }

examples/3d/update_gltf_scene.rs

@@ -53,9 +53,9 @@ fn move_scene_entities(
         iter_hierarchy(moved_scene_entity, &children, &mut |entity| {
             if let Ok(mut transform) = transforms.get_mut(entity) {
                 transform.translation = Vec3::new(
-                    offset * time.seconds_since_startup().sin() as f32 / 20.,
+                    offset * time.seconds_since_startup().sin() / 20.,
                     0.,
-                    time.seconds_since_startup().cos() as f32 / 20.,
+                    time.seconds_since_startup().cos() / 20.,
                 );
                 offset += 1.0;
             }

examples/animation/custom_skinned_mesh.rs

@@ -164,9 +164,7 @@ fn setup(
 /// Animate the joint marked with [`AnimatedJoint`] component.
 fn joint_animation(time: Res<Time>, mut query: Query<&mut Transform, With<AnimatedJoint>>) {
     for mut transform in &mut query {
-        transform.rotation = Quat::from_axis_angle(
-            Vec3::Z,
-            0.5 * PI * time.time_since_startup().as_secs_f32().sin(),
-        );
+        transform.rotation =
+            Quat::from_axis_angle(Vec3::Z, 0.5 * PI * time.seconds_since_startup().sin());
     }
 }

examples/animation/gltf_skinned_mesh.rs

@@ -66,9 +66,7 @@ fn joint_animation(
         // Get `Transform` in the second joint.
         let mut second_joint_transform = transform_query.get_mut(second_joint_entity).unwrap();
 
-        second_joint_transform.rotation = Quat::from_axis_angle(
-            Vec3::Z,
-            0.5 * PI * time.time_since_startup().as_secs_f32().sin(),
-        );
+        second_joint_transform.rotation =
+            Quat::from_axis_angle(Vec3::Z, 0.5 * PI * time.seconds_since_startup().sin());
     }
 }

examples/audio/audio_control.rs

@@ -32,7 +32,7 @@ fn update_speed(
     time: Res<Time>,
 ) {
     if let Some(sink) = audio_sinks.get(&music_controller.0) {
-        sink.set_speed(((time.seconds_since_startup() / 5.0).sin() as f32 + 1.0).max(0.1));
+        sink.set_speed(((time.seconds_since_startup() / 5.0).sin() + 1.0).max(0.1));
     }
 }
 

examples/ecs/component_change_detection.rs

@@ -14,7 +14,7 @@ fn main() {
 }
 
 #[derive(Component, Debug)]
-struct MyComponent(f64);
+struct MyComponent(f32);
 
 fn setup(mut commands: Commands) {
     commands.spawn().insert(MyComponent(0.));

examples/ecs/fixed_timestep.rs

@@ -31,22 +31,30 @@ fn main() {
         .run();
 }
 
-fn frame_update(mut last_time: Local<f64>, time: Res<Time>) {
-    info!("update: {}", time.seconds_since_startup() - *last_time);
-    *last_time = time.seconds_since_startup();
+fn frame_update(mut last_time: Local<f32>, time: Res<Time>) {
+    info!(
+        "time since last frame_update: {}",
+        time.raw_seconds_since_startup() - *last_time
+    );
+    *last_time = time.raw_seconds_since_startup();
 }
 
-fn fixed_update(mut last_time: Local<f64>, time: Res<Time>, fixed_timesteps: Res<FixedTimesteps>) {
+fn fixed_update(mut last_time: Local<f32>, time: Res<Time>, fixed_timesteps: Res<FixedTimesteps>) {
     info!(
-        "fixed_update: {}",
-        time.seconds_since_startup() - *last_time,
+        "time since last fixed_update: {}\n",
+        time.raw_seconds_since_startup() - *last_time
     );
 
-    let fixed_timestep = fixed_timesteps.get(LABEL).unwrap();
+    let state = fixed_timesteps.get(LABEL).unwrap();
+
+    info!("fixed timestep: {}\n", 0.5);
     info!(
-        "  overstep_percentage: {}",
-        fixed_timestep.overstep_percentage()
+        "time accrued toward next fixed_update: {}\n",
+        state.accumulator()
     );
-
-    *last_time = time.seconds_since_startup();
+    info!(
+        "time accrued toward next fixed_update (% of timestep): {}",
+        state.overstep_percentage()
+    );
+    *last_time = time.raw_seconds_since_startup();
 }

examples/games/alien_cake_addict.rs

@@ -348,7 +348,7 @@ fn rotate_bonus(game: Res<Game>, time: Res<Time>, mut transforms: Query<&mut Tra
         if let Ok(mut cake_transform) = transforms.get_mut(entity) {
             cake_transform.rotate_y(time.delta_seconds());
             cake_transform.scale = Vec3::splat(
-                1.0 + (game.score as f32 / 10.0 * time.seconds_since_startup().sin() as f32).abs(),
+                1.0 + (game.score as f32 / 10.0 * time.seconds_since_startup().sin()).abs(),
             );
         }
     }

examples/scene/scene.rs

@@ -43,7 +43,7 @@ impl FromWorld for ComponentB {
     fn from_world(world: &mut World) -> Self {
         let time = world.resource::<Time>();
         ComponentB {
-            _time_since_startup: time.time_since_startup(),
+            _time_since_startup: time.elapsed_since_startup(),
             value: "Default Value".to_string(),
         }
     }

examples/shader/animate_shader.rs

@@ -144,7 +144,7 @@ impl ExtractResource for ExtractedTime {
 
     fn extract_resource(time: &Self::Source) -> Self {
         ExtractedTime {
-            seconds_since_startup: time.seconds_since_startup() as f32,
+            seconds_since_startup: time.seconds_since_startup(),
         }
     }
 }

examples/tools/scene_viewer.rs

@@ -330,7 +330,7 @@ fn update_lights(
             transform.rotation = Quat::from_euler(
                 EulerRot::ZYX,
                 0.0,
-                time.seconds_since_startup() as f32 * TAU / 30.0,
+                time.seconds_since_startup() * TAU / 30.0,
                 -TAU / 8.,
             );
         }

examples/ui/text.rs

@@ -85,7 +85,7 @@ fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
 
 fn text_color_system(time: Res<Time>, mut query: Query<&mut Text, With<ColorText>>) {
     for mut text in &mut query {
-        let seconds = time.seconds_since_startup() as f32;
+        let seconds = time.seconds_since_startup();
 
         // Update the color of the first and only section.
         text.sections[0].style.color = Color::Rgba {