commit 5d32243dce54b1cbb4b551ff2a0e24ba52c67ecc
Author: Julian <julian.niessner@rismer.de>
Date:   Mon Jan 3 13:30:34 2022 +0100

    mouse lock

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
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diff --git a/Cargo.lock b/Cargo.lock
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+ "percent-encoding",
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+ "wasm-bindgen",
+ "web-sys",
+ "winapi 0.3.9",
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+ "pkg-config",
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..2667b0d
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "l_system_plants"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bevy = "0.5"
diff --git a/src/bundles/camera.rs b/src/bundles/camera.rs
new file mode 100644
index 0000000..449d557
--- /dev/null
+++ b/src/bundles/camera.rs
@@ -0,0 +1,48 @@
+use bevy::ecs::bundle::Bundle;
+use bevy::transform::components::{GlobalTransform, Transform};
+use bevy::render::{
+    camera::{
+        Camera, PerspectiveProjection,
+        VisibleEntities,
+    },
+    render_graph::base,
+};
+use bevy::math::*;
+
+#[derive(Debug, Default)]
+pub struct FPSCamera
+{
+    pub yaw: f32,
+    pub pitch: f32
+}
+
+/// Component bundle for fps camera entities with perspective projection
+#[derive(Bundle)]
+pub struct FpsCameraBundle {
+    pub camera: Camera,
+    pub perspective_projection: PerspectiveProjection,
+    pub visible_entities: VisibleEntities,
+    pub transform: Transform,
+    pub global_transform: GlobalTransform,
+    pub fps_camera: FPSCamera,
+}
+
+impl Default for FpsCameraBundle {
+    fn default() -> Self {
+        FpsCameraBundle {
+            camera: Camera {
+                name: Some(base::camera::CAMERA_3D.to_string()),
+                ..Default::default()
+            },
+            perspective_projection: PerspectiveProjection {
+                near: 0.1,
+                far: 1000.0,
+                ..Default::default()
+            },
+            visible_entities: Default::default(),
+            transform: Default::default(),
+            global_transform: Default::default(),
+            fps_camera: Default::default(),
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/bundles/mod.rs b/src/bundles/mod.rs
new file mode 100644
index 0000000..2cee3eb
--- /dev/null
+++ b/src/bundles/mod.rs
@@ -0,0 +1 @@
+pub mod camera;
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..3057b7c
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,127 @@
+use bevy::input::mouse::MouseMotion;
+use bevy::prelude::*;
+
+mod bundles;
+use bundles::camera::*;
+
+
+fn main() {
+    App::build()
+    .insert_resource(Msaa {samples: 4})
+    .add_plugins(DefaultPlugins)
+    .add_startup_system(startup.system())
+    .add_startup_system(initial_grab_cursor.system())
+    .add_system(camera_movement_system.system())
+    .add_system(camera_update_system.system())
+    .add_system(cursor_grab.system())
+    .run();
+}
+
+fn camera_movement_system(
+    time: Res<Time>,
+    keyboard_input: Res<Input<KeyCode>>,
+    windows: Res<Windows>,
+    mut mouse_input: EventReader<MouseMotion>,
+    mut query: Query<(&mut Transform, &mut FPSCamera)>)
+{  
+    let window = windows.get_primary().unwrap();
+    if !window.cursor_locked()
+    {
+        return;
+    }
+    for (mut transform, mut cam) in query.iter_mut() {
+        let mouse_sensitivity = 25.;
+        let walking_speed = 0.5;
+
+        for ev_m in mouse_input.iter()
+        {
+            cam.yaw += ev_m.delta.x * time.delta_seconds() * mouse_sensitivity;
+            cam.pitch += ev_m.delta.y * time.delta_seconds() * mouse_sensitivity * -1.;
+            if cam.pitch > 89.0
+            {
+                cam.pitch = 89.0;
+            }
+            if cam.pitch < -89.0
+            {
+                cam.pitch = -89.0;
+            }
+        }
+        let local_z = transform.local_z();
+        let forward = -Vec3::new(local_z.x, 0., local_z.z);
+        let right = Vec3::new(local_z.z, 0., -local_z.x);
+
+        for key in keyboard_input.get_pressed()
+        {
+            match key {
+                KeyCode::W => transform.translation += forward * time.delta_seconds() * walking_speed,
+                KeyCode::A => transform.translation += -right  * time.delta_seconds() * walking_speed,
+                KeyCode::S => transform.translation += -forward * time.delta_seconds() * walking_speed,
+                KeyCode::D => transform.translation += right * time.delta_seconds() * walking_speed,
+                KeyCode::Space => transform.translation += Vec3::Y * time.delta_seconds() * walking_speed,
+                KeyCode::C => transform.translation -= Vec3::Y * time.delta_seconds() * walking_speed,
+                _ => (),
+            }
+        }
+    }
+}
+
+
+fn camera_update_system(
+    mut query: Query<(&mut Transform, &FPSCamera)>
+)
+{
+    if let Ok((mut trans, cam)) = query.single_mut() {
+        let mut direction = Vec3::ZERO;
+
+        direction.x = cam.yaw.to_radians().cos() * cam.pitch.to_radians().cos();
+        direction.y = cam.pitch.to_radians().sin();
+        direction.z = cam.yaw.to_radians().sin() * cam.pitch.to_radians().cos();
+        direction.normalize();
+
+        let pos = trans.translation;
+        let transform = Transform::from_translation(pos).looking_at(pos + direction, Vec3::Y);
+        trans.clone_from(&transform);
+    }
+}
+
+fn cursor_grab(keys: Res<Input<KeyCode>>, mut windows: ResMut<Windows>)
+{
+    let window = windows.get_primary_mut().unwrap();
+    if keys.just_pressed(KeyCode::Escape) {
+        toggle_grab_cursor(window);
+    }
+}
+
+fn toggle_grab_cursor(window: &mut Window)
+{
+    window.set_cursor_lock_mode(!window.cursor_locked());
+    window.set_cursor_visibility(!window.cursor_visible());
+}
+
+fn initial_grab_cursor(mut windows: ResMut<Windows>)
+{
+    toggle_grab_cursor(windows.get_primary_mut().unwrap());
+}
+
+fn startup(mut commands: Commands,
+            mut meshes: ResMut<Assets<Mesh>>,
+            mut materials: ResMut<Assets<StandardMaterial>>)
+{
+    //Plane
+    commands.spawn_bundle(PbrBundle {
+        mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0})),
+        material: materials.add(Color::rgb(0.3,0.5,0.3).into()),
+        ..Default::default()
+    });
+
+    // light
+    commands.spawn_bundle(LightBundle {
+        transform: Transform::from_xyz(4.0,8.0,4.0),
+        ..Default::default()
+    });
+
+    commands.spawn_bundle(FpsCameraBundle {
+        transform: Transform::from_xyz(-2.0,2.5,5.0).looking_at(Vec3::ZERO, Vec3::Y),
+        ..Default::default()
+    });
+}