crates/border-wars/src/camera.rs

@@ -1,13 +1,24 @@
 //! TODO
 
+use bevy::input::mouse::MouseScrollUnit;
 use bevy::prelude::*;
+use bevy::input::mouse::MouseWheel;
+
+/// TODO
+const CAMERRA_SPEED: f32 = 10.;
+const CAMERRA_SPEED_ZOOM: f32 = 0.1;
+const SMOOTHING: f32 = 0.5;
+const MIN_ZOOM: f32 = 0.5;
+const MAX_ZOOM: f32 = 5.;
 
 /// TODO
 pub struct CameraPlugin;
 
 impl Plugin for CameraPlugin {
     fn build(&self, app: &mut App) {
-        app.add_systems(Startup, init_camera);
+        app.add_systems(Startup, init_camera)
+        .add_systems(Update, handle_movement)
+        .add_systems(Update, zoom_system);
     }
 }
 
@@ -16,6 +27,41 @@ fn init_camera(mut commands: Commands) {
     commands.spawn(Camera2dBundle::default());
 }
 
-fn movement_system(){}
+fn handle_movement(mut query: Query<&mut Transform, With<Camera>>, keys: Res<Input<KeyCode>>,){
-fn zoom_system(){}
+    for mut camera_transform in query.iter_mut() {
+        let mut target = camera_transform.translation.clone();
+        if keys.pressed(KeyCode::Z) {
+            target.y += CAMERRA_SPEED;
+        }
+        else if keys.pressed(KeyCode::S) {
+            target.y -= CAMERRA_SPEED;
+        }
+
+        if keys.pressed(KeyCode::D) {
+            target.x += CAMERRA_SPEED;
+        }
+        else if keys.pressed(KeyCode::Q) {
+            target.x -= CAMERRA_SPEED;
+        }
+        camera_transform.translation = camera_transform
+            .translation
+            .lerp(target, SMOOTHING);
+    }    
+}
+
+fn zoom_system(mut scroll_evr: EventReader<MouseWheel>, mut query: Query<&mut OrthographicProjection, With<Camera>>){
+    for ev in scroll_evr.read() {
+        for mut camera_projection in query.iter_mut() {
+            
+            if ev.unit == MouseScrollUnit::Pixel {
+                return;
+            }
+
+            if camera_projection.scale + ev.y * CAMERRA_SPEED_ZOOM > MIN_ZOOM && camera_projection.scale + ev.y * CAMERRA_SPEED_ZOOM < MAX_ZOOM {
+
+                camera_projection.scale +=  ev.y * CAMERRA_SPEED_ZOOM;
+            }
+        }
+    }
+}