Add the ownership system (#96)

closes: #67
Reviewed-on: #96
Reviewed-by: Raphaël <r.lauray@outlook.fr>
Co-authored-by: CoCo_Sol <solois.corentin@gmail.com>
Co-committed-by: CoCo_Sol <solois.corentin@gmail.com>

crates/border-wars/src/lib.rs

@@ -36,4 +36,7 @@ pub struct Player {
 
     /// The uuid of the player.
     pub uuid: Uuid,
+
+    /// The color of the player.
+    pub color: (u8, u8, u8),
 }

crates/border-wars/src/main.rs

@@ -3,6 +3,7 @@
 use bevy::prelude::*;
 use border_wars::camera::CameraPlugin;
 use border_wars::map::generation::MapGenerationPlugin;
+use border_wars::map::ownership::OwnershipPlugin;
 use border_wars::map::renderer::RendererPlugin;
 use border_wars::map::selected_tile::SelectTilePlugin;
 use border_wars::networking::NetworkingPlugin;
@@ -19,5 +20,6 @@ fn main() {
         .add_plugins(NetworkingPlugin)
         .add_plugins(MapGenerationPlugin)
         .add_plugins(UiPlugin)
+        .add_plugins(OwnershipPlugin)
         .run();
 }

crates/border-wars/src/map/mod.rs

@@ -2,6 +2,7 @@
 
 pub mod generation;
 pub mod hex;
+pub mod ownership;
 pub mod renderer;
 pub mod selected_tile;
 

crates/border-wars/src/map/ownership.rs

@@ -0,0 +1,53 @@
+//! All code related to the ownership of the tiles.
+
+use bevy::prelude::*;
+
+use crate::Player;
+
+/// The owner of a tile.
+#[derive(Component, Clone)]
+pub struct Owner(pub Player);
+
+/// The plugin to render the ownership of the tiles.
+pub struct OwnershipPlugin;
+
+impl Plugin for OwnershipPlugin {
+    fn build(&self, app: &mut App) {
+        app.add_systems(Update, render_ownership);
+        app.add_systems(Startup, setup_ownership_resources);
+    }
+}
+
+/// The contrast of the ownership colors.
+///
+/// The value is a number between 0 and 1.
+#[derive(Resource)]
+pub struct OwnershipColorContrast(pub f32);
+
+/// Init resources related to the ownership of the tiles.
+fn setup_ownership_resources(mut commands: Commands) {
+    commands.insert_resource(OwnershipColorContrast(0.4));
+}
+
+/// Render the ownership of the tiles by applying colors.
+fn render_ownership(
+    mut query: Query<(&mut Sprite, &Owner), Changed<Owner>>,
+    contrast: Res<OwnershipColorContrast>,
+) {
+    for (mut sprite, owner) in query.iter_mut() {
+        let (r, g, b) = owner.0.color;
+        let target = mix_colors(Color::rgb_u8(r, g, b), sprite.color, 1. - contrast.0);
+
+        sprite.color = target;
+    }
+}
+
+/// Mixes two colors.
+fn mix_colors(color1: Color, color2: Color, alpha: f32) -> Color {
+    let [r1, g1, b1, _] = color1.as_rgba_u8();
+    let [r2, g2, b2, _] = color2.as_rgba_u8();
+    let mixed_r = (1.0 - alpha).mul_add(r1 as f32, alpha * r2 as f32).round() as u8;
+    let mixed_g = (1.0 - alpha).mul_add(g1 as f32, alpha * g2 as f32).round() as u8;
+    let mixed_b = (1.0 - alpha).mul_add(b1 as f32, alpha * b2 as f32).round() as u8;
+    Color::rgb_u8(mixed_r, mixed_g, mixed_b)
+}

crates/border-wars/src/scenes/menu.rs

@@ -58,6 +58,7 @@ fn menu_ui(
                         name: name.clone(),
                         rank: PlayerRank::Player,
                         uuid,
+                        color: rand::random::<(u8, u8, u8)>(),
                     }),
                 ));
             }
@@ -71,6 +72,7 @@ fn menu_ui(
                 name: name.clone(),
                 rank: PlayerRank::Admin,
                 uuid,
+                color: rand::random::<(u8, u8, u8)>(),
             });
         }
     });