Implement killer name in chat

Former-commit-id: 5aa87529179a684d5675c33e4001806aa2040802

common/src/comp/mod.rs

@@ -22,4 +22,5 @@ pub use inputs::Jumping;
 pub use inputs::Respawning;
 pub use player::Player;
 pub use stats::Dying;
+pub use stats::HealthSource;
 pub use stats::Stats;

common/src/comp/stats.rs

@@ -1,17 +1,33 @@
-use crate::state::Time;
+use crate::state::{Time, Uid};
 use specs::{Component, FlaggedStorage, NullStorage, VecStorage};
 
+#[derive(Clone, Copy, Debug, Serialize, Deserialize)]
+pub enum HealthSource {
+    Attack { by: Uid }, // TODO: Implement weapon
+    Suicide,
+}
+
 #[derive(Clone, Copy, Debug, Serialize, Deserialize)]
 pub struct Health {
-    pub current: u32,
-    pub maximum: u32,
-    pub last_change: Option<(i32, f64)>,
+    current: u32,
+    maximum: u32,
+    pub last_change: Option<(i32, f64, HealthSource)>,
 }
 
 impl Health {
-    pub fn change_by(&mut self, amount: i32) {
+    pub fn get_current(&self) -> u32 {
+        self.current
+    }
+    pub fn get_maximum(&self) -> u32 {
+        self.maximum
+    }
+    pub fn set_to(&mut self, amount: u32, cause: HealthSource) {
+        self.last_change = Some((amount as i32 - self.current as i32, 0.0, cause));
+        self.current = amount;
+    }
+    pub fn change_by(&mut self, amount: i32, cause: HealthSource) {
         self.current = (self.current as i32 + amount).max(0) as u32;
-        self.last_change = Some((amount, 0.0));
+        self.last_change = Some((amount, 0.0, cause));
     }
 }
 
@@ -47,9 +63,11 @@ impl Component for Stats {
     type Storage = FlaggedStorage<Self, VecStorage<Self>>;
 }
 
-#[derive(Copy, Clone, Debug, Default, Serialize, Deserialize)]
-pub struct Dying;
+#[derive(Copy, Clone, Debug, Serialize, Deserialize)]
+pub struct Dying {
+    pub cause: HealthSource,
+}
 
 impl Component for Dying {
-    type Storage = NullStorage<Self>;
+    type Storage = VecStorage<Self>;
 }

common/src/sys/inputs.rs

@@ -6,9 +6,10 @@ use vek::*;
 use crate::{
     comp::{
         phys::{Dir, ForceUpdate, Pos, Vel},
-        Animation, AnimationInfo, Attacking, Control, Gliding, Jumping, Respawning, Stats,
+        Animation, AnimationInfo, Attacking, Control, Gliding, HealthSource, Jumping, Respawning,
+        Stats,
     },
-    state::{DeltaTime, Time},
+    state::{DeltaTime, Time, Uid},
     terrain::TerrainMap,
     vol::{ReadVol, Vox},
 };
@@ -19,6 +20,7 @@ pub struct Sys;
 impl<'a> System<'a> for Sys {
     type SystemData = (
         Entities<'a>,
+        ReadStorage<'a, Uid>,
         Read<'a, Time>,
         Read<'a, DeltaTime>,
         ReadExpect<'a, TerrainMap>,
@@ -39,6 +41,7 @@ impl<'a> System<'a> for Sys {
         &mut self,
         (
             entities,
+            uids,
             time,
             dt,
             terrain,
@@ -140,8 +143,8 @@ impl<'a> System<'a> for Sys {
             );
         }
 
-        for (entity, pos, dir, attacking) in
-            (&entities, &positions, &directions, &mut attackings).join()
+        for (entity, &uid, pos, dir, attacking) in
+            (&entities, &uids, &positions, &directions, &mut attackings).join()
         {
             if !attacking.applied {
                 for (b, pos_b, mut stat_b, mut vel_b) in
@@ -154,7 +157,7 @@ impl<'a> System<'a> for Sys {
                         && dir.0.angle_between(pos_b.0 - pos.0).to_degrees() < 70.0
                     {
                         // Deal damage
-                        stat_b.hp.change_by(-10); // TODO: variable damage
+                        stat_b.hp.change_by(-10, HealthSource::Attack { by: uid }); // TODO: variable damage and weapon
                         vel_b.0 += (pos_b.0 - pos.0).normalized() * 10.0;
                         vel_b.0.z = 15.0;
                         force_updates.insert(b, ForceUpdate);

common/src/sys/stats.rs

@@ -23,7 +23,16 @@ impl<'a> System<'a> for Sys {
         for (entity, mut stat) in (&entities, &mut stats).join() {
             if stat.should_die() && !stat.is_dead {
                 // TODO: Replace is_dead with client states
-                dyings.insert(entity, Dying);
+                dyings.insert(
+                    entity,
+                    Dying {
+                        cause: stat
+                            .hp
+                            .last_change
+                            .expect("Nothing caused the entity to die")
+                            .2, // Safe because damage is necessary for death
+                    },
+                );
                 stat.is_dead = true;
             }
             if let Some(change) = &mut stat.hp.last_change {

server/src/cmd.rs

@@ -150,7 +150,7 @@ fn handle_kill(server: &mut Server, entity: EcsEntity, args: String, action: &Ch
         .ecs_mut()
         .write_storage::<comp::Stats>()
         .get_mut(entity)
-        .map(|s| s.hp.current = 0);
+        .map(|s| s.hp.set_to(0, comp::HealthSource::Suicide));
 }
 
 fn handle_alias(server: &mut Server, entity: EcsEntity, args: String, action: &ChatCommand) {

server/src/lib.rs

@@ -211,14 +211,35 @@ impl Server {
         self.world.tick(dt);
 
         // Sync deaths.
-        let todo_kill = (
-            &self.state.ecs().entities(),
-            &self.state.ecs().read_storage::<comp::Dying>(),
-        )
+        let ecs = &self.state.ecs();
+        let clients = &mut self.clients;
+        let todo_kill = (&ecs.entities(), &ecs.read_storage::<comp::Dying>())
             .join()
-            .map(|(entity, _)| entity)
+            .map(|(entity, dying)| {
+                // Chat message
+                if let Some(player) = ecs.read_storage::<comp::Player>().get(entity) {
+                    // While waiting for if-let-chains to be implemented...
+                    let msg = if let comp::HealthSource::Attack { by } = dying.cause {
+                        if let Some(attacker) = ecs
+                            .read_storage::<comp::Player>()
+                            .get(ecs.entity_from_uid(by.into()).unwrap())
+                        {
+                            format!("{} was killed by {}", &player.alias, &attacker.alias)
+                        } else {
+                            format!("{} died", &player.alias)
+                        }
+                    } else {
+                        format!("{} died", &player.alias)
+                    };
+
+                    clients.notify_registered(ServerMsg::Chat(msg));
+                }
+
+                entity
+            })
             .collect::<Vec<_>>();
 
+        // Actually kill them
         for entity in todo_kill {
             if let Some(client) = self.clients.get_mut(&entity) {
                 self.state
@@ -229,11 +250,6 @@ impl Server {
                 self.state.ecs_mut().delete_entity_synced(entity);
                 continue;
             }
-
-            if let Some(player) = self.state.ecs().read_storage::<comp::Player>().get(entity) {
-                self.clients
-                    .notify_registered(ServerMsg::Chat(format!("{} died", &player.alias)));
-            }
         }
 
         // Handle respawns

voxygen/src/hud/mod.rs

@@ -358,7 +358,7 @@ impl Hud {
                 // Filling
                 Rectangle::fill_with(
                     [
-                        120.0 * (stats.hp.current as f64 / stats.hp.maximum as f64),
+                        120.0 * (stats.hp.get_current() as f64 / stats.hp.get_maximum() as f64),
                         8.0,
                     ],
                     HP_COLOR,

voxygen/src/hud/skillbar.rs

@@ -78,7 +78,7 @@ impl<'a> Widget for Skillbar<'a> {
         let next_level_xp = (level as f64).powi(4) - start_level_xp;
         // TODO: We need a max xp value
         let xp_percentage = (self.stats.xp as f64 - start_level_xp) / next_level_xp;
-        let hp_percentage = self.stats.hp.current as f64 / self.stats.hp.maximum as f64;
+        let hp_percentage = self.stats.hp.get_current() as f64 / self.stats.hp.get_maximum() as f64;
         let mana_percentage = 1.0;
 
         // TODO: Only show while aiming with a bow or when casting a spell.

voxygen/src/scene/figure.rs

@@ -475,7 +475,7 @@ impl FigureMgr {
             // Change in health as color!
             let col = stats
                 .and_then(|stats| stats.hp.last_change)
-                .map(|(change_by, time)| {
+                .map(|(change_by, time, _)| {
                     Rgba::broadcast(1.0)
                         + Rgba::new(0.0, -1.0, -1.0, 0.0)
                             .map(|c| (c / (1.0 + DAMAGE_FADE_COEFFICIENT * time)) as f32)