Add experience and leveling up, completing section 5.11

src/components.rs

@@ -83,16 +83,21 @@ pub struct WantsToMelee {
 
 #[derive(Component, Debug, ConvertSaveload, Clone)]
 pub struct SufferDamage {
-    pub amount: Vec<i32>,
+    pub amount: Vec<(i32, bool)>,
 }
 
 impl SufferDamage {
-    pub fn new_damage(store: &mut WriteStorage<SufferDamage>, victim: Entity, amount: i32) {
+    pub fn new_damage(
+        store: &mut WriteStorage<SufferDamage>,
+        victim: Entity,
+        amount: i32,
+        from_player: bool,
+    ) {
         if let Some(suffering) = store.get_mut(victim) {
-            suffering.amount.push(amount);
+            suffering.amount.push((amount, from_player));
         } else {
             let dmg = SufferDamage {
-                amount: vec![amount],
+                amount: vec![(amount, from_player)],
             };
             store.insert(victim, dmg).expect("Unable to insert damage");
         }

src/damage_system.rs

@@ -1,33 +1,96 @@
-use ::rltk::RandomNumberGenerator;
+use ::rltk::{Point, RandomNumberGenerator};
 use ::specs::prelude::*;
+use rltk::RGB;
 
 use crate::components::{
-    Equipped, InBackpack, LootTable, Name, Player, Pools, Position, SufferDamage,
+    Attributes, Equipped, InBackpack, LootTable, Name, Player, Pools, Position, SufferDamage,
 };
 use crate::game_log::GameLog;
+use crate::gamesystem::{mana_at_level, player_hp_at_level};
+use crate::particle_system::ParticleBuilder;
 use crate::raws::{get_item_drop, spawn_named_item, SpawnType, RAWS};
 use crate::{Map, RunState};
 
 pub struct DamageSystem {}
 
 impl<'a> System<'a> for DamageSystem {
+    #[allow(clippy::type_complexity)]
     type SystemData = (
         WriteStorage<'a, Pools>,
         WriteStorage<'a, SufferDamage>,
         ReadStorage<'a, Position>,
         WriteExpect<'a, Map>,
         Entities<'a>,
+        ReadExpect<'a, Entity>,
+        ReadStorage<'a, Attributes>,
+        WriteExpect<'a, GameLog>,
+        WriteExpect<'a, ParticleBuilder>,
+        ReadExpect<'a, Point>,
     );
 
     fn run(&mut self, data: Self::SystemData) {
-        let (mut stats, mut damage, positions, mut map, entities) = data;
+        let (
+            mut stats,
+            mut damage,
+            positions,
+            mut map,
+            entities,
+            player,
+            attributes,
+            mut log,
+            mut particles,
+            player_pos,
+        ) = data;
+        let mut xp_gain = 0;
 
         for (entity, mut stats, damage) in (&entities, &mut stats, &damage).join() {
-            stats.hit_points.current -= damage.amount.iter().sum::<i32>();
+            for dmg in damage.amount.iter() {
+                stats.hit_points.current -= dmg.0;
+                if let Some(pos) = positions.get(entity) {
+                    let idx = map.xy_idx(pos.x, pos.y);
+                    map.bloodstains.insert(idx);
+                }
 
-            if let Some(pos) = positions.get(entity) {
-                let idx = map.xy_idx(pos.x, pos.y);
-                map.bloodstains.insert(idx);
+                if stats.hit_points.current < 1 && dmg.1 {
+                    xp_gain += stats.level * 100;
+                }
+            }
+        }
+
+        if xp_gain != 0 {
+            let mut player_stats = stats.get_mut(*player).unwrap();
+            let player_attributes = attributes.get(*player).unwrap();
+            player_stats.xp += xp_gain;
+            if player_stats.xp >= player_stats.level * 1000 {
+                // We've gone up a level!
+                player_stats.level += 1;
+                log.append(format!(
+                    "Congratulations, you are now level {}",
+                    player_stats.level
+                ));
+                player_stats.hit_points.max = player_hp_at_level(
+                    player_attributes.fitness.base + player_attributes.fitness.modifiers,
+                    player_stats.level,
+                );
+                player_stats.hit_points.current = player_stats.hit_points.max;
+                player_stats.mana.max = mana_at_level(
+                    player_attributes.intelligence.base + player_attributes.intelligence.modifiers,
+                    player_stats.level,
+                );
+                player_stats.mana.current = player_stats.mana.max;
+
+                for i in 0..10 {
+                    if player_pos.y - i > 1 {
+                        particles.request(
+                            player_pos.x,
+                            player_pos.y - 1,
+                            RGB::named(rltk::GOLD),
+                            RGB::named(rltk::BLACK),
+                            rltk::to_cp437('░'),
+                            400.0,
+                        );
+                    }
+                }
             }
         }
 

src/gui.rs

@@ -82,8 +82,10 @@ pub fn draw_ui(ecs: &World, ctx: &mut Rltk) {
         "Mana:   {}/{}",
         player_pools.mana.current, player_pools.mana.max
     );
+    let xp = format!("Level: {}", player_pools.level);
     ctx.print_color(50, 1, white, black, &health);
     ctx.print_color(50, 2, white, black, &mana);
+    ctx.print_color(50, 3, white, black, &xp);
     ctx.draw_bar_horizontal(
         64,
         1,
@@ -102,6 +104,16 @@ pub fn draw_ui(ecs: &World, ctx: &mut Rltk) {
         RGB::named(rltk::BLUE),
         RGB::named(rltk::BLACK),
     );
+    let xp_level_start = (player_pools.level - 1) * 1000;
+    ctx.draw_bar_horizontal(
+        64,
+        3,
+        14,
+        player_pools.xp - xp_level_start,
+        1000,
+        RGB::named(rltk::GOLD),
+        black,
+    );
 
     // Attributes
     let attributes = ecs.read_storage::<Attributes>();

src/hunger_system.rs

@@ -73,7 +73,7 @@ impl<'a> System<'a> for HungerSystem {
                                 log.append("Your hunger pangs are getting painful!");
                             }
 
-                            SufferDamage::new_damage(&mut inflict_damage, entity, 1);
+                            SufferDamage::new_damage(&mut inflict_damage, entity, 1, false);
                         }
                     }
                 }

src/inventory_system.rs

@@ -270,7 +270,7 @@ impl<'a> System<'a> for ItemUseSystem {
                     used_item = false;
 
                     for mob in targets.iter() {
-                        SufferDamage::new_damage(&mut suffer_damage, *mob, damage.damage);
+                        SufferDamage::new_damage(&mut suffer_damage, *mob, damage.damage, true);
                         if entity == *player_entity {
                             let mob_name = names.get(*mob).unwrap();
                             let item_name = names.get(useitem.item).unwrap();

src/melee_combat_system.rs

@@ -31,6 +31,7 @@ impl<'a> System<'a> for MeleeCombatSystem {
         ReadStorage<'a, MeleeWeapon>,
         ReadStorage<'a, Wearable>,
         ReadStorage<'a, NaturalAttackDefense>,
+        ReadExpect<'a, Entity>,
     );
 
     fn run(&mut self, data: Self::SystemData) {
@@ -51,6 +52,7 @@ impl<'a> System<'a> for MeleeCombatSystem {
             meleeweapons,
             wearables,
             natural,
+            player_entity,
         ) = data;
 
         for (entity, wants_melee, name, attacker_attributes, attacker_skills, attacker_pools) in (
@@ -154,7 +156,12 @@ impl<'a> System<'a> for MeleeCombatSystem {
                             + skill_damage_bonus
                             + weapon_damage_bonus,
                     );
-                    SufferDamage::new_damage(&mut inflict_damage, wants_melee.target, damage);
+                    SufferDamage::new_damage(
+                        &mut inflict_damage,
+                        wants_melee.target,
+                        damage,
+                        entity == *player_entity,
+                    );
                     log.append(format!(
                         "{} hits {} for {} hp.",
                         &name.name, &target_name.name, damage

src/trigger_system.rs

@@ -77,6 +77,7 @@ impl<'a> System<'a> for TriggerSystem {
                                     &mut inflict_damage,
                                     entity,
                                     damage.damage,
+                                    false,
                                 );
                             }