Add health

game/systems/s_entity.c

@@ -270,9 +270,45 @@ void updateBuildingRecruitment(ecs_iter_t *it) {
     }
 }
 
+void renderHealth(ecs_iter_t *it) {
+    Position *pos = ecs_field(it, Position, 1);
+    HitBox *hitbox = ecs_field(it, HitBox, 2);
+    Health *health = ecs_field(it, Health, 3);
+
+    for (i32 i = 0; i < it->count; i++) {
+        HitBox hb = entityTransformHitBox(pos[i], hitbox[i]);
+        const f32 HP_WIDTH = 10.0f;
+        const f32 HP_HEIGHT = 1.8f;
+        const f32 HP_OFFSET = 2.0f;
+
+        const Color BG_COLOR = {0, 0, 0, 60};
+        const Color HP_COLOR = {255, 0, 0, 220};
+
+        const f32 PADDING = 0.15f;
+
+        Vector2 hpPos = {
+                hb.x + (hb.width - HP_WIDTH) * 0.5f,
+                hb.y - HP_OFFSET - HP_HEIGHT
+        };
+        Vector2 size = {
+                HP_WIDTH, HP_HEIGHT
+        };
+        f32 hpPercent = health[i].hp / health[i].startHP;
+        Vector2 hpSize = {
+                HP_WIDTH * hpPercent - PADDING * 2.0f,
+                HP_HEIGHT - PADDING * 2.0f
+        };
+
+        DrawRectangleV(hpPos, size, BG_COLOR);
+        hpPos.x += PADDING;
+        hpPos.y += PADDING;
+        DrawRectangleV(hpPos, hpSize, HP_COLOR);
+    }
+}
+
 void renderColliders(ecs_iter_t *it) {
     Position *pos = ecs_field(it, Position, 1);
-    HitBox *hitbox = ecs_field(it, HitBox , 2);
+    HitBox *hitbox = ecs_field(it, HitBox, 2);
 
     for (i32 i = 0; i < it->count; i++) {
         HitBox hb = entityTransformHitBox(pos[i], hitbox[i]);

game/systems/systems.c

@@ -113,6 +113,7 @@ void setupSystems() {
     ECS_SYSTEM(ECS, updateAnimation, EcsOnUpdate, Animation, TextureRegion);
     ECS_SYSTEM(ECS, updateEasingSystem, EcsOnUpdate, Easing, Position, HitBox, Rotation);
 
+    ECS_SYSTEM(ECS, renderHealth, EcsOnUpdate, Position, HitBox, Health);
     ECS_SYSTEM(ECS, renderDebugPath, EcsOnUpdate, Path);
 
     ECS_SYSTEM(ECS, renderColliders, EcsOnUpdate, Position, HitBox);

game/systems/systems.h

@@ -147,6 +147,13 @@ void entityFollowPath(ecs_iter_t *it);
  */
 void updateBuildingRecruitment(ecs_iter_t *it);
 
+/*
+ * 1: Position
+ * 2: HitBox
+ * 3: Health
+ */
+void renderHealth(ecs_iter_t *it);
+
 /*
  * 1: Position
  * 2: HitBox