Add read damage overlay

4 files changed, 47 insertions, 13 deletions

diff --git a/plugins/apple/apple.c b/plugins/apple/apple.c
index dd8a559..d8e7375 100644
--- a/plugins/apple/apple.c
+++ b/plugins/apple/apple.c
@@ -38,6 +38,7 @@ __attribute__((constructor)) static void init()
 		.on_spawn = NULL,
 		.on_remove = NULL,
 		.on_death = NULL,
+		.on_damage = NULL,
 	};
 
 	register_air_function((struct generator_function) {
diff --git a/plugins/game/game.c b/plugins/game/game.c
index ba5257a..c77a53c 100644
--- a/plugins/game/game.c
+++ b/plugins/game/game.c
@@ -14,6 +14,7 @@
 #include "game.h"
 
 bool running = true;
+double damage_overlay = 0.0;
 
 int score = 0;
 
@@ -115,6 +116,9 @@ void add_health(struct entity *entity, int health)
 
 	entity->health += health;
 
+	if (health < 0 && entity->on_damage)
+		entity->on_damage(entity, -health);
+
 	if (entity->health > entity->max_health)
 		entity->health = entity->max_health;
 	else if (entity->health <= 0 && was_alive && entity->on_death)
@@ -160,6 +164,11 @@ static void player_death(struct entity *self)
 	self->texture = "☠ ";
 }
 
+static void player_damage(struct entity *self, int damage)
+{
+	damage_overlay = (double) damage * 0.5;
+}
+
 /* Mapgen */
 
 static bool check_direction(int x, int y, int dir)
@@ -242,13 +251,34 @@ void set_color(struct color color, bool bg)
 	printf("\e[%u;2;%u;%u;%um", bg ? 48 : 38, color.r, color.g, color.b);
 }
 
-struct color light_color(struct color color, double light)
+void light_color(struct color *color, double light)
 {
-	return (struct color) {
-		color.r * light,
-		color.g * light,
-		color.b * light,
-	};
+	color->r *= light;
+	color->g *= light;
+	color->b *= light;
+}
+
+void mix_color(struct color *color, struct color other, double ratio)
+{
+	double ratio_total = ratio + 1;
+
+	color->r = (color->r + other.r * ratio) / ratio_total;
+	color->g = (color->g + other.g * ratio) / ratio_total;
+	color->b = (color->b + other.b * ratio) / ratio_total;
+}
+
+void render_color(struct color color, double light, bool bg)
+{
+	if (light <= 0.0) {
+		set_color(black, bg);
+	} else {
+		if (damage_overlay > 0.0)
+			mix_color(&color, get_color("#F20000"), damage_overlay * 2.0);
+
+		light_color(&color, light);
+
+		set_color(color, bg);
+	}
 }
 
 static void render(render_entity_list entity_list)
@@ -285,18 +315,14 @@ static void render(render_entity_list entity_list)
 			double dist = sqrt(x * x + y * y);
 			double light = 1.0 - (double) dist / (double) LIGHT;
 
-			if (light <= 0)
-				goto empty;
-
-			set_color(light_color(node.material->color, light), true);
+			render_color(node.material->color, light, true);
 
 			struct entity *entity = entity_list[x + LIGHT][y + LIGHT];
 
 			if (entity) {
-				set_color(entity->color, false);
+				render_color(entity->color, light, false);
 				printf("%s", entity->texture);
 			} else {
-				empty:
 				printf("  ");
 			}
 		}
@@ -425,6 +451,7 @@ __attribute__ ((constructor)) static void init()
 		.on_spawn = NULL,
 		.on_remove = NULL,
 		.on_death = &player_death,
+		.on_damage = &player_damage,
 	};
 
 	entity_collision_map[player.x][player.y] = &player;
@@ -468,6 +495,9 @@ void game()
 
 		bool dead = player_dead();
 
+		if (! dead && damage_overlay > 0.0)
+			damage_overlay -= dtime;
+
 		render_entity_list render_list = {{NULL}};
 
 		for (struct list **ptr = &entities; *ptr != NULL; ) {
diff --git a/plugins/game/game.h b/plugins/game/game.h
index 0463086..d5457a9 100644
--- a/plugins/game/game.h
+++ b/plugins/game/game.h
@@ -50,6 +50,7 @@ struct entity
 	void (*on_spawn)(struct entity *self);
 	void (*on_remove)(struct entity *self);
 	void (*on_death)(struct entity *self);
+	void (*on_damage)(struct entity *self, int damage);
 };
 
 struct list
@@ -94,7 +95,8 @@ void add_health(struct entity *entity, int health);
 void add_score(int s);
 bool player_dead();
 void set_color(struct color color, bool bg);
-struct color light_color(struct color color, double light);
+void light_color(struct color *color, double light);
+void mix_color(struct color *color, struct color other, double ratio);
 void register_air_function(struct generator_function func);
 struct list *add_element(struct list *list, void *element);
 
diff --git a/plugins/monster/monster.c b/plugins/monster/monster.c
index 6cb14ff..7124c76 100644
--- a/plugins/monster/monster.c
+++ b/plugins/monster/monster.c
@@ -63,6 +63,7 @@ __attribute__((constructor)) static void init()
 		.on_spawn = &monster_spawn,
 		.on_remove = NULL,
 		.on_death = &monster_death,
+		.on_damage = NULL,
 	};
 
 	register_air_function((struct generator_function) {