Add fireballs

2 files changed, 105 insertions, 0 deletions

diff --git a/plugins/fireball/Makefile b/plugins/fireball/Makefile
new file mode 100644
index 0000000..bc0a277
--- /dev/null
+++ b/plugins/fireball/Makefile
@@ -0,0 +1,4 @@
+plugins/fireball/fireball.so: plugins/fireball/fireball.c plugins/game/game.h
+	cc -g -shared -fpic -o plugins/fireball/fireball.so plugins/fireball/fireball.c
+
+PLUGINS := ${PLUGINS} plugins/fireball/fireball.so
diff --git a/plugins/fireball/fireball.c b/plugins/fireball/fireball.c
new file mode 100644
index 0000000..1c3eeb6
--- /dev/null
+++ b/plugins/fireball/fireball.c
@@ -0,0 +1,101 @@
+#include <stdlib.h>
+#include <stddef.h>
+#include "../game/game.h"
+
+static struct entity fireball;
+
+struct fireball_data
+{
+	double timer;
+	int vx;
+	int vy;
+};
+
+static void fireball_spawn(struct entity *self, void *data)
+{
+	self->meta = malloc(sizeof(struct fireball_data));
+	*((struct fireball_data *) self->meta) = *((struct fireball_data *) data);
+}
+
+static void fireball_step(struct entity *self, struct entity_step_data stepdata)
+{
+	struct fireball_data *data = self->meta;
+
+	if (stepdata.visible && (data->timer -= stepdata.dtime) <= 0.0) {
+		data->timer = 0.1;
+		move(self, data->vx, data->vy);
+	}
+}
+
+static void fireball_collide(struct entity *self, int x, int y)
+{
+	(void) x, y;
+
+	self->remove = true;
+}
+
+static void fireball_collide_with_entity(struct entity *self, struct entity *other)
+{
+	add_health(other, -(1 + rand() % 3));
+	self->remove = true;
+}
+
+static bool try_shoot(int x, int y, int vx, int vy)
+{
+	x += vx;
+	y += vy;
+
+	return spawn(fireball, x, y, & (struct fireball_data) {
+		.timer = 0.1,
+		.vx = vx,
+		.vy = vy,
+	});
+}
+
+static void shoot_fireball()
+{
+	int x, y;
+
+	x = player.x;
+	y = player.y;
+
+	for (int tries = 10; tries > 0; tries--) {
+		int vx, vy;
+
+		vx = vy = 0;
+
+		dir_to_xy(rand() % 4, &vx, &vy);
+
+		if (try_shoot(x, y, vx, vy))
+			return;
+	}
+}
+
+__attribute__((constructor)) static void init()
+{
+	fireball = (struct entity) {
+		.name = "fireball",
+		.x = 0,
+		.y = 0,
+		.color = get_color("#FF6611"),
+		.texture = "⬤ ",
+		.remove = false,
+		.meta = NULL,
+		.health = 1,
+		.max_health = 1,
+		.collide_with_entities = true,
+
+		.on_step = &fireball_step,
+		.on_collide = &fireball_collide,
+		.on_collide_with_entity = &fireball_collide_with_entity,
+		.on_spawn = &fireball_spawn,
+		.on_remove = NULL,
+		.on_death = NULL,
+		.on_damage = NULL,
+	};
+
+	register_input_handler(' ', (struct input_handler) {
+		.run_if_dead = false,
+		.callback = &shoot_fireball,
+	});
+}