Shoot fireballs into last movement direction

plugins/fireball/dependencies.txt

@@ -1 +1,2 @@
 game
+movement

plugins/fireball/fireball.c

@@ -1,6 +1,7 @@
 #include <stdlib.h>
 #include <stddef.h>
 #include "../game/game.h"
+#include "../movement/movement.h"
 
 static struct entity fireball;
 
@@ -44,37 +45,20 @@ static void fireball_collide_with_entity(struct entity *self, struct entity *oth
 	self->remove = true;
 }
 
-static bool try_shoot(int x, int y, int vx, int vy)
+static void shoot_fireball()
 {
-	x += vx;
-	y += vy;
+	int vx, vy;
+	vx = vy = 0;
 
-	return spawn(fireball, x, y, & (struct fireball_data) {
+	dir_to_xy(last_player_move, &vx, &vy);
+
+	spawn(fireball, player.x + vx, player.y + vy, & (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) {

plugins/game/game.c

@@ -172,20 +172,20 @@ void register_input_handler(unsigned char c, struct input_handler handler)
 	input_handlers[c] = buf;
 }
 
-void dir_to_xy(int dir, int *x, int *y)
+void dir_to_xy(enum direction dir, int *x, int *y)
 {
 	switch (dir) {
-		case 0:
-			(*x)++;
+		case UP:
+			(*y)--;
 			break;
-		case 1:
-			(*y)++;
-			break;
-		case 2:
+		case LEFT:
 			(*x)--;
 			break;
-		case 3:
-			(*y)--;
+		case DOWN:
+			(*y)++;
+			break;
+		case RIGHT:
+			(*x)++;
 			break;
 	}
 }
@@ -209,15 +209,15 @@ static void player_damage(struct entity *self, int damage)
 
 /* Mapgen */
 
-static bool check_direction(int x, int y, int dir)
+static bool check_direction(int x, int y, enum direction dir)
 {
 	if (dir % 2 == 0)
-		return is_solid(x, y + 1) && is_solid(x, y - 1) && (is_solid(x + 1, y) || rand() % 3 > 1) && (is_solid(x - 1, y) || rand() % 3 > 1);
-	else
 		return is_solid(x + 1, y) && is_solid(x - 1, y) && (is_solid(x, y + 1) || rand() % 3 > 1) && (is_solid(x, y - 1) || rand() % 3 > 1);
+	else
+		return is_solid(x, y + 1) && is_solid(x, y - 1) && (is_solid(x + 1, y) || rand() % 3 > 1) && (is_solid(x - 1, y) || rand() % 3 > 1);
 }
 
-static void generate_corridor(int lx, int ly, int ldir, bool off)
+static void generate_corridor(int lx, int ly, enum direction ldir, bool off)
 {
 	if (is_outside(lx, ly))
 		return;
@@ -237,8 +237,11 @@ static void generate_corridor(int lx, int ly, int ldir, bool off)
 		}
 	}
 
-	int x, y, dir;
-	int ret = (ldir + 2) % 4;
+	int x, y;
+
+	enum direction dir;
+	enum direction ret = (ldir + 2) % 4;
+
 	int limit = 50;
 
 	do {
@@ -262,7 +265,7 @@ static void generate_corridor(int lx, int ly, int ldir, bool off)
 
 static void generate_corridor_random(int x, int y)
 {
-	int dir = rand() % 4;
+	enum direction dir = rand() % 4;
 
 	generate_corridor(x, y, dir, false);
 	generate_corridor(x, y, (dir + 2) % 4, false);

plugins/game/game.h

@@ -73,6 +73,14 @@ struct input_handler
 	void (*callback)();
 };
 
+enum direction
+{
+	UP,
+	LEFT,
+	DOWN,
+	RIGHT,
+};
+
 extern int score;
 
 extern struct color black;
@@ -107,7 +115,7 @@ 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);
 void register_input_handler(unsigned char c, struct input_handler handler);
-void dir_to_xy(int dir, int *x, int *y);
+void dir_to_xy(enum direction dir, int *x, int *y);
 int clamp(int v, int max, int min);
 struct list *add_element(struct list *list, void *element);
 

plugins/movement/movement.c

@@ -1,23 +1,36 @@
 #include "../game/game.h"
 
+enum direction last_player_move;
+
+void move_player(enum direction dir)
+{
+	int x, y;
+	x = y = 0;
+
+	dir_to_xy(dir, &x, &y);
+	last_player_move = dir;
+
+	move(&player, x, y);
+}
+
 static void move_up()
 {
-	move(&player, 0, -1);
+	move_player(UP);
 }
 
 static void move_left()
 {
-	move(&player, -1, 0);
+	move_player(LEFT);
 }
 
 static void move_down()
 {
-	move(&player, 0, 1);
+	move_player(DOWN);
 }
 
 static void move_right()
 {
-	move(&player, 1, 0);
+	move_player(RIGHT);
 }
 
 __attribute__((constructor)) static void init()

plugins/movement/movement.h

@@ -0,0 +1,8 @@
+#ifndef _MOVEMENT_H_
+#define _MOVEMENT_H_
+#include "../game/game.h"
+
+extern enum direction last_player_move;
+void move_player(enum direction dir);
+
+#endif