From e236632ceea7a7cbee7c4139b0bf86710770077b Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Thu, 19 Aug 2021 16:33:09 -0400
Subject: char/enemy: Fix movement upon collision after turn

---
(limited to 'src/char/enemy.c')

diff --git a/src/char/enemy.c b/src/char/enemy.c
index 6b1440f..eeda38d 100644
--- a/src/char/enemy.c
+++ b/src/char/enemy.c
@@ -112,6 +112,36 @@ _mf_enemy_step(struct mf_char *c)
 static int
 _mf_enemy_turn(struct mf_char *c)
 {
+	struct mf_enemy *e = (struct mf_enemy *) c;
+	int              dx;
+	int              dy;
+	int              i;
+
+	switch (c->cur_dir) {
+		case MF_CHAR_DIR_U_: dx =  0; dy = -1; break;
+		case MF_CHAR_DIR_D_: dx =  0; dy =  1; break;
+		case MF_CHAR_DIR_L_: dx = -1; dy =  0; break;
+		case MF_CHAR_DIR_R_: dx =  1; dy =  0; break;
+		default:             dx =  0; dy =  0; break;
+	}
+
+	for (i = 0; i < e->num_allies; ++i) {
+		if (e->allies[i] == c) {
+			/* Found self */
+			continue;
+		}
+		if (e->allies[i]->cur_x == c->cur_x + dx &&
+				e->allies[i]->cur_y == c->cur_y + dy) {
+			/* Another enemy currently in this direction */
+			return 0;
+		}
+		if (e->allies[i]->new_x == c->cur_x + dx &&
+				e->allies[i]->new_y == c->cur_y + dy) {
+			/* Another enemy moving in this direction */
+			return 0;
+		}
+	}
+
 	/* Go straight */
 	c->new_dir = c->cur_dir;
 
--
cgit v0.9.1