From 05f7acb92dcf9812678857b25e9899a4adf84439 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Mon, 09 Aug 2021 01:12:29 -0400
Subject: char/enemy: Fix anti-backtracking

---
(limited to 'src')

diff --git a/src/char/enemy.c b/src/char/enemy.c
index edfd5c3..e480d10 100644
--- a/src/char/enemy.c
+++ b/src/char/enemy.c
@@ -42,6 +42,7 @@ _mf_enemy_step(struct mf_char *c)
 	int               i;
 	int               j;
 	int               t;
+	enum _mf_char_dir back;
 	int               dx;
 	int               dy;
 
@@ -52,8 +53,17 @@ _mf_enemy_step(struct mf_char *c)
 		dirs[i] = dirs[j];
 		dirs[j] = t;
 	}
+
+	/* Don't go backwards unless necessary */
+	switch (c->cur_dir) {
+		case MF_CHAR_DIR_U_: back = MF_CHAR_DIR_D_; break;
+		case MF_CHAR_DIR_D_: back = MF_CHAR_DIR_U_; break;
+		case MF_CHAR_DIR_L_: back = MF_CHAR_DIR_R_; break;
+		case MF_CHAR_DIR_R_: back = MF_CHAR_DIR_L_; break;
+		default:             back = MF_CHAR_DIR_N_; break;
+	}
 	for (i = 0; i < 3; ++i) {
-		if (dirs[i] == c->cur_dir) {
+		if (dirs[i] == back) {
 			t       = dirs[i];
 			dirs[i] = dirs[3];
 			dirs[3] = t;
--
cgit v0.9.1