From 483d5cf42b38828e152561817769bd4155612c99 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Thu, 19 Aug 2021 15:18:43 -0400
Subject: char/enemy: Add collision avoidance

---
(limited to 'src/char')

diff --git a/src/char/enemy.c b/src/char/enemy.c
index b8836fb..0644ed3 100644
--- a/src/char/enemy.c
+++ b/src/char/enemy.c
@@ -39,6 +39,7 @@ _mf_enemy_update(struct mf_char *c __attribute__((__unused__)))
 static int
 _mf_enemy_step(struct mf_char *c)
 {
+	struct mf_enemy   *e       = (struct mf_enemy *) c;
 	enum _mf_char_dir  dirs[4] = {MF_CHAR_DIR_U_, MF_CHAR_DIR_D_,
 	                              MF_CHAR_DIR_L_, MF_CHAR_DIR_R_};
 	int                i;
@@ -84,9 +85,27 @@ _mf_enemy_step(struct mf_char *c)
 			/* Wall ahead; don't go this direction. */
 			continue;
 		}
+		for (j = 0; j < e->num_allies; ++j) {
+			if (e->allies[j] == c) {
+				/* Found self */
+				continue;
+			}
+			if (e->allies[j]->cur_x == c->cur_x + dx &&
+					e->allies[j]->cur_y == c->cur_y + dy) {
+				/* Another enemy currently in this direction */
+				goto next_dir;
+			}
+			if (e->allies[j]->new_x == c->cur_x + dx &&
+					e->allies[j]->new_y == c->cur_y + dy) {
+				/* Another enemy moving in this direction */
+				goto next_dir;
+			}
+		}
 		/* Move */
 		c->new_dir = dirs[i];
 		return 0;
+ next_dir:
+		continue;
 	}
 
 	return 0;
--
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