From 0e9a1403546b510b3c05a218a87afd29c99ee434 Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Thu, 6 Jul 2023 22:19:15 +0100
Subject: Add tracker enemy (Mr Bones)

---
 data/stage.json |  4 ++--
 src/bones.c     | 45 +++++++++++++++++++++++++++++++++++++++++++++
 src/bones.h     |  7 +++++++
 src/map.c       |  2 ++
 tools/map.py    |  2 +-
 5 files changed, 57 insertions(+), 3 deletions(-)
 create mode 100644 src/bones.c
 create mode 100644 src/bones.h

diff --git a/data/stage.json b/data/stage.json
index 5276e5d..5758a5b 100644
--- a/data/stage.json
+++ b/data/stage.json
@@ -150,7 +150,7 @@
                  "type":"",
                  "visible":true,
                  "width":16,
-                 "x":96,
+                 "x":192,
                  "y":152
                 }, 
                 {
@@ -184,7 +184,7 @@
                 {
                  "height":16,
                  "id":9,
-                 "name":"Snake",
+                 "name":"Bones",
                  "properties":[
                         {
                          "name":"dir",
diff --git a/src/bones.c b/src/bones.c
new file mode 100644
index 0000000..f5d7f42
--- /dev/null
+++ b/src/bones.c
@@ -0,0 +1,45 @@
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "vga.h"
+#include "map.h"
+#include "entities.h"
+
+#include "player.h"
+#include "old.h"
+
+#include "bones.h"
+
+static const Rect frames[2 * 4] =
+{
+    /* right */
+    { 0, 96, 144, 144 },
+    { 16, 96, 144, 144 },
+    { 0, 96, 144, 144 },
+    { 32, 96, 144, 144 },
+
+    /* left */
+    { 48, 96, 144, 144 },
+    { 64, 96, 144, 144 },
+    { 48, 96, 144, 144 },
+    { 80, 96, 144, 144 },
+};
+
+void bones_init(Entity *e)
+{
+    e->frames = (const Rect *)frames;
+    e->update = bones_update;
+}
+
+void bones_update(Entity *e)
+{
+    if (abs(player_y() - e->y) < 8)
+    {
+        if (player_x() > e->x && e->dir != DIR_RIGHT)
+            e->dir = DIR_RIGHT;
+        if (player_x() < e->x && e->dir != DIR_LEFT)
+            e->dir = DIR_LEFT;
+    }
+
+    old_update(e);
+}
diff --git a/src/bones.h b/src/bones.h
new file mode 100644
index 0000000..b0e8d7e
--- /dev/null
+++ b/src/bones.h
@@ -0,0 +1,7 @@
+#ifndef _BONES_H
+#define _BONES_H
+
+void bones_init(Entity *e);
+void bones_update(Entity *e);
+
+#endif /* _BONES_H */
diff --git a/src/map.c b/src/map.c
index bc7b283..e5e67d1 100644
--- a/src/map.c
+++ b/src/map.c
@@ -11,6 +11,7 @@
 #include "snake.h"
 #include "bat.h"
 #include "old.h"
+#include "bones.h"
 #include "pickup.h"
 
 #include "map.h"
@@ -25,6 +26,7 @@ static void (* const init[])(Entity *) =
     snake_init,
     bat_init,
     old_init,
+    bones_init,
     pickup_time_init,
     pickup_bonus_init,
     pickup_pickaxe_init,
diff --git a/tools/map.py b/tools/map.py
index 64d2063..6c18e82 100755
--- a/tools/map.py
+++ b/tools/map.py
@@ -10,7 +10,7 @@ __version__ = "1.0"
 ld = os.environ.get("LD", "i586-pc-msdosdjgpp-ld")
 strip = os.environ.get("STRIP", "i586-pc-msdosdjgpp-strip")
 
-entity_types = ("Player", "Snake", "Bat", "Old", "Time", "Bonus", "Pickaxe")
+entity_types = ("Player", "Snake", "Bat", "Old", "Bones", "Time", "Bonus", "Pickaxe")
 
 
 def get_layer(data, name):
-- 
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