Add tracker enemy (Mr Bones)

3 files changed, 54 insertions, 0 deletions

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,