From 752b8c4b4703a5bc43d32b815aa713fab12e653c Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Thu, 6 Jul 2023 22:06:28 +0100
Subject: Add free enemy (Old Miner)

---
 src/old.c | 158 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 158 insertions(+)
 create mode 100644 src/old.c

(limited to 'src/old.c')

diff --git a/src/old.c b/src/old.c
new file mode 100644
index 0000000..3451118
--- /dev/null
+++ b/src/old.c
@@ -0,0 +1,158 @@
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "vga.h"
+#include "map.h"
+#include "entities.h"
+
+#include "player.h"
+
+#include "old.h"
+
+#define FRAME_STANDING 0
+#define FRAME_JUMPING 1
+#define WALK_CYCLE_FRAMES 4
+
+#define JUMP_DELAY 2
+
+static const Rect frames[2 * 4] =
+{
+    /* right */
+    { 0, 80, 144, 144 },
+    { 16, 80, 144, 144 },
+    { 0, 80, 144, 144 },
+    { 32, 80, 144, 144 },
+
+    /* left */
+    { 48, 80, 144, 144 },
+    { 64, 80, 144, 144 },
+    { 48, 80, 144, 144 },
+    { 80, 80, 144, 144 },
+};
+
+void old_init(Entity *e)
+{
+    e->frames = (const Rect *)frames;
+    e->update = old_update;
+}
+
+static uint8_t is_bottom_deadly(uint16_t x, uint16_t y)
+{
+    while (1)
+    {
+        if (map_is_deadly(x, y))
+            return 1;
+
+        if (map_is_blocked(x, y))
+            return 0;
+
+        y += 8;
+    }
+}
+
+void old_update(Entity *e)
+{
+    if (e->gravity == GRAVITY_OFF
+            && !map_is_blocked(e->x + 4, e->y + 16)
+            && !map_is_blocked(e->x + 11, e->y + 16))
+    {
+        e->gravity = GRAVITY_DOWN;
+        e->frame = FRAME_JUMPING;
+    }
+
+    if (e->gravity != GRAVITY_OFF)
+    {
+        uint8_t steps = gravity_seq[e->gravity - 1];
+
+        if (e->gravity > GRAVITY_DOWN)
+        {
+            /* going down! */
+            for (uint8_t i = 0; i < steps; i++)
+            {
+                /* hit the floor */
+                if ((map_is_blocked(e->x + 11, e->y + 16)
+                        || map_is_blocked(e->x + 4, e->y + 16))
+                        && !map_is_blocked(e->x + 4, e->y + 15)
+                        && !map_is_blocked(e->x + 11, e->y + 15))
+                {
+                    e->gravity = GRAVITY_OFF;
+                    e->frame = FRAME_STANDING;
+                    e->flags = rand() % (JUMP_DELAY * 2);
+                    break;
+                }
+                e->y++;
+            }
+        }
+        else
+        {
+            /* going up! */
+            if (e->y < steps)
+                e->y = 0;
+            else
+                e->y -= steps;
+        }
+
+        if (e->gravity != GRAVITY_OFF && e->gravity != GRAVITY_SEQ_LEN)
+            e->gravity++;
+    }
+    else
+    {
+        if (e->delay & 1)
+        {
+            if (e->dir == DIR_RIGHT)
+            {
+                if (map_is_blocked(e->x + 16, e->y + 15)
+                        || is_bottom_deadly(e->x + 16, e->y + 16))
+                {
+                    e->dir = DIR_LEFT;
+                    e->flags++;
+                }
+                else
+                    e->x++;
+
+                if (e->flags > JUMP_DELAY
+                        && map_is_blocked(e->x + 7, e->y - 1)
+                        && !map_is_blocked(e->x + 7, e->y - 9))
+                {
+                    e->gravity = GRAVITY_UP;
+                    e->frame = FRAME_JUMPING;
+                }
+            }
+            else
+            {
+                /* dir is LEFT */
+                if (map_is_blocked(e->x - 1, e->y + 15)
+                        || is_bottom_deadly(e->x - 1, e->y + 16))
+                {
+                    e->dir = DIR_RIGHT;
+                    e->flags++;
+                }
+                else
+                    e->x--;
+
+                if (e->flags > JUMP_DELAY
+                        && map_is_blocked(e->x + 7, e->y - 1)
+                        && !map_is_blocked(e->x + 7, e->y - 9))
+                {
+                    e->gravity = GRAVITY_UP;
+                    e->frame = FRAME_JUMPING;
+                }
+            }
+        }
+
+        if (e->delay++ == WALK_DELAY)
+        {
+            e->delay = 0;
+            e->frame++;
+            if (e->frame == WALK_CYCLE_FRAMES)
+                e->frame = FRAME_STANDING;
+        }
+    }
+
+    if (player_collision(e))
+    {
+        player_hit();
+        /* change direction */
+        e->dir ^= 1;
+    }
+}
-- 
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