--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libmlk-rpg/rpg/walksprite.c	Sat Nov 28 22:37:30 2020 +0100
@@ -0,0 +1,69 @@
+/*
+ * walksprite.c -- sprite designed for walking entities
+ *
+ * Copyright (c) 2020 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include <core/sprite.h>
+
+#include "walksprite.h"
+
+void
+walksprite_init(struct walksprite *ws, struct sprite *sprite, unsigned int delay)
+{
+	assert(ws);
+	assert(sprite);
+
+	memset(ws, 0, sizeof (*ws));
+	ws->sprite = sprite;
+	ws->delay = delay;
+}
+
+void
+walksprite_reset(struct walksprite *ws)
+{
+	assert(ws);
+
+	ws->index = 0;
+}
+
+void
+walksprite_update(struct walksprite *ws, unsigned int ticks)
+{
+	assert(ws);
+
+	ws->elapsed += ticks;
+
+	if (ws->elapsed >= ws->delay) {
+		ws->index += 1;
+
+		if (ws->index >= ws->sprite->ncols)
+			ws->index = 0;
+
+		ws->elapsed = 0;
+	}
+}
+
+void
+walksprite_draw(const struct walksprite *ws, unsigned int orientation, int x, int y)
+{
+	assert(ws);
+	assert(orientation < 8);
+
+	sprite_draw(ws->sprite, orientation, ws->index, x, y);
+}