--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/example-battle.c	Sat Nov 07 16:00:39 2020 +0100
@@ -0,0 +1,266 @@
+/*
+ * example-battle.c -- show how to use battle
+ *
+ * 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 <stdio.h>
+#include <string.h>
+
+#include <core/clock.h>
+#include <core/core.h>
+#include <core/event.h>
+#include <core/image.h>
+#include <core/painter.h>
+#include <core/panic.h>
+#include <core/sprite.h>
+#include <core/sys.h>
+#include <core/texture.h>
+#include <core/util.h>
+#include <core/window.h>
+
+#include <ui/align.h>
+#include <ui/label.h>
+#include <ui/theme.h>
+#include <ui/ui.h>
+
+#include <rpg/character.h>
+#include <rpg/battle.h>
+#include <rpg/rpg.h>
+#include <rpg/spell.h>
+
+#include "battle/registry.h"
+#include "battle/spell-fire.h"
+
+#define W 1280
+#define H 720
+
+static void
+adventurer_reset(struct character *ch)
+{
+	/* TODO: this function should compute the attack thanks to the level. */
+	ch->hpmax = 120;
+	ch->mpmax = 50;
+	ch->atk = 50;
+	ch->def = 50;
+	ch->agt = 50;
+	ch->luck = 50;
+}
+
+static void
+haunted_wood_reset(struct character *ch)
+{
+	ch->hpmax = ch->hp = 2000;
+	ch->mpmax = ch->mp = 250;
+	ch->atk = 178;
+	ch->def = 80;
+	ch->agt = 80;
+	ch->luck = 100;
+}
+
+static void
+black_cat_reset(struct character *ch)
+{
+	ch->hpmax = ch->hp = 126;
+	ch->mpmax = ch->mp = 38;
+	ch->atk = 22;
+	ch->def = 19;
+	ch->agt = 21;
+	ch->luck = 14;
+}
+
+static struct character team[] = {
+	{
+		.name = "Molko",
+		.type = "Adventurer",
+		.level = 1,
+		.hp = 120,
+		.mp = 50,
+		.reset = adventurer_reset,
+		.sprite = &registry_sprites[REGISTRY_TEXTURE_JOHN],
+		.spells = {
+			&spell_fire
+		}
+	},
+	{
+		.name = "Fake Molko",
+		.type = "Adventurer",
+		.level = 1,
+		.hp = 120,
+		.mp = 50,
+		.reset = adventurer_reset,
+		.sprite = &registry_sprites[REGISTRY_TEXTURE_JOHN],
+		.spells = {
+			&spell_fire
+		}
+	}
+};
+
+static void
+haunted_wood_strat(struct character *ch, struct battle *bt)
+{
+	(void)ch;
+
+	/* TODO: Select randomly. */
+	battle_attack(bt, bt->order_cur->ch, bt->team[0].ch);
+}
+
+static void
+black_cat_strat(struct character *ch, struct battle *bt)
+{
+	(void)ch;
+
+	/* TODO: Select randomly. */
+	battle_attack(bt, bt->order_cur->ch, bt->team[0].ch);
+}
+
+static struct character haunted_wood = {
+	.name = "Haunted Wood",
+	.type = "Wood",
+	.level = 30,
+	.reset = haunted_wood_reset,
+	.sprite = &registry_sprites[REGISTRY_TEXTURE_HAUNTED_WOOD],
+	.exec = haunted_wood_strat
+};
+
+static struct character black_cat = {
+	.name = "Black Cat",
+	.type = "Cat",
+	.level = 6,
+	.reset = black_cat_reset,
+	.sprite = &registry_sprites[REGISTRY_TEXTURE_BLACK_CAT],
+	.exec = black_cat_strat
+};
+
+static void
+init(void)
+{
+	struct clock clock = {0};
+
+	if (!core_init() || !ui_init() || !rpg_init())
+		panic();
+	if (!window_open("Example - Battle", W, H))
+		panic();
+
+	/* Wait 1 second to let all events processed. */
+	while (clock_elapsed(&clock) < 1000)
+		for (union event ev; event_poll(&ev); )
+			if (ev.type == EVENT_QUIT)
+				return;
+
+	registry_init();
+
+	/* Set cursor in default theme. */
+	theme_default()->sprites[THEME_SPRITE_CURSOR] = &registry_sprites[REGISTRY_TEXTURE_CURSOR];
+}
+
+static void
+prepare_to_fight(struct battle *bt)
+{
+	assert(bt);
+
+//	bt->enemies[0].ch = &haunted_wood;
+	bt->team[0].ch = &team[0];
+	bt->team[1].ch = &team[1];
+
+	/* Positionate the single ennemy to the left. */
+	align(ALIGN_LEFT,
+	    &bt->enemies[0].x, &bt->enemies[0].y, haunted_wood.sprite->cellw, haunted_wood.sprite->cellh,
+	    0, 0, window.w, window.h);
+
+	/* Black cat is near the previous monster. */
+	bt->enemies[1].ch = &black_cat;
+	bt->enemies[1].x = 500;
+	bt->enemies[1].y = 100;
+
+	battle_start(bt);
+}
+
+static void
+run(void)
+{
+	struct clock clock;
+	struct battle battle = {0};
+	struct label info = {
+		.text = "Press <Space> to start a battle.",
+		.x = 10,
+		.y = 10,
+		.flags = LABEL_FLAGS_SHADOW
+	};
+
+	clock_start(&clock);
+
+	for (;;) {
+		unsigned int elapsed = clock_elapsed(&clock);
+
+		clock_start(&clock);
+
+		for (union event ev; event_poll(&ev); ) {
+			switch (ev.type) {
+			case EVENT_QUIT:
+				return;
+			case EVENT_KEYDOWN:
+				if (ev.key.key == KEY_SPACE && !battle.state)
+					prepare_to_fight(&battle);
+				else if (battle.state)
+					battle_handle(&battle, &ev);
+				break;
+			default:
+				if (battle.state)
+					battle_handle(&battle, &ev);
+				break;
+			}
+		}
+
+		if (battle.state) {
+			if (battle_update(&battle, elapsed))
+				battle_finish(&battle);
+			else
+				battle_draw(&battle);
+		} else {
+			painter_set_color(0x4f8fbaff);
+			painter_clear();
+			label_draw(&info);
+		}
+
+		painter_present();
+
+		if ((elapsed = clock_elapsed(&clock)) < 20)
+			delay(1);
+	}
+}
+
+static void
+quit(void)
+{
+	registry_finish();
+	theme_finish();
+	window_finish();
+	sys_finish();
+}
+
+int
+main(int argc, char **argv)
+{
+	--argc;
+	++argv;
+
+	init();
+	run();
+	quit();
+
+	return 0;
+}