Function Script_Structure_RotateTurret

src/script/structure.c:375–428

* Rotate the turret to look at a tile. * * Stack: 1 - Tile to look at. * * @param script The script engine to operate on. * @return 0 if looking at target, otherwise 1. */

 * @return 0 if looking at target, otherwise 1.
 */
uint16 Script_Structure_RotateTurret(ScriptEngine *script)
{
	Structure *s;
	tile32 lookAt;
	Tile *tile;
	uint16 baseTileID;
	uint16 encoded;
	int16 rotation;
	int16 rotationNeeded;
	int16 rotateDiff;

	encoded = STACK_PEEK(1);

	if (encoded == 0) return 0;

	s      = g_scriptCurrentStructure;
	lookAt = Tools_Index_GetTile(encoded);
	tile   = &g_map[Tile_PackTile(s->o.position)];

	/* Find the base sprite of the structure */
	if (s->o.type == STRUCTURE_ROCKET_TURRET) {
		baseTileID = g_iconMap[g_iconMap[ICM_ICONGROUP_BASE_ROCKET_TURRET] + 2];
	} else {
		baseTileID = g_iconMap[g_iconMap[ICM_ICONGROUP_BASE_DEFENSE_TURRET] + 2];
	}

	rotation = tile->groundTileID - baseTileID;
	if (rotation < 0 || rotation > 7) return 1;

	/* Find what rotation we should have to look at the target */
	rotationNeeded = Orientation_Orientation256ToOrientation8(Tile_GetDirection(s->o.position, lookAt));

	/* Do we need to rotate */
	if (rotationNeeded == rotation) return 0;

	/* Find the fastest way to rotate to the correct rotation */
	rotateDiff = rotationNeeded - rotation;
	if (rotateDiff < 0) rotateDiff += 8;

	if (rotateDiff < 4) {
		rotation++;
	} else {
		rotation--;
	}
	rotation &= 0x7;

	/* Set the new sprites */
	tile->groundTileID = baseTileID + rotation;
	s->rotationSpriteDiff = rotation;

	Map_Update(Tile_PackTile(s->o.position), 0, false);

	return 1;
}

/**
 * Find the direction a tile is, seen from the structure. If the tile is