Nightshade: Routine at 55308

55308: Update Thrown Item

The routine for objects of type 8 to 11, the items that the player has thrown. The item flies in a straight line. If it hits the object that is four places along the object table (the monster that it belongs to), the monster is destroyed, 37 hundred points are added to the score and the monster explodes into fragments. If the item hits something else, it lands and becomes an item that can be picked up again (type 4 to 7).
UpdateThrownItem	55308	LD A,(IX+5)	Set the velocity of the item from its speed and direction.
	55311	CALL SetVelocityFromSpeed	Set the velocity of the item from its speed and direction.
	55314	CALL TestMove	Check whether the scenery blocks the move along one axis.
	55317	CALL MoveObject	Move the item.
	55320	CALL TestMove_Keep	Check whether the scenery blocks the move along the other axis.
	55323	CALL MoveObject	Move the item.
	55326	CALL CheckOverlapWithNextObject	Check whether the item has hit its monster, and jump to UpdateThrownItem_Hit if it has.
	55329	JR C,UpdateThrownItem_Hit
	55331	BIT 0,(IX+7)	Return if the item has not hit the scenery.
	55335	RET Z	Return if the item has not hit the scenery.
	55336	LD A,(IX+0)	Change the type of the item to the one for an item that is lying on the ground, and return.
	55339	AND 3
	55341	OR 4
	55343	LD (IX+0),A
	55346	RET
The item has hit its monster.
UpdateThrownItem_Hit	55347	LD (IY+0),132	Change the monster into a flash (type 132).
	55351	LD (IX+0),12	Turn the item into a burst.
	55355	LD BC,9472	Add 37 hundred points to the score.
	55358	CALL AddToScore	Add 37 hundred points to the score.
	55361	CALL CreateFragments	Create fragments from the monster.
	55364	JP DrawMonsterIcons	Jump to DrawMonsterIcons.