Nightshade: Routine at D7ED

D7ED: Update Shot

The routine for objects of type 50 to 5F, the shots that the player fires. A shot moves in a straight line, and turns into a burst when it hits something.
Move the shot along both axes.
UpdateShot	D7ED	LD A,(IX+$05)	Set the velocity of the shot from its speed and direction.
	D7F0	CALL SetVelocityFromSpeed	Set the velocity of the shot from its speed and direction.
	D7F3	CALL NextSpriteNumber	Change the sprite of the shot.
	D7F6	CALL TestMove	Check whether the scenery blocks the move along one axis.
	D7F9	CALL MoveObject	Move the shot.
	D7FC	CALL TestMove_Keep	Check whether the scenery blocks the move along the other axis.
	D7FF	CALL MoveObject	Move the shot.
Burst if the shot has hit something.
	D802	BIT 0,(IX+$07)	Return if the shot has not hit anything.
	D806	RET Z	Return if the shot has not hit anything.
	D807	LD (IX+$00),$0C	Turn the shot into a burst and return.
	D80B	RET	Turn the shot into a burst and return.