Nightshade: Routine at 55277

55277: Update Shot

The routine for objects of type 80 to 95, 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	55277	LD A,(IX+5)	Set the velocity of the shot from its speed and direction.
	55280	CALL SetVelocityFromSpeed	Set the velocity of the shot from its speed and direction.
	55283	CALL NextSpriteNumber	Change the sprite of the shot.
	55286	CALL TestMove	Check whether the scenery blocks the move along one axis.
	55289	CALL MoveObject	Move the shot.
	55292	CALL TestMove_Keep	Check whether the scenery blocks the move along the other axis.
	55295	CALL MoveObject	Move the shot.
Burst if the shot has hit something.
	55298	BIT 0,(IX+7)	Return if the shot has not hit anything.
	55302	RET Z	Return if the shot has not hit anything.
	55303	LD (IX+0),12	Turn the shot into a burst and return.
	55307	RET	Turn the shot into a burst and return.