Nightshade: Routine at 52873

52873: Update Spore

The routine for objects of type 64 to 79, the spores. A spore wanders about at random, and vanishes when the player is more than three cells away. If a shot hits it, both the spore and the shot burst. If the player touches it, the spore bursts and the player is hurt. Either way, 5 hundred points are added to the score.
Wander, then flip the sprite if the view is turned.
UpdateSpore	52873	LD B,7	Use 7 as the number of random bits for the velocity.
	52875	CALL ChooseRandomVelocity	Choose a new random velocity when the timer has run out.
	52878	CALL SetDirectionFromVelocity	Make the spore face the way that it is moving.
	52881	CALL MoveObject	Move the spore.
	52884	CALL NextSpriteNumber	Animate the spore.
	52887	LD A,(48058)	Check whether the view is turned round, to flip the sprite to match.
	52890	RRCA
	52891	RRCA
	52892	AND 64
	52894	LD C,A
	52895	LD A,(IX+7)	Set or clear the flip flag of the spore.
	52898	AND 191
	52900	OR C
	52901	LD (IX+7),A
Vanish, burst, or hurt the player.
	52904	LD C,3	Set the distance to 3 cells and check whether the spore is that close to the player.
	52906	CALL CheckPlayerClose
	52909	JR NC,BurstSporeAndShot_Remove	Jump to BurstSporeAndShot_Remove to remove the spore if it is further away.
	52911	CALL CheckShotHit	Check whether a shot has hit the spore, and jump to BurstSporeAndShot if it has.
	52914	JR C,BurstSporeAndShot
	52916	CALL CheckPlayerCollision	Check whether the spore is touching the player, and return if it is not.
	52919	RET NC
	52920	CALL BurstSporeAndShot_Score	Add the points for the spore to the score.