Player Missile Event - Shmupkit

The player Missile is defined in Spite Type 1. It uses a simple 16x16 sprite image, and is launched when the player presses the fire key.

As standard, the missile will only travel half the height of the screen ,but you easily edit this, or use one of the available variables for defining it, which might be a neat way of rewarding the player with a power up.

When it reaches its maximum distance, or reaches the top of the screen, or hits an enemy, it triggers an explosion, by incrementing the frame - since the torpedo explosion is contained in frames 1-4

EVENT SPRITETYPE1
 ;======= PLAYER TORPEDOS ============
 ;============================================
 ;
 ; VARIABLES
 ; =======================================================
 ; DIRECTION - DIRECTION OF TRAVEL, 99 = TRIGGER EXPLOSION
 ; SETTINGA - availabe for use in your game
 ; SETTINGB - DISTANCE TRAVELLED COUNTER
 ; AIRBORNE - availabe for use in your game
 ; JUMPSPEED - availabe for use in your game
 ; ========================================================
 
 
 
 IF DIRECTION 1 ; Torpedo travel up
  LET IMAGE = 1 ; make sure we are on image 1
  REPEAT 6 ; torpedos move quick, so do this 6 times
  SPRITEUP ; move up
  ADD 2 TO SETTINGB ; increase the distance travelled by 2
  IF SETTINGB > = 88 ; when distance travelled = 88
  LET DIRECTION = 99 ; run the explode routine
  ENDIF
  IF Y <= 8 ; has the torpedo reached the top?
  LET DIRECTION = 99 ; yes, so explode it
  EXIT ; exit this event (as we are in a loop)
  ENDIF
  ENDREPEAT
 ENDIF
 
 
  ; EXPLODE THE TORPEDO
  ; ===================
 IF DIRECTION = 99 ; torpedo explosion requested
  ADD 1 TO FRAME ; increment the frame
  IF FRAME = 5 ; when we reach the last frame
  REMOVE ; remove the torpedo
  SUBTRACT 1 FROM S ; decrement the sprite counter
  ENDIF
 ENDIF