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⌂ ∞ Elite on the BBC Micro and NES

Icon bar: HideIconBarPointer

[NES version, Bank 7]

       Name: HideIconBarPointer                                      [Show more]
       Type: Subroutine
   Category: Icon bar
    Summary: Clear the icon bar choice and hide the icon bar pointer

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * MoveIconBarPointer calls HideIconBarPointer
             * MoveIconBarPointer calls via hipo2




 Other entry points:

   hipo2                Clear the icon button choice and hide the icon bar
                        pointer



.HideIconBarPointer

 LDA controller1Start   ; If the Start button on controller 1 was being held
 AND #%11000000         ; down (bit 6 is set) but is no longer being held down
 CMP #%01000000         ; (bit 7 is clear) then keep going, otherwise jump to
 BNE hipo1              ; hipo1

 LDA #80                ; The Start button has been pressed and released, so
 STA iconBarChoice      ; set iconBarChoice to 80 to record this

 BNE hipo3              ; Jump to hipo3 to hide the icon bar pointer and return
                        ; from the subroutine

.hipo1

 LDA iconBarChoice      ; If iconBarChoice = 80 then we have already recorded
 CMP #80                ; that the Start button has been pressed but this has
 BEQ hipo3              ; not yet been processed (as otherwise it would have
                        ; been zeroed), so jump to hipo3 to hide the icon bar
                        ; pointer and return from the subroutine

.hipo2

 LDA #0                 ; Set iconBarChoice = 0 to clear the icon button choice
 STA iconBarChoice      ; so we don't process it again

.hipo3

 LDA #240               ; Set A to the y-coordinate that's just below the bottom
                        ; of the screen, so we can hide the icon bar pointer
                        ; sprites by moving them off-screen

 STA ySprite1           ; Set the y-coordinates for the four icon bar pointer
 STA ySprite2           ; sprites to 240, to move them off-screen
 STA ySprite3
 STA ySprite4

 RTS                    ; Return from the subroutine