mirror of
https://gitlab.com/xCrystal/pokecrystal-board.git
synced 2024-11-16 11:27:33 -08:00
84 lines
1.9 KiB
NASM
84 lines
1.9 KiB
NASM
CheckForHiddenItems:
|
|
; Checks to see if there are hidden items on the screen that have not yet been found. If it finds one, returns carry.
|
|
call GetMapScriptsBank
|
|
ld [wBuffer1], a
|
|
; Get the coordinate of the bottom right corner of the screen, and load it in wBuffer3/wBuffer4.
|
|
ld a, [wXCoord]
|
|
add SCREEN_WIDTH / 4
|
|
ld [wBuffer4], a
|
|
ld a, [wYCoord]
|
|
add SCREEN_HEIGHT / 4
|
|
ld [wBuffer3], a
|
|
; Get the pointer for the first bg_event in the map...
|
|
ld hl, wCurrMapBGEventsPointer
|
|
ld a, [hli]
|
|
ld h, [hl]
|
|
ld l, a
|
|
; ... before even checking to see if there are any BG events on this map.
|
|
ld a, [wCurrMapBGEventCount]
|
|
and a
|
|
jr z, .nobgeventitems
|
|
; For i = 1:wCurrMapBGEventCount...
|
|
.loop
|
|
; Store the counter in wBuffer2, and store the bg_event pointer in the stack.
|
|
ld [wBuffer2], a
|
|
push hl
|
|
; Get the Y coordinate of the BG event.
|
|
call .GetFarByte
|
|
ld e, a
|
|
; Is the Y coordinate of the BG event on the screen? If not, go to the next BG event.
|
|
ld a, [wBuffer3]
|
|
sub e
|
|
jr c, .next
|
|
cp SCREEN_HEIGHT / 2
|
|
jr nc, .next
|
|
; Is the X coordinate of the BG event on the screen? If not, go to the next BG event.
|
|
call .GetFarByte
|
|
ld d, a
|
|
ld a, [wBuffer4]
|
|
sub d
|
|
jr c, .next
|
|
cp SCREEN_WIDTH / 2
|
|
jr nc, .next
|
|
; Is this BG event a hidden item? If not, go to the next BG event.
|
|
call .GetFarByte
|
|
cp BGEVENT_ITEM
|
|
jr nz, .next
|
|
; Has this item already been found? If not, set off the Itemfinder.
|
|
ld a, [wBuffer1]
|
|
call GetFarHalfword
|
|
ld a, [wBuffer1]
|
|
call GetFarHalfword
|
|
ld d, h
|
|
ld e, l
|
|
ld b, CHECK_FLAG
|
|
call EventFlagAction
|
|
ld a, c
|
|
and a
|
|
jr z, .itemnearby
|
|
|
|
.next
|
|
; Restore the bg_event pointer and increment it by the length of a bg_event.
|
|
pop hl
|
|
ld bc, 5
|
|
add hl, bc
|
|
; Restore the BG event counter and decrement it. If it hits zero, there are no hidden items in range.
|
|
ld a, [wBuffer2]
|
|
dec a
|
|
jr nz, .loop
|
|
|
|
.nobgeventitems
|
|
xor a
|
|
ret
|
|
|
|
.itemnearby
|
|
pop hl
|
|
scf
|
|
ret
|
|
|
|
.GetFarByte:
|
|
ld a, [wBuffer1]
|
|
call GetFarByte
|
|
inc hl
|
|
ret
|