pokecrystal-board/data/maps/attributes.asm

MACRO map_attributes
;\1: map name
;\2: map id
;\3: border block
;\4: connections: combo of NORTH, SOUTH, WEST, and/or EAST, or 0 for none
	DEF CURRENT_MAP_WIDTH = \2_WIDTH
	DEF CURRENT_MAP_HEIGHT = \2_HEIGHT
\1_MapAttributes::
	db \3
	db CURRENT_MAP_HEIGHT, CURRENT_MAP_WIDTH
	db BANK(\1_Blocks)
	dw \1_Blocks
	db BANK(\1_MapScripts) ; aka BANK(\1_MapEvents)
	dw \1_MapScripts
	dw \1_MapEvents
	db \4
ENDM

; Connections go in order: north, south, west, east
MACRO connection
;\1: direction
;\2: map name
;\3: map id
;\4: offset of the target map relative to the current map
;    (x offset for east/west, y offset for north/south)

	; LEGACY: Support for old connection macro
	if _NARG == 6
		connection \1, \2, \3, (\4) - (\5)
	else

		; Calculate tile offsets for source (current) and target maps
		DEF _src = 0
		DEF _tgt = (\4) + 3
		if _tgt < 0
			DEF _src = -_tgt
			DEF _tgt = 0
		endc

		if !STRCMP("\1", "north")
			DEF _blk = \3_WIDTH * (\3_HEIGHT - 3) + _src
			DEF _map = _tgt
			DEF _win = (\3_WIDTH + 6) * \3_HEIGHT + 1
			DEF _y = \3_HEIGHT * 2 - 1
			DEF _x = (\4) * -2
			DEF _len = CURRENT_MAP_WIDTH + 3 - (\4)
			if _len > \3_WIDTH
				DEF _len = \3_WIDTH
			endc

		elif !STRCMP("\1", "south")
			DEF _blk = _src
			DEF _map = (CURRENT_MAP_WIDTH + 6) * (CURRENT_MAP_HEIGHT + 3) + _tgt
			DEF _win = \3_WIDTH + 7
			DEF _y = 0
			DEF _x = (\4) * -2
			DEF _len = CURRENT_MAP_WIDTH + 3 - (\4)
			if _len > \3_WIDTH
				DEF _len = \3_WIDTH
			endc

		elif !STRCMP("\1", "west")
			DEF _blk = (\3_WIDTH * _src) + \3_WIDTH - 3
			DEF _map = (CURRENT_MAP_WIDTH + 6) * _tgt
			DEF _win = (\3_WIDTH + 6) * 2 - 6
			DEF _y = (\4) * -2
			DEF _x = \3_WIDTH * 2 - 1
			DEF _len = CURRENT_MAP_HEIGHT + 3 - (\4)
			if _len > \3_HEIGHT
				DEF _len = \3_HEIGHT
			endc

		elif !STRCMP("\1", "east")
			DEF _blk = (\3_WIDTH * _src)
			DEF _map = (CURRENT_MAP_WIDTH + 6) * _tgt + CURRENT_MAP_WIDTH + 3
			DEF _win = \3_WIDTH + 7
			DEF _y = (\4) * -2
			DEF _x = 0
			DEF _len = CURRENT_MAP_HEIGHT + 3 - (\4)
			if _len > \3_HEIGHT
				DEF _len = \3_HEIGHT
			endc

		else
			fail "Invalid direction for 'connection'."
		endc

	map_id \3
	dw \2_Blocks + _blk
	dw wOverworldMapBlocks + _map
	db _len - _src
	db \3_WIDTH
	db _y, _x
	dw wOverworldMapBlocks + _win

	endc
ENDM

	map_attributes Level1_Map1, LEVEL_1_MAP_1, $00, SOUTH | NORTH
	connection south, Level1_Map1, LEVEL_1_MAP_1, 0
	connection north, Level1_Map1, LEVEL_1_MAP_1, 0

	; map_attributes NewBarkTown, NEW_BARK_TOWN, $05, WEST | EAST
	; connection west, Route29, ROUTE_29, 0
	; connection east, Route27, ROUTE_27, 0