Improve wTrainerHUDTiles usage

engine/battle/trainer_huds.asm

@@ -101,7 +101,7 @@ StageBallTilesData:
 DrawPlayerHUDBorder:
 	ld hl, .tiles
 	ld de, wTrainerHUDTiles
-	ld bc, 4
+	ld bc, .tiles_end - .tiles
 	call CopyBytes
 	hlcoord 18, 10
 	ld de, -1 ; start on right
@@ -112,11 +112,12 @@ DrawPlayerHUDBorder:
 	db $77 ; bottom right
 	db $6f ; bottom left
 	db $76 ; bottom side
+.tiles_end
 
 DrawPlayerPartyIconHUDBorder:
 	ld hl, .tiles
 	ld de, wTrainerHUDTiles
-	ld bc, 4
+	ld bc, .tiles_end - .tiles
 	call CopyBytes
 	hlcoord 18, 10
 	ld de, -1 ; start on right
@@ -127,11 +128,12 @@ DrawPlayerPartyIconHUDBorder:
 	db $5c ; bottom right
 	db $6f ; bottom left
 	db $76 ; bottom side
+.tiles_end
 
 DrawEnemyHUDBorder:
 	ld hl, .tiles
 	ld de, wTrainerHUDTiles
-	ld bc, 4
+	ld bc, .tiles_end - .tiles
 	call CopyBytes
 	hlcoord 1, 2
 	ld de, 1 ; start on left
@@ -152,23 +154,24 @@ DrawEnemyHUDBorder:
 	db $74 ; bottom left
 	db $78 ; bottom right
 	db $76 ; bottom side
+.tiles_end
 
 PlaceHUDBorderTiles:
-	ld a, [wTrainerHUDTiles]
+	ld a, [wTrainerHUDTiles+0]
 	ld [hl], a
 	ld bc, SCREEN_WIDTH
 	add hl, bc
-	ld a, [wStartFlypoint]
+	ld a, [wTrainerHUDTiles+1]
 	ld [hl], a
-	ld b, $8
+	ld b, 8
 .loop
 	add hl, de
-	ld a, [wMovementBuffer]
+	ld a, [wTrainerHUDTiles+3]
 	ld [hl], a
 	dec b
 	jr nz, .loop
 	add hl, de
-	ld a, [wEndFlypoint]
+	ld a, [wTrainerHUDTiles+2]
 	ld [hl], a
 	ret
 
@@ -181,7 +184,7 @@ LinkBattle_TrainerHuds:
 	ld a, 10 * 8
 	ld [hli], a
 	ld [hl], 8 * 8
-	ld a, $8
+	ld a, 8
 	ld [wPlaceBallsDirection], a
 	ld hl, wVirtualOAMSprite00
 	call LoadTrainerHudOAM

wram.asm

@@ -1701,7 +1701,7 @@ NEXTU ; d002
 ; trainer HUD data
 	ds 1
 wPlaceBallsDirection:: db
-wTrainerHUDTiles:: db
+wTrainerHUDTiles:: ds 4
 
 NEXTU ; d002
 ; mobile participant nicknames