Avoid magic numbers for most `CopyData` calls (#542)

7 files changed, 34 insertions, 32 deletions

diff --git a/engine/battle/animations.asm b/engine/battle/animations.asm
index 711ebda4..f66be640 100644
--- a/engine/battle/animations.asm
+++ b/engine/battle/animations.asm
@@ -1213,12 +1213,12 @@ _AnimationSlideMonUp:
 	push bc
 
 ; In each iteration, slide up all rows but the top one (which is overwritten).
-	ld b, 6
+	ld b, PIC_HEIGHT - 1
 .slideLoop
 	push bc
 	push de
 	push hl
-	ld bc, 7
+	ld bc, PIC_WIDTH
 	call CopyData
 ; Note that de and hl are popped in the same order they are pushed, swapping
 ; their values. When CopyData is called, hl points to a tile 1 row below
@@ -1242,10 +1242,10 @@ _AnimationSlideMonUp:
 	ld a, [wSlideMonUpBottomRowLeftTile]
 	inc a
 	ld [wSlideMonUpBottomRowLeftTile], a
-	ld c, 7
+	ld c, PIC_WIDTH
 .fillBottomRowLoop
 	ld [hli], a
-	add 7
+	add PIC_WIDTH
 	dec c
 	jr nz, .fillBottomRowLoop
 
@@ -1723,10 +1723,10 @@ AnimationMinimizeMon:
 	ld hl, wTempPic
 	push hl
 	xor a
-	ld bc, (7 * 7) tiles
+	ld bc, PIC_SIZE tiles
 	call FillMemory
 	pop hl
-	ld de, (7 * 3 + 4) tiles + TILE_SIZE / 4
+	ld de, (PIC_WIDTH * 3 + 4) tiles + TILE_SIZE / 4
 	add hl, de
 	ld de, MinimizedMonSprite
 	ld c, MinimizedMonSpriteEnd - MinimizedMonSprite
@@ -1774,7 +1774,7 @@ AnimationSlideMonDownAndHide:
 	jr nz, .loop
 	call AnimationHideMonPic
 	ld hl, wTempPic
-	ld bc, 7 * 7 tiles
+	ld bc, PIC_SIZE tiles
 	xor a
 	call FillMemory
 	jp CopyTempPicToMonPic
@@ -1867,7 +1867,7 @@ CopyTempPicToMonPic:
 	ld hl, vFrontPic ; enemy turn
 .next
 	ld de, wTempPic
-	ld bc, 7 * 7
+	ld bc, PIC_SIZE
 	jp CopyVideoData
 
 AnimationWavyScreen:
@@ -1935,7 +1935,7 @@ AnimationSubstitute:
 ; Changes the pokemon's sprite to the mini sprite
 	ld hl, wTempPic
 	xor a
-	ld bc, 7 * 7 tiles
+	ld bc, PIC_SIZE tiles
 	call FillMemory
 	ldh a, [hWhoseTurn]
 	and a
@@ -2473,7 +2473,7 @@ AnimationShakeEnemyHUD:
 ; Make a copy of the back pic's tile patterns in sprite tile pattern VRAM.
 	ld de, vBackPic
 	ld hl, vSprites
-	ld bc, 7 * 7
+	ld bc, PIC_SIZE
 	call CopyVideoData
 
 	xor a
diff --git a/engine/battle/core.asm b/engine/battle/core.asm
index 672bd416..4c25373a 100644
--- a/engine/battle/core.asm
+++ b/engine/battle/core.asm
@@ -1183,17 +1183,17 @@ SlideDownFaintedMonPic:
 	push af
 	set BIT_NO_TEXT_DELAY, a
 	ld [wStatusFlags5], a
-	ld b, 7 ; number of times to slide
+	ld b, PIC_HEIGHT ; number of times to slide
 .slideStepLoop ; each iteration, the mon is slid down one row
 	push bc
 	push de
 	push hl
-	ld b, 6 ; number of rows
+	ld b, PIC_HEIGHT - 1 ; number of rows
 .rowLoop
 	push bc
 	push hl
 	push de
-	ld bc, $7
+	ld bc, PIC_WIDTH
 	call CopyData
 	pop de
 	pop hl
@@ -1225,7 +1225,8 @@ SlideDownFaintedMonPic:
 	ret
 
 SevenSpacesText:
-	db "       @"
+	ds PIC_WIDTH, ' '
+	db "@"
 
 ; slides the player or enemy trainer off screen
 ; a is the number of tiles to slide it horizontally (always 9 for the player trainer or 8 for the enemy trainer)
@@ -1237,7 +1238,7 @@ SlideTrainerPicOffScreen:
 .slideStepLoop ; each iteration, the trainer pic is slid one tile left/right
 	push bc
 	push hl
-	ld b, 7 ; number of rows
+	ld b, PIC_HEIGHT ; number of rows
 .rowLoop
 	push hl
 	ldh a, [hSlideAmount]
@@ -1794,7 +1795,7 @@ AnimateRetreatingPlayerMon:
 	lb bc, 7, 7
 	jp ClearScreenArea
 
-; Copies player's current pokemon's current HP and status into the party
+; Copies player's current pokemon's current HP, party pos, and status into the party
 ; struct data so it stays after battle or switching
 ReadPlayerMonCurHPAndStatus:
 	ld a, [wPlayerMonNumber]
@@ -1804,7 +1805,7 @@ ReadPlayerMonCurHPAndStatus:
 	ld d, h
 	ld e, l
 	ld hl, wBattleMonHP
-	ld bc, $4               ; 2 bytes HP, 1 byte unknown (unused?), 1 byte status
+	ld bc, MON_STATUS + 1 - MON_HP ; also copies party pos in-between HP and status
 	jp CopyData
 
 DrawHUDsAndHPBars:
@@ -6352,7 +6353,7 @@ LoadPlayerBackPic:
 	ld [hl], d ; OAM Y
 	inc hl
 	ld [hl], e ; OAM X
-	ld a, $8 ; height of tile
+	ld a, TILE_HEIGHT
 	add d ; increase Y by height of tile
 	ld d, a
 	inc hl
@@ -6366,7 +6367,7 @@ LoadPlayerBackPic:
 	ldh a, [hOAMTile]
 	add $4 ; increase tile number by 4
 	ldh [hOAMTile], a
-	ld a, $8 ; width of tile
+	ld a, TILE_WIDTH
 	add e ; increase X by width of tile
 	ld e, a
 	dec b
@@ -6381,7 +6382,7 @@ LoadPlayerBackPic:
 	ld de, sSpriteBuffer1
 	ldh a, [hLoadedROMBank]
 	ld b, a
-	ld c, 7 * 7
+	ld c, PIC_SIZE
 	call CopyVideoData
 	xor a
 	ld [rRAMG], a
diff --git a/engine/battle/draw_hud_pokeball_gfx.asm b/engine/battle/draw_hud_pokeball_gfx.asm
index 983e7cdf..011b4b33 100644
--- a/engine/battle/draw_hud_pokeball_gfx.asm
+++ b/engine/battle/draw_hud_pokeball_gfx.asm
@@ -119,7 +119,7 @@ WritePokeballOAMData:
 PlacePlayerHUDTiles:
 	ld hl, PlayerBattleHUDGraphicsTiles
 	ld de, wHUDGraphicsTiles
-	ld bc, $3
+	ld bc, wHUDGraphicsTilesEnd - wHUDGraphicsTiles
 	call CopyData
 	hlcoord 18, 10
 	ld de, -1
@@ -134,7 +134,7 @@ PlayerBattleHUDGraphicsTiles:
 PlaceEnemyHUDTiles:
 	ld hl, EnemyBattleHUDGraphicsTiles
 	ld de, wHUDGraphicsTiles
-	ld bc, $3
+	ld bc, wHUDGraphicsTilesEnd - wHUDGraphicsTiles
 	call CopyData
 	hlcoord 1, 2
 	ld de, $1
@@ -150,7 +150,7 @@ PlaceHUDTiles:
 	ld [hl], $73
 	ld bc, SCREEN_WIDTH
 	add hl, bc
-	ld a, [wHUDGraphicsTiles + 1] ; leftmost tile
+	ld a, [wHUDCornerTile] ; leftmost tile
 	ld [hl], a
 	ld a, 8
 .loop
@@ -159,7 +159,7 @@ PlaceHUDTiles:
 	dec a
 	jr nz, .loop
 	add hl, de
-	ld a, [wHUDGraphicsTiles + 2] ; rightmost tile
+	ld a, [wHUDTriangleTile] ; rightmost tile
 	ld [hl], a
 	ret
 
diff --git a/engine/battle/effects.asm b/engine/battle/effects.asm
index e107853c..003592aa 100644
--- a/engine/battle/effects.asm
+++ b/engine/battle/effects.asm
@@ -754,7 +754,7 @@ PrintStatText:
 	jr .findStatName_inner
 .foundStatName
 	ld de, wStringBuffer
-	ld bc, $a
+	ld bc, NAME_LENGTH - 1 ; all StatModTextStrings are at most 10 bytes
 	jp CopyData
 
 INCLUDE "data/battle/stat_mod_names.asm"
diff --git a/engine/battle/ghost_marowak_anim.asm b/engine/battle/ghost_marowak_anim.asm
index 4b1eb452..1040f85f 100644
--- a/engine/battle/ghost_marowak_anim.asm
+++ b/engine/battle/ghost_marowak_anim.asm
@@ -52,7 +52,7 @@ MarowakAnim:
 CopyMonPicFromBGToSpriteVRAM:
 	ld de, vFrontPic
 	ld hl, vSprites
-	ld bc, 7 * 7
+	ld bc, PIC_SIZE
 	call CopyVideoData
 	ld a, $10
 	ld [wBaseCoordY], a
diff --git a/engine/battle/move_effects/transform.asm b/engine/battle/move_effects/transform.asm
index 6f2e705c..343fa3ca 100644
--- a/engine/battle/move_effects/transform.asm
+++ b/engine/battle/move_effects/transform.asm
@@ -82,14 +82,15 @@ TransformEffect_:
 	ld a, [hli]
 	ld [de], a
 	inc de
-; Attack, Defense, Speed, and Special stats
+; Skip level and max HP
 	inc hl
 	inc hl
 	inc hl
 	inc de
 	inc de
 	inc de
-	ld bc, $8
+; Attack, Defense, Speed, and Special stats
+	ld bc, (NUM_STATS - 1) * 2
 	call CopyData
 	ld bc, wBattleMonMoves - wBattleMonPP
 	add hl, bc ; ld hl, wBattleMonMoves
@@ -99,7 +100,7 @@ TransformEffect_:
 	ld a, [hli]
 	and a
 	jr z, .lessThanFourMoves
-	ld a, $5
+	ld a, 5
 	ld [de], a
 	inc de
 	dec b
@@ -136,7 +137,7 @@ TransformEffect_:
 	ld l, e
 	pop de
 .gotStatsOrModsToCopy
-	ld bc, $8
+	ld bc, (NUM_STATS - 1) * 2
 	jp CopyData
 
 .failed
diff --git a/engine/battle/trainer_ai.asm b/engine/battle/trainer_ai.asm
index 4134047f..546dd60e 100644
--- a/engine/battle/trainer_ai.asm
+++ b/engine/battle/trainer_ai.asm
@@ -583,7 +583,7 @@ AISwitchIfEnoughMons:
 
 SwitchEnemyMon:
 
-; prepare to withdraw the active monster: copy hp, number, and status to roster
+; prepare to withdraw the active monster: copy HP, party pos, and status to roster
 
 	ld a, [wEnemyMonPartyPos]
 	ld hl, wEnemyMon1HP
@@ -592,7 +592,7 @@ SwitchEnemyMon:
 	ld d, h
 	ld e, l
 	ld hl, wEnemyMonHP
-	ld bc, 4
+	ld bc, MON_STATUS + 1 - MON_HP ; also copies party pos in-between HP and status
 	call CopyData
 
 	ld hl, AIBattleWithdrawText