diff options
Diffstat (limited to 'engine/items/items.asm')
| -rwxr-xr-x | engine/items/items.asm | 396 |
1 files changed, 264 insertions, 132 deletions
diff --git a/engine/items/items.asm b/engine/items/items.asm index f0666587..1d2001f0 100755 --- a/engine/items/items.asm +++ b/engine/items/items.asm @@ -101,97 +101,143 @@ ItemUsePtrTable: ; d5e1 (3:55e1) dw ItemUsePPRestore ; MAX_ELIXER ItemUseBall: ; d687 (3:5687) + +; Balls can't be used out of battle. ld a,[W_ISINBATTLE] and a - jp z,ItemUseNotTime ; not in battle + jp z,ItemUseNotTime + +; Balls can't catch trainers' Pokémon. dec a jp nz,ThrowBallAtTrainerMon + +; If this is for the old man battle, skip checking if the party & box are full. ld a,[W_BATTLETYPE] dec a - jr z,.UseBall - ld a,[wPartyCount] ;is Party full? + jr z,.canUseBall + + ld a,[wPartyCount] ; is party full? cp a,PARTY_LENGTH - jr nz,.UseBall - ld a,[W_NUMINBOX] ;is Box full? + jr nz,.canUseBall + ld a,[W_NUMINBOX] ; is box full? cp a,MONS_PER_BOX jp z,BoxFullCannotThrowBall -.UseBall -;ok, you can use a ball + +.canUseBall xor a ld [wCapturedMonSpecies],a + ld a,[W_BATTLETYPE] - cp a,2 ;SafariBattle + cp a,BATTLE_TYPE_SAFARI jr nz,.skipSafariZoneCode + .safariZone - ; remove a Safari Ball from inventory ld hl,W_NUMSAFARIBALLS - dec [hl] + dec [hl] ; remove a Safari Ball + .skipSafariZoneCode call RunDefaultPaletteCommand - ld a,$43 - ld [wd11e],a - call LoadScreenTilesFromBuffer1 ;restore screenBuffer from Backup + + ld a,$43 ; successful capture value + ld [wPokeBallAnimData],a + + call LoadScreenTilesFromBuffer1 ld hl,ItemUseText00 call PrintText + +; If the player is fighting an unidentified ghost, set the value that indicates +; the Pokémon can't be caught and skip the capture calculations. callab IsGhostBattle - ld b,$10 - jp z,.next12 + ld b,$10 ; can't be caught value + jp z,.setAnimData + ld a,[W_BATTLETYPE] dec a jr nz,.notOldManBattle + .oldManBattle ld hl,W_GRASSRATE ld de,wPlayerName ld bc,NAME_LENGTH - call CopyData ; save the player's name in the Wild Monster data (part of the Cinnabar Island Missingno glitch) - jp .BallSuccess + call CopyData ; save the player's name in the Wild Monster data (part of the Cinnabar Island Missingno. glitch) + jp .captured + .notOldManBattle +; If the player is fighting the ghost Marowak, set the value that indicates the +; Pokémon can't be caught and skip the capture calculations. ld a,[W_CURMAP] cp a,POKEMONTOWER_6 jr nz,.loop ld a,[wEnemyMonSpecies2] cp a,MAROWAK - ld b,$10 - jp z,.next12 -; if not fighting ghost Marowak, loop until a random number in the current -; pokeball's allowed range is found + ld b,$10 ; can't be caught value + jp z,.setAnimData + +; Get the first random number. Let it be called Rand1. +; Rand1 must be within a certain range according the kind of ball being thrown. +; The ranges are as follows. +; Poké Ball: [0, 255] +; Great Ball: [0, 200] +; Ultra/Safari Ball: [0, 150] +; Loop until an acceptable number is found. + .loop call Random ld b,a + +; Get the item ID. ld hl,wcf91 ld a,[hl] + +; The Master Ball always succeeds. cp a,MASTER_BALL - jp z,.BallSuccess + jp z,.captured + +; Anything will do for the basic Poké Ball. cp a,POKE_BALL jr z,.checkForAilments + +; If it's a Great/Ultra/Safari Ball and Rand1 is greater than 200, try again. ld a,200 cp b - jr c,.loop ;get only numbers <= 200 for Great Ball + jr c,.loop + +; Less than or equal to 200 is good enough for a Great Ball. ld a,[hl] cp a,GREAT_BALL jr z,.checkForAilments - ld a,150 ;get only numbers <= 150 for Ultra Ball + +; If it's an Ultra/Safari Ball and Rand1 is greater than 150, try again. + ld a,150 cp b jr c,.loop + .checkForAilments -; pokemon can be caught more easily with any (primary) status ailment -; Frozen/Asleep pokemon are relatively even easier to catch -; for Frozen/Asleep pokemon, any random number from 0-24 ensures a catch. -; for the others, a random number from 0-11 ensures a catch. - ld a,[wEnemyMonStatus] ;status ailments +; Pokémon can be caught more easily with a status ailment. +; Depending on the status ailment, a certain value will be subtracted from +; Rand1. Let this value be called Status. +; The larger Status is, the more easily the Pokémon can be caught. +; no status ailment: Status = 0 +; Burn/Paralysis/Poison: Status = 12 +; Freeze/Sleep: Status = 25 +; If Status is greater than Rand1, the Pokémon will be caught for sure. + ld a,[wEnemyMonStatus] and a - jr z,.noAilments - and a, 1 << FRZ | SLP ;is frozen and/or asleep? + jr z,.skipAilmentValueSubtraction ; no ailments + and a, 1 << FRZ | SLP ld c,12 jr z,.notFrozenOrAsleep ld c,25 .notFrozenOrAsleep ld a,b sub c - jp c,.BallSuccess + jp c,.captured ld b,a -.noAilments - push bc ;save RANDOM number + +.skipAilmentValueSubtraction + push bc ; save (Rand1 - Status) + +; Calculate MaxHP * 255. xor a ld [H_MULTIPLICAND],a ld hl,wEnemyMonMaxHP @@ -201,121 +247,178 @@ ItemUseBall: ; d687 (3:5687) ld [H_MULTIPLICAND + 2],a ld a,255 ld [H_MULTIPLIER],a - call Multiply ; MaxHP * 255 + call Multiply + +; Determine BallFactor. It's 8 for Great Balls and 12 for the others. ld a,[wcf91] cp a,GREAT_BALL - ld a,12 ;any other BallFactor - jr nz,.next7 + ld a,12 + jr nz,.skip1 ld a,8 -.next7 + +.skip1 +; Note that the results of all division operations are floored. + +; Calculate (MaxHP * 255) / BallFactor. ld [H_DIVISOR],a - ld b,4 ; number of bytes in dividend + ld b,4 ; number of bytes in dividend call Divide + +; Divide the enemy's current HP by 4. HP is not supposed to exceed 999 so +; the result should fit in a. If the division results in a quotient of 0, +; change it to 1. ld hl,wEnemyMonHP ld a,[hli] ld b,a ld a,[hl] - -; explanation: we have a 16-bit value equal to [b << 8 | a]. -; This number is divided by 4. The result is 8 bit (reg. a). -; Always bigger than zero. srl b rr a srl b - rr a ; a = current HP / 4 + rr a and a - jr nz,.next8 + jr nz,.skip2 inc a -.next8 + +.skip2 +; Let W = ((MaxHP * 255) / BallFactor) / max(HP / 4, 1). Calculate W. ld [H_DIVISOR],a ld b,4 - call Divide ; ((MaxHP * 255) / BallFactor) / (CurHP / 4) + call Divide + +; If W > 255, store 255 in [H_QUOTIENT + 3]. +; Let X = min(W, 255) = [H_QUOTIENT + 3]. ld a,[H_QUOTIENT + 2] and a - jr z,.next9 + jr z,.skip3 ld a,255 ld [H_QUOTIENT + 3],a -.next9 - pop bc - ld a,[wEnemyMonCatchRate] ;enemy: Catch Rate + +.skip3 + pop bc ; b = Rand1 - Status + +; If Rand1 - Status > CatchRate, the ball fails to capture the Pokémon. + ld a,[wEnemyMonCatchRate] cp b - jr c,.next10 + jr c,.failedToCapture + +; If W > 255, the ball captures the Pokémon. ld a,[H_QUOTIENT + 2] and a - jr nz,.BallSuccess ; if ((MaxHP * 255) / BallFactor) / (CurHP / 4) > 0x255, automatic success - call Random + jr nz,.captured + + call Random ; Let this random number be called Rand2. + +; If Rand2 > X, the ball fails to capture the Pokémon. ld b,a ld a,[H_QUOTIENT + 3] cp b - jr c,.next10 -.BallSuccess - jr .BallSuccess2 -.next10 + jr c,.failedToCapture + +.captured + jr .skipShakeCalculations + +.failedToCapture ld a,[H_QUOTIENT + 3] - ld [wd11e],a + ld [wPokeBallCaptureCalcTemp],a ; Save X. + +; Calculate CatchRate * 100. xor a ld [H_MULTIPLICAND],a ld [H_MULTIPLICAND + 1],a - ld a,[wEnemyMonCatchRate] ;enemy: Catch Rate + ld a,[wEnemyMonCatchRate] ld [H_MULTIPLICAND + 2],a ld a,100 ld [H_MULTIPLIER],a - call Multiply ; CatchRate * 100 + call Multiply + +; Determine BallFactor2. +; Poké Ball: BallFactor2 = 255 +; Great Ball: BallFactor2 = 200 +; Ultra/Safari Ball: BallFactor2 = 150 ld a,[wcf91] ld b,255 cp a,POKE_BALL - jr z,.next11 + jr z,.skip4 ld b,200 cp a,GREAT_BALL - jr z,.next11 + jr z,.skip4 ld b,150 cp a,ULTRA_BALL - jr z,.next11 -.next11 + jr z,.skip4 + +.skip4 +; Let Y = (CatchRate * 100) / BallFactor2. Calculate Y. ld a,b ld [H_DIVISOR],a ld b,4 call Divide + +; If Y > 255, there are 3 shakes. +; Note that this shouldn't be possible. +; The maximum value of Y is (255 * 100) / 150 = 170. ld a,[H_QUOTIENT + 2] and a - ld b,$63 - jr nz,.next12 - ld a,[wd11e] + ld b,$63 ; 3 shakes + jr nz,.setAnimData + +; Calculate X * Y. + ld a,[wPokeBallCaptureCalcTemp] ld [H_MULTIPLIER],a call Multiply + +; Calculate (X * Y) / 255. ld a,255 ld [H_DIVISOR],a ld b,4 call Divide - ld a,[wEnemyMonStatus] ;status ailments + +; Determine Status2. +; no status ailment: Status2 = 0 +; Burn/Paralysis/Poison: Status2 = 5 +; Freeze/Sleep: Status2 = 10 + ld a,[wEnemyMonStatus] and a - jr z,.next13 + jr z,.skip5 and a, 1 << FRZ | SLP ld b,5 - jr z,.next14 + jr z,.addAilmentValue ld b,10 -.next14 + +.addAilmentValue +; If the Pokémon has a status ailment, add Status2. ld a,[H_QUOTIENT + 3] add b ld [H_QUOTIENT + 3],a -.next13 + +.skip5 +; Finally determine the number of shakes. +; Let Z = ((X * Y) / 255) + Status2 = [H_QUOTIENT + 3]. +; The number of shakes depend on the range Z is in. +; 0 ≤ Z < 10: 0 shakes (the ball misses) +; 10 ≤ Z < 30: 1 shake +; 30 ≤ Z < 70: 2 shakes +; 70 ≤ Z: 3 shakes ld a,[H_QUOTIENT + 3] cp a,10 ld b,$20 - jr c,.next12 + jr c,.setAnimData cp a,30 ld b,$61 - jr c,.next12 + jr c,.setAnimData cp a,70 ld b,$62 - jr c,.next12 + jr c,.setAnimData ld b,$63 -.next12 + +.setAnimData ld a,b ld [wPokeBallAnimData],a -.BallSuccess2 + +.skipShakeCalculations ld c,20 call DelayFrames + +; Do the animation. ld a,TOSS_ANIM ld [W_ANIMATIONID],a xor a @@ -331,45 +434,61 @@ ItemUseBall: ; d687 (3:5687) ld [wcf91],a pop af ld [wWhichPokemon],a + +; Determine the message to display from the animation. ld a,[wPokeBallAnimData] cp a,$10 ld hl,ItemUseBallText00 - jp z,.printText0 + jp z,.printMessage cp a,$20 ld hl,ItemUseBallText01 - jp z,.printText0 + jp z,.printMessage cp a,$61 ld hl,ItemUseBallText02 - jp z,.printText0 + jp z,.printMessage cp a,$62 ld hl,ItemUseBallText03 - jp z,.printText0 + jp z,.printMessage cp a,$63 ld hl,ItemUseBallText04 - jp z,.printText0 - ld hl,wEnemyMonHP ;current HP + jp z,.printMessage + +; Save current HP. + ld hl,wEnemyMonHP ld a,[hli] push af ld a,[hli] - push af ;backup currentHP... + push af + +; Save status ailment. inc hl ld a,[hl] - push af ;...and status ailments + push af + push hl + +; If the Pokémon is transformed, the Pokémon is assumed to be a Ditto. +; This is a bug because a wild Pokémon could have used Transform via +; Mirror Move even though the only wild Pokémon that knows Transform is Ditto. ld hl,W_ENEMYBATTSTATUS3 bit Transformed,[hl] - jr z,.next15 - ld a,$4c + jr z,.notTransformed + ld a,DITTO ld [wEnemyMonSpecies2],a - jr .next16 -.next15 + jr .skip6 + +.notTransformed +; If the Pokémon is not transformed, set the transformed bit and copy the +; DVs to wTransformedEnemyMonOriginalDVs so that LoadEnemyMonData won't generate +; new DVs. set Transformed,[hl] ld hl,wTransformedEnemyMonOriginalDVs ld a,[wEnemyMonDVs] ld [hli],a ld a,[wEnemyMonDVs + 1] ld [hl],a -.next16 + +.skip6 ld a,[wcf91] push af ld a,[wEnemyMonSpecies2] @@ -387,15 +506,18 @@ ItemUseBall: ; d687 (3:5687) ld [hld],a pop af ld [hl],a - ld a,[wEnemyMonSpecies] ;enemy + ld a,[wEnemyMonSpecies] ld [wCapturedMonSpecies],a ld [wcf91],a ld [wd11e],a ld a,[W_BATTLETYPE] - dec a - jr z,.printText1 + dec a ; is this the old man battle? + jr z,.oldManCaughtMon ; if so, don't give the player the caught Pokémon + ld hl,ItemUseBallText05 call PrintText + +; Add the caught Pokémon to the Pokédex. predef IndexToPokedex ld a,[wd11e] dec a @@ -411,46 +533,56 @@ ItemUseBall: ; d687 (3:5687) ld b,FLAG_SET predef FlagActionPredef pop af - and a - jr nz,.checkParty + + and a ; was the Pokémon already in the Pokédex? + jr nz,.skipShowingPokedexData ; if so, don't show the Pokédex data + ld hl,ItemUseBallText06 call PrintText call ClearSprites - ld a,[wEnemyMonSpecies] ;caught mon_ID + ld a,[wEnemyMonSpecies] ld [wd11e],a predef ShowPokedexData -.checkParty + +.skipShowingPokedexData ld a,[wPartyCount] - cp a,PARTY_LENGTH ;is party full? + cp a,PARTY_LENGTH ; is party full? jr z,.sendToBox xor a ; PLAYER_PARTY_DATA ld [wMonDataLocation],a call ClearSprites - call AddPartyMon ;add mon to Party - jr .End + call AddPartyMon + jr .done + .sendToBox call ClearSprites call SendNewMonToBox ld hl,ItemUseBallText07 CheckEvent EVENT_MET_BILL - jr nz,.sendToBox2 + jr nz,.printTransferredToPCText ld hl,ItemUseBallText08 -.sendToBox2 +.printTransferredToPCText call PrintText - jr .End -.printText1 + jr .done + +.oldManCaughtMon ld hl,ItemUseBallText05 -.printText0 + +.printMessage call PrintText call ClearSprites -.End + +.done ld a,[W_BATTLETYPE] - and a - ret nz + and a ; is this the old man battle? + ret nz ; if so, don't remove a ball from the bag + +; Remove a ball from the bag. ld hl,wNumBagItems inc a ld [wItemQuantity],a jp RemoveItemFromInventory + ItemUseBallText00: ; d937 (3:5937) ;"It dodged the thrown ball!" ;"This pokemon can't be caught" @@ -769,10 +901,10 @@ ItemUseMedicine: ; dabb (3:5abb) ld hl,W_PLAYERBATTSTATUS3 res BadlyPoisoned,[hl] ; heal Toxic status pop hl - ld bc,30 + ld bc,wPartyMon1Stats - wPartyMon1Status add hl,bc ; hl now points to party stats - ld de,wBattleMonMaxHP - ld bc,10 + ld de,wBattleMonStats + ld bc,NUM_STATS * 2 call CopyData ; copy party stats to in-battle stat data predef DoubleOrHalveSelectedStats jp .doneHealing @@ -827,7 +959,7 @@ ItemUseMedicine: ; dabb (3:5abb) .compareCurrentHPToMaxHP push hl push bc - ld bc,32 + ld bc,wPartyMon1MaxHP - (wPartyMon1HP + 1) add hl,bc ; hl now points to max HP pop bc ld a,[hli] @@ -859,7 +991,7 @@ ItemUseMedicine: ; dabb (3:5abb) ld [wChannelSoundIDs + CH4],a push hl push de - ld bc,32 + ld bc,wPartyMon1MaxHP - (wPartyMon1HP + 1) add hl,bc ; hl now points to max HP ld a,[hli] ld [wHPBarMaxHP+1],a @@ -892,7 +1024,7 @@ ItemUseMedicine: ; dabb (3:5abb) ld [H_DIVISOR],a ld b,2 ; number of bytes call Divide ; get 1/5 of max HP of pokemon that used Softboiled - ld bc,wPartyMon1HP - wPartyMon1MaxHP + ld bc,(wPartyMon1HP + 1) - (wPartyMon1MaxHP + 1) add hl,bc ; hl now points to LSB of current HP of pokemon that used Softboiled ; subtract 1/5 of max HP from current HP of pokemon that used Softboiled ld a,[H_QUOTIENT + 3] @@ -971,7 +1103,7 @@ ItemUseMedicine: ; dabb (3:5abb) inc hl ld d,h ld e,l ; de now points to current HP - ld hl,33 + ld hl,(wPartyMon1MaxHP + 1) - (wPartyMon1HP + 1) add hl,de ; hl now points to max HP ld a,[wcf91] cp a,REVIVE @@ -1018,7 +1150,7 @@ ItemUseMedicine: ; dabb (3:5abb) ld a,[wcf91] cp a,FULL_RESTORE jr nz,.updateInBattleData - ld bc,-31 + ld bc,wPartyMon1Status - (wPartyMon1MaxHP + 1) add hl,bc xor a ld [hl],a ; remove the status ailment in the party data @@ -1041,7 +1173,7 @@ ItemUseMedicine: ; dabb (3:5abb) ld [wBattleMonStatus],a ; remove the status ailment in the in-battle pokemon data .calculateHPBarCoords ld hl,wOAMBuffer + $90 - ld bc,2 * 20 + ld bc,2 * SCREEN_WIDTH inc d .calculateHPBarCoordsLoop add hl,bc @@ -1121,7 +1253,7 @@ ItemUseMedicine: ; dabb (3:5abb) ld a,[hl] ld [wd0b5],a ld [wd11e],a - ld bc,33 + ld bc,wPartyMon1Level - wPartyMon1 add hl,bc ; hl now points to level ld a,[hl] ; a = level ld [W_CURENEMYLVL],a ; store level @@ -1138,7 +1270,7 @@ ItemUseMedicine: ; dabb (3:5abb) push hl sub a,HP_UP add a - ld bc,17 + ld bc,wPartyMon1HPExp - wPartyMon1 add hl,bc add l ld l,a @@ -1186,17 +1318,17 @@ ItemUseMedicine: ; dabb (3:5abb) call PrintText jp GBPalWhiteOut .recalculateStats - ld bc,34 + ld bc,wPartyMon1Stats - wPartyMon1 add hl,bc ld d,h ld e,l ; de now points to stats - ld bc,-18 - add hl,bc ; hl now points to byte 3 of experience + ld bc,(wPartyMon1Exp + 2) - wPartyMon1Stats + add hl,bc ; hl now points to LSB of experience ld b,1 jp CalcStats ; recalculate stats .useRareCandy push hl - ld bc,33 + ld bc,wPartyMon1Level - wPartyMon1 add hl,bc ; hl now points to level ld a,[hl] ; a = level cp a, MAX_LEVEL @@ -1210,8 +1342,8 @@ ItemUseMedicine: ; dabb (3:5abb) callab CalcExperience ; calculate experience for next level and store it at $ff96 pop de pop hl - ld bc,-19 - add hl,bc ; hl now points to experience + ld bc,wPartyMon1Exp - wPartyMon1Level + add hl,bc ; hl now points to MSB of experience ; update experience to minimum for new level ld a,[hExperience] ld [hli],a @@ -1226,7 +1358,7 @@ ItemUseMedicine: ; dabb (3:5abb) push af push de push hl - ld bc,34 + ld bc,wPartyMon1MaxHP - wPartyMon1 add hl,bc ; hl now points to MSB of max HP ld a,[hli] ld b,a @@ -1236,8 +1368,8 @@ ItemUseMedicine: ; dabb (3:5abb) push hl call .recalculateStats pop hl - ld bc,35 ; hl now points to LSB of max HP - add hl,bc + ld bc,(wPartyMon1MaxHP + 1) - wPartyMon1 + add hl,bc ; hl now points to LSB of max HP pop bc ld a,[hld] sub c @@ -1246,8 +1378,8 @@ ItemUseMedicine: ; dabb (3:5abb) sbc b ld b,a ; bc = the amount of max HP gained from leveling up ; add the amount gained to the current HP - ld de,-32 - add hl,de ; hl now points to MSB of current HP + ld de,(wPartyMon1HP + 1) - wPartyMon1MaxHP + add hl,de ; hl now points to LSB of current HP ld a,[hl] add c ld [hld],a @@ -1421,7 +1553,7 @@ ItemUseCardKey: ; e022 (3:6022) xor a ld [wUnusedD71F],a call GetTileAndCoordsInFrontOfPlayer - ld a,[GetTileAndCoordsInFrontOfPlayer] ; $4586 + ld a,[GetTileAndCoordsInFrontOfPlayer] cp a,$18 jr nz,.next0 ld hl,CardKeyTable1 |