ref: af0119ca7e73c21205b5bb89bb9361db9aafa15f
dir: /engine/player_step.asm/
_HandlePlayerStep:: ; d497 (3:5497) ld a, [wPlayerStepFlags] and a ret z bit 7, a ; starting step jr nz, .update_overworld_map bit 6, a ; finishing step jr nz, .update_player_coords bit 5, a ; ongoing step jr nz, .finish ret .update_overworld_map ld a, 4 ld [wHandlePlayerStep], a call UpdateOverworldMap jr .finish .update_player_coords call UpdatePlayerCoords jr .finish .finish call HandlePlayerStep ld a, [wPlayerStepVectorX] ld d, a ld a, [wPlayerStepVectorY] ld e, a ld a, [wPlayerBGMapOffsetX] sub d ld [wPlayerBGMapOffsetX], a ld a, [wPlayerBGMapOffsetY] sub e ld [wPlayerBGMapOffsetY], a ret ScrollScreen:: ; d4d2 (3:54d2) ld a, [wPlayerStepVectorX] ld d, a ld a, [wPlayerStepVectorY] ld e, a ld a, [hSCX] add d ld [hSCX], a ld a, [hSCY] add e ld [hSCY], a ret HandlePlayerStep: ; d4e5 (3:54e5) ld hl, wHandlePlayerStep ld a, [hl] and a ret z dec [hl] ld a, [hl] ld hl, .Jumptable rst JumpTable ret .Jumptable: ; d4f2 (3:54f2) dw GetMovementPermissions dw BufferScreen dw .mobile dw .fail2 ; The rest are never used. Ever. dw .fail1 dw .fail1 dw .fail1 dw .fail1 dw .fail1 dw .fail1 dw .fail1 .fail1 ; d508 (3:5508) ret .mobile ; d509 (3:5509) callba MobileFn_10602e ret .fail2 ; d510 (3:5510) ret UpdatePlayerCoords: ; d511 (3:5511) ld a, [wPlayerStepDirection] and a jr nz, .check_step_down ld hl, YCoord inc [hl] ret .check_step_down cp UP jr nz, .check_step_left ld hl, YCoord dec [hl] ret .check_step_left cp LEFT jr nz, .check_step_right ld hl, XCoord dec [hl] ret .check_step_right cp RIGHT ret nz ld hl, XCoord inc [hl] ret UpdateOverworldMap: ; d536 (3:5536) ld a, [wPlayerStepDirection] and a jr z, .step_down cp UP jr z, .step_up cp LEFT jr z, .step_left cp RIGHT jr z, .step_right ret .step_down call .ScrollOverworldMapDown call LoadMapPart call ScrollMapUp ret .step_up call .ScrollOverworldMapUp call LoadMapPart call ScrollMapDown ret .step_left call .ScrollOverworldMapLeft call LoadMapPart call ScrollMapRight ret .step_right call .ScrollOverworldMapRight call LoadMapPart call ScrollMapLeft ret .ScrollOverworldMapDown: ; d571 (3:5571) ld a, [wBGMapAnchor] add 2 * BG_MAP_WIDTH ld [wBGMapAnchor], a jr nc, .not_overflowed ld a, [wBGMapAnchor + 1] inc a and $3 or VBGMap0 / $100 ld [wBGMapAnchor + 1], a .not_overflowed ld hl, wMetatileStandingY inc [hl] ld a, [hl] cp 2 ; was 1 jr nz, .done_down ld [hl], 0 call .Add6ToOverworldMapAnchor .done_down ret .Add6ToOverworldMapAnchor: ; d595 (3:5595) ld hl, wOverworldMapAnchor ld a, [MapWidth] add 6 add [hl] ld [hli], a ret nc inc [hl] ret .ScrollOverworldMapUp: ; d5a2 (3:55a2) ld a, [wBGMapAnchor] sub 2 * BG_MAP_WIDTH ld [wBGMapAnchor], a jr nc, .not_underflowed ld a, [wBGMapAnchor + 1] dec a and $3 or VBGMap0 / $100 ld [wBGMapAnchor + 1], a .not_underflowed ld hl, wMetatileStandingY dec [hl] ld a, [hl] cp -1 ; was 0 jr nz, .done_up ld [hl], $1 call .Sub6FromOverworldMapAnchor .done_up ret .Sub6FromOverworldMapAnchor: ; d5c6 (3:55c6) ld hl, wOverworldMapAnchor ld a, [MapWidth] add 6 ld b, a ld a, [hl] sub b ld [hli], a ret nc dec [hl] ret .ScrollOverworldMapLeft: ; d5d5 (3:55d5) ld a, [wBGMapAnchor] ld e, a and $e0 ld d, a ld a, e sub $2 and $1f or d ld [wBGMapAnchor], a ld hl, wMetatileStandingX dec [hl] ld a, [hl] cp -1 jr nz, .done_left ld [hl], 1 call .DecrementwOverworldMapAnchor .done_left ret .DecrementwOverworldMapAnchor: ; d5f4 (3:55f4) ld hl, wOverworldMapAnchor ld a, [hl] sub 1 ld [hli], a ret nc dec [hl] ret .ScrollOverworldMapRight: ; d5fe (3:55fe) ld a, [wBGMapAnchor] ld e, a and $e0 ld d, a ld a, e add $2 and $1f or d ld [wBGMapAnchor], a ld hl, wMetatileStandingX inc [hl] ld a, [hl] cp 2 jr nz, .done_right ld [hl], 0 call .IncrementwOverworldMapAnchor .done_right ret .IncrementwOverworldMapAnchor: ; d61d (3:561d) ld hl, wOverworldMapAnchor ld a, [hl] add 1 ld [hli], a ret nc inc [hl] ret