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pokeemerald/src/faraway_island.c
Marcus Huderle d13563b174 Document some faraway_island code
2019-03-31 14:09:40 -05:00

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#include "global.h"
#include "event_data.h"
#include "event_object_movement.h"
#include "field_weather.h"
#include "fieldmap.h"
#include "metatile_behavior.h"
#include "sprite.h"
#include "constants/event_objects.h"
#include "constants/flags.h"
#include "constants/maps.h"
#include "constants/metatile_behaviors.h"
#include "constants/vars.h"
static u8 sub_81D4890(u8);
static bool8 sub_81D4C14(struct EventObject*, u8);
static u8 sub_81D4C9C(struct EventObject*, u8);
static u8 sub_81D4C58(struct EventObject*, u8);
static u8 sub_81D4CE0(struct EventObject*, u8);
static u8 sub_81D4D24(u8);
static bool8 CanMewWalkToCoords(s16, s16);
static EWRAM_DATA u8 sUnknown_0203CF50 = 0;
static s16 sPlayerToMewDeltaX;
static s16 sPlayerToMewDeltaY;
static u8 sMewDirectionCandidates[4];
extern const struct SpritePalette gFieldEffectObjectPaletteInfo1;
extern const struct SpriteTemplate *const gFieldEffectObjectTemplatePointers[];
static const s16 sFarawayIslandRockCoords[4][2] =
{
{21, 16},
{25, 16},
{16, 17},
{20, 20},
};
static u8 GetMewEventObjectId(void)
{
u8 eventObjectId;
TryGetEventObjectIdByLocalIdAndMap(1, gSaveBlock1Ptr->location.mapNum, gSaveBlock1Ptr->location.mapGroup, &eventObjectId);
return eventObjectId;
}
u32 GetMewMoveDirection(void)
{
u8 i;
int skip;
struct EventObject *mew = &gEventObjects[GetMewEventObjectId()];
sPlayerToMewDeltaX = gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x - mew->currentCoords.x;
sPlayerToMewDeltaY = gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y - mew->currentCoords.y;
for (i = 0; i < ARRAY_COUNT(sMewDirectionCandidates); i++)
sMewDirectionCandidates[i] = DIR_NONE;
if (gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x == gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.x
&& gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y == gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.y)
{
return DIR_NONE;
}
if (VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) % 8 == 0)
mew->invisible = 0;
else
mew->invisible = 1;
if (VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) % 9 == 0)
return DIR_NONE;
for (i = 0; i < ARRAY_COUNT(sFarawayIslandRockCoords); i++)
{
if (gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x == sFarawayIslandRockCoords[i][0])
{
skip = 0;
if (gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y < sFarawayIslandRockCoords[i][1])
{
if (mew->currentCoords.y <= sFarawayIslandRockCoords[i][1])
skip = 1;
}
else
{
if (mew->currentCoords.y >= sFarawayIslandRockCoords[i][1])
skip = 1;
}
if (!skip)
{
if (sPlayerToMewDeltaX > 0)
{
if (mew->currentCoords.x + 1 == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x)
{
if (CanMewWalkToCoords(mew->currentCoords.x + 1, mew->currentCoords.y))
return DIR_EAST;
}
}
else if (sPlayerToMewDeltaX < 0)
{
if (mew->currentCoords.x - 1 == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x)
{
if (CanMewWalkToCoords(mew->currentCoords.x - 1, mew->currentCoords.y))
return DIR_WEST;
}
}
if (mew->currentCoords.x == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x)
{
if (sPlayerToMewDeltaY > 0)
{
if (CanMewWalkToCoords(mew->currentCoords.x, mew->currentCoords.y - 1))
return DIR_NORTH;
}
else
{
if (CanMewWalkToCoords(mew->currentCoords.x, mew->currentCoords.y + 1))
return DIR_SOUTH;
}
}
}
}
if (gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y == sFarawayIslandRockCoords[i][1])
{
skip = 0;
if (gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x < sFarawayIslandRockCoords[i][0])
{
if (mew->currentCoords.x <= sFarawayIslandRockCoords[i][0])
skip = 1;
}
else
{
if (mew->currentCoords.x >= sFarawayIslandRockCoords[i][0])
skip = 1;
}
if (!skip)
{
if (sPlayerToMewDeltaY > 0)
{
if (mew->currentCoords.y + 1 == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y)
{
if (CanMewWalkToCoords(mew->currentCoords.x, mew->currentCoords.y + 1))
return DIR_SOUTH;
}
}
else if (sPlayerToMewDeltaY < 0)
{
if (mew->currentCoords.y - 1 == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y)
{
if (CanMewWalkToCoords(mew->currentCoords.x, mew->currentCoords.y - 1))
return DIR_NORTH;
}
}
if (mew->currentCoords.y == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y)
{
if (sPlayerToMewDeltaX > 0)
{
if (CanMewWalkToCoords(mew->currentCoords.x - 1, mew->currentCoords.y))
return DIR_WEST;
}
else
{
if (CanMewWalkToCoords(mew->currentCoords.x + 1, mew->currentCoords.y))
return DIR_EAST;
}
}
}
}
}
if (sub_81D4C14(mew, 0))
{
if (sub_81D4C58(mew, 1))
return sub_81D4D24(2);
else if (sub_81D4CE0(mew, 1))
return sub_81D4D24(2);
else
return DIR_NORTH;
}
if (sub_81D4C9C(mew, 0))
{
if (sub_81D4C58(mew, 1))
return sub_81D4D24(2);
else if (sub_81D4CE0(mew, 1))
return sub_81D4D24(2);
else
return DIR_SOUTH;
}
if (sub_81D4C58(mew, 0))
{
if (sub_81D4C14(mew, 1))
return sub_81D4D24(2);
else if (sub_81D4C9C(mew, 1))
return sub_81D4D24(2);
else
return DIR_EAST;
}
if (sub_81D4CE0(mew, 0))
{
if (sub_81D4C14(mew, 1))
return sub_81D4D24(2);
else if (sub_81D4C9C(mew, 1))
return sub_81D4D24(2);
else
return DIR_WEST;
}
if (sPlayerToMewDeltaY == 0)
{
if (gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.y > mew->currentCoords.y)
{
if (CanMewWalkToCoords(mew->currentCoords.x, mew->currentCoords.y - 1))
return DIR_NORTH;
}
if (gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.y < mew->currentCoords.y)
{
if (CanMewWalkToCoords(mew->currentCoords.x, mew->currentCoords.y + 1))
return DIR_SOUTH;
}
if (CanMewWalkToCoords(mew->currentCoords.x, mew->currentCoords.y - 1))
return DIR_NORTH;
if (CanMewWalkToCoords(mew->currentCoords.x, mew->currentCoords.y + 1))
return DIR_SOUTH;
}
if (sPlayerToMewDeltaX == 0)
{
if (gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.x > mew->currentCoords.x)
{
if (CanMewWalkToCoords(mew->currentCoords.x - 1, mew->currentCoords.y))
return DIR_WEST;
}
if (gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.x < mew->currentCoords.x)
{
if (CanMewWalkToCoords(mew->currentCoords.x + 1, mew->currentCoords.y))
return DIR_EAST;
}
if (CanMewWalkToCoords(mew->currentCoords.x + 1, mew->currentCoords.y))
return DIR_EAST;
if (CanMewWalkToCoords(mew->currentCoords.x - 1, mew->currentCoords.y))
return DIR_WEST;
}
return sub_81D4890(DIR_NONE);
}
static bool8 CanMewWalkToCoords(s16 x, s16 y)
{
if (gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.x == x
&& gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.y == y)
{
return FALSE;
}
return MetatileBehavior_IsPokeGrass(MapGridGetMetatileBehaviorAt(x, y));
}
static u8 sub_81D4890(u8 ignoredDir)
{
u8 i;
u8 count = 0;
struct EventObject *mew = &gEventObjects[GetMewEventObjectId()];
for (i = 0; i < ARRAY_COUNT(sMewDirectionCandidates); i++)
sMewDirectionCandidates[i] = DIR_NONE;
if (CanMewWalkToCoords(mew->currentCoords.x, mew->currentCoords.y - 1) == TRUE && ignoredDir != DIR_NORTH)
{
sMewDirectionCandidates[count] = DIR_NORTH;
count++;
}
if (CanMewWalkToCoords(mew->currentCoords.x + 1, mew->currentCoords.y) == TRUE && ignoredDir != DIR_EAST)
{
sMewDirectionCandidates[count] = DIR_EAST;
count++;
}
if (CanMewWalkToCoords(mew->currentCoords.x, mew->currentCoords.y + 1) == TRUE && ignoredDir != DIR_SOUTH)
{
sMewDirectionCandidates[count] = DIR_SOUTH;
count++;
}
if (CanMewWalkToCoords(mew->currentCoords.x - 1, mew->currentCoords.y) == TRUE && ignoredDir != DIR_WEST)
{
sMewDirectionCandidates[count] = DIR_WEST;
count++;
}
if (count > 1)
return sMewDirectionCandidates[VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) % count];
else
return sMewDirectionCandidates[0];
}
void UpdateFarawayIslandStepCounter(void)
{
u16 steps = VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER);
if (gSaveBlock1Ptr->location.mapNum == MAP_NUM(FARAWAY_ISLAND_INTERIOR)
&& gSaveBlock1Ptr->location.mapGroup == MAP_GROUP(FARAWAY_ISLAND_INTERIOR))
{
steps++;
if (steps >= 9999)
VarSet(VAR_FARAWAY_ISLAND_STEP_COUNTER, 0);
else
VarSet(VAR_FARAWAY_ISLAND_STEP_COUNTER, steps);
}
}
bool8 EventObjectIsFarawayIslandMew(struct EventObject *eventObject)
{
if (gSaveBlock1Ptr->location.mapNum == MAP_NUM(FARAWAY_ISLAND_INTERIOR)
&& gSaveBlock1Ptr->location.mapGroup == MAP_GROUP(FARAWAY_ISLAND_INTERIOR))
{
if (eventObject->graphicsId == EVENT_OBJ_GFX_MEW)
return TRUE;
}
return FALSE;
}
bool8 IsMewPlayingHideAndSeek(void)
{
if (gSaveBlock1Ptr->location.mapNum == MAP_NUM(FARAWAY_ISLAND_INTERIOR)
&& gSaveBlock1Ptr->location.mapGroup == MAP_GROUP(FARAWAY_ISLAND_INTERIOR))
{
if (FlagGet(FLAG_CAUGHT_MEW) != TRUE && FlagGet(FLAG_HIDE_MEW) != TRUE)
return TRUE;
}
return FALSE;
}
bool8 sub_81D4A58(struct EventObject *eventObject)
{
if (VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) != 0xFFFF
&& VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) % 4 == 0)
return TRUE;
return FALSE;
}
void sub_81D4A90(void)
{
s16 x;
s16 y;
u8 spriteId;
struct EventObject *mew = &gEventObjects[GetMewEventObjectId()];
mew->invisible = 0;
if (gSpecialVar_0x8004 == 1)
{
mew->fixedPriority = 1;
gSprites[mew->spriteId].subspriteMode = SUBSPRITES_IGNORE_PRIORITY;
gSprites[mew->spriteId].subpriority = 1;
}
else
{
VarSet(VAR_FARAWAY_ISLAND_STEP_COUNTER, 0xFFFF);
mew->fixedPriority = 1;
gSprites[mew->spriteId].subspriteMode = SUBSPRITES_IGNORE_PRIORITY;
if (gSpecialVar_Facing != DIR_NORTH)
gSprites[mew->spriteId].subpriority = 1;
LoadSpritePalette(&gFieldEffectObjectPaletteInfo1);
UpdateSpritePaletteWithWeather(IndexOfSpritePaletteTag(gFieldEffectObjectPaletteInfo1.tag));
x = mew->currentCoords.x;
y = mew->currentCoords.y;
sub_80930E0(&x, &y, 8, 8);
sUnknown_0203CF50 = CreateSpriteAtEnd(gFieldEffectObjectTemplatePointers[15], x, y, gSprites[mew->spriteId].subpriority - 1);
if (sUnknown_0203CF50 != MAX_SPRITES)
{
struct Sprite *sprite = &gSprites[sUnknown_0203CF50];
sprite->coordOffsetEnabled = 1;
sprite->oam.priority = 2;
sprite->callback = SpriteCallbackDummy;
}
}
}
void sub_81D4BEC(void)
{
if (sUnknown_0203CF50 != MAX_SPRITES)
DestroySprite(&gSprites[sUnknown_0203CF50]);
}
static bool8 sub_81D4C14(struct EventObject *mew, u8 index)
{
if (sPlayerToMewDeltaY > 0 && CanMewWalkToCoords(mew->currentCoords.x, mew->currentCoords.y - 1))
{
sMewDirectionCandidates[index] = DIR_NORTH;
return TRUE;
}
return FALSE;
}
static u8 sub_81D4C58(struct EventObject *mew, u8 index)
{
if (sPlayerToMewDeltaX < 0 && CanMewWalkToCoords(mew->currentCoords.x + 1, mew->currentCoords.y))
{
sMewDirectionCandidates[index] = DIR_EAST;
return TRUE;
}
return FALSE;
}
static u8 sub_81D4C9C(struct EventObject *mew, u8 index)
{
if (sPlayerToMewDeltaY < 0 && CanMewWalkToCoords(mew->currentCoords.x, mew->currentCoords.y + 1))
{
sMewDirectionCandidates[index] = DIR_SOUTH;
return TRUE;
}
return FALSE;
}
static u8 sub_81D4CE0(struct EventObject *mew, u8 index)
{
if (sPlayerToMewDeltaX > 0 && CanMewWalkToCoords(mew->currentCoords.x - 1, mew->currentCoords.y))
{
sMewDirectionCandidates[index] = DIR_WEST;
return TRUE;
}
return FALSE;
}
static u8 sub_81D4D24(u8 mod)
{
return sMewDirectionCandidates[VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) % mod];
}
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