object_orbit.h

Go to the documentation of this file.

#include "orbit.h"
#include "flags.h"
 
// Crossbone Isle, Kalay, Kolima's forest clearing, Lunpa, McCoy's palace
// garden, Mogall Forest and Vale: a Nut floating where it lies, until it is
// taken.
 
/// The Nut's callback, each frame: it sways up to two pixels either side of its
/// spot and dips up to two pixels below it, at a random pace.
static s32 SceneEffect_UpdateOrbitPosition(s32 *p) {
  s16 *q = (s16 *)p[20];
  s32 a, b;
  s32 d = Engine_MathSin(p[12]) * 2;
  if (d > 0)
    d = -d;
  p[2] = p[14] + Engine_MathCos(p[12]) * 2;
  p[3] = p[15] + d;
  q[15] = Engine_MathCos(p[12] + 0x8000) / 8;
  a = Engine_RandomNext();
  b = Engine_RandomNext();
  p[12] = p[12] + ((((u32)a << 9) >> 16) + (((u32)b << 9) >> 16)) + 0x400;
  return 0;
}
 
/// Draws actor id as the Nut's icon and starts it floating, 32 pixels up unless
/// the party returns to where it was.
void Scene_FloatNut(s32 id) {
  OrbitingSceneObject *actor;
  OrbitingSceneObjectSprite *sprite;
  u8 *transfer;
  s32 zero;
 
  actor = (OrbitingSceneObject *)Object_GetById(id);
  sprite = actor->sprite;
  sprite->flags09Mode = 1;
  sprite->flags05Bit5 = 0;
  sprite->flags09High = 0;
 
  zero = 0;
  sprite->state = zero;
  Engine_ActorSetSpriteFlags((struct FieldActor *)actor, zero);
  actor->active = zero;
  actor->mode = zero;
 
  if (Engine_GameFlagIsSet(FLAG_KEEP_PARTY_POSITION) == 0)
    actor->y += 0x200000;
 
  actor->flags23 &= 0xfe;
  actor->visible = 1;
 
  transfer = Engine_HeapAllocate(17, 0x608);
  Engine_ItemLoadIcon(ITEM_NUT);
  transfer += 0x400;
  Engine_VramLoad(sprite->palette, 128, transfer);
  Engine_HeapRelease(17);
 
  actor->orbitCenterX = actor->x;
  actor->orbitAngle = zero;
  actor->orbitCenterY = actor->y;
  actor->active = 1;
  actor->callback = (u32)SceneEffect_UpdateOrbitPosition;
  actor->state = zero;
}