EAPI double
ecore_animator_pos_map(double pos,
Ecore_Pos_Map map,
double v1,
double v2)
{
/* purely functional - locking not required */
if (pos > 1.0) pos = 1.0;
else if (pos < 0.0)
pos = 0.0;
switch (map)
{
case ECORE_POS_MAP_LINEAR:
return pos;
case ECORE_POS_MAP_ACCELERATE:
pos = 1.0 - _pos_map_sin(M_PI_2 + pos * M_PI_2);
return pos;
case ECORE_POS_MAP_DECELERATE:
pos = _pos_map_sin(pos * M_PI_2);
return pos;
case ECORE_POS_MAP_SINUSOIDAL:
pos = (1.0 - _pos_map_cos(pos * M_PI)) / 2.0;
return pos;
case ECORE_POS_MAP_ACCELERATE_FACTOR:
pos = _pos_map_accel_factor(pos, v1);
return pos;
case ECORE_POS_MAP_DECELERATE_FACTOR:
pos = 1.0 - _pos_map_accel_factor(1.0 - pos, v1);
return pos;
case ECORE_POS_MAP_SINUSOIDAL_FACTOR:
if (pos < 0.5) pos = _pos_map_accel_factor(pos * 2.0, v1) / 2.0;
else pos = 1.0 - (_pos_map_accel_factor((1.0 - pos) * 2.0, v1) / 2.0);
return pos;
case ECORE_POS_MAP_DIVISOR_INTERP:
pos = _pos_map_pow(pos, v1, (int)v2);
return pos;
case ECORE_POS_MAP_BOUNCE:
pos = _pos_map_spring(pos, (int)v2, v1);
if (pos < 0.0) pos = -pos;
pos = 1.0 - pos;
return pos;
case ECORE_POS_MAP_SPRING:
pos = 1.0 - _pos_map_spring(pos, (int)v2, v1);
return pos;
default:
return pos;
}
return pos;
}
static double
_pos_map_spring(double pos,
int bounces,
double decfac)
{
int segnum, segpos, b1, b2;
double len, decay, decpos, p2;
if (bounces < 0) bounces = 0;
p2 = _pos_map_pow(pos, 0.5, 3);
len = (M_PI / 2.0) + ((double)bounces * M_PI);
segnum = (bounces * 2) + 1;
segpos = 2 * (((int)(p2 * segnum) + 1) / 2);
b1 = segpos;
b2 = segnum + 1;
if (b1 < 0) b1 = 0;
decpos = (double)b1 / (double)b2;
decay = _pos_map_accel_factor(1.0 - decpos, decfac);
return _pos_map_sin((M_PI / 2.0) + (p2 * len)) * decay;
}
EAPI double
ecore_animator_pos_map(double pos,
Ecore_Pos_Map map,
double v1,
double v2)
{
/* purely functional - locking not required */
if (pos > 1.0) pos = 1.0;
else if (pos < 0.0)
pos = 0.0;
switch (map)
{
case ECORE_POS_MAP_LINEAR:
return pos;
case ECORE_POS_MAP_ACCELERATE:
/* pos = 1 - sin(Pi / 2 + pos * Pi / 2); */
pos = DBL_TO(SUB(INT_FROM(1), SIN(ADD((EINA_F32P32_PI >> 1), MUL(DBL_FROM(pos), (EINA_F32P32_PI >> 1))))));
return pos;
case ECORE_POS_MAP_DECELERATE:
/* pos = sin(pos * Pi / 2); */
pos = DBL_TO(SIN(MUL(DBL_FROM(pos), (EINA_F32P32_PI >> 1))));
return pos;
case ECORE_POS_MAP_SINUSOIDAL:
/* pos = (1 - cos(pos * Pi)) / 2 */
pos = DBL_TO((SUB(INT_FROM(1), COS(MUL(DBL_FROM(pos), EINA_F32P32_PI)))) >> 1);
return pos;
case ECORE_POS_MAP_ACCELERATE_FACTOR:
pos = _pos_map_accel_factor(pos, v1);
return pos;
case ECORE_POS_MAP_DECELERATE_FACTOR:
pos = 1.0 - _pos_map_accel_factor(1.0 - pos, v1);
return pos;
case ECORE_POS_MAP_SINUSOIDAL_FACTOR:
if (pos < 0.5) pos = _pos_map_accel_factor(pos * 2.0, v1) / 2.0;
else pos = 1.0 - (_pos_map_accel_factor((1.0 - pos) * 2.0, v1) / 2.0);
return pos;
case ECORE_POS_MAP_DIVISOR_INTERP:
pos = _pos_map_pow(pos, v1, (int)v2);
return pos;
case ECORE_POS_MAP_BOUNCE:
pos = _pos_map_spring(pos, (int)v2, v1);
if (pos < 0.0) pos = -pos;
pos = 1.0 - pos;
return pos;
case ECORE_POS_MAP_SPRING:
pos = 1.0 - _pos_map_spring(pos, (int)v2, v1);
return pos;
default:
return pos;
}
return pos;
}
