qreal value(qreal t)
{
qreal a = (_a < 0) ? 1.0f : _a;
switch(_t) {
case In:
return easeInBounce(t, a);
case Out:
return easeOutBounce(t, a);
case InOut:
return easeInOutBounce(t, a);
case OutIn:
return easeOutInBounce(t, a);
default:
return t;
}
}
double valueForProgress ( double a_fProgress ) const
{
double fAmplitude = (m_fAmplitude < 0.0) ? 1.0 : m_fAmplitude;
switch ( m_eType )
{
case In:
return easeInBounce ( a_fProgress, fAmplitude );
case Out:
return easeOutBounce ( a_fProgress, fAmplitude );
case InOut:
return easeInOutBounce ( a_fProgress, fAmplitude );
case OutIn:
return easeOutInBounce ( a_fProgress, fAmplitude );
default:
return a_fProgress;
}
}
static qreal easeOutBounce(qreal t)
{
const qreal a = 1;
return easeOutBounce(t, a);
}
/**
* Easing equation function for a bounce (exponentially decaying parabolic bounce) easing in/out: acceleration until halfway, then deceleration.
*
* @param t Current time (in frames or seconds).
* @param a Amplitude.
* @return The correct value.
*/
static qreal easeInOutBounce(qreal t, qreal a)
{
if (t < 0.5) return easeInBounce (2*t, a)/2;
else return (t == 1.0) ? 1.0 : easeOutBounce (2*t - 1, a)/2 + 0.5;
}
double easeInOutBounce(double t, double b, double c, double d)
{
if (t < d/2) return easeInBounce (t*2, 0, c, d) * .5 + b;
else return easeOutBounce (t*2-d, 0, c, d) * .5 + c*.5 + b;
}
double easeInBounce(double t, double b, double c, double d)
{
return c - easeOutBounce (d-t, 0, c, d) + b;
}