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improve tween synchronization

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This commit is contained in:
Chris Danford
2003-05-16 21:09:26 +00:00
parent 5227ac7ea1
commit c97ead322e
1 changed files with 41 additions and 37 deletions
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stepmania/src/Actor.cpp
+39 -35
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@@ -203,48 +203,52 @@ void Actor::EndDraw()
void Actor::UpdateTweening( float fDeltaTime ) void Actor::UpdateTweening( float fDeltaTime )
{ {
// update tweening while( 1 )
if( m_TweenStates.empty() )
return;
// we are performing a tween
TweenState &TS = m_TweenStates[0]; // earliest tween
TweenInfo &TI = m_TweenInfo[0]; // earliest tween
if( TI.m_fTimeLeftInTween == TI.m_fTweenTime ) // we are just beginning this tween
{ {
// set the start position if( m_TweenStates.empty() ) // nothing to do
m_start = m_current; return;
}
TI.m_fTimeLeftInTween -= fDeltaTime; if( fDeltaTime == 0 ) // nothing will change
return;
if( TI.m_fTimeLeftInTween <= 0 ) // The tweening is over. Stop the tweening // update current tween state
{ TweenState &TS = m_TweenStates[0]; // earliest tween
m_current = TS; TweenInfo &TI = m_TweenInfo[0]; // earliest tween
// delete the head tween if( TI.m_fTimeLeftInTween == TI.m_fTweenTime ) // we are just beginning this tween
m_TweenStates.erase( m_TweenStates.begin() ); m_start = m_current; // set the start position
m_TweenInfo.erase( m_TweenInfo.begin() );
}
else // in the middle of tweening. Recalcute the current position.
{
const float fPercentThroughTween = 1-(TI.m_fTimeLeftInTween / TI.m_fTweenTime);
// distort the percentage if appropriate float fSecsToSubtract = min( TI.m_fTimeLeftInTween, fDeltaTime );
float fPercentAlongPath = 0.f; TI.m_fTimeLeftInTween -= fSecsToSubtract;
switch( TI.m_TweenType ) fDeltaTime -= fSecsToSubtract;
if( TI.m_fTimeLeftInTween == 0 ) // Current tween is over. Stop.
{ {
case TWEEN_LINEAR: fPercentAlongPath = fPercentThroughTween; break; m_current = TS;
case TWEEN_ACCELERATE: fPercentAlongPath = fPercentThroughTween * fPercentThroughTween; break;
case TWEEN_DECELERATE: fPercentAlongPath = 1 - (1-fPercentThroughTween) * (1-fPercentThroughTween); break;
case TWEEN_BOUNCE_BEGIN:fPercentAlongPath = 1 - sinf( 1.1f + fPercentThroughTween*(PI-1.1f) ) / 0.89f; break;
case TWEEN_BOUNCE_END: fPercentAlongPath = sinf( 1.1f + (1-fPercentThroughTween)*(PI-1.1f) ) / 0.89f; break;
case TWEEN_SPRING: fPercentAlongPath = 1 - cosf( fPercentThroughTween*PI*2.5f )/(1+fPercentThroughTween*3); break;
default: ASSERT(0);
}
TweenState::MakeWeightedAverage( m_current, m_start, TS, fPercentAlongPath ); // delete the head tween
m_TweenStates.erase( m_TweenStates.begin() );
m_TweenInfo.erase( m_TweenInfo.begin() );
}
else // in the middle of tweening. Recalcute the current position.
{
const float fPercentThroughTween = 1-(TI.m_fTimeLeftInTween / TI.m_fTweenTime);
// distort the percentage if appropriate
float fPercentAlongPath = 0.f;
switch( TI.m_TweenType )
{
case TWEEN_LINEAR: fPercentAlongPath = fPercentThroughTween; break;
case TWEEN_ACCELERATE: fPercentAlongPath = fPercentThroughTween * fPercentThroughTween; break;
case TWEEN_DECELERATE: fPercentAlongPath = 1 - (1-fPercentThroughTween) * (1-fPercentThroughTween); break;
case TWEEN_BOUNCE_BEGIN:fPercentAlongPath = 1 - sinf( 1.1f + fPercentThroughTween*(PI-1.1f) ) / 0.89f; break;
case TWEEN_BOUNCE_END: fPercentAlongPath = sinf( 1.1f + (1-fPercentThroughTween)*(PI-1.1f) ) / 0.89f; break;
case TWEEN_SPRING: fPercentAlongPath = 1 - cosf( fPercentThroughTween*PI*2.5f )/(1+fPercentThroughTween*3); break;
default: ASSERT(0);
}
TweenState::MakeWeightedAverage( m_current, m_start, TS, fPercentAlongPath );
}
} }
} }