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movieobjects/dmetimeframe.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================
+#include "movieobjects/dmetimeframe.h"
+#include "tier0/dbg.h"
+#include "datamodel/dmelementfactoryhelper.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+
+//-----------------------------------------------------------------------------
+// Class factory 
+//-----------------------------------------------------------------------------
+IMPLEMENT_ELEMENT_FACTORY( DmeTimeFrame, CDmeTimeFrame );
+
+
+//-----------------------------------------------------------------------------
+// Constructor, destructor 
+//-----------------------------------------------------------------------------
+void CDmeTimeFrame::OnConstruction()
+{
+	m_Start   .InitAndSet( this, "startTime",    0, FATTRIB_HAS_CALLBACK );
+	m_Duration.InitAndSet( this, "durationTime", 0, FATTRIB_HAS_CALLBACK );
+	m_Offset  .InitAndSet( this, "offsetTime",   0 );
+	m_Scale   .InitAndSet( this, "scale",    1.0f );
+}
+
+void CDmeTimeFrame::OnDestruction()
+{
+}
+
+
+void CDmeTimeFrame::OnAttributeChanged( CDmAttribute *pAttribute )
+{
+	BaseClass::OnAttributeChanged( pAttribute );
+
+	// notify parent clip that the time has changed
+	if ( pAttribute == m_Start.GetAttribute() || pAttribute == m_Duration.GetAttribute() )
+	{
+		InvokeOnAttributeChangedOnReferrers( GetHandle(), pAttribute );
+	}
+}
+
+void CDmeTimeFrame::SetEndTime( DmeTime_t endTime, bool bChangeDuration )
+{
+	if ( bChangeDuration )
+	{
+		m_Duration = endTime.GetTenthsOfMS() - m_Start;
+	}
+	else
+	{
+		m_Start = endTime.GetTenthsOfMS() - m_Duration;
+	}
+}
+
+void CDmeTimeFrame::SetTimeScale( float flScale, DmeTime_t scaleCenter, bool bChangeDuration )
+{
+#ifdef _DEBUG
+	DmeTime_t preCenterTime = ToChildMediaTime( scaleCenter, false );
+#endif
+
+	float ratio = m_Scale / flScale;
+	int t = scaleCenter.GetTenthsOfMS() - m_Start;
+
+	if ( bChangeDuration )
+	{
+		int newDuration = int( m_Duration * ratio );
+
+		if ( scaleCenter.GetTenthsOfMS() != m_Start )
+		{
+			int newStart = int( ( m_Start - scaleCenter.GetTenthsOfMS() ) * ratio + scaleCenter.GetTenthsOfMS() );
+			SetStartTime( DmeTime_t( newStart ) );
+		}
+
+		int newStart = m_Start;
+		int newOffset = int( ( t + m_Offset ) * ratio + newStart - scaleCenter.GetTenthsOfMS() );
+		SetTimeOffset( DmeTime_t( newOffset ) );
+		SetDuration( DmeTime_t( newDuration ) );
+	}
+	else
+	{
+		int newOffset = int( ( t + m_Offset ) * ratio - t );
+		SetTimeOffset( DmeTime_t( newOffset ) );
+	}
+
+	SetTimeScale( flScale );
+
+#ifdef _DEBUG
+	DmeTime_t postCenterTime = ToChildMediaTime( scaleCenter, false );
+	Assert( abs( preCenterTime - postCenterTime ) <= DMETIME_MINDELTA );
+#endif
+}