From 39ed87570bdb2f86969d4be821c94b722dc71179 Mon Sep 17 00:00:00 2001
From: Joe Ludwig <joe@valvesoftware.com>
Date: Wed, 26 Jun 2013 15:22:04 -0700
Subject: First version of the SOurce SDK 2013

---
 mp/src/game/client/fx_interpvalue.cpp | 93 +++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 mp/src/game/client/fx_interpvalue.cpp

(limited to 'mp/src/game/client/fx_interpvalue.cpp')

diff --git a/mp/src/game/client/fx_interpvalue.cpp b/mp/src/game/client/fx_interpvalue.cpp
new file mode 100644
index 00000000..89559dfa
--- /dev/null
+++ b/mp/src/game/client/fx_interpvalue.cpp
@@ -0,0 +1,93 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================
+
+#include "cbase.h"
+#include "fx_interpvalue.h"
+
+CInterpolatedValue::CInterpolatedValue( void ) :  m_flStartTime( 0.0f ), m_flEndTime( 0.0f ), m_flStartValue( 0.0f ), m_flEndValue( 0.0f ), m_nInterpType( INTERP_LINEAR ) 
+{
+}
+
+CInterpolatedValue::CInterpolatedValue( float startTime, float endTime, float startValue, float endValue, InterpType_t type ) : 
+	  m_flStartTime( startTime ), m_flEndTime( endTime ), m_flStartValue( startValue ), m_flEndValue( endValue ), m_nInterpType( type ) 
+{
+}
+
+void CInterpolatedValue::SetTime( float start, float end ) 
+{ 
+	m_flStartTime = start; m_flEndTime = end; 
+}
+
+void CInterpolatedValue::SetRange( float start, float end ) 
+{ 
+	m_flStartValue = start; m_flEndValue = end; 
+}
+
+void CInterpolatedValue::SetType( InterpType_t type )
+{ 
+	m_nInterpType = type; 
+}
+	
+// Set the value with no range
+void CInterpolatedValue::SetAbsolute( float value )
+{
+	m_flStartValue = m_flEndValue = value;
+	m_flStartTime = m_flEndTime = gpGlobals->curtime;
+	m_nInterpType = INTERP_LINEAR;
+}
+
+// Set the value with range and time supplied
+void CInterpolatedValue::Init( float startValue, float endValue, float dt, InterpType_t type /*= INTERP_LINEAR*/ )
+{
+	if ( dt <= 0.0f )
+	{
+		SetAbsolute( endValue );
+		return;
+	}
+
+	SetTime( gpGlobals->curtime, gpGlobals->curtime + dt );
+	SetRange( startValue, endValue );
+	SetType( type );
+}
+
+// Start from the current value and move towards the end value
+void CInterpolatedValue::InitFromCurrent( float endValue, float dt, InterpType_t type /*= INTERP_LINEAR*/ )
+{
+	Init( Interp( gpGlobals->curtime ), endValue, dt, type );
+}
+
+// Find our interpolated value at the given point in time
+float CInterpolatedValue::Interp( float curTime )
+{
+	switch( m_nInterpType )
+	{
+	case INTERP_LINEAR:
+		{
+			if ( curTime >= m_flEndTime )
+				return m_flEndValue;
+
+			if ( curTime <= m_flStartTime )
+				return m_flStartValue;
+
+			return RemapVal( curTime, m_flStartTime, m_flEndTime, m_flStartValue, m_flEndValue );
+		}
+
+	case INTERP_SPLINE:
+		{
+			if ( curTime >= m_flEndTime )
+				return m_flEndValue;
+
+			if ( curTime <= m_flStartTime )
+				return m_flStartValue;
+
+			return SimpleSplineRemapVal( curTime, m_flStartTime, m_flEndTime, m_flStartValue, m_flEndValue );
+		}
+	}
+
+	// NOTENOTE: You managed to pass in a bogus interpolation type!
+	Assert(0);
+	return -1.0f;
+}
-- 
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