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game/client/simple_keys.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================//
+
+#include "cbase.h"
+#include "simple_keys.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+//-----------------------------------------------------------------------------
+// Simple key interpolations
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : &out - 
+//			t - 
+//			&start - 
+//			&end - 
+//-----------------------------------------------------------------------------
+void CSimpleKeyInterp::Interp( Vector &out, float t, const CSimpleKeyInterp &start, const CSimpleKeyInterp &end )
+{
+	float delta = end.GetTime() - start.GetTime();
+	t = clamp( t-start.GetTime(), 0.f, delta );
+
+	float unitT = (delta > 0) ? (t / delta) : 1;
+
+	switch( end.m_interp )
+	{
+	case KEY_SPLINE:
+		unitT = SimpleSpline( unitT );
+		break;
+	case KEY_ACCELERATE:
+		unitT *= unitT;
+		break;
+	case KEY_DECELERATE:
+		unitT = sqrt(unitT);
+		break;
+	default:
+	case KEY_LINEAR:
+		//unitT = unitT;
+		break;
+	}
+	out = (1-unitT) * ((Vector)start) + unitT * ((Vector)end);
+}
+
+//-----------------------------------------------------------------------------
+// Simple key list
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : &key - 
+// Output : int
+//-----------------------------------------------------------------------------
+int CSimpleKeyList::Insert( const CSimpleKeyInterp &key )
+{
+	for ( int i = 0; i < m_list.Count(); i++ )
+	{
+		if ( key.GetTime() < m_list[i].GetTime() )
+			return m_list.InsertBefore( i, key );
+	}
+
+	return m_list.AddToTail( key );
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : &out - 
+//			t - 
+// Output : Returns true on success, false on failure.
+//-----------------------------------------------------------------------------
+bool CSimpleKeyList::Interp( Vector &out, float t )
+{
+	int startIndex = -1;
+
+	out.Init();
+	for ( int i = 0; i < m_list.Count(); i++ )
+	{
+		if ( t < m_list[i].GetTime() )
+		{
+			// before start
+			if ( startIndex < 0 )
+				return false;
+			CSimpleKeyInterp::Interp( out, t, m_list[startIndex], m_list[i] );
+			return true;
+		}
+		startIndex = i;
+	}
+
+	// past end
+	return false;
+}