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/*==LICENSE==*
CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
You can contact Cyan Worlds, Inc. by email legal@cyan.com
or by snail mail at:
Cyan Worlds, Inc.
14617 N Newport Hwy
Mead, WA 99021
*==LICENSE==*/
#ifndef hsTimedValue_inc
#define hsTimedValue_inc
#include "hsStream.h"
template <class T>
class hsTimedValue {
public:
enum {
kIdle = 0x1,
kInstant = 0x2
};
protected:
UInt32 fFlags;
hsScalar fDuration;
hsScalar fStartTime;
T fValue;
T fGoal;
T fFrom;
public:
hsTimedValue() : fFlags(kIdle|kInstant), fDuration(0) {}
hsTimedValue(const T& v) : fFlags(kIdle|kInstant), fDuration(0) { SetValue(v); }
UInt32 GetFlags() { return fFlags; }
void SetDuration(hsScalar duration);
hsScalar GetDuration() const { return fDuration; }
hsBool32 operator==(const hsTimedValue<T>& v);
hsTimedValue<T>& operator=(const T& v) { SetValue(v); return *this; }
hsTimedValue<T>& operator+=(const T& v) { SetValue(v + fValue); return *this; }
void SetTempValue(const T& v) { fValue = v; }
void SetValue(const T& v) { fFrom = fGoal = fValue = v; fFlags |= kIdle; }
const T& GetValue() const { return fValue; }
void SetGoal(const T& g) { fGoal = g; }
const T& GetGoal() const { return fGoal; }
void Reset() { fFlags |= (kIdle | kInstant); }
void StartClock(hsScalar s);
hsScalar GetStartTime() const { return fStartTime; }
const T& GetFrom() const { return fFrom; }
void Update(hsScalar s);
void WriteScalar(hsStream* s, hsScalar currSecs);
void Write(hsStream* s, hsScalar currSecs);
void ReadScalar(hsStream* s, hsScalar currSecs);
void Read(hsStream* s, hsScalar currSecs);
};
template <class T>
void hsTimedValue<T>::WriteScalar(hsStream* s, hsScalar currSecs)
{
s->WriteSwap32(fFlags);
s->WriteSwapScalar(fValue);
if( !(fFlags & kIdle) )
{
s->WriteSwapScalar(fDuration);
s->WriteSwapScalar(currSecs - fStartTime);
s->WriteSwapScalar(fGoal);
s->WriteSwapScalar(fFrom);
}
}
template <class T>
void hsTimedValue<T>::Write(hsStream* s, hsScalar currSecs)
{
s->WriteSwap32(fFlags);
fValue.Write(s);
if( !(fFlags & kIdle) )
{
s->WriteSwapScalar(fDuration);
s->WriteSwapScalar(currSecs - fStartTime);
fGoal.Write(s);
fFrom.Write(s);
}
}
template <class T>
void hsTimedValue<T>::ReadScalar(hsStream* s, hsScalar currSecs)
{
fFlags = s->ReadSwap32();
fValue = s->ReadSwapScalar();
if( !(fFlags & kIdle) )
{
fDuration = s->ReadSwapScalar();
fStartTime = currSecs - s->ReadSwapScalar();
fGoal = s->ReadSwapScalar();
fFrom = s->ReadSwapScalar();
}
}
template <class T>
void hsTimedValue<T>::Read(hsStream* s, hsScalar currSecs)
{
fFlags = s->ReadSwap32();
fValue.Read(s);
if( !(fFlags & kIdle) )
{
fDuration = s->ReadSwapScalar();
fStartTime = currSecs - s->ReadSwapScalar();
fGoal.Read(s);
fFrom.Read(s);
}
}
template <class T>
void hsTimedValue<T>::SetDuration(hsScalar duration)
{
fDuration = duration;
if( fDuration > 0 )
fFlags &= ~kInstant;
else
fFlags |= kInstant;
}
template <class T>
hsBool32 hsTimedValue<T>::operator==(const hsTimedValue<T>& v)
{
if ((fFlags == v.fFlags) &&
(fDuration == v.fDuration) &&
(fStartTime == v.fStartTime) &&
(fValue == v.fValue) &&
(fGoal == v.fGoal) &&
(fFrom == v.fFrom))
{
return true;
}
return false;
}
template <class T>
void hsTimedValue<T>::StartClock(hsScalar s)
{
fStartTime = s;
if( fFlags & kInstant )
{
fFlags |= kIdle;
fValue = fGoal;
return;
}
fFlags &= ~kIdle;
if( fValue == fGoal )
fFlags |= kIdle;
fFrom = fValue;
}
template <class T>
void hsTimedValue<T>::Update(hsScalar s)
{
if( fFlags & kIdle )
return;
hsAssert(fDuration > 0, "Instant should always be idle");
hsScalar interp = (s - fStartTime) / fDuration;
if( interp >= hsScalar1 )
{
fValue = fGoal;
interp = hsScalar1;
fFlags |= kIdle;
}
else
fValue = fFrom + (fGoal - fFrom) * interp;
}
#endif // hsTimedValue_inc