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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 plTimedValue_inc
#define plTimedValue_inc
#include "hsTimer.h"
#include "hsStream.h"
// plTimedValue
// To use, replace your member var of type T with plTimedValue<T>.
// You can then pretty much treat it as normal. To set it to interpolate
// to a new value over secs seconds, use Set(newVal, secs).
// For I/O, see plTimedSimple and plTimedCompound.
template <class T> class plTimedValue
{
protected:
T fGoal;
T fInit;
double fStart;
hsScalar fInvSecs;
public:
plTimedValue() {}
plTimedValue(const plTimedValue<T>& o) { Set(o, 0.f); }
plTimedValue(const T& v) { Set(v, 0.f); }
plTimedValue<T>& operator=(const plTimedValue<T>& o) { return Set(o, 0.f); }
plTimedValue<T>& operator=(const T& v) { return Set(v, 0.f); }
plTimedValue<T>& Set(const T& v, hsScalar secs=0);
operator T () const { return Value(); }
T Value() const;
};
// Read/Writable version of plTimedValue, for intrinsic types (e.g. int, float, bool).
// Must be a type that hsStream has an overloaded ReadSwap/WriteSwap defined.
template <class T> class plTimedSimple : public plTimedValue<T>
{
public:
plTimedSimple<T>& operator=(const plTimedValue<T>& o) { return Set(o, 0.f); }
plTimedSimple<T>& operator=(const T& v) { return Set(v, 0.f); }
plTimedSimple<T>& Set(const T& v, hsScalar secs=0) { plTimedValue<T>::Set(v, secs); return *this; }
void Read(hsStream* s);
void Write(hsStream* s) const;
};
// Read/Writable version of plTimedValue, for compound types (e.g. hsVector3, hsColorRGBA).
// May be any type that has Read(hsStream*)/Write(hsStream*) defined.
template <class T> class plTimedCompound : public plTimedValue<T>
{
public:
plTimedCompound<T>& operator=(const plTimedValue<T>& o) { return Set(o, 0.f); }
plTimedCompound<T>& operator=(const T& v) { return Set(v, 0.f); }
plTimedCompound<T>& Set(const T& v, hsScalar secs=0) { plTimedValue<T>::Set(v, secs); return *this; }
void Read(hsStream* s);
void Write(hsStream* s) const;
};
template <class T>
plTimedValue<T>& plTimedValue<T>::Set(const T& v, hsScalar secs)
{
if( secs <= 0 )
{
fGoal = fInit = v;
fInvSecs = 0;
}
else
{
fInit = Value();
fStart = hsTimer::GetSysSeconds();
fInvSecs = 1.f / secs;
fGoal = v;
}
return *this;
}
template <class T>
T plTimedValue<T>::Value() const
{
if( fInvSecs > 0 )
{
hsScalar t = (hsScalar)((hsTimer::GetSysSeconds() - fStart) * fInvSecs);
hsAssert(t >= 0, "Moving back in time");
if( t < 1.f )
return fGoal * t + fInit * (1.f - t);
}
return fGoal;
}
template <class T>
void plTimedSimple<T>::Read(hsStream* s)
{
T val;
s->ReadSwap(&val);
Set(val, 0.f);
}
template <class T>
void plTimedSimple<T>::Write(hsStream* s) const
{
T val = this->Value();
s->WriteSwap(val);
}
template <class T>
void plTimedCompound<T>::Read(hsStream* s)
{
T val;
val.Read(s);
Set(val, 0.f);
}
template <class T>
void plTimedCompound<T>::Write(hsStream* s) const
{
T val = this->Value();
val.Write(s);
}
#endif // plTimedValue_inc