source: orxonox.OLD/trunk/src/util/animation/t_animation.h @ 10627

/*
   orxonox - the future of 3D-vertical-scrollers
 
   Copyright (C) 2004 orx
 
   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 2, or (at your option)
   any later version.
 
   ### File Specific:
   main-programmer: Benjamin Grauer
   co-programmer: ...
*/

/*!
 * @file t_animation.h
*/

#ifndef _T_ANIMATION_H
#define _T_ANIMATION_H

#include "animation.h"

#define DELTA_X 0.05  //!< the percentag of the distance that doesnt have to be done by neg_exp (asymptotical) ~ maschinendelta

//! A Struct for Keyframes that simply hold a float
typedef struct KeyFrameF
{
  float duration;             //!< duration of this keyframe
  float value;                //!< value of this keyframe
  ANIM_FUNCTION animFunc;     //!< with whitch function to iterate to the next KeyFrameF
};


//! A Class to handle some animation for single floated values.
template<class T> class tAnimation : public Animation
{
public:
  tAnimation(T* object = NULL, void (T::*funcToAnim)(float) = NULL);

  void setFuncToAnim(T* object, void (T::*funcToAnim)(float));

  void addKeyFrame(float value, float duration, ANIM_FUNCTION animFunc = ANIM_DEFAULT_FUNCTION);

  virtual void rewind();
  virtual void tick(float dt);

private:
  // animation functions
  void setAnimFunc(ANIM_FUNCTION animFunc);
  float constant(float timePassed) const;
  float linear(float timePassed) const;
  float sine(float timePassed) const;
  float cosine(float timePassed) const;
  float exp(float timePassed) const;
  float negExp(float timePassed) const;
  float quadratic(float timePassed) const;
  float random(float timePassed) const;


private:
  typedef std::list<KeyFrameF> KeyFrameList;
  typedef typename KeyFrameList::iterator KeyFrameIterator;

  //  ANIM_FUNCTION animFunc
  float (tAnimation<T>::*animFunc)(float) const;  //!< A Function for the AnimationType

  KeyFrameIterator   currentKeyFrame;                     //!< The current KeyFrame
  KeyFrameIterator   nextKeyFrame;                        //!< The KeyFrame we iterate to
  KeyFrameList       keyFrameList;                 //!< The KeyFrameList

  T* object;                                      //!< The Object from which to Animate something
  void (T::*funcToAnim)(float);                   //!< The function to Animate

  float expFactor;                                //!< some factors
};



/**
 *  standard constructor
*/
template<class T>
tAnimation<T>::tAnimation (T* object, void (T::*funcToAnim)(float))
{
  // create a new List
  KeyFrameF tmpKeyFrame;
  tmpKeyFrame.value = 0.0;
  tmpKeyFrame.duration = 1.0;
  keyFrameList.push_back(tmpKeyFrame);

  this->currentKeyFrame = keyFrameList.begin();
  this->nextKeyFrame = keyFrameList.begin();

  this->animFunc = &tAnimation<T>::linear;

  this->setFuncToAnim(object, funcToAnim);
}


/**
 *  rewinds the Animation to the beginning (first KeyFrame and time == 0)
*/
template<class T>
void tAnimation<T>::rewind()
{
  this->currentKeyFrame = keyFrameList.begin();
  this->nextKeyFrame = ++keyFrameList.begin();
  this->localTime = 0.0;
  this->setAnimFunc((*this->currentKeyFrame).animFunc);
}

/**
 *  sets the Function we want to animate
 * @param object from what object do we want to animate
 * @param funcToAnim which function
*/
template<class T>
void tAnimation<T>::setFuncToAnim(T* object, void (T::*funcToAnim)(float))
{
  this->baseObject = this->object = object;
  this->funcToAnim = funcToAnim;
}

/**
 *  Appends a new Keyframe
 * @param value the value of the new KeyFrame
 * @param duration The duration from the new KeyFrame to the next one
 * @param animFunc The function to animate between this keyFrame and the next one
*/
template<class T>
void tAnimation<T>::addKeyFrame(float value, float duration, ANIM_FUNCTION animFunc)
{
  // some small check
  if (duration <= 0.0)
    duration = 1.0;
  if (animFunc == ANIM_NULL)
    animFunc = ANIM_DEFAULT_FUNCTION;

  KeyFrameF& tmpKeyFrame = keyFrameList.front();

  // when adding the first frame
  if (this->keyFrameCount == 0)
  {
    this->setAnimFunc(animFunc);
  }
  else
  {
    this->keyFrameList.push_back(KeyFrameF());
    tmpKeyFrame = keyFrameList.back();
    // when adding the second frame
    if (this->currentKeyFrame == this->nextKeyFrame)
      this->nextKeyFrame = --keyFrameList.end();
  }

  tmpKeyFrame.value = value;
  tmpKeyFrame.duration = duration;
  tmpKeyFrame.animFunc = animFunc;
  this->keyFrameCount++;
}

/**
 *  ticks the Animation
 * @param dt how much time to tick
*/
template<class T>
void tAnimation<T>::tick(float dt)
{
  if (this->bRunning)
  {
    this->localTime += dt;
    if (localTime >= this->currentKeyFrame->duration)
    {
      if (likely(this->keyFramesToPlay != 0))
      {
        if (unlikely(this->keyFramesToPlay > 0))
          --this->keyFramesToPlay;
        // switching to the next Key-Frame
        this->localTime -= this->currentKeyFrame->duration;

        this->currentKeyFrame = this->nextKeyFrame;
        // checking, if we should still Play the animation
        if (this->currentKeyFrame == --this->keyFrameList.end())
          this->handleInfinity();
        this->nextKeyFrame = this->currentKeyFrame;
        this->nextKeyFrame++;

        //printf("%p from:%f to:%f\n", this->currentKeyFrame,this->currentKeyFrame->value, this->nextKeyFrame->value);
        this->setAnimFunc(this->currentKeyFrame->animFunc);
      }
      else
        this->pause();
    }

    (this->object->*(funcToAnim))((this->*animFunc)(this->localTime));
  }
}

/**
 *  Sets The kind of Animation between this keyframe and the next one
 * @param animFunc The Type of Animation to set
*/
template<class T>
void tAnimation<T>::setAnimFunc(ANIM_FUNCTION animFunc)
{
  switch (animFunc)
  {
  default:
  case ANIM_CONSTANT:
    this->animFunc = &tAnimation<T>::constant;
    break;
  case ANIM_LINEAR:
    this->animFunc = &tAnimation<T>::linear;
    break;
  case ANIM_SINE:
    this->animFunc = &tAnimation<T>::sine;
    break;
  case ANIM_COSINE:
    this->animFunc = &tAnimation<T>::cosine;
    break;
  case ANIM_EXP:
    this->animFunc = &tAnimation<T>::exp;
    break;
  case ANIM_NEG_EXP:
    this->animFunc = &tAnimation<T>::negExp;
    expFactor =  - 1.0 / this->currentKeyFrame->duration * logf(DELTA_X);
    break;
  case ANIM_QUADRATIC:
    this->animFunc = &tAnimation<T>::quadratic;
    break;
  case ANIM_RANDOM:
    this->animFunc = &tAnimation<T>::random;
    break;
  }
}


// animation functions
/**
 *  stays at the value of the currentKeyFrame
 * @param timePassed The time passed since this Keyframe began
*/
template<class T>
float tAnimation<T>::constant(float timePassed) const
{
  return this->currentKeyFrame->value;
}

/**
 *  linear interpolation between this keyframe and the next one
 * @param timePassed The time passed since this Keyframe began
*/
template<class T>
float tAnimation<T>::linear(float timePassed) const
{
  return this->currentKeyFrame->value + (this->nextKeyFrame->value - this->currentKeyFrame->value)
         * (timePassed / this->currentKeyFrame->duration);
}

/**
 *  a Sinusodial Interpolation between this keyframe and the next one
 * @param timePassed The time passed since this Keyframe began
*/
template<class T>
float tAnimation<T>::sine(float timePassed) const
{
  if (timePassed * 2.0 < this->currentKeyFrame->duration)
    return this->currentKeyFrame->value + (this->nextKeyFrame->value - this->currentKeyFrame->value)
           * sin( M_PI * timePassed / this->currentKeyFrame->duration)/2;
  else
    return this->nextKeyFrame->value - (this->nextKeyFrame->value - this->currentKeyFrame->value)
           * sin( M_PI * (1.0 - timePassed / this->currentKeyFrame->duration))/2;
  /*
  printf("::%f::::%f::\n",timePassed/this->currentKeyFrame->duration,retVal);
  return retVal;
  */
}

/**
 *  a cosine interpolation between this keyframe and the next one
 * @param timePassed The time passed since this Keyframe began
*/
template<class T>
float tAnimation<T>::cosine(float timePassed) const
{
  return ((this->nextKeyFrame->value + this->currentKeyFrame->value) +
          (this->currentKeyFrame->value - this->nextKeyFrame->value) *
          cos( M_PI * timePassed / this->currentKeyFrame->duration))/2;
}

/**
 *  an exponential interpolation between this keyframe and the next one
 * @param timePassed The time passed since this Keyframe began
*/
template<class T>
float tAnimation<T>::exp(float timePassed) const
{
  return this->linear(timePassed);
}

/**
 *  a negative exponential interpolation between this keyframe and the next one
 * @param timePassed The time passed since this Keyframe began
*/
template<class T>
float tAnimation<T>::negExp(float timePassed) const
{
  float d = this->currentKeyFrame->value - this->nextKeyFrame->value;
  float e = d * (1.0 - expf(- timePassed * expFactor));
  return  this->currentKeyFrame->value - e;
}

/**
 *  a quadratic interpolation between this keyframe and the next one
 * @param timePassed The time passed since this Keyframe began
*/
template<class T>
float tAnimation<T>::quadratic(float timePassed) const
{
  return this->linear(timePassed);
}

/**
 *  some random animation (fluctuating)
 * @param timePassed The time passed since this Keyframe began
*/
template<class T>
float tAnimation<T>::random(float timePassed) const
{
  return this->currentKeyFrame->value +
         (this->nextKeyFrame->value - this->currentKeyFrame->value) *
         (float)rand()/(float)RAND_MAX;
}

#endif /* _T_ANIMATION_H */