source: orxonox.OLD/orxonox/trunk/src/lib/particles/quick_animation.cc @ 4697

/*
   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: ...
   co-programmer: ...
*/

//#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_

#include "quick_animation.h"

#include "compiler.h"
#include "debug.h"
#ifndef NULL
#define NULL 0
#endif


using namespace std;

/**
   \brief standard constructor
*/
QuickAnimation::QuickAnimation (void)
{
   this->setClassID(CL_QUICK_ANIMATION, "QuickAnimation");

   // initialize the First KeyFrame (will be deleted if a new one gets created)
   this->count = 0;
   this->first = this->current = new QuickKeyFrame;
   this->first->next = this->first->prev = this->first;
   this->first->position = 0.0;
   this->first->value = 0.0;
}

/**
   \brief deletes all the deconstructor stuff
*/
QuickAnimation::~QuickAnimation (void)
{
  this->current = this->first;
  QuickKeyFrame* delKF = this->first;

  do
  {
    delKF = this->current;
    this->current = this->current->next;
    delete delKF;
  }  while (this->current != this->first);

}

/**
   \brief adds a new entry to the list of keyframes
   \param position the position to add the key to
   \param value the Value to set for the position
   \returns false if the key existed already for a given position
*/
void QuickAnimation::addEntry(float position, float value)
{
  // create the new KeyFrame
  QuickKeyFrame* newKey = new QuickKeyFrame;
  newKey->position = position;
  newKey->value = value;

  // if we add a KeyFrame for the first Time:
  if (unlikely (this->count == 0))
  {
    delete this->first;

    newKey->next  = newKey;
    newKey->prev  = newKey;
    this->first   = newKey;
    this->current = newKey;
  }
  // if the KeyFrame is in front of the FIRST keyFrame
  else if (this->first->position > position)
  {
    newKey->next = this->first;
    newKey->prev = this->first->prev;
    newKey->prev->next = newKey;
    newKey->next->prev = newKey;

    this->first = newKey; // the new Key becomes the FIRST.
  }
  // if the KeyFrame is at the End of the Animation
  else if (this->first->prev->position < position)
  {
    newKey->next = this->first;
    newKey->prev = this->first->prev;
    newKey->prev->next = newKey;
    newKey->next->prev = newKey;
  }
  // if the Key is between two frames.
  else
  {
    this->current = this->first;
    do
    {
      if (this->current->position < position && this->current->next->position > position)
        break;
      // if it is the same as an already existing keyframe
      else if (this->current->position == position)
      {
        this->current->value = value;
        delete newKey;
        return;
      }
      this->current = this->current->next;
    } while (this->current != this->first);

    newKey->next = this->current->next;
    newKey->prev = this->current;
    newKey->next->prev = newKey;
    newKey->prev->next = newKey;
  }
  this->current = this->first;
  ++this->count;
}

/**
   \brief changes an entry in the region of position
   \param position the Position of an existing keyframe
   \param region a deviation of the existing keyframe (like a delta in witch to search for
   \param value the new Value

   if the Entry at the in the region of the specified position is found, it will be changed.
    Otherwise a new KeyFrame will be created with value at position.
   \todo rimplement
*/
void QuickAnimation::changeEntry(float position, float value, float region)
{

  if ((this->first->position > position + region) || this->first->prev->position < position - region || this->count == 0)
    this->addEntry(position, value);
  else
  {
    this->current = this->first;
    do
    {
      if (this->current->position > position + region)
      {
        this->addEntry(position, value);
        return;
      }
      if (this->current->position < position+region && this->current->position > position-region)
      {
        this->current->value = value;
        return;
      }
      this->current = this->current->next;
    }  while (this->current != this->first);
  }
}


/**
 * removes a KeyFrame from the List.
 * @param position
 * @return
 */
void QuickAnimation::removeEntry(float position)
{
  this->current = this->first;

  if (this->count <= 0)
  {
    this->current->value = 0.0;
    this->current->position = 0.0;
    count = 0;
    return;
  }
  else
  {
    do
    {
      if (this->current->position == position)
      {
        if (this->current == this->first)
          this->first = this->first->next;
        this->current->next->prev = this->current->prev;
        this->current->prev->next = this->current->next;
        delete this->current;
        break;
      }
      this->current = this->current->next;
    } while (this->current != this->first);

    count --;
    this->current = this->first;
  }
}


/**
   \brief returns the value of the animation at a certain position
   \param position the position to get the value from :)
*/
float QuickAnimation::getValue(float position)
{
  while (true)
  {
    // if we have a match
    if (likely(this->current->position <= position && this->current->next->position >= position))
      return this->current->value + (this->current->next->value - this->current->value)
          * ((position-this->current->position) / (this->current->next->position -this->current->position));

    else if (unlikely(this->first->prev->position < position))
      return this->first->prev->value;
    else if (unlikely(this->first->position > position))
      return this->first->value;
    else if(likely(this->current->next->position < position))
      this->current = this->current->next;
    else if (likely(this->current->position > position))
      this->current = this->current->prev;
  }
}

/**
   \brief outputs some nice information about this class
*/
void QuickAnimation::debug(void)
{
  this->current = this->first;

  PRINT(0)("QuickAnim(entries:%d)::(position, value)", this->count);
  do
    {
      PRINT(0)("->(%f, %f)", this->current->position, this->current->value);
      this->current = this->current->next;
    } while(this->current != this->first);

  PRINT(0)("\n");
  this->current = this->first;
}