assimp/code/TargetAnimation.h

/*
Open Asset Import Library (ASSIMP)
----------------------------------------------------------------------

Copyright (c) 2006-2008, ASSIMP Development Team
All rights reserved.

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* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
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* Neither the name of the ASSIMP team, nor the names of its
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  written permission of the ASSIMP Development Team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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*/

/** @file Defines a helper class for the ASE and 3DS loaders to
 help them compute camera and spot light animation channels */
#ifndef AI_TARGET_ANIMATION_H_INC
#define AI_TARGET_ANIMATION_H_INC


namespace Assimp	{



// ---------------------------------------------------------------------------
/** Helper class to iterate through all keys in an animation channel.
 *
 *  Missing tracks are interpolated. This is a helper class for
 *  TargetAnimationHelper, but it can be freely used for other purposes.
*/
class ASSIMP_API KeyIterator
{
public:

	
	// ------------------------------------------------------------------
	/** Constructs a new key iterator
	 *
	 *  @param _objPos Object position track. May be NULL.
	 *  @param _targetObjPos Target object position track. May be NULL.
	 *  @param defaultObjectPos Default object position to be used if
	 *	  no animated track is available. May be NULL.
	 *  @param defaultTargetPos Default target position to be used if
	 *	  no animated track is available. May be NULL.
	 */
	KeyIterator(const std::vector<aiVectorKey>* _objPos,
		const std::vector<aiVectorKey>* _targetObjPos,
		const aiVector3D*  defaultObjectPos = NULL,
		const aiVector3D*  defaultTargetPos = NULL);

	// ------------------------------------------------------------------
	/** Returns true if all keys have been processed
	 */
	bool Finished() const
		{return reachedEnd;}

	// ------------------------------------------------------------------
	/** Increment the iterator
	 */
	void operator++();
	inline void operator++(int)
		{return ++(*this);}



	// ------------------------------------------------------------------
	/** Getters to retrieve the current state of the iterator
	 */
	inline const aiVector3D& GetCurPosition() const
		{return curPosition;}

	inline const aiVector3D& GetCurTargetPosition() const
		{return curTargetPosition;}

private:

	//! Did we reach the end?
	bool reachedEnd;

	//! Represents the current position of the iterator
	aiVector3D curPosition, curTargetPosition;

	double curTime;

	//! Input tracks and the next key to process
	const std::vector<aiVectorKey>* objPos,*targetObjPos;

	unsigned int nextObjPos, nextTargetObjPos;
	std::vector<aiVectorKey> defaultObjPos,defaultTargetObjPos;
};

// ---------------------------------------------------------------------------
/** Helper class for the 3DS and ASE loaders to compute camera and spot light
 *  animations.
 *
 * 3DS and ASE store the differently to Assimp - there is an animation
 * channel for the camera/spot light itself and a separate position
 * animation channels specifying the position of the camera/spot light
 * look-at target
*/
class ASSIMP_API TargetAnimationHelper
{
public:

	TargetAnimationHelper()
		:	targetPositions		(NULL)
		,	objectPositions		(NULL)
	{}


	// ------------------------------------------------------------------
	/** Sets the target animation channel
	 *
	 *  This channel specifies the position of the camera/spot light
	 *  target at a specific position.
	 *
	 *  @param targetPositions Translation channel
	 */
	void SetTargetAnimationChannel (const 
		std::vector<aiVectorKey>* targetPositions);


	// ------------------------------------------------------------------
	/** Sets the main animation channel
	 *
	 *  @param objectPositions Translation channel
	 */
	void SetMainAnimationChannel ( const
		std::vector<aiVectorKey>* objectPositions);

	// ------------------------------------------------------------------
	/** Sets the main animation channel to a fixed value 
	 *
	 *  @param fixed Fixed value for the main animation channel
	 */
	void SetFixedMainAnimationChannel(const aiVector3D& fixed);


	// ------------------------------------------------------------------
	/** Computes final animation channels
	 *
	 */
	void Process( std::vector<aiVectorKey>* distanceTrack );


private:

	const std::vector<aiVectorKey>* targetPositions,*objectPositions;
	aiVector3D fixedMain;
};


} // ! end namespace Assimp

#endif // include guard