Listing 1 

class AnimatedObject {

// An interface to an animated object. Most comments are
// left out for brevity. See accompanying article for
// full descriptions of everything here.

// StandardTransitionTime is 1/10 second, 100 milliseconds


static const float StandardTransitionTime=100f;


// DefaultMsPerFrame is 1/30 second


static const float DefaultMsPerFrame=33.333333f;


// The intent is to provide an interface only, but some of the data
// mentioned in the article is presented below. Obviously, in a full
// animation engine implementation, there will be much more data
// in this object.


int currentAnimation;	  // ID of animation playing now
float currentAnimationTime;	// current frame of current animation
int nextAnimation;	// ID of next animation to play, -1 if none set
float msPerFrame;	// current playback rate setting
bool loopCurrentAnim;	// true if current animation should loop


// Every animated object has to have a pointer to the animation data
// it is capable of playing. Actual implementation is up to you.

AnimationData *animationData;

public:
AnimatedObject(AnimationData *animDataIn); // constructor
void PlayAnimation(int animNum, float startTime=0f, float transitionTime=0f);
inline void PlayAnimationAtTime(int animNum, float startTime)
{ PlayAnimation(animNum, startTime); }
inline void TransitionIntoAnimation(int animNum)
{ PlayAnimation(animNum, 0f, StandardTransitionTime); }
inline void TransitionIntoAnimationAtTime(int animNum, float startTime)
{ PlayAnimation(animNum, startTime, StandardTransitionTime); }

void SetNextAnimation(int next);

void EnableLoopedAnimation();
void DisableLoopedAnimation();
bool IsAnimationLooped();

void PlayNextAnimation();
void TransitionIntoNextAnimation();

void StopAnimation();
void StartAnimation();

void SetMsPerFrame(float newRate=DefaultMsPerFrame);
float GetMsPerFrame();

void CaptureRotationChannel(int which);
void CaptureTranslationChannel(int which);

int GetCurrentAnimation();
float GetAnimationTimeInMs();
float GetAnimationTimeInFrames();
bool InTransition();
bool IsAnimationLooped();

int GetNextAnimation();
void GetGlobalPosition(int joint, float &x, float &y, float &z);
void GetCurrentVelocity(float &x, float &y, float &z);
void SetCurrentVelocity(float x, float y, float z);
float GetAnimLengthInMs(int animNum);

};

Listing 2 

inline void PlayAnimationAtTime(int animNum, float startTime)
{ PlayAnimation(animNum, startTime); }

Listing 3 

inline void TransitionIntoAnimation(int animNum)
{ PlayAnimation(animNum, 0f, StandardTransitionTime); }

Listing 4 

inline void TransitionIntoAnimationAtTime(int animNum, float startTime)
{ PlayAnimation(animNum, startTime, StandardTransitionTime); }

Listing 5 

void EnableLoopedAnimation();
void DisableLoopedAnimation();
bool IsAnimationLooped();

Listing 6 

int GetNextAnimation();
void GetGlobalPosition(int joint, float &x, float &y, float &z);
void GetCurrentVelocity(float &x, float &y, float &z);
void SetCurrentVelocity(float x, float y, float z);
float GetAnimLengthInMs(int animNum);
bool IsAnimationLooped();