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# Ogre::AnimationTrack Class Reference

A 'track' in an animation sequence, ie a sequence of keyframes which affect a certain type of animable object. More...

`#include <OgreAnimationTrack.h>`

Inheritance diagram for Ogre::AnimationTrack:
[legend]

List of all members.

## Public Member Functions
| AnimationTrack (Animation *parent, unsigned short handle)
| Constructor.
virtual | ~AnimationTrack ()
unsigned short | getHandle (void) const
| Get the handle associated with this track.
virtual unsigned short | getNumKeyFrames (void) const
| Returns the number of keyframes in this animation.
virtual KeyFrame * | getKeyFrame (unsigned short index) const
| Returns the KeyFrame at the specified index.
virtual Real | getKeyFramesAtTime (const TimeIndex &timeIndex, KeyFrame **keyFrame1, KeyFrame **keyFrame2, unsigned short *firstKeyIndex=0) const
| Gets the 2 KeyFrame objects which are active at the time given, and the blend value between them.
virtual KeyFrame * | createKeyFrame (Real timePos)
| Creates a new KeyFrame and adds it to this animation at the given time index.
virtual void | removeKeyFrame (unsigned short index)
| Removes a KeyFrame by it's index.
virtual void | removeAllKeyFrames (void)
| Removes all the KeyFrames from this track.
virtual void | getInterpolatedKeyFrame (const TimeIndex &timeIndex, KeyFrame *kf) const =0
| Gets a KeyFrame object which contains the interpolated transforms at the time index specified.
virtual void | apply (const TimeIndex &timeIndex, Real weight=1.0, Real scale=1.0f)=0
| Applies an animation track to the designated target.
virtual void | _keyFrameDataChanged (void) const
| Internal method used to tell the track that keyframe data has been changed, which may cause it to rebuild some internal data.
virtual bool | hasNonZeroKeyFrames (void) const
| Method to determine if this track has any KeyFrames which are doing anything useful - can be used to determine if this track can be optimised out.
virtual void | optimise (void)
| Optimise the current track by removing any duplicate keyframes.
virtual void | _collectKeyFrameTimes (std::vector< Real > &keyFrameTimes)
| Internal method to collect keyframe times, in unique, ordered format.
virtual void | _buildKeyFrameIndexMap (const std::vector< Real > &keyFrameTimes)
| Internal method to build keyframe time index map to translate global lower bound index to local lower bound index.
## Protected Types
typedef std::vector < KeyFrame * > | KeyFrameList
typedef std::vector < ushort > | KeyFrameIndexMap
| Map used to translate global keyframe time lower bound index to local lower bound index.
## Protected Member Functions
virtual KeyFrame * | createKeyFrameImpl (Real time)=0
| Create a keyframe implementation - must be overridden.
virtual void | populateClone (AnimationTrack *clone) const
| Internal method for clone implementation.
## Protected Attributes
KeyFrameList | mKeyFrames
Animation * | mParent
unsigned short | mHandle
KeyFrameIndexMap | mKeyFrameIndexMap

## Detailed Description

A 'track' in an animation sequence, ie a sequence of keyframes which affect a certain type of animable object.

Remarks:
  This class is intended as a base for more complete classes which will actually animate specific types of object, e.g. a bone in a skeleton to affect skeletal animation. An animation will likely include multiple tracks each of which can be made up of many KeyFrame instances. Note that the use of tracks allows each animable object to have it's own number of keyframes, i.e. you do not have to have the maximum number of keyframes for all animable objects just to cope with the most animated one.

  Since the most common animable object is a Node, there are options in this class for associating the track with a Node which will receive keyframe updates automatically when the 'apply' method is called.

  By default rotation is done using shortest-path algorithm. It is possible to change this behaviour using setUseShortestRotationPath() method.

Definition at line 116 of file OgreAnimationTrack.h.

## Member Typedef Documentation

typedef std::vector<KeyFrame*> Ogre::AnimationTrack::KeyFrameList`[protected]`

Definition at line 216 of file OgreAnimationTrack.h.

typedef std::vector<ushort> Ogre::AnimationTrack::KeyFrameIndexMap`[protected]`

Map used to translate global keyframe time lower bound index to local lower bound index.

Definition at line 222 of file OgreAnimationTrack.h.

## Constructor & Destructor Documentation

Ogre::AnimationTrack::AnimationTrack | ( | Animation * | parent,
|  | unsigned short | handle |
| ) |  |  |

Constructor.

virtual Ogre::AnimationTrack::~AnimationTrack | ( |  | ) | `[virtual]`

## Member Function Documentation

unsigned short Ogre::AnimationTrack::getHandle | ( | void |  | ) | const

Get the handle associated with this track.

Definition at line 125 of file OgreAnimationTrack.h.

virtual unsigned short Ogre::AnimationTrack::getNumKeyFrames | ( | void |  | ) | const`[virtual]`

Returns the number of keyframes in this animation.

virtual KeyFrame* Ogre::AnimationTrack::getKeyFrame | ( | unsigned short | index | ) | const`[virtual]`

Returns the KeyFrame at the specified index.

virtual Real Ogre::AnimationTrack::getKeyFramesAtTime | ( | const TimeIndex & | timeIndex,
|  | KeyFrame ** | keyFrame1,
|  | KeyFrame ** | keyFrame2,
|  | unsigned short * | firstKeyIndex = `0` |
| ) |  |  | const`[virtual]`

Gets the 2 KeyFrame objects which are active at the time given, and the blend value between them.

Remarks:
  At any point in time in an animation, there are either 1 or 2 keyframes which are 'active', 1 if the time index is exactly on a keyframe, 2 at all other times i.e. the keyframe before and the keyframe after.

  This method returns those keyframes given a time index, and also returns a parametric value indicating the value of 't' representing where the time index falls between them. E.g. if it returns 0, the time index is exactly on keyFrame1, if it returns 0.5 it is half way between keyFrame1 and keyFrame2 etc.

Parameters:

  | timeIndex | The time index.
  | keyFrame1 | Pointer to a KeyFrame pointer which will receive the pointer to the keyframe just before or at this time index.
  | keyFrame2 | Pointer to a KeyFrame pointer which will receive the pointer to the keyframe just after this time index.
  | firstKeyIndex | Pointer to an unsigned short which, if supplied, will receive the index of the 'from' keyframe incase the caller needs it.

Returns:
  Parametric value indicating how far along the gap between the 2 keyframes the timeIndex value is, e.g. 0.0 for exactly at 1, 0.25 for a quarter etc. By definition the range of this value is: 0.0 <= returnValue < 1.0 .

virtual KeyFrame* Ogre::AnimationTrack::createKeyFrame | ( | Real | timePos | ) | `[virtual]`

Creates a new KeyFrame and adds it to this animation at the given time index.

Remarks:
  It is better to create KeyFrames in time order. Creating them out of order can result in expensive reordering processing. Note that a KeyFrame at time index 0.0 is always created for you, so you don't need to create this one, just access it using getKeyFrame(0);

Note:
  this method will always create a keyframe even if the track already has a keyframe at the given time position.

Parameters:

  | timePos | The time from which this KeyFrame will apply.

virtual void Ogre::AnimationTrack::removeKeyFrame | ( | unsigned short | index | ) | `[virtual]`

Removes a KeyFrame by it's index.

virtual void Ogre::AnimationTrack::removeAllKeyFrames | ( | void |  | ) | `[virtual]`

Removes all the KeyFrames from this track.

virtual void Ogre::AnimationTrack::getInterpolatedKeyFrame | ( | const TimeIndex & | timeIndex,
|  | KeyFrame * | kf |
| ) |  |  | const`[pure virtual]`

Gets a KeyFrame object which contains the interpolated transforms at the time index specified.

Remarks:
  The KeyFrame objects held by this class are transformation snapshots at discrete points in time. Normally however, you want to interpolate between these keyframes to produce smooth movement, and this method allows you to do this easily. In animation terminology this is called 'tweening'.

Parameters:

  | timeIndex | The time (in relation to the whole animation sequence)
  | kf | Keyframe object to store results

Implemented in Ogre::NumericAnimationTrack, Ogre::NodeAnimationTrack, and Ogre::VertexAnimationTrack.

virtual void Ogre::AnimationTrack::apply | ( | const TimeIndex & | timeIndex,
|  | Real | weight = `1.0`,
|  | Real | scale = `1.0f` |
| ) |  |  | `[pure virtual]`

Applies an animation track to the designated target.

Parameters:

  | timeIndex | The time position in the animation to apply.
  | weight | The influence to give to this track, 1.0 for full influence, less to blend with other animations.
  | scale | The scale to apply to translations and scalings, useful for adapting an animation to a different size target.

Implemented in Ogre::NumericAnimationTrack, Ogre::NodeAnimationTrack, and Ogre::VertexAnimationTrack.

virtual void Ogre::AnimationTrack::_keyFrameDataChanged | ( | void |  | ) | const`[virtual]`

Internal method used to tell the track that keyframe data has been changed, which may cause it to rebuild some internal data.

Reimplemented in Ogre::NodeAnimationTrack.

Definition at line 197 of file OgreAnimationTrack.h.

virtual bool Ogre::AnimationTrack::hasNonZeroKeyFrames | ( | void |  | ) | const`[virtual]`

Method to determine if this track has any KeyFrames which are doing anything useful - can be used to determine if this track can be optimised out.

Reimplemented in Ogre::NodeAnimationTrack, and Ogre::VertexAnimationTrack.

Definition at line 203 of file OgreAnimationTrack.h.

virtual void Ogre::AnimationTrack::optimise | ( | void |  | ) | `[virtual]`

Optimise the current track by removing any duplicate keyframes.

Reimplemented in Ogre::NodeAnimationTrack, and Ogre::VertexAnimationTrack.

Definition at line 206 of file OgreAnimationTrack.h.

virtual void Ogre::AnimationTrack::_collectKeyFrameTimes | ( | std::vector< Real > & | keyFrameTimes | ) | `[virtual]`

Internal method to collect keyframe times, in unique, ordered format.

virtual void Ogre::AnimationTrack::_buildKeyFrameIndexMap | ( | const std::vector< Real > & | keyFrameTimes | ) | `[virtual]`

Internal method to build keyframe time index map to translate global lower bound index to local lower bound index.

virtual KeyFrame* Ogre::AnimationTrack::createKeyFrameImpl | ( | Real | time | ) | `[protected, pure virtual]`

Create a keyframe implementation - must be overridden.

Implemented in Ogre::NumericAnimationTrack, Ogre::NodeAnimationTrack, and Ogre::VertexAnimationTrack.

virtual void Ogre::AnimationTrack::populateClone | ( | AnimationTrack * | clone | ) | const`[protected, virtual]`

Internal method for clone implementation.

## Member Data Documentation

KeyFrameList Ogre::AnimationTrack::mKeyFrames`[protected]`

Definition at line 217 of file OgreAnimationTrack.h.

Animation* Ogre::AnimationTrack::mParent`[protected]`

Definition at line 218 of file OgreAnimationTrack.h.

unsigned short Ogre::AnimationTrack::mHandle`[protected]`

Definition at line 219 of file OgreAnimationTrack.h.

KeyFrameIndexMap Ogre::AnimationTrack::mKeyFrameIndexMap`[protected]`

Definition at line 223 of file OgreAnimationTrack.h.

The documentation for this class was generated from the following file:

- OgreAnimationTrack.h

Copyright © 2000-2005 by The OGRE Team
This work is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.
Last modified Mon Jun 16 12:49:07 2008