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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:

Inheritance graph
[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 KeyFramegetKeyFrame (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 KeyFramecreateKeyFrame (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< ushortKeyFrameIndexMap
 Map used to translate global keyframe time lower bound index to local lower bound index.

Protected Member Functions

virtual KeyFramecreateKeyFrameImpl (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
AnimationmParent
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<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.

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

Definition at line 216 of file OgreAnimationTrack.h.


Constructor & Destructor Documentation

Ogre::AnimationTrack::AnimationTrack Animation parent,
unsigned short  handle
 

Constructor.

virtual Ogre::AnimationTrack::~AnimationTrack  )  [virtual]
 


Member Function Documentation

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

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

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 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 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 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.

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

Get the handle associated with this track.

Definition at line 125 of file OgreAnimationTrack.h.

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

Returns the number of keyframes in this animation.

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::populateClone AnimationTrack clone  )  const [protected, virtual]
 

Internal method for clone implementation.

virtual void Ogre::AnimationTrack::removeAllKeyFrames void   )  [virtual]
 

Removes all the KeyFrames from this track.

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

Removes a KeyFrame by it's index.


Member Data Documentation

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.

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.


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

Copyright © 2000-2005 by The OGRE Team
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This work is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.
Last modified Thu Dec 27 15:19:30 2007