animationblender.cpp

DirectX群共享的好东西啊 ！ 希望能对你有帮助

#include "AnimationBlender.h"

void AnimationBlender::init(const String &animation)
{
	//初始化所有动作的AnimationState
	AnimationStateSet *set = mEntity->getAllAnimationStates();
	AnimationStateIterator it = set->getAnimationStateIterator();
	while(it.hasMoreElements())
	{
		AnimationState *anim = it.getNext();
		anim->setEnabled(false);
		anim->setWeight(0);
		anim->setTimePosition(0);
	}
	//初始化mSource
	mSource = mEntity->getAnimationState( animation );
	mSource->setEnabled(true);
	mSource->setWeight(1);
	mTimeleft = 0;
	mDuration = 1;
	mTarget = 0;
	complete=false;
} 
void AnimationBlender::blend( const String &animation, BlendingTransition transition, Real duration, bool l )
{
	loop=l;	//设置是否需要循环
	if( transition == AnimationBlender::BlendSwitch )
	{//如果混合方式为直接切换，改变mSource 即可
		if( mSource != 0 )
			mSource->setEnabled(false);
		mSource = mEntity->getAnimationState( animation );
		mSource->setEnabled(true);
		mSource->setWeight(1);
		mSource->setTimePosition(0);
		mTimeleft = 0;
	} 
	else 
	{ 
		//先取得新的动画状态
		AnimationState *newTarget = mEntity->getAnimationState( animation );
		if( mTimeleft > 0 ) //前一次的混合尚未结束
		{
			if( newTarget == mTarget )
			{
				// 新的目标就是正在混合中的目标，什么也不做
			}
			else if( newTarget == mSource )
			{
				// 新的目标是源动画，直接go back
				mSource = mTarget;
				mTarget = newTarget;
				mTimeleft = mDuration - mTimeleft; 
			}
			else
			{
				// 现在newTarget是真的新的动画了
				if( mTimeleft < mDuration * 0.5 )	//上一次的混合进度还未超过一半
				{
					// 简单替换Target就行了
					mTarget->setEnabled(false);
					mTarget->setWeight(0);
				}
				else	//如果已经过半，旧的target成为新的source
				{
					
					mSource->setEnabled(false);
					mSource->setWeight(0);
					mSource = mTarget;
				} 
				mTarget = newTarget;
				mTarget->setEnabled(true);
				mTarget->setWeight( 1.0 - mTimeleft / mDuration );
				mTarget->setTimePosition(0);
			}
		}
		else	//上次的混合已经结束，当前未处于混合状态中
		{
			mTransition = transition;
			mTimeleft = mDuration = duration;
			mTarget = newTarget;
			mTarget->setEnabled(true);
			mTarget->setWeight(0);
			mTarget->setTimePosition(0);
		}
	}
}
void AnimationBlender::addTime( Real time )
{
	if( mSource != 0 )	//若无AnimationState则不进行操作
	{
		if( mTimeleft > 0 )	//两个动画仍在混合过程中
		{
			mTimeleft -= time;	
			if( mTimeleft < 0 )
			{
				// 混合完毕,切换到目标动画
				mSource->setEnabled(false);
				mSource->setWeight(0);
				mSource = mTarget;
				mSource->setEnabled(true);
				mSource->setWeight(1);
				mTarget = 0;
			}
			else
			{
				// 仍然处于混合状态中，改变两个动画的权值
				mSource->setWeight(mTimeleft / mDuration);
				mTarget->setWeight(1.0 - mTimeleft / mDuration);
				//在这种混合方式下，需要为目标动画增加时间
				if(mTransition == AnimationBlender::BlendWhileAnimating)
					mTarget->addTime(time);
			}
		}
		if (mSource->getTimePosition() >= mSource->getLength())
		{
			complete=true;
		}
		else
		{
			complete=false;
		}
		mSource->addTime(time);
		mSource->setLoop(loop);
	}
}
AnimationBlender::AnimationBlender( Entity *entity ) : mEntity(entity){}