CCMotionStreak（一）

void MotionStreakTest1::onEnter()

{

    MotionStreakTest::onEnter();



    CCSize s = CCDirector::sharedDirector()->getWinSize();

  

    // the root object just rotates around

    m_root = CCSprite::create(s_pPathR1);

    addChild(m_root, 1);

    m_root->setPosition(ccp(s.width/2, s.height/2));

  

    // the target object is offset from root, and the streak is moved to follow it

    m_target = CCSprite::create(s_pPathR1);

    m_root->addChild(m_target);

    m_target->setPosition(ccp(s.width/4, 0));



    // create the streak object and add it to the scene

    streak = CCMotionStreak::create(2, 3, 32, ccGREEN, s_streak);

    addChild(streak);

    // schedule an update on each frame so we can syncronize the streak with the target

    schedule(schedule_selector(MotionStreakTest1::onUpdate));

  

    CCActionInterval* a1 = CCRotateBy::create(2, 360);



    CCAction* action1 = CCRepeatForever::create(a1);

    CCActionInterval* motion = CCMoveBy::create(2, ccp(100,0) );

    m_root->runAction( CCRepeatForever::create((CCActionInterval*)(CCSequence::create(motion, motion->reverse(), NULL)) ) );

    m_root->runAction( action1 );

//最后的颜色会跟背景色一致，这样就达到逐渐消失的效果

    CCActionInterval *colorAction = CCRepeatForever::create((CCActionInterval *)CCSequence::create(

        CCTintTo::create(0.2f, 255, 0, 0),

        CCTintTo::create(0.2f, 0, 255, 0),

        CCTintTo::create(0.2f, 0, 0, 255),

        CCTintTo::create(0.2f, 0, 255, 255),

        CCTintTo::create(0.2f, 255, 255, 0),

        CCTintTo::create(0.2f, 255, 0, 255),

        CCTintTo::create(0.2f, 255, 255, 255),

        NULL));



    streak->runAction(colorAction);

}



void MotionStreakTest1::onUpdate(float delta)

{

//先获取精灵m_target左上角的坐标，然后赋值给streak,m_target的坐标一直在变化

    streak->setPosition( m_target->convertToWorldSpace(CCPointZero) );

}