sprite 根据相对弧度旋转

void MainLayer::ccTouchesEnded(CCSet *pTouches, CCEvent*pEvent)



{



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



    CCSetIterator it = pTouches->begin();



    CCTouch* touch = (CCTouch*)(*it);



       CCPoint location = touch->getLocation();



    CCNode* s = getChildByTag(kTagSprite);



    s->stopAllActions();



    s->runAction( CCMoveTo::create(1, ccp(location.x, location.y) ) );



    CCLog("xx===%f,yy===%f",location.x, location.y);



    CCLog("w===%f,h===%f",size.width, size.height);



    float o = location.x - s->getPosition().x;



    float a = location.y - s->getPosition().y;



     CCLog("w===%f,h===%f",a, o);



    float at = (float) CC_RADIANS_TO_DEGREES( atanf( o/a) );



    CCLog("%f",at);



//    CCLog("%f",fabs(at));



    if( a < 0 )



    {



        if(  o < 0 )



            at = 180 + fabs(at);



        else



            at = 180 - fabs(at);    



    }



    s->runAction( CCRotateTo::create(1, at) );



}