让机器人朝靠近英雄的地方走

void GameLayer::updateRobots(float dt)
{
int alive=0; //当前活着的机器人的数量
int distanceSQ;
int randomChoice=0;
CCObject* pObject=NULL;
CCARRAY_FOREACH(this->_robots,pObject){
Robot* robot=(Robot*)pObject;
if(robot->_actionState != kActionDead){
alive++;
if(::GetCurTime()>robot->_nextDecisionTime){
distanceSQ=ccpDistanceSQ(robot->getPosition(),this->_hero->getPosition());

if(distanceSQ<=50*50){
robot->_nextDecisionTime=::GetCurTime()+frandom_range(0.1,0.5)*1000;
randomChoice=random_range(0,1);

if(randomChoice==0){   //机器人执行攻击动作
if(this->_hero->getPositionX()>robot->getPositionX()){
robot->setScaleX(1.0f);
}else{
robot->setScaleX(-1.0f);
}

robot->_nextDecisionTime=robot->_nextDecisionTime+frandom_range(0.1,0.5)*2000;

robot->attack();

//检测机器人是否攻击到英雄
if(fabsf(this->_hero->getPositionY()-robot->getPositionY())<10){
if(_hero->_hitBox.actual.intersectsRect(robot->_attackBox.actual)){
_hero->hurtWithDamage(robot->_damage);

if(_hero->_actionState==kActionDead && (((GameScene*)(this->getParent()))->_hudLayer->getActionByTag(537)==NULL)){
this->endGame();
}
}
}
}else{   //执行空闲动作
robot->idle();
}
}else if(distanceSQ <= CCDirector::sharedDirector()->getWinSize().width*CCDirector::sharedDirector()->getWinSize().width){
robot->_nextDecisionTime=::GetCurTime()+frandom_range(0.5,1.0)*1000;
randomChoice=random_range(0,2);

if(randomChoice==0){  //机器人执行行走动作
CCPoint moveDirection=ccpNormalize(ccpSub(_hero->getPosition(),robot->getPosition()));  //求标准化向量

robot->walkWithDirection(moveDirection);
robot->updateDesiredPosition(dt*20);
//robot->setPosition(robot->_desiredPosition);

}else{  //执行空闲动作
robot->idle();
}
}
}
}
}

if(alive==0 && ((GameScene*)(this->getParent()))->_hudLayer->getChildByTag(537)==NULL){
this->endGame();
}
}