cocos2d-x 游戏开发之游戏控制器摇杆

头文件：

#ifndef__HROCKER_H__
#define__HROCKER_H__

#include"cocos2d.h"
#include"cocos-ext.h"

USING_NS_CC;
USING_NS_CC_EXT;

//用于标识摇杆与摇杆的背景
typedefenum{
	tag_rocker,tag_rockerBG,}tagForHRocker;
//用于标识摇杆方向
typedefenum{
	rocker_stay,rocker_right,rocker_up,rocker_left,rocker_down,}tagDirecton;
classHRocker:publiccocos2d::Layer
{
public:
	HRocker(void);
	~HRocker(void);

	//创建摇杆(摇杆的操作题图片资源名，摇杆背景图片资源名，起始坐标)
	staticHRocker*createHRocker(constchar*rockerImageName,constchar*rockerBGImageName,Vec2position);
	//启动摇杆(显示摇杆、监听摇杆触屏事件)
	voidstartRocker(bool_isstopOther);
	//停止摇杆(隐藏摇杆，取消摇杆的触屏监听)
	voidstopRocker();
	//判断控制杆方向，用来判断精灵上、下、左、右运动
	introcketDirection;
	//当前人物行走方向,用来判断精灵的朝向，精灵脸朝右还是朝左
	boolrocketRun;

	//触屏事件
	virtualboolonTouchBegan(Touch*pTouch,cocos2d::Event*pEvent);

	virtualvoidonTouchMoved(Touch*pTouch,cocos2d::Event*pEvent);

	virtualvoidonTouchEnded(Touch*pTouch,cocos2d::Event*pEvent);

	CREATE_FUNC(HRocker);
private:
	//自定义初始化函数
	voidrockerInit(constchar*rockerImageName,constVec2position);
	//是否可操作摇杆
	boolisCanMove;
	//获取当前摇杆与用户触屏点的角度
	floatgeTrad(Vec2pos1,Vec2pos2);
	//摇杆背景的坐标
	Vec2rockerBGPosition;
	//摇杆背景的半径
	floatrockerBGR;
};

#endif

源文件：

#include"HRocker.h"
constdoublePI=3.1415;
USING_NS_CC;
HRocker::HRocker(void)
{
	rocketRun=false;
}

HRocker::~HRocker(void)
{
}

//创建摇杆(摇杆的操作题图片资源名，摇杆背景图片资源名，起始坐标)
HRocker*HRocker::createHRocker(constchar*rockerImageName,Vec2position)
{
	HRocker*layer=HRocker::create();
	if(layer)
	{
		layer->rockerInit(rockerImageName,rockerBGImageName,position);
		returnlayer;
	}
	CC_SAFE_DELETE(layer);
	returnNULL;
}

//自定义初始化函数
voidHRocker::rockerInit(constchar*rockerImageName,constVec2position)
{
	Sprite*spRockerBG=Sprite::create(rockerBGImageName);
	spRockerBG->setPosition(position);
	spRockerBG->setVisible(false);
	addChild(spRockerBG,tag_rockerBG);

	Sprite*spRocker=Sprite::create(rockerImageName);
	spRocker->setPosition(position);
	spRocker->setVisible(false);
	addChild(spRocker,1,tag_rocker);

	rockerBGPosition=position;
	rockerBGR=spRockerBG->getContentSize().width*0.5;//
	rocketDirection=-1;//表示摇杆方向不变
}

//启动摇杆(显示摇杆、监听摇杆触屏事件)
voidHRocker::startRocker(bool_isstopOther)
{
	Sprite*rocker=(Sprite*)this->getChildByTag(tag_rocker);
	rocker->setVisible(true);

	Sprite*rockerBG=(Sprite*)this->getChildByTag(tag_rockerBG);
	rockerBG->setVisible(true);

	autodispatcher=Director::getInstance()->getEventdispatcher();
	autotouchListener=EventListenerTouchOneByOne::create();
	TouchListener->onTouchBegan=CC_CALLBACK_2(HRocker::onTouchBegan,this);
	TouchListener->onTouchMoved=CC_CALLBACK_2(HRocker::onTouchMoved,this);
	TouchListener->onTouchEnded=CC_CALLBACK_2(HRocker::onTouchEnded,this);
	TouchListener->setSwallowtouches(true);
	dispatcher->addEventListenerWithSceneGraPHPriority(TouchListener,this);


}

//停止摇杆(隐藏摇杆，取消摇杆的触屏监听)
voidHRocker::stopRocker()
{
	Sprite*rocker=(Sprite*)this->getChildByTag(tag_rocker);
	rocker->setVisible(false);

	Sprite*rockerBG=(Sprite*)this->getChildByTag(tag_rockerBG);
	rockerBG->setVisible(false);

	this->removeChildByTag(tag_rocker);this->removeChildByTag(tag_rockerBG);


}


//获取当前摇杆与用户触屏点的角度
floatHRocker::geTrad(Vec2pos1,Vec2pos2)
{
	floatpx1=pos1.x;
	floatpy1=pos1.y;
	floatpx2=pos2.x;
	floatpy2=pos2.y;

	//得到两点x的距离
	floatx=px2-px1;
	//得到两点y的距离
	floaty=py1-py2;
	//算出斜边长度
	floatxie=sqrt(pow(x,2)+pow(y,2));
	//得到这个角度的余弦值(通过三角函数中的店里：角度余弦值=斜边/斜边)
	floatcosAngle=x/xie;
	//通过反余弦定理获取到期角度的弧度
	floaTrad=acos(cosAngle);
	//注意：当触屏的位置Y坐标<摇杆的Y坐标，我们要去反值-0~-180
	if(py2<py1)
	{
		rad=-rad;
	}
	returnrad;
}

Vec2getAngelePosition(floatr,floatangle){
	returnPoint(r*cos(angle),r*sin(angle));
}

//抬起事件
boolHRocker::onTouchBegan(Touch*pTouch,Event*pEvent)
{
	Vec2Vec2=pTouch->getLocation();
	Sprite*rocker=(Sprite*)this->getChildByTag(tag_rocker);
	if(rocker->getBoundingBox().containsPoint(Vec2))
	{
		isCanMove=true;
		cclOG("begin");
	}
	returntrue;
}
//移动事件
voidHRocker::onTouchMoved(Touch*pTouch,Event*pEvent)
{
	if(!isCanMove)
	{
		return;
	}
	Vec2Vec2=pTouch->getLocation();
	Sprite*rocker=(Sprite*)this->getChildByTag(tag_rocker);
	//得到摇杆与触屏点所形成的角度
	floatangle=geTrad(rockerBGPosition,Vec2);
	//判断两个圆的圆心距是否大于摇杆背景的半径
	if(sqrt(pow((rockerBGPosition.x-Vec2.x),2)+pow((rockerBGPosition.y-Vec2.y),2))>=rockerBGR)
	{

		//保证内部小圆运动的长度限制
		rocker->setPosition(getAngelePosition(rockerBGR,angle)+Point(rockerBGPosition.x,rockerBGPosition.y));
		//	cclOG("touch");
	}
	else
	{
		//当没有超过，让摇杆跟随用户触屏点移动即可
		rocker->setPosition(Vec2);
		//cclOG("touch");
	}

	//判断方向
	if(angle>=-PI/4&&angle<PI/4)
	{
		rocketDirection=rocker_right;
		rocketRun=false;
		cclOG("%d",rocketDirection);
	}
	elseif(angle>=PI/4&&angle<3*PI/4)
	{
		rocketDirection=rocker_up;
		cclOG("%d",rocketDirection);
	}
	elseif((angle>=3*PI/4&&angle<=PI)||(angle>=-PI&&angle<-3*PI/4))
	{
		rocketDirection=rocker_left;
		rocketRun=true;
		cclOG("%d",rocketDirection);
	}
	elseif(angle>=-3*PI/4&&angle<-PI/4)
	{
		rocketDirection=rocker_down;
		cclOG("%d",rocketDirection);
	}
}

//离开事件
voidHRocker::onTouchEnded(Touch*pTouch,Event*pEvent)
{
	if(!isCanMove)
	{
		return;
	}
	Sprite*rockerBG=(Sprite*)this->getChildByTag(tag_rockerBG);
	Sprite*rocker=(Sprite*)this->getChildByTag(tag_rocker);
	rocker->stopAllActions();
	rocker->runAction(Moveto::create(0.08f,rockerBG->getPosition()));
	isCanMove=false;
	rocketDirection=rocker_stay;
	cclOG("%d",rocketDirection);
	cclOG("end");
}

说明：