3.2 Joystick 摇杆控件

******************************** Joystick.h **************************** 
#ifndef __Joystick__
#define __Joystick__

#include "cocos2d.h"
USING_NS_CC;

enum JoystickEnum
{
    DEFAULT,
    D_UP,
    D_DOWN,
    D_LEFT,
    D_RIGHT,
    D_LEFT_UP,
    D_LEFT_DOWN,
    D_RIGHT_UP,
    D_RIGHT_DOWN
};

class Joystick : public Layer
{
public:
    /** ���u杆器 */
    void onRun();
    /** 清除��� */
    void onDisable();
    /** �O置死亡半�剑�即超出半��⒁「似魇�效 */
    void setDieRadius(float radius);
    /** �O置�o效�^域半�剑ㄈ绻�在�o效�^域�龋��⒅刂茫� */
    void setFailRadius(float radius);
    /** 是否�@示底�P和�|�c */
    void setVisibleJoystick(bool visible);
    /** 是否自由��Q�u杆器的位置，即在屏幕上每一次按下鼠��r的座��⑹�u杆器的座�耍�移��r�⒉桓淖��u杆器座�耍�直到下次按下鼠�� */
    void setAutoPosition(bool value);
    /** 回�{函�抵羔� */
    std::function<void(JoystickEnum)> onDirection;
    /** �o�B��建函�担ㄐ枰��魅氲妆P和�|�c�D片路�剑� */
    static Joystick* create(std::string chassisPath,std::string dotPath);
    /** 初始化�u杆器（需要�魅氲妆P和�|�c�D片路�剑� */
    void initWithJoystick(std::string chassisPath,std::string dotPath);
protected:
    /** 有效�^域半�� */
    float _radius;
    /** 失效�^域半�� */
    float _failradius;
    /** 是否移出有效�^域 */
    bool isMoveOut;
    /** 是否存在有效�^域半�� */
    bool isDieRadius;
    /** 是否自由��Q�u杆器座�� */
    bool isAutoPosition;
    /** 方向 */
    JoystickEnum _direction;
    /** 底�P */
    Sprite* _chassis;
    /** �|�c */
    Sprite* _touchDot;
    //*定义一个监听对象*/
    EventListenerTouchOneByOne* listener;
    
    bool onTouchBegan(Touch* touch,Event* event);
    void onTouchMoved(Touch* touch,Event* event);
    void onTouchEnded(Touch* touch,Event* event);
    /** 
    1、�O置�|�c，并判�嗍欠裨�o效�^域�龋ㄈ绻�在�o效�^域�龋��⒅刂茫�
    2、�l送角度�化（如果不在�o效�^域�龋� */
    void setTouchDotPosition(Vec2 vec1,Vec2 vec2);
    /** 
    1、�算�u杆器八方向
    2、�l送角度�化，回�{弧度�化函�� */
    void changeAngle( Vec2 position );
    /** 回�{�]�缘谋O�函�� */
    void callDirectionFun();
    /** 重置（��弧度不是 DEFAULT�r才重置） */
    void resetState();
    
};

#endif
***********************   Joystick.cpp   ******************************
#include "Joystick.h"
/** �o�B��建函�担ㄐ枰��魅氲妆P和�|�c�D片路�剑� */
Joystick* Joystick::create(std::string chassisPath,std::string dotPath)
{
    auto joystick = new Joystick();/*创建一个对象*/
    joystick->initWithJoystick(chassisPath,dotPath);/*调用初始化函数*/
    return joystick;/*返回对象*/
}
/** 初始化�u杆器（需要�魅氲妆P和�|�c�D片路�剑� */
void Joystick::initWithJoystick(std::string chassisPath,std::string dotPath)
{
    _chassis = Sprite::create(chassisPath);/** 底�P */
    this->addChild(_chassis,0);
    _touchDot = Sprite::create(dotPath);/** �|�c */
    this->addChild(_touchDot,1);

    isDieRadius = false;/** 是否存在有效�^域半�� */
    isAutoPosition = false;/** 是否自由��Q�u杆器座�� */
    isMoveOut = false;/** 是否移出有效�^域 */
    _direction = DEFAULT;/*方向默认不动*/
}
/** ���u杆器 */
void Joystick::onRun()
{
    listener = EventListenerTouchOneByOne::create();
    listener->setSwallowTouches(false);
    listener->onTouchBegan = CC_CALLBACK_2(Joystick::onTouchBegan,this);
    listener->onTouchMoved = CC_CALLBACK_2(Joystick::onTouchMoved,this);
    listener->onTouchEnded = CC_CALLBACK_2(Joystick::onTouchEnded,this);
    this->_eventDispatcher->addEventListenerWithSceneGraphPriority(listener,this);
}

bool Joystick::onTouchBegan(Touch* touch,Event* event)
{     /*将触摸点转换为本地坐标  左下角为原点*/
    Vec2 locationInNode = this->convertToNodeSpace(touch->getLocation());
    if( isAutoPosition )
    {
        this->setPosition(touch->getLocation());
        return true;
    }
    if( isAutoPosition==false && isDieRadius )
    {
        if( locationInNode.getLength() > _radius )
        {
            return false;
        }
    }
    _touchDot->setPosition(locationInNode);
    if( locationInNode.getLength() > _failradius )
    {
        changeAngle(locationInNode);
    }
    return true;
}
void Joystick::onTouchMoved(Touch* touch,Event* event)
{
    Vec2 locationInNode = this->convertToNodeSpace(touch->getLocation());
    if( isDieRadius )
    {
        if( locationInNode.getLength() < _radius )
        {
            if( isMoveOut )
            {
                _touchDot->setPosition(locationInNode);
                isMoveOut = false;
            }
            setTouchDotPosition(locationInNode,_touchDot->getPosition() + touch->getDelta());
            return;
        }
    }
    else
    {
        setTouchDotPosition(locationInNode,_touchDot->getPosition() + touch->getDelta());
        return;
    }
    
    isMoveOut = true;
    _touchDot->setPosition(0,0);
    resetState();
}
void Joystick::onTouchEnded(Touch* touch,Event* event)
{
    _touchDot->setPosition(0,0);
    isMoveOut = false;
    resetState();
}

void Joystick::setTouchDotPosition(Vec2 vec1,Vec2 vec2)
{
    _touchDot->setPosition(vec2);
    if( _failradius>0 )
    {
        if( vec1.getLength() < _failradius )
        {
            resetState();
            return;
        }
    }
    changeAngle(vec1);
}
 /** �O置死亡半�剑�即超出半��⒁「似魇�效 */
void Joystick::setDieRadius(float radius)
{
    _radius = radius;
    isDieRadius = true;
}

void Joystick::setAutoPosition(bool value)
{
    isAutoPosition = value;
}
 /** �O置�o效�^域半�剑ㄈ绻�在�o效�^域�龋��⒅刂茫� */
void Joystick::setFailRadius(float radius)
{
    _failradius = radius;
}
/** 清除��� */
void Joystick::onDisable()
{
    this->_eventDispatcher->removeEventListener(listener);
    isDieRadius = false;
    isAutoPosition = false;
    isMoveOut = false;
}

void Joystick::changeAngle( Vec2 position )
{
    auto angle = CC_RADIANS_TO_DEGREES(position.getAngle());
    if(angle > -22.5 && angle < 22.5)
    {
        _direction=D_RIGHT;
    }
    else if(angle > 22.5 && angle < 67.5)
    {
        _direction=D_RIGHT_UP;
    }
    else if(angle > 67.5 && angle < 112.5)
    {
        _direction=D_UP;
    }
    else if(angle > 112.5 && angle < 157.5)
    {
        _direction=D_LEFT_UP;
    }
    else if((angle > 157.5 && angle < 180)||(angle < -157.5 && angle > -180))
    {
        _direction=D_LEFT;
    }
    else if(angle < -112.5 && angle > -157.5)
    {
        _direction=D_LEFT_DOWN;
    }
    else if(angle < -67.5 && angle > -112.5)
    {
        _direction=D_DOWN;
    }
    else if(angle < -22.5 && angle > -67.5)
    {
        _direction=D_RIGHT_DOWN;
    }
    callDirectionFun();
}

void Joystick::callDirectionFun()
{
    if( onDirection )
    {
        onDirection(_direction);
    }
}

void Joystick::resetState()
{
    if(_direction != DEFAULT)
    {
        _direction = DEFAULT;
        callDirectionFun();
    }
}
/** 是否�@示底�P和�|�c */
void Joystick::setVisibleJoystick(bool visible)
{
    _chassis->setVisible(visible);
    _touchDot->setVisible(visible);
}

在  HelloWord.h中   加个 void update(float dt);
在  HelloWord.cpp中
void HelloWorld::update(float dt)
{/* D_UP,
 D_DOWN,
 D_LEFT,
 D_RIGHT,
 D_LEFT_UP,
 D_LEFT_DOWN,
 D_RIGHT_UP,
 D_RIGHT_DOWN*/
    switch (j->getDirection())
    {
    case 1:
        log("D_UP");
        break;
    case 2:
        log("D_DOWN");

        break;
    case 3:
        log("D_LEFT");
        break;
    case 4:
        log("D_RIGHT");
        break;
    case 5:
        log("D_LEFT_UP");
        break;
    case 6:
        log("D_LEFT_DOWN");
        break;
    case 7:
        log("D_RIGHT_UP");
        break;
    case 8:
        log("D_RIGHT_DOWN");
        break;
    default:
        log("stop");
        break;
    }
}
之后调用检检摇杆**********************************

在  HelloWord中调用Joystick
*******************************************************************
普通模式
auto joystick = Joystick::create("rocker.png","rocker_joy.png");//通�^����D片初始化控件
    this->addChild(joystick);
    joystick->setPosition(VisibleRect::leftBottom()+Vec2(200,200));//�O置初始位置　　joystick->onDirection=CC_CALLBACK_1(SceneMain::onDirection,this);//角度�化更新（onDirection(JoystickEnum enums)）
    joystick->onRun();//���
****************************************************************
存在死亡半�侥Ｊ剑海ǔ�出死亡半��⒂|�c重置初始位置，移�邮�效）
auto joystick = Joystick::create("rocker.png","rocker_joy.png");//通�^����D片初始化控件this->addChild(joystick);
joystick->setPosition(VisibleRect::leftBottom()+Vec2(200,200));//�O置初始位置
joystick->setDieRadius(60);//�O置死亡半�剑ㄍ馊Γ�
joystick->onDirection=CC_CALLBACK_1(SceneMain::onDirection,this);//角度�化更新（onDirection(JoystickEnum enums)）
joystick->onRun();//���
*******************************************************************
�O置失效半�剑海ㄔ谑�效半���⒉���|�l角度改�事件）
auto joystick = Joystick::create("rocker.png","rocker_joy.png");//通�^����D片初始化控件
this->addChild(joystick);
joystick->setPosition(VisibleRect::leftBottom()+Vec2(200,200));//�O置初始位置
joystick->setDieRadius(60);//�O置死亡半�剑ㄍ馊Γ�
joystick->setFailRadius(30);//�O置失效半�剑�热Γ� 
joystick->onDirection=CC_CALLBACK_1(SceneMain::onDirection,this);//角度�化更新（onDirection(JoystickEnum enums)）
joystick->onRun();//���
*-****************************************************************
�O置自由��Q位置：以鼠�税聪碌淖���槌跏嘉恢�
auto joystick = Joystick::create("rocker.png","rocker_joy.png");//通�^����D片初始化控件
this->addChild(joystick);
joystick->setPosition(VisibleRect::leftBottom()+Vec2(200,200));//�O置初始位置
joystick->setAutoPosition(true);//是否自由改�座��
joystick->onDirection=CC_CALLBACK_1(SceneMain::onDirection,this);//角度�化更新
joystick->onRun();//���
*********************************************************************
�O置�[藏�u杆：（不�@示�u杆底�P和�|�c，一般���O置成自由改�位置）
auto joystick = Joystick::create("rocker.png","rocker_joy.png");//通�^����D片初始化控件
this->addChild(joystick);
joystick->setPosition(VisibleRect::leftBottom()+Vec2(200,200));//�O置初始位置
joystick->setAutoPosition(true);//是否自由改�座��
joystick->setVisibleJoystick(false);//是否�@示
joystick->onDirection=CC_CALLBACK_1(SceneMain::onDirection,this);//角度�化更新
joystick->onRun();//���