cocos2d-x的初步学习十八之坦克大战五

这篇文章中，我们将加入如何移动我们的坦克，以前的文章中，我们提到了一种虚拟摇杆，SneakInput。这里，我们将采用SneakInput类来作为我们的虚拟摇杆类。首页，我们新建一个控制层类，ControlLayer，这个类将管理着坦克的控制，OK，下面我们直接上代码：

ControlLayer.h

#include "cocos2d.h"
#include "SneakyJoystick.h"
#include "SneakyJoystickSkinnedBase.h"
#include "MapLayer.h"
#include "TankSprite.h"

class ControlLayer: public cocos2d::CCLayer
{

public:
    
    virtual bool init();
    
    // preprocessor macro for "static create()" constructor ( node() deprecated )
    CREATE_FUNC(ControlLayer);

    MapLayer *_mapLayer;

private:
    
    SneakyJoystick *joystick;
    
    void addJoystick(void);

    void update(float t);
    
    

};

#endif /* defined(__TestTank2dx__ControlLayer__) */

ControlLayer.cpp

#include "ControlLayer.h"
#include "SimpleAudioEngine.h"

using namespace cocos2d;
using namespace CocosDenshion;

bool ControlLayer::init()
{
    //////////////////////////////
    if ( !CCLayer::init())
    {
        return false;
    }
    
    
    this->addJoystick();
    
    //调用系统的刷新函数
    this->scheduleUpdate();
    
    
    return true;
}

void ControlLayer::addJoystick()
{

    
    float joystickRadius = 140;
    
    
    joystick=new SneakyJoystick();
    joystick->autorelease();
    joystick->initWithRect(CCRectZero);
    //是否自动回到中心
    joystick->setAutoCenter(true);
    //是否支持死亡区域，该区域不会触发
    joystick->setHasDeadzone(true);
    //死亡区域半径
    joystick->setDeadRadius(10);
    
    SneakyJoystickSkinnedBase *joystickSkin=new SneakyJoystickSkinnedBase();
    joystickSkin->autorelease();
    joystickSkin->init();
    //背景
    CCSprite *bgSprite=CCSprite::create("control_bg.png");
    bgSprite->setOpacity(100);
    
    joystickSkin->setBackgroundSprite(bgSprite);
    //中心点
    CCSprite *thumbSprite=CCSprite::create("cen.png");
    thumbSprite->setOpacity(100);
    joystickSkin->setThumbSprite(thumbSprite);
    joystickSkin->getThumbSprite()->setScale(1.0f);
    joystickSkin->setPosition(CCPointMake(joystickRadius,joystickRadius));
    joystickSkin->setJoystick(joystick);
    
    this->addChild(joystickSkin);

}

void ControlLayer::update(float t)
{
    
    
    if (_mapLayer==NULL) {
        
        return;
        
        
    }
    
    TankSprite *tank=_mapLayer->_tank1;
    
    if (tank==NULL) {
        
        
        return;
    }
    
    
    
    //  getVelocity()到的数值很小 需要放大
    CCPoint poi = ccpMult(joystick->getVelocity(), 50);
    
    
    
    //right
    if ((poi.x  >  0)  && (poi.x - poi.y) >0 && (poi.x + poi.y) > 0){
        
        tank->moveRight();
        
        
    }
    //left
    else if ( (poi.x < 0)  && (poi.x + poi.y) < 0 &&(poi.x - poi.y) < 0) {
        
        
        tank->moveLeft();
        
    }
    //up
    else if ((poi.y > 0) &&(poi.y - poi.x) > 0 &&(poi.y + poi.x) >0 ){
        
        
        tank->moveUp();

        
        
    }
    //down
    else if ((poi.y < 0) &&(poi.y - poi.x) < 0 && (poi.y + poi.x) < 0) {
        
        
        tank->moveDown();
        
    }
    
    
    
}

对于我们的TankSprite类，我们修改下，增加移动的函数
TankSprite.cpp

void TankSprite::moveUp()
{

    //设置旋转方向
    this->setRotation(0);
    
    kaction=kUp;
    
   // CCPoint tp=this->getPosition();
    

    this->setPosition(ccp(this->getPosition().x, this->getPosition().y+_speed));
    

}

void TankSprite::moveDown()
{

}

void TankSprite::moveLeft()
{

}

void TankSprite::moveRight()
{

}

最后在我们的游戏场景GameScene中，加入控制层，
GameScene.cpp

_conLayer=ControlLayer::create();
    _conLayer->_mapLayer=_mapLayer;
    
    this->addChild(_conLayer, 1);

Ok,就这样简单，然后我们就可以移动我们的tank了～～～～