cocos2d-x游戏开发系列教程-坦克大战游戏之虚拟手柄的显示

上篇文章我们有了坦克，但是没有手柄，无法控制坦克。

1.这篇我们编写虚拟手柄来控制坦克。头文件大致内容如下：

[cpp] view
plaincopy





#define RES_PADDLE_LEFT "paddle/left.png"

#define RES_PADDLE_LEFT_PRESS "paddle/left_press.png"

#define RES_PADDLE_RIGHT "paddle/right.png"

#define RES_PADDLE_RIGHT_PRESS "paddle/right_press.png"

#define RES_PADDLE_UP "paddle/top.png"

#define RES_PADDLE_UP_PRESS "paddle/top_press.png"

#define RES_PADDLE_DOWN "paddle/buttom.png"

#define RES_PADDLE_DOWN_PRESS "paddle/buttom_press.png"

#define RES_PADDLE_FIRE "paddle/fire.png"

#define RES_PADDLE_FIRE_PRESS "paddle/fire_press.png"

class Panel : public CCLayer

{

public:

virtual bool init();

CREATE_FUNC(Panel);

protected:

Paddle* m_pPaddleUp;

Paddle* m_pPaddleDown;

Paddle* m_pPaddleLeft;

Paddle* m_pPaddleRight;

Paddle* m_pPaddleFire;

};

上面定义了上下左右按钮的图片，还记得我们写关卡选择按钮的Paddle吧，

下面定义了五个Paddle分别对应上下左右开火按钮。

2.我们在初始化函数init中，加载按钮图片，然后设置按钮图片对应的坐标。

代码如下：

[cpp] view
plaincopy





bool Panel::init()

{

CCLayer::init();

//加载手柄按钮所需的图片

CCTexture2D* paddleTexture = CCTextureCache::sharedTextureCache()->addImage(RES_PADDLE_UP);

m_pPaddleUp = Paddle::paddleWithTexture(paddleTexture);

paddleTexture = CCTextureCache::sharedTextureCache()->addImage(RES_PADDLE_DOWN);

m_pPaddleDown = Paddle::paddleWithTexture(paddleTexture);

paddleTexture = CCTextureCache::sharedTextureCache()->addImage(RES_PADDLE_LEFT);

m_pPaddleLeft = Paddle::paddleWithTexture(paddleTexture);

paddleTexture = CCTextureCache::sharedTextureCache()->addImage(RES_PADDLE_RIGHT);

m_pPaddleRight = Paddle::paddleWithTexture(paddleTexture);

paddleTexture = CCTextureCache::sharedTextureCache()->addImage(RES_PADDLE_FIRE);

m_pPaddleFire = Paddle::paddleWithTexture(paddleTexture);

CCSize size = getContentSize();

//设置手柄上下左右按钮以及开火按钮的位置

int localX[5] = { size.width*4.5f / 26, size.width*4.5f / 26, size.width*2.3f / 26,

size.width*6.7f / 26, size.width*22.0f / 26 };

int localY[5] = { size.height*6.7 / 26, size.height*2.3 / 26, size.height*4.5f / 26,

size.height*4.5f / 26, size.height*5.0 / 26 };

Paddle* paddle[] = { m_pPaddleUp, m_pPaddleDown, m_pPaddleLeft, m_pPaddleRight, m_pPaddleFire };

for (int i = 0; i<sizeof(paddle) / sizeof(paddle[0]); ++i)

{

addChild(paddle[i]);

paddle[i]->setPosition(ccp(localX[i], localY[i]));

CCSize szPaddle = paddle[i]->getContentSize();

paddle[i]->setScale(size.height * 4.5f / 26 / szPaddle.height);

}

return true;

}

3.最后再写一个函数获取按钮的状态，这样就知道当前按下了那个按钮：

在之前我们定义一组命令，按到那个按钮就返回什么命令：

[cpp] view
plaincopy





enum enumOrder

{

cmdNothing,

cmdGoUP,

cmdGoDown,

cmdGoLeft,

cmdGoRight,

cmdFire

};

4.再添加一个enumOrder getOrder();函数，实现如下：

[cpp] view
plaincopy





enumOrder Panel::getOrder()

{

enumOrder order = cmdNothing;

if (m_pPaddleUp->getstate() == kPaddleStateGrabbed)

order = cmdGoUP;

else if (m_pPaddleDown->getstate() == kPaddleStateGrabbed)

order = cmdGoDown;

else if (m_pPaddleLeft->getstate() == kPaddleStateGrabbed)

order = cmdGoLeft;

else if (m_pPaddleRight->getstate() == kPaddleStateGrabbed)

order = cmdGoRight;

else if (m_pPaddleFire->getstate() == kPaddleStateGrabbed)

order = cmdFire;

return order;

}

5，在ChoiceScene场景中添加成员变量Panel* mLayerPanel;，

然后在 ChoiceScene的init函数下面加上两行代码即可显示虚拟手柄：

[cpp] view
plaincopy





//添加虚拟手柄的显示

mLayerPanel = Panel::create();

addChild(mLayerPanel, 3);

显示效果图如下：

完整代码下载地址：

http://download.csdn.net/detail/yincheng01/6749935