Cocos2d-x游戏开发之计时器

首先写一个计时器的头文件GameTimer.h：

#ifndef _GAME_TIMER_H_ #define _GAME_TIMER_H_

#include "cocos2d.h"

class GameTimer : public cocos2d::Node { public:  GameTimer();

 virtual ~GameTimer();

 static GameTimer* createTimer(float time);

 void update(float delta);

 bool init(float time);

 void stop();

 float getTime();

private:  cocos2d::LabelTTF* label;  float pTime; };

#endif

GameTimer.cpp如下：

#include "GameTimer.h"

USING_NS_CC;

GameTimer::GameTimer() {

}

GameTimer::~GameTimer() {

}

bool GameTimer::init(float time) {

 pTime = time;

 label = LabelTTF::create();

label->setPosition(ccp(130, 610));  

 this->addChild(label);

 schedule(schedule_selector(GameTimer::update));

 return true; }

void GameTimer::stop() {

 this->unschedule(schedule_selector(GameTimer::update));

}

float GameTimer::getTime() {

 return pTime;

}

void GameTimer::update(float delta) {

 pTime -= delta;  

 char* mtime = new char[10];  

 //此处只是显示分钟数和秒数  自己可以定义输出时间格式

 sprintf(mtime, "%02d : %02d", (int)pTime / 60, (int)pTime % 60);

 label->setString(mtime);

 label->setFontSize(30);

 label->setColor(Color3B(0, 0, 0));

}

GameTimer* GameTimer::createTimer(float time) {

 GameTimer* gametimer = new GameTimer;

 if (gametimer && gametimer->init(time))  {

  gametimer->autorelease();   return gametimer;

 }

 else  {

  delete gametimer;   gametimer = NULL;

 }

 return NULL;

}

在MyGame.h中声明：

头文件#include "GameTimer.h"

函数void Updatetime(float t);//该函数用于让计时器停止计时

MyGame.cpp:

#include "MyGame.h"

#include "cocostudio/CocoStudio.h"

#include "ui/CocosGUI.h"

#include "cocos2d.h"

#include "GameTimer.h"

#include<iostream>

#include<stdio.h>

using namespace std;

USING_NS_CC;

using namespace cocos2d;

using namespace cocostudio::timeline;

Scene* MyGame::createScene() {

 // 'scene' is an autorelease object

 auto scene = Scene::create();

 // 'layer' is an autorelease object  

auto layer = MyGame::create();

 // add layer as a child to scene  scene->addChild(layer);

 // return the scene  return scene;

}

bool MyGame::init()
{
 //////////////////////////////
 // 1. super init first
 if (!Layer::init())
 {
  return false;
 }

//创建计时器

 m_timeCounter = GameTimer::createTimer(61);  this->addChild(m_timeCounter);

 //开始计时

 m_timeCounter->init(61);

 this->schedule(schedule_selector(MyGame::Updatetime));

// 创建背景图片
 auto dirt = Sprite::create("scene.png");
 dirt->setScaleX(0.75);
 dirt->setScaleY(0.803);
 dirt->setAnchorPoint(Vec2::ZERO);
 dirt->setPosition(0, 0);
 this->addChild(dirt, -2);

.....................

return true;
}

//Updatetime函数

void MyGame::Updatetime(float t)//超过60秒，让时间暂停
{
 if (m_timeCounter->getTime() <= 0) m_timeCounter->stop();
}

运行结果如下：