cocos2d-x 3.2 |飞机大战:背景与滚动

五篇介绍飞机大战实现过程 

cocos2d-x 3.2 |飞机大战:背景与滚动

前情提要第一篇：背景与滚动

如下： 新建项目---->类----->BackGround

BackGround.h

#include <stdio.h>
#include "cocos2d.h"
using namespace cocos2d;
class BackGround:public Node
{
public:
    CREATE_FUNC(BackGround);
    //create方法会调用init
    bool init();
    void update(float t);
    int count;
};

BackGround.cpp

#include "BackGround.h"
#include "cocos2d.h"
using namespace cocos2d;

bool BackGround::init()
{
    if (!Node::init()) {
        return false;
    }
    //添加背景图片
    auto Gamebk=Sprite::create("xxxx.jpg");
    Gamebk->setTag(10);
    //设定背景层锚点 坐标 并添加到当前场景
    Gamebk->setAnchorPoint(Vec2(0,0));
    Gamebk->setPosition(Vec2(0,0));
    this->addChild(Gamebk);
    //添加滚动背景层 锚点 坐标 添加到当前场景 标签
    auto Gamebk1=Sprite::create("xxxx.jpg");
    Gamebk1->setAnchorPoint(Vec2(0,0));
    Gamebk1->setPosition(Vec2(0,0));
    this->addChild(Gamebk1);
    Gamebk1->setTag(11);
    

    //计划任务:滚动贴图
    this->scheduleUpdate();
    
    //添加云彩图片
    auto Clouds=Sprite::create("xxxxx.png");
    Clouds->setScale(0.3, 0.3);
    this->addChild(Clouds);
    Clouds->setTag(13);
    Clouds->setAnchorPoint(Vec2::ZERO);
    //随机生成云彩位置
    int px=rand()%(int)Director::getInstance()->getWinSize().width;
    int py=rand()%(int)Clouds->getContentSize().height+Director::getInstance()->getWinSize().height;
    //CCLOG("%d %d ",px,py);
    Clouds->setPosition(px, py);
    count=0;
    return true;
}
void BackGround::update(float t)
{
    //移动云彩逻辑
    count=count+1;
    if (count>1)
    {
        auto Clouds=this->getChildByTag(13);
        Clouds->setPositionY(Clouds->getPositionY()-2);

        if (Clouds->getPositionY()<-Clouds->getContentSize().height)
        {
//            Clouds->setPositionY(
//                Director::getInstance()->getWinSize().height+Clouds->getContentSize().height);
            int px=rand()%(int)Director::getInstance()->getWinSize().width;
            int py=rand()%(int)Clouds->getContentSize().height+Director::getInstance()->getWinSize().height;
            Clouds->setPosition(px, py);
        }
    }
    //移动背景逻辑
    auto Gamebk=this->getChildByTag(10);
    auto Gamebk1=this->getChildByTag(11);
    
    Gamebk->setPositionY(Gamebk->getPositionY()-1);
    Gamebk1->setPositionY(Gamebk->getPositionY()+Gamebk->getContentSize().height);
    if (Gamebk1->getPositionY()<=0)
    {
        Gamebk->setPositionY(Gamebk1->getPositionY());
    }
}

总结：实现了背景、背景滚动、云彩、云彩随机出生+移动。