如何对从数组中获取并显示在屏幕上的精灵执行拖放操作? [英] How to perform drag and drop operation on sprite fetched from array and present on screen ?

问题描述

我想在这些图像上执行拖放操作.

I want to perform drag and drop operation on these image.

如何通过以下代码实现这一目标.

How can i make it possible with the following code.

void storeLocation::changescene()
{

this->removeAllChildren();
//CCDirector::sharedDirector()->replaceScene(storeLocation::scene());

CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();
CCPoint origin = CCDirector::sharedDirector()->getVisibleOrigin();

//CCScene* scene=CCScene::create();
    storeLocation *layer = storeLocation::create();
    CCSprite *k=CCSprite::create("background.png");
    this->addChild(k,0);
    k->setPosition(ccp(visibleSize.width/2+ origin.x, visibleSize.height/2 + origin.y));
    CCMenuItemImage *pCloseItem = CCMenuItemImage::create(
                                    "CloseNormal.png",
                                    "CloseSelected.png",
                                    this,
                                    menu_selector(storeLocation::menuCloseCallback));

pCloseItem->setPosition(ccp(origin.x + visibleSize.width - pCloseItem->getContentSize().width ,
                            origin.y + pCloseItem->getContentSize().height/2));
pCloseItem->setScale(1.5);
// create menu, it's an autorelease object
CCMenu* pMenu = CCMenu::create(pCloseItem, NULL);
pMenu->setPosition(CCPointZero);
this->addChild(pMenu, 1);

        this->addChild(pMenu, 1);
        this->setTouchEnabled(true);











int l=5;
int posx=0,posy=0;


int count=0,r,j=-1,i=0,flag=0;
int x=20;
int b[30],a[30];
while(count<=5)
{
    srand(time(0));

    r=rand()%x+1;
    flag=checktag(b,r,j);
    if(flag==1)
    {


    b[i]=r;
    i++;
    count++;
    j++;

    }

}

            int t;


CCObject* jt=NULL;

CCARRAY_FOREACH(images, jt)
    {
           // CCSize winSize = CCDirector::sharedDirector()->getWinSize();
            //float i=winSize.width;

        CCSprite *image = dynamic_cast<CCSprite*>(jt);
        t=image->getTag();
        for(i=0;i<l;i++)
        {
            if(t==b[i])
            {
                this->addChild(image);
        image->setPosition(ccp(100+posx,100));
        posx=posx+120;


            }}}

推荐答案

要将图像从一个点拖放到屏幕上的另一点，您必须使用触摸委托方法

To drag and drop images from one point to another on screen you have to use touch delegate methods

bool ccTouchBegan(cocos2d::CCTouch *pTouch, cocos2d::CCEvent *pEvent);
void ccTouchMoved(cocos2d::CCTouch *pTouch, cocos2d::CCEvent *pEvent);
void ccTouchEnded(cocos2d::CCTouch *pTouch, cocos2d::CCEvent *pEvent);

使用ccTouchBegan方法在用户触摸时检测图像，为此，您可以将所有图像对象存储在数组中，并通过使用for循环来检查触摸是否在任何图像的正上方.

Detect image on user touch in ccTouchBegan method, for this you can store all image objects in a array and check if touch is in rect of any image by using for loop.

要在ccTouchMoved中通过用户触摸更改触摸图像的位置(将触摸图像对象保存在全局对象中)来移动图像.

To move the image with user touch change position of touched image(save touched image object in a global object) in ccTouchMoved.

然后在ccTouchEnded方法中执行删除图像时想要做的任何事情.

And in ccTouchEnded method do whatever you want to do on droping image.

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