现在的位置: 首页 > 综合 > 正文

cocos2d-X CCsprite点击问题

2014年08月29日 ⁄ 综合 ⁄ 共 2889字 ⁄ 字号 评论关闭

cocos2d-x CCLayer上精灵的点击判断的问题

今天发现的问题,记录下,对cocos2d坐标转换的理解还不透彻,看来有必要去学习下OpenGL的基础知识了。

//使用的2dx是老版本.

1. 平时在CCLayer上放置的CCSprite,判断是否被点击到的,我一般这样做:

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
//on
"init" you need to initialize your instance
bool HelloWorld::init()
{
    bool bRet
=
false;
    do
    {
        CC_BREAK_IF(!
CCLayer::init());
         
        //Get
window size.
        CCSize
size = CCDirector::sharedDirector()->getWinSize();
         
        //pSprite
is a CCSprite for test.
        pSprite
= CCSprite::spriteWithFile(
"fjut.png");
        CC_BREAK_IF(!
pSprite);
         
        //Place
the sprite on the center of the screen 
        pSprite->setPosition(ccp(size.width/2,
size.height/2));
         
        this->addChild(pSprite,
0);
        bRet
=
true;
    }while (0);
     
    this->setIsTouchEnabled(true);
    return bRet;
}
void HelloWorld::registerWithTouchDispatcher()
{
    CCTouchDispatcher::sharedDispatcher()->addTargetedDelegate(this,
-1988,
true);
}
 
static CCRect
getRect(CCNode* pNode)
{
    CCRect
rc;
    rc.origin
= pNode->getPosition();
    rc.size
= pNode->getContentSize();
    rc.origin.x
-= rc.size.width*0.5;
    rc.origin.y
-= rc.size.height*0.5;
    return rc;
}
 
void HelloWorld::ccTouchEnded(CCTouch*
pTouch, CCEvent* event)
{
    CCPoint
touchLocation = convertTouchToNodeSpace(pTouch);
    if(CCRect::CCRectContainsPoint(getRect(pSprite),
touchLocation))
    {
        printf("我被点中了!\n");
    }
}
 
bool HelloWorld::ccTouchBegan(CCTouch*
touch, CCEvent* event)
{
    return true;
}

2. 要是在CCLayer1上放置CCLayer2(有偏移),再向CCLayer2上放置CCSprite的点击判断需要计算偏移量:

eg:

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
//on
"init" you need to initialize your instance
bool HelloWorld::init()
{
    bool bRet
=
false;
    do
    {
        CC_BREAK_IF(!
CCLayer::init());
        bRet
=
true;
    }while (0);
     
    this->setIsTouchEnabled(true);
     
    this->testLayer();
     
    return bRet;
}
 
void HelloWorld::testLayer()
{
    CCLayer*
ly = CCLayer::node();
    /*x,
y轴各偏移100*/
    ly->setPosition(ccp(100,
100));
?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
    //layer2
add to layer1
    this->addChild(ly);
 
    pSprite
= CCSprite::spriteWithFile(
"fjut.png");
    pSprite->setPosition(ccp(20,
20));
    ly->addChild(pSprite,
0);
}
 
void HelloWorld::registerWithTouchDispatcher()
{
    CCTouchDispatcher::sharedDispatcher()->addTargetedDelegate(this,
-1988,
true);
}
 
static CCRect
getRect(CCNode* pNode)
{
    CCRect
rc;
    rc.origin
= pNode->getPosition();
    rc.size
= pNode->getContentSize();
    /*x,
y轴各偏移100*/
    rc.origin.x
-= rc.size.width*0.5 - 100;
//!!!!
    rc.origin.y
-= rc.size.height*0.5 - 100;
//!!!!
    return rc;
}
 
void HelloWorld::ccTouchEnded(CCTouch*
pTouch, CCEvent* event)
{
    CCPoint
touchLocation = convertTouchToNodeSpace(pTouch);
    if(CCRect::CCRectContainsPoint(getRect(pSprite),
touchLocation))
    {
        printf("我被点中了!\n");
    }
}
 
bool HelloWorld::ccTouchBegan(CCTouch*
touch, CCEvent* event)
{
    return true;
}
毛毛虫原创,转载请注明出处:http://www.cnblogs.com/fjut/
【上篇】
【下篇】

抱歉!评论已关闭.