cocos2d中锚点概念

这两天看了下锚点的概念。

/**

* Sets the anchor point in percent.

*

* anchorPoint is the point around which all transformations and positioning manipulations take place.

* It‘s like a pin in the node where it is "attached" to its parent.

* The anchorPoint is normalized, like a percentage. (0,0) means the bottom-left corner and (1,1) means the top-right corner.

* But you can use values higher than (1,1) and lower than (0,0) too.

* The default anchorPoint is (0.5,0.5), so it starts in the center of the node.

*

* @param anchorPoint   The anchor point of node.

*/

virtual void setAnchorPoint(const CCPoint& anchorPoint);

anchorPoint is the point around which all transformations and positioning manipulations take place.

是为了在定位位置和翻转的时候用的参考点。

CCSprite* sprite5 = CCSprite::create("CloseNormal.png");

sprite5->setAnchorPoint( ccp(0.5,0.5) );

sprite5->setPosition(ccp(origin.x+visibleSize.width/2, origin.y+visibleSize.height/2));

this->addChild(sprite5);

此时 (ccp(origin.x+visibleSize.width/2, origin.y+visibleSize.height/2)) 点正在sprite5的中心点( ccp(0.5,0.5))

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

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

// 右上角

CCSprite* sprite1 = CCSprite::create("CloseSelected1.png");

sprite1->setAnchorPoint( ccp(0,0) );

sprite1->setPosition(ccp(origin.x+visibleSize.width/2, origin.y+visibleSize.height/2));

this->addChild(sprite1);

// 左上角

CCSprite* sprite2 = CCSprite::create("CloseNormal.png");

sprite2->setAnchorPoint( ccp(1,0) );

sprite2->setPosition(ccp(origin.x+visibleSize.width/2, origin.y+visibleSize.height/2));

this->addChild(sprite2);

// 左下角

CCSprite* sprite3 = CCSprite::create("CloseNormal.png");

sprite3->setAnchorPoint( ccp(1,1) );

sprite3->setPosition(ccp(origin.x+visibleSize.width/2, origin.y+visibleSize.height/2));

this->addChild(sprite3);

// 右下角

CCSprite* sprite4 = CCSprite::create("CloseNormal.png");

sprite4->setAnchorPoint( ccp(0,1) );

sprite4->setPosition(ccp(origin.x+visibleSize.width/2, origin.y+visibleSize.height/2));

this->addChild(sprite4);

// 中间

CCSprite* sprite5 = CCSprite::create("CloseNormal.png");

sprite5->setAnchorPoint( ccp(0.5,0.5) );

sprite5->setPosition(ccp(origin.x+visibleSize.width/2, origin.y+visibleSize.height/2));

this->addChild(sprite5);