1.04 锚点

#ifndef _T01LayerAnchorPoint_H_ 
#define _T01LayerAnchorPoint_H_
#include "cocos2d.h"
USING_NS_CC;
//锚点
class T01LayerAnchorPoint:public CCLayer  
{
public:
  static T01LayerAnchorPoint* create( );
  static CCScene* scene( );
  bool init( );
  virtual void draw( );
  virtual void mySchedule( float dt );
private:
  CCSprite* spr;//定时器需要
};
#endif 

#include "T01LayerAnchorPoint.h"
CCScene* T01LayerAnchorPoint::scene( )
{
  CCScene* scene = CCScene::create( );
  T01LayerAnchorPoint* layer = T01LayerAnchorPoint::create( );
  //通常情况下，Scene 是忽略锚点的
  //layer->ignoreAnchorPointForPosition( false ); //不忽略锚点
  //CCLog( "x = %f, y = %f", layer->getPositionX( ), layer->getPositionY( ) );
  scene->addChild( layer );
  return scene;
}
T01LayerAnchorPoint* T01LayerAnchorPoint::create( )
{
  T01LayerAnchorPoint* pRet = new T01LayerAnchorPoint;
  if (pRet && pRet->init())
  {
    pRet->autorelease( );
  }
  else
  {
    delete pRet;
    pRet = NULL;
  }
  return pRet;
}
bool T01LayerAnchorPoint::init( )
{
  CCLayer::init( ); //父类初始化
  //主战场
  CCSize winSize = CCDirector::sharedDirector( )->getWinSize( );
  spr = CCSprite::create( "anchor3.png" );
  //锚点影响 放置位置 
  //spr->setAnchorPoint( ccp( 0, 0 ) );
  spr->setAnchorPoint( ccp( 0, 1 ) );
  //spr->setAnchorPoint( ccp( 1, 0 ) );
  //spr->setAnchorPoint( ccp( 1, 1 ) );
  //锚点影响 缩放 --- 缩放是围绕锚点旋转的
  //spr->setAnchorPoint( ccp( 0.5, 0.5 ) );
  //spr->setAnchorPoint( ccp( 0.656, 0.5 ) );
  //spr->setScale( 5.0f ); //缩放
  //忽略锚点 --- 将锚点置成 0,0
  spr->ignoreAnchorPointForPosition( false );
  spr->setPosition( ccp( winSize.width / 2, winSize.height / 2 ) );
  this->addChild( spr );
  //锚点影响 旋转 --- 通常情况下，旋转是围绕锚点进行
  //定时器
  //typedef void (CCObject::*SEL_SCHEDULE)(float);
  //schedule( schedule_selector(T01LayerAnchorPoint::mySchedule ), 2 ); //2秒钟触发 
  return true;
}
void T01LayerAnchorPoint::draw( )
{
  //draw 绘图
  CCSize winSize = CCDirector::sharedDirector( )->getWinSize( );
  ccDrawColor4B( 255, 0, 0, 255 );
  ccDrawLine( ccp( 0, winSize.height / 2 ), ccp( winSize.width, winSize.height/2) );
  ccDrawLine( ccp( winSize.width / 2, 0 ), ccp( winSize.width/2 , winSize.height) );
}
void T01LayerAnchorPoint::mySchedule( float dt )
{
  static float ro = 0;
  ro += 30;
  spr->setRotation( ro );
}