axmol/cocos2dx/tileMap_parallax_nodes/CCParallaxNode.cpp

/****************************************************************************
Copyright (c) 2010 cocos2d-x.org

http://www.cocos2d-x.org

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of this software and associated documentation files (the "Software"), to deal
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****************************************************************************/
#include "CCParallaxNode.h"
#include "CGPointExtension.h"
#include "support/data_support/ccArray.h"

namespace cocos2d {

	class CGPointObject : NSObject
	{
		CCX_SYNTHESIZE(CGPoint, m_tRatio, Ratio)
		CCX_SYNTHESIZE(CGPoint, m_tOffset, Offset)
		CCX_SYNTHESIZE(CCNode *,m_pChild, Child)	// weak ref

		static CGPointObject * pointWithCGPoint(CGPoint ratio, CGPoint offset)
		{
			CGPointObject *pRet = new CGPointObject();
			pRet->initWithCGPoint(ratio, offset);
			pRet->autorelease();
			return pRet;
		}
		bool initWithCGPoint(CGPoint ratio, CGPoint offset)
		{
			m_tRatio = ratio;
			m_tOffset = offset;
			m_pChild = NULL;
			return true;
		}
	};

	CCParallaxNode::CCParallaxNode()
	{
		m_pParallaxArray = ccArrayNew(5);		
		m_tLastPosition = CGPointMake(-100,-100);
	}
	CCParallaxNode::~CCParallaxNode()
	{
		if( m_pParallaxArray )
		{
			ccArrayFree(m_pParallaxArray);
			m_pParallaxArray = NULL;
		}
	}
	CCParallaxNode * CCParallaxNode::node()
	{
		CCParallaxNode *pRet = new CCParallaxNode();
		pRet->autorelease();
		return pRet;
	}
	CCNode * CCParallaxNode::addChild(CCNode * child, int zOrder, int tag)
	{
		NSAssert(0,"ParallaxNode: use addChild:z:parallaxRatio:positionOffset instead");
		return NULL; 
	}
	CCParallaxNode * CCParallaxNode::addChild(CCNode *child, int z, CGPoint ratio, CGPoint offset)
	{
		NSAssert( child != NULL, "Argument must be non-nil");
		CGPointObject *obj = CGPointObject::pointWithCGPoint(ratio, offset);
		obj->setChild(child);
		ccArrayAppendObjectWithResize(m_pParallaxArray, (NSObject*)obj);

		CGPoint pos = m_tPosition;
		float x = pos.x * ratio.x + offset.x;
		float y = pos.y * ratio.y + offset.y;
		child->setPosition(ccp(x,y));

		return (CCParallaxNode*)CCNode::addChild(child, z, child->getTag());
	}
	void CCParallaxNode::removeChild(CCNode* child, bool cleanup)
	{
		for( unsigned int i=0;i < m_pParallaxArray->num;i++)
		{
			CGPointObject *point = (CGPointObject*)m_pParallaxArray->arr[i];
			if( point->getChild()->isEqual(child)) 
			{
				ccArrayRemoveObjectAtIndex(m_pParallaxArray, i);
				break;
			}
		}
		CCNode::removeChild(child, cleanup);
	}
	void CCParallaxNode::removeAllChildrenWithCleanup(bool cleanup)
	{
		ccArrayRemoveAllObjects(m_pParallaxArray);
		CCNode::removeAllChildrenWithCleanup(cleanup);
	}
	CGPoint CCParallaxNode::absolutePosition()
	{
		CGPoint ret = m_tPosition;
		CCNode *cn = this;
		while (cn->getParent() != NULL)
		{
			cn = cn->getParent();
			ret = ccpAdd( ret,  cn->getPosition());
		}
		return ret;
	}

	/*
	The positions are updated at visit because:
	- using a timer is not guaranteed that it will called after all the positions were updated
	- overriding "draw" will only precise if the children have a z > 0
	*/
	void CCParallaxNode::visit()
	{
		//	CGPoint pos = position_;
		//	CGPoint	pos = [self convertToWorldSpace:CGPointZero];
		CGPoint pos = this->absolutePosition();
		if( ! CGPoint::CGPointEqualToPoint(pos, m_tLastPosition) )
		{
			for(unsigned int i=0; i < m_pParallaxArray->num; i++ ) 
			{
				CGPointObject *point = (CGPointObject*)m_pParallaxArray->arr[i];
				float x = -pos.x + pos.x * point->getRatio().x + point->getOffset().x;
				float y = -pos.y + pos.y * point->getRatio().y + point->getOffset().y;			
				point->getChild()->setPosition(ccp(x,y));
			}
			m_tLastPosition = pos;
		}
		CCNode::visit();
	}

}// namespace cocos2d