axmol/cocos2dx/include/CCAtlasNode.h

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#ifndef __CCATLAS_NODE_H__
#define __CCATLAS_NODE_H__

#include "CCNode.h"
#include "CCProtocols.h"
#include "CCTextureAtlas.h"

/** CCAtlasNode is a subclass of CCNode that implements the CCRGBAProtocol and
CCTextureProtocol protocol

It knows how to render a TextureAtlas object.
If you are going to render a TextureAtlas consider subclassing CCAtlasNode (or a subclass of CCAtlasNode)

All features from CCNode are valid, plus the following features:
- opacity and RGB colors
*/
class CCAtlasNode : public CCNode, public CCRGBAProtocol, public CCTextureProtocol
{
protected:

	// chars per row
	int m_nItemsPerRow;
	// chars per column
	int m_nItemsPerColumn;

	// texture coordinate x increment
	float m_fTexStepX;
	// texture coordinate y increment
	float m_fTexStepY;

	// width of each char
	int	m_nItemWidth;
	// height of each char
	int	m_nItemHeight;

	ccColor3B	m_tColorUnmodified;

	CCTextureAtlas * m_pTextureAtlas;

	// protocol variables
	CCX_PROPERTY(bool, m_bIsOpacityModifyRGB, IsOpacityModifyRGB)
	CCX_PROPERTY(ccBlendFunc, m_tBlendFunc, BlendFunc);
	CCX_PROPERTY(GLubyte, m_cOpacity, Opacity);
	CCX_PROPERTY(ccColor3B, m_tColor, Color);

public:
	CCAtlasNode();
	~CCAtlasNode();

	/** creates a CCAtlasNode  with an Atlas file the width and height of each item and the quantity of items to render*/
	static CCAtlasNode * atlasWithTileFile(std::string & tile,int tileWidth, int tileHeight, int itemsToRender);

	/** initializes an CCAtlasNode  with an Atlas file the width and height of each item and the quantity of items to render*/
	CCAtlasNode * initWithTileFile(std::string & tile, int tileWidth, int tileHeight, int itemsToRender);

	/** updates the Atlas (indexed vertex array).
	* Shall be overriden in subclasses
	*/
	void updateAtlasValues();

	virtual void draw();

	// CC Texture protocol

	// returns the used texture
	virtual CCTexture2D* getTexture(void);

	// sets a new texture. it will be retained
	virtual void setTexture(CCTexture2D *texture);

private :
	void calculateMaxItems();
	void calculateTexCoordsSteps();
	void updateBlendFunc();
	void updateOpacityModifyRGB();

};

#endif // __CCATLAS_NODE_H__