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;

	// protocol variables
	bool m_bOpacityModifyRGB;
	ccBlendFunc m_tBlendFunc;
	GLubyte m_cOpacity;
	ccColor3B m_tColor;
	CCTextureAtlas * m_pTextureAtlas;

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();

public:
	// CC RGBA protocol

	/** sets Color
	@since v0.8
	*/
	virtual void setColor(ccColor3B color);

	/** returns the color
	@since v0.8
	*/
	virtual ccColor3B color(void);

	// returns the opacity
	virtual GLubyte opacity(void);

	/** sets the opacity.
	@warning If the the texture has premultiplied alpha then, the R, G and B channels will be modifed.
	Values goes from 0 to 255, where 255 means fully opaque.
	*/
	virtual void setOpacity(GLubyte opacity);

	// optional

	/** sets the premultipliedAlphaOpacity property.
	If set to NO then opacity will be applied as: glColor(R,G,B,opacity);
	If set to YES then oapcity will be applied as: glColor(opacity, opacity, opacity, opacity );
	Textures with premultiplied alpha will have this property by default on YES. Otherwise the default value is NO
	@since v0.8
	*/
	virtual void setOpacityModifyRGB(bool bValue);

	/** returns whether or not the opacity will be applied using glColor(R,G,B,opacity) or glColor(opacity, opacity, opacity, opacity);
	@since v0.8
	*/
	virtual bool doesOpacityModifyRGB(void);

	// CC Blend protocol

	// set the source blending function for the texture
	virtual void setBlendFunc(ccBlendFunc blendFunc);

	// returns the blending function used for the texture
	virtual ccBlendFunc blendFunc(void);

	// CC Texture protocol

	// returns the used texture
	virtual CCTexture2D* texture(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__