axmol/cocos2dx/include/CCAtlasNode.h

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#ifndef __CCATLAS_NODE_H__
#define __CCATLAS_NODE_H__

#include "CCNode.h"
#include "CCProtocols.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:
	// texture atlas
	//CCTextureAtlas	*textureAtlas_;

	// chars per row
	int m_iItemsPerRow;
	// chars per column
	int m_iItemsPerColumn;

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

	// width of each char
	int	m_iItemWidth;
	// height of each char
	int	m_iItemHeight;

	// blend function
	//ccBlendFunc		blendFunc_;

	// texture RGBA. 
	//GLubyte		opacity_;
	//ccColor3B	color_;
	ccColor3B	m_tColorUnmodified;
	bool m_bOpacityModifyRGB;

	/** conforms to CCTextureProtocol protocol */
	CCX_DECLARE_VAR_READWRITE(CCTextureAtlas *, m_tTextureAtlas, TextureAtlas)

	/** conforms to CCTextureProtocol protocol */
	CCX_DECLARE_VAR_READWRITE(ccBlendFunc, m_tBlendFunc, BlendFunc)

	/** conforms to CCRGBAProtocol protocol */
	CCX_DECLARE_VAR_READWRITE(GLubyte, m_cOpacity, Opacity)

	/** conforms to CCRGBAProtocol protocol */
	CCX_DECLARE_VAR_READWRITE(ccColor3B, m_tColor, Color)

private:

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

public:

	CCAtlasNode();

	virtual ~CCAtlasNode();

	/** creates a CCAtlasNode  with an Atlas file the width and height of each item and the quantity of items to render*/
	static void* atlasWithTileFile(NSString* 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*/
	void* initWithTileFile(NSString* tile, int tileWidth, int tileHeight, int itemsToRender;

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

public: //CCNode methods
	virtual void draw(void);

public: //CCRGBAProtocol methods
	/** sets Color
	@since v0.8
	*/
	virtual void setColor(ccColor3B color) = 0;

	/** returns the color
	@since v0.8
	*/
	virtual ccColor3B color(void) = 0;

	// returns the opacity
	virtual GLubyte opacity(void) = 0;

	/** 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) = 0;

	// 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) = { return false;}

public: // CCTextureProtocol methods
	// returns the used texture
	virtual CCTexture2D* texture(void) = 0;

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

};

#endif // __CCATLAS_NODE_H__