axmol/cocos2dx/include/CCRibbon.h

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Copyright (c) 2010-2011  cocos2d-x.org
Copyright (c) 2008, 2009 Jason Booth

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#ifndef __CCRIBBON_H__
#define __CCRIBBON_H__

/*#include <GLES/egl.h>*/
#include "CCNode.h"
#include "CCProtocols.h"

namespace cocos2d {

class CCRibbonSegment;
/**
* @brief A CCRibbon is a dynamically generated list of polygons drawn as a single or series
* of triangle strips. The primary use of CCRibbon is as the drawing class of Motion Streak,
* but it is quite useful on it's own. When manually drawing a ribbon, you can call addPointAt
* and pass in the parameters for the next location in the ribbon. The system will automatically
* generate new polygons, texture them accourding to your texture width, etc, etc.
*
* CCRibbon data is stored in a CCRibbonSegment class. This class statically allocates enough verticies and
* texture coordinates for 50 locations (100 verts or 48 triangles). The ribbon class will allocate
* new segments when they are needed, and reuse old ones if available. The idea is to avoid constantly
* allocating new memory and prefer a more static method. However, since there is no way to determine
* the maximum size of some ribbons (motion streaks), a truely static allocation is not possible.
*
* @since v0.8.1
*/
class CC_DLL CCRibbon : public CCNode, public CCTextureProtocol
{
	/** Texture used by the ribbon. Conforms to CCTextureProtocol protocol */
	CC_PROPERTY(CCTexture2D*, m_pTexture, Texture)
	/** Texture lengths in pixels */
	CC_PROPERTY(float, m_fTextureLength, TextureLength)
	/** GL blendind function */
	CC_PROPERTY(ccBlendFunc, m_tBlendFunc, BlendFunc)
	/** color used by the Ribbon (RGBA) */
	CC_PROPERTY(ccColor4B, m_tColor, Color)

public:
    CCRibbon() : m_pTexture(0), m_pSegments(0), m_pDeletedSegments(0){}
	virtual ~CCRibbon();

	/** creates the ribbon */
	static CCRibbon * ribbonWithWidth(float w, const char *path, float length, ccColor4B color, float fade);
	/** init the ribbon */
	bool initWithWidth(float w, const char *path, float length, ccColor4B color, float fade);
	/** add a point to the ribbon */
	void addPointAt(CCPoint location, float width);
	/** polling function */
	void update(ccTime delta);
	/** determine side of line */
	float sideOfLine(CCPoint p, CCPoint l1, CCPoint l2);
	// super method
	virtual void draw();
private:
	/** rotates a point around 0, 0 */
	CCPoint rotatePoint(CCPoint vec, float rotation);
protected:
	CCMutableArray<CCRibbonSegment*> *m_pSegments;
	CCMutableArray<CCRibbonSegment*> *m_pDeletedSegments;

	CCPoint	m_tLastPoint1;
	CCPoint	m_tLastPoint2;
	CCPoint	m_tLastLocation;
// 	int		m_nVertCount_;
	float	m_fTexVPos;
	float	m_fCurTime;
	float	m_fFadeTime;
	float	m_fDelta;
	float	m_fLastWidth;
	float	m_fLastSign;
	bool	m_bPastFirstPoint;
};

/** @brief object to hold ribbon segment data */
class CC_DLL CCRibbonSegment : public CCObject
{
public:
	GLfloat	m_pVerts[50*6];
	GLfloat	m_pCoords[50*4];
	GLubyte	m_pColors[50*8];
	float	m_pCreationTime[50];
	bool	m_bFinished;
	unsigned int	m_uEnd;
	unsigned int	m_uBegin;
public:
	CCRibbonSegment()
		: m_bFinished(false)
		, m_uBegin(0)
		, m_uEnd(0)
	{}
	virtual ~CCRibbonSegment();
	char * description();
	bool init();
	void reset();
	void draw(float curTime, float fadeTime, ccColor4B color);
};

} // namespace cocos2d

#endif //__CCRIBBON_H__