axmol/cocos2dx/include/CCMotionStreak.h

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#ifndef __CCMOTION_STREAK_H__
#define __CCMOTION_STREAK_H__
#include "CCNode.h"
#include "CCProtocols.h"
namespace cocos2d {
	class CCRibbon;
	/**
	* @brief CCMotionStreak manages a Ribbon based on it's motion in absolute space.
	* You construct it with a fadeTime, minimum segment size, texture path, texture
	* length and color. The fadeTime controls how long it takes each vertex in
	* the streak to fade out, the minimum segment size it how many pixels the
	* streak will move before adding a new ribbon segement, and the texture
	* length is the how many pixels the texture is stretched across. The texture
	* is vertically aligned along the streak segemnts. 
	*
	* Limitations:
	*   CCMotionStreak, by default, will use the GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA blending function.
	*   This blending function might not be the correct one for certain textures.
	*   But you can change it by using:
	*     [obj setBlendFunc: (ccBlendfunc) {new_src_blend_func, new_dst_blend_func}];
	*
	* @since v0.8.1
	*/
	class CCX_DLL CCMotionStreak : public CCNode, public CCTextureProtocol
	{
		/** Ribbon used by MotionStreak (weak reference) */
		CCX_PROPERTY_READONLY(CCRibbon*, m_pRibbon, Ribbon)
		//CCTextureProtocol methods
		CCX_PROPERTY(CCTexture2D*, m_pTexture, Texture)
		CCX_PROPERTY(ccBlendFunc, m_tBlendFunc, BlendFunc)
	public:
		CCMotionStreak(){}
		virtual ~CCMotionStreak(){}
		/** creates the a MotionStreak. The image will be loaded using the TextureMgr. */
		static CCMotionStreak * streakWithFade(float fade, float seg, const char *imagePath, float width, float length, ccColor4B color);

		/** initializes a MotionStreak. The file will be loaded using the TextureMgr. */
		bool initWithFade(float fade, float seg, const char *imagePath, float width, float length, ccColor4B color);

		/** polling function */
		void update(ccTime delta);
	protected:
		float		m_fSegThreshold;
		float		m_fWidth;
		CGPoint		m_tLastLocation;
	};
} // namespace cocos2d

#endif //__CCMOTION_STREAK_H__