cocos2d-x onMouseMove中CCTouch *pTouch参数的细节

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#ifndef __CC_TOUCH_H__
#define __CC_TOUCH_H__

#include "cocoa/CCObject.h"
#include "cocoa/CCGeometry.h"

NS_CC_BEGIN

/**
 * @addtogroup input
 * @{
 */

class CC_DLL CCTouch : public CCObject
{
public:
    CCTouch() 
        : m_nId(0)
    {}

    /** returns the current touch location in OpenGL coordinates */
    CCPoint getLocation() const;
    /** returns the previous touch location in OpenGL coordinates */
    CCPoint getPreviousLocation() const;
    /** returns the delta of 2 current touches locations in screen coordinates */
    CCPoint getDelta() const;
    /** returns the current touch location in screen coordinates */
    CCPoint getLocationInView() const;
    /** returns the previous touch location in screen coordinates */
    CCPoint getPreviousLocationInView() const;

    /** returns the current touch location in screen coordinates
     @deprecated: use CCTouch::getLocationInView() instead. 
     CCTouch::getLocation() is recommended, it will return OpenGL coordinate.
    */
    CC_DEPRECATED_ATTRIBUTE CCPoint locationInView()  { return m_point; }
    
    /** returns the current previous location in screen coordinates
     @deprecated: use CCTouch::getPreviousLocationInView() instead. 
     CCTouch::getPreviousLocation() is recommended, it will return OpenGL coordinate.
     */
    CC_DEPRECATED_ATTRIBUTE CCPoint previousLocationInView() { return m_prevPoint; }
    
    void setTouchInfo(int id, float x, float y)
    {
        m_nId = id;
        m_prevPoint = m_point;
        m_point.x   = x;
        m_point.y   = y;
    }

    int getID() const
    {
        return m_nId;
    }

private:
    int m_nId;
    CCPoint m_point;
    CCPoint m_prevPoint;
};

class CC_DLL CCEvent : public CCObject
{
};

// end of input group
/// @}

NS_CC_END

#endif  // __PLATFORM_TOUCH_H__