cfpscounter.h

symbian 60 3d 的一个很经典的例子

    /*
    *
============================================================================
    *  Name     : CFpsCounter.h
    *  Part of  : Example3D
    *  Created  : 12/14/2003 by Forum Nokia
    *  Description:
    *     This is the project specification file for Example3D.
    *     Initial content was generated by Series 60 AppWizard.
    *
    *  Version  : 1.0.0
    *  Copyright: Forum Nokia
    *
============================================================================
    */

#ifndef __CFPSCOUNTER_H__
#define __CFPSCOUNTER_H__

// INCLUDES
#include <e32base.h>

// CLASS DECLARATION

/**
*  Utility class to count application speed
*  in frames per second
*/

class CFpsCounter
	: public CBase
	{
	public:
		/// Two-phased constructor
		static CFpsCounter* NewL( TInt aInterval );

		/// Destructor
		~CFpsCounter();
	
	private:
		
		/// Default constructor
		/// @param aInterval update interval in seconds
		CFpsCounter( TInt aInterval );
		
	public:	// New methods
	
		/// Frames per second
		/// @return frames per second count
		TInt Fps();

		/// Updates counter
		/// This must be called every time a frame is drawn
		void Update();

		/// Sets update interval
		/// @param aInterval interval in seconds
		void SetInterval( TInt aInterval );

	private: // data

		TInt iSecs;
		TInt iInterval;
		TInt iFrames;
		TInt iSeconds;
		TInt iStartTicks;
		TInt iTicksPerSecond;
		TInt iFps;
	};
	
	
#endif