framecounter.cpp

c++程序

// FrameCounter.cpp: Implementierung der Klasse CFrameCounter.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "FrameCounter.h"
#include "mmsystem.h"

#define UPDATE_SPEED_MS 250

//////////////////////////////////////////////////////////////////////
// Konstruktion/Destruktion
//////////////////////////////////////////////////////////////////////

CFrameCounter::CFrameCounter()
{
	// Init member variables
	m_CurrentFrames = 0;
	m_FrameCount    = 0;
	m_LastSecond    = GetTickCount();
}

CFrameCounter::~CFrameCounter()
{

}

unsigned int CFrameCounter::GetFrameCount()
{
	// Return the last framecount
	return m_FrameCount;
}

void CFrameCounter::FrameFinished()
{
	// One more frame has been drawn

	// Has a full second elapsed ?
	if (GetTickCount() - m_LastSecond > UPDATE_SPEED_MS)
	{
		// Set the new FPS value
		m_FrameCount = m_CurrentFrames * (1000 / UPDATE_SPEED_MS);
		// Clear current frames
		m_CurrentFrames = 0;
		// Set new time value for the last second
		m_LastSecond = timeGetTime();
	}

	++m_CurrentFrames;
}