|| || || || || || || ||

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FramesPerSecond.h

Go to the documentation of this file.

#ifndef OglGui_FramesPerSecond_h
#define OglGui_FramesPerSecond_h

/*
#ifndef OglGui_time_included
#include <time.h>
#define OglGui_time_included
#endif
*/

#ifndef OglGui_StaticText_h
#include "OglGui/StaticText.h"
#endif

namespace OglGui
{

class FramesPerSecond : public StaticText
{
public:

    FramesPerSecond(Window* parent, int x, int y, int width, int height) :
        StaticText(parent, x, y, width, height, "")
    {
        Init();
    }

    FramesPerSecond(Window* parent, int width, int height) :
        StaticText(parent, width, height, "")
    {
        Init();
    }

    virtual void
    DisplayFunc()
    {
        char    buf[40];
        float   elapsedSec;

        if (!mInitialized)
        {
            mInitialized = true;
            mFrameCount = mIntervalFrameCount = 0;
            mLastInterval = mStartTime = OglClock();
        }

        mFrameCount++;
        mIntervalFrameCount++;

        elapsedSec = OglClock() - mLastInterval;

        // Wait 3 tenth of a second after a reset before computing fps
        // This prevents too strong changes in fps at interval resets
        if (elapsedSec > 0.3f)
            mFramesPerSecond = mIntervalFrameCount / elapsedSec;
        
        sprintf(buf,"%.1f fps", mFramesPerSecond);
        SetText(buf);

        // To prevent misguided information when the display has been
        // interrupted reset every 5 seconds
        if (elapsedSec > 5)
        {
            elapsedSec = 0.0f;
            mIntervalFrameCount = 0;
            mLastInterval = OglClock();
        }

        StaticText::DisplayFunc();
    }

private :

    double mStartTime; // Not used yet
    double mLastInterval;
    float   mFramesPerSecond;
    int     mFrameCount; // Not used yet
    int     mIntervalFrameCount;
    bool    mInitialized;

    void
    Init()
    {
        mFramesPerSecond = 0.0f;
        mInitialized = false;
        SetBorderType(BEV_LINE);
    }
};

} // namespace OglGui

#endif

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