Method CalcForce

Feedback360/Feedback360Effect.cpp:165–277

}

void Feedback360Effect::CalcForce(ULONG Duration, ULONG CurrentPos, LONG NormalRate, LONG AttackLevel, LONG FadeLevel, LONG * NormalLevel)
{
    LONG Magnitude = 0;
    LONG Period;
    LONG R;
    LONG Rate;

    if (CFEqual(Type, kFFEffectType_ConstantForce_ID)) {
        Magnitude	= DiConstantForce.lMagnitude;
        Magnitude	= ( Magnitude * NormalRate + AttackLevel + FadeLevel ) / 100;
    }
    else if (CFEqual(Type, kFFEffectType_Square_ID)) {
        Period	= max( (DWORD)1, ( DiPeriodic.dwPeriod / 1000 ) );
        R		= ( CurrentPos%Period) * 360 / Period;
        R	= ( R + ( DiPeriodic.dwPhase / 100 ) ) % 360;

        Magnitude	= DiPeriodic.dwMagnitude;
        Magnitude	= ( Magnitude * NormalRate + AttackLevel + FadeLevel ) / 100;

        if (180 <= R)
        {
            Magnitude = Magnitude * -1;
        }

        Magnitude	= Magnitude + DiPeriodic.lOffset;
    }
    else if (CFEqual(Type, kFFEffectType_Sine_ID)) {
        Period	= max( (DWORD)1, ( DiPeriodic.dwPeriod / 1000 ) );
        R		= (CurrentPos%Period) * 360 / Period;
        R		= ( R + ( DiPeriodic.dwPhase / 100 ) ) % 360;

        Magnitude	= DiPeriodic.dwMagnitude;
        Magnitude	= ( Magnitude * NormalRate + AttackLevel + FadeLevel ) / 100;

        Magnitude	= ( int)( Magnitude * sin( R * M_PI / 180.0 ) );

        Magnitude	= Magnitude + DiPeriodic.lOffset;
    }
    else if (CFEqual(Type, kFFEffectType_Triangle_ID)) {
        Period	= max( (DWORD)1, ( DiPeriodic.dwPeriod / 1000 ) );
        R		= (CurrentPos%Period) * 360 / Period;
        R		= ( R + ( DiPeriodic.dwPhase / 100 ) ) % 360;

        Magnitude	= DiPeriodic.dwMagnitude;
        Magnitude	= ( Magnitude * NormalRate + AttackLevel + FadeLevel ) / 100;

        if (0 <= R && R < 90)
        {
            Magnitude	= -Magnitude * ( 90 - R ) / 90;
        }
        if (90 <= R && R < 180)
        {
            Magnitude	= Magnitude * ( R - 90 ) / 90;
        }
        if (180 <= R && R < 270)
        {
            Magnitude	= Magnitude * ( 90 - ( R - 180 ) ) / 90;
        }