SCR_Math.c

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class SCR_Math
{
    //~ Random generator used in scripted Math functions
    protected const static ref RandomGenerator RANDOM_GENERATOR = new RandomGenerator();
    
    //------------------------------------------------------------------------------------------------
    // TODO: [Obsolete("Use Math.Mod instead")]
    static float fmod(float dividend, float divisor)
    {
        if (divisor == 0)
            return 0;
 
        return dividend - Math.Floor(dividend / divisor) * divisor;
    }
 
    //------------------------------------------------------------------------------------------------
    static float LerpAngle(float a, float b, float t)
    {
        float dt = fmod(b - a, 360);
        if (dt > 180)
            dt -= 360;
 
        return fmod(Math.Lerp(a, a + dt, t), 360);
    }
 
    //------------------------------------------------------------------------------------------------
    static float DeltaAngle(float a, float b)
    {
        return 180 - Math.AbsFloat(fmod(Math.AbsFloat(b - a), 360) - 180);
    }
 
    //------------------------------------------------------------------------------------------------
    static int IntegerMask(int x)
    {
        x |= (x >> 1);
        x |= (x >> 2);
        x |= (x >> 4);
        x |= (x >> 8);
        x |= (x >> 16);
        return x;
    }
 
    //------------------------------------------------------------------------------------------------
    static float GetDistanceToStop(float speed, float deceleration)
    {
        float distance = 0;
        if (deceleration > 0)
            distance = 0.5 * speed * speed / deceleration;
        else if (speed > 0)
            distance = 1e10;
 
        return distance;
    }
 
    //------------------------------------------------------------------------------------------------
    static float GetSpeedToReachDistance(float distance, float deceleration)
    {
        float speed = 0;
        if (distance > 0 && deceleration > 0)
            speed = Math.Sqrt(2 * distance * deceleration);
 
        return speed;
    }
 
    //------------------------------------------------------------------------------------------------
    static float GetSpeedToReachDistanceInTime(float distance, float deceleration, float time)
    {
        if (time <= 0)
            return 1e10;
 
        // Get the decelerated part
        float speed = GetSpeedToReachDistance(distance, deceleration);
        float averageSpeed = distance / time;
        float additionalSpeed = averageSpeed - speed*0.5;
        speed += additionalSpeed;
 
        return speed;
    }
    
    //------------------------------------------------------------------------------------------------
    static RandomGenerator GetMathRandomGenerator()
    {
        return RANDOM_GENERATOR;
    }
};