enmath.c

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class Math
{
    private void Math() {}
    private void ~Math() {}
    
    static const float EULER = 2.7182818284590452353;
    static const float PI = 3.14159265358979;
    static const float PI2 = 6.28318530717958;
    static const float PI_HALF = 1.570796326794;
 
    static const float RAD2DEG = 57.2957795130823208768;
    static const float DEG2RAD = 0.01745329251994329577;
 
    proto static int GetNumberOfSetBits(int i);
    
    proto static int GetNthBitSet(int value, int n);
    
    proto static int RandomInt(int min, int max);
    
    static int RandomIntInclusive(int min, int max)
    {
        return Math.RandomInt(min, max+1);
    }
    
    static bool RandomBool()
    {
        return RandomIntInclusive(0,1);
    }
    
    proto static float RandomFloat(float min, float max);
 
    static float RandomFloatInclusive(float min, float max)
    {
        int max_range = Math.Pow(2, 30); //max range
        int random_int = Math.RandomInt(0, max_range);
        float rand_float = (float)random_int / (float)max_range;
        float range = max - min;
 
        return min + (rand_float * range); //rand float
    }
 
    static float RandomFloat01()
    {
        return RandomFloatInclusive(0, 1);
    }
    
    proto static int Randomize(int seed);
    
    proto static float NormalizeAngle(float ang);
 
    proto static float DiffAngle(float angle1, float angle2);
    
    proto static float Pow(float v, float power);
 
    proto static float ModFloat(float x, float y);
 
    proto static float RemainderFloat(float x, float y);
    
    proto static float AbsFloat(float f);
 
    proto static int AbsInt(int i);
 
    proto static float SignFloat(float f);
 
    proto static int SignInt(int i);
    
    proto static float SqrFloat(float f);
 
    proto static int SqrInt(int i);
    
    proto static float Sqrt(float val);
    
    proto static float Log2(float x);
 
    proto static float Sin(float angle);
 
    proto static float Cos(float angle);
 
    proto static float Tan(float angle);
 
    proto static float Asin(float s);
 
    proto static float Acos(float c);
    
    proto static float Atan(float x);
 
    proto static float Atan2(float y, float x);
 
    proto static float Round(float f);
        
    proto static float Floor(float f);
 
    proto static float Ceil(float f);
    
    proto static float WrapFloat(float f, float min, float max);
    
    proto static float WrapFloatInclusive(float f, float min, float max);
    
    proto static float WrapFloat0X(float f, float max);
    
    proto static float WrapFloat0XInclusive(float f, float max);
    
    proto static int WrapInt(int i, int min, int max);
    
    proto static int WrapInt0X(int i, int max);
 
    proto static float Clamp(float value, float min, float max);
        
    proto static float Min(float x, float y);
    
    proto static float Max(float x, float y);   
    
    proto static bool IsInRange(float v, float min, float max);
    
    proto static bool IsInRangeInt(int v, int min, int max);
    
    proto static float Lerp(float a, float b, float time);
 
    proto static float InverseLerp(float a, float b, float value);
    
    proto static float AreaOfRightTriangle(float s, float a);
    
    proto static float HypotenuseOfRightTriangle(float s, float a);
    
    proto static bool IsPointInCircle(vector c, float r, vector p);
    
    proto static bool IsPointInRectangle(vector mi, vector ma, vector p);
    
    //--------------------------------------------------------------------------
    //-------------------------------- filters ---------------------------------
    //--------------------------------------------------------------------------
 
    proto static float SmoothCD(float val, float target, inout float velocity[], float smoothTime, float maxVelocity, float dt);
    
    static float SmoothCDPI2PI(float val, float target, inout float velocity[], float smoothTime, float maxVelocity, float dt)
    {
        float diff = target - val;
        if (diff < -Math.PI)
        {
            target += Math.PI2;
        }
        else if (diff > Math.PI)
        {
            target -= Math.PI2;
        }
        
        float retVal = SmoothCD(val, target, velocity, smoothTime, maxVelocity, dt);
        
        while (retVal > Math.PI)
        {
            retVal -= Math.PI2;
        }
        
        while (retVal < -Math.PI)
        {
            retVal += Math.PI2;
        }
        
        return retVal;
    }
    
    static float Poisson(float mean, int occurences)
    {
        return Pow(mean, occurences) * Pow(EULER,-mean) / Factorial(occurences);
    }
    
    static int Factorial(int val)
    {
        if (val > 12)
        {
            ErrorEx("Values above '12' cause int overflow! Returning '1'",ErrorExSeverity.INFO);
            return 1;
        }
        
        int res = 1;
        while (val > 1)
        {
            res *= val--;
        }
        return res;
    }
    
    static float Remap(float inputMin, float inputMax, float outputMin, float outputMax, float inputValue, bool clampedOutput = true)
    {
        float tempValue = Math.InverseLerp(inputMin, inputMax, inputValue);
        float remapped = Math.Lerp(outputMin, outputMax, tempValue);
        
        if (clampedOutput)
            return Math.Clamp(remapped, outputMin, outputMax);
        
        return remapped;
    }
    
    static vector CenterOfRectangle(vector min, vector max)
    {
        float x = (min[0] + max[0]) * 0.5;
        float z = (min[2] + max[2]) * 0.5;
        
        return Vector(x, 0.0, z);
    }
 
    static bool VectorIsEqual(vector v1, vector v2, float tolerance)
    {
        return (Math.AbsFloat(v1[0] - v2[0]) <= tolerance && Math.AbsFloat(v1[1] - v2[1]) <= tolerance && Math.AbsFloat(v1[2] - v2[2]) <= tolerance);
    }
}