UVtools/UVtools.Core/Extensions/MathExtensions.cs

/*
 *                     GNU AFFERO GENERAL PUBLIC LICENSE
 *                       Version 3, 19 November 2007
 *  Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
 *  Everyone is permitted to copy and distribute verbatim copies
 *  of this license document, but changing it is not allowed.
 */

using System;
using System.Globalization;

namespace UVtools.Core.Extensions
{
    public static class MathExtensions
    {
        public static byte Clamp(this byte value, byte min, byte max)
        {
            return value <= min ? min : value >= max ? max : value;
        }

        public static sbyte Clamp(this sbyte value, sbyte min, sbyte max)
        {
            return value <= min ? min : value >= max ? max : value;
        }

        public static ushort Clamp(this ushort value, ushort min, ushort max)
        {
            return value <= min ? min : value >= max ? max : value;
        }

        public static short Clamp(this short value, short min, short max)
        {
            return value <= min ? min : value >= max ? max : value;
        }

        public static uint Clamp(this uint value, uint min, uint max)
        {
            return value <= min ? min : value >= max ? max : value;
        }

        public static int Clamp(this int value, int min, int max)
        {
            return value <= min ? min : value >= max ? max : value;
        }

        public static ulong Clamp(this ulong value, ulong min, ulong max)
        {
            return value <= min ? min : value >= max ? max : value;
        }

        public static long Clamp(this long value, long min, long max)
        {
            return value <= min ? min : value >= max ? max : value;
        }

        public static float Clamp(this float value, float min, float max)
        {
            return value <= min ? min : value >= max ? max : value;
        }

        public static double Clamp(this double value, double min, double max)
        {
            return value <= min ? min : value >= max ? max : value;
        }

        public static decimal Clamp(this decimal value, decimal min, decimal max)
        {
            return value <= min ? min : value >= max ? max : value;
        }

        public static T Clamp<T>(T value, T min, T max) where T : IComparable<T>
        {
            if (value.CompareTo(min) < 0)
                return min;
            if (value.CompareTo(max) > 0)
                return max;

            return value;
        }

        public static uint DecimalDigits(this float val)
        {
            var valStr = val.ToString(CultureInfo.InvariantCulture).TrimEnd('0');
            if (string.IsNullOrEmpty(valStr)) return 0;

            var index = valStr.IndexOf('.');
            if (index < 0) return 0;

            return (uint) (valStr[index..].Length - 1);
        }

        public static uint DecimalDigits(this double val)
        {
            var valStr = val.ToString(CultureInfo.InvariantCulture).TrimEnd('0');
            if (string.IsNullOrEmpty(valStr)) return 0;

            var index = valStr.IndexOf('.');
            if (index < 0) return 0;

            return (uint)(valStr[index..].Length - 1);
        }

        public static uint DecimalDigits(this decimal val)
        {
            var valStr = val.ToString(CultureInfo.InvariantCulture).TrimEnd('0');
            if (string.IsNullOrEmpty(valStr) || valStr[^1] == '.') return 0;

            var index = valStr.IndexOf('.');
            if (index < 0) return 0;

            return (uint)(valStr[index..].Length - 1);
        }

        public static bool IsInteger(this float val, float tolerance = 0.0001f) => Math.Abs(val - Math.Floor(val)) < tolerance;
        public static bool IsInteger(this double val, double tolerance = 0.0001) => Math.Abs(val - Math.Floor(val)) < tolerance;
        public static bool IsInteger(this decimal val) => val == Math.Floor(val);

        public static int GCD(int a, int b)
        {
            while (a != 0 && b != 0)
            {
                if (a > b)
                    a %= b;
                else
                    b %= a;
            }

            return a | b;
        }

        public static uint GCD(uint a, uint b)
        {
            while (a != 0 && b != 0)
            {
                if (a > b)
                    a %= b;
                else
                    b %= a;
            }

            return a | b;
        }

        public static ulong GCD(ulong a, ulong b)
        {
            while (a != 0 && b != 0)
            {
                if (a > b)
                    a %= b;
                else
                    b %= a;
            }

            return a | b;
        }

    }
}