ScreenToGif/Util/MathHelper.cs

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using System;

namespace ScreenToGif.Util
{
    public static class MathHelper
    {
        public static bool NearlyEquals(this float a, float b, float epsilon = 0.0001F)
        {
            var absA = Math.Abs(a);
            var absB = Math.Abs(b);
            var diff = Math.Abs(a - b);

            if (a == b)
                return true;

            if (a == 0 || b == 0 || diff < float.Epsilon)
            {
                // a or b is zero or both are extremely close to it
                // relative error is less meaningful here
                return diff < epsilon;
            }

            // use relative error
            return diff / (absA + absB) < epsilon;
        }

        public static bool NearlyEquals(this double a, double b, double epsilon = 0.0001D)
        {
            var absA = Math.Abs(a);
            var absB = Math.Abs(b);
            var diff = Math.Abs(a - b);

            if (a == b)
            { // shortcut, handles infinities
                return true;
            }

            if (a == 0 || b == 0 || diff < double.Epsilon)
            {
                // a or b is zero or both are extremely close to it
                // relative error is less meaningful here
                return diff < epsilon;
            }

            // use relative error
            return diff / (absA + absB) < epsilon;
        }

        public static bool NearlyEquals(this double a, int absB, double epsilon = 0.0001D)
        {
            var absA = Math.Abs(a);
            var diff = Math.Abs(a - absB);

            if (a == absB)
            { // shortcut, handles infinities
                return true;
            }

            if (a == 0 || absB == 0 || diff < double.Epsilon)
            {