DoubleUtil

using System.Runtime.InteropServices;
using System.Windows;

namespace System {

    public static class DoubleUtil {
        // Fields
        public const double DBL_EPSILON = 2.2204460492503131E-16;
        public const float FLT_MIN = 1.175494E-38f;

        // Methods
        public static bool AreClose(double value1,double value2) {
            if(value1 == value2) {
                return true;
            }
            double num = ((Math.Abs(value1) + Math.Abs(value2)) + 10.0) * 2.2204460492503131E-16;
            double num2 = value1 - value2;
            return ((-num < num2) && (num > num2));
        }

        public static bool AreClose(Point point1,Point point2) {
            return (AreClose(point1.X,point2.X) && AreClose(point1.Y,point2.Y));
        }

        public static bool GreaterThan(double value1,double value2) {
            return ((value1 > value2) && !AreClose(value1,value2));
        }

        public static bool GreaterThanOrClose(double value1,double value2) {
            if(value1 <= value2) {
                return AreClose(value1,value2);
            }
            return true;
        }

        public static bool IsNaN(double value) {
            NanUnion union = new NanUnion
            {
                DoubleValue = value
            };
            ulong num = union.UintValue & 18442240474082181120L;
            ulong num2 = union.UintValue & ((ulong)4503599627370495L);
            if((num != 9218868437227405312L) && (num != 18442240474082181120L)) {
                return false;
            }
            return (num2 != 0L);
        }

        public static bool IsOne(double value) {
            return (Math.Abs((double)(value - 1.0)) < 2.2204460492503131E-15);
        }

        public static bool LessThan(double value1,double value2) {
            return ((value1 < value2) && !AreClose(value1,value2));
        }

        public static bool LessThanOrClose(double value1,double value2) {
            if(value1 >= value2) {
                return AreClose(value1,value2);
            }
            return true;
        }

        // Nested Types
        [StructLayout(LayoutKind.Explicit)]
        private struct NanUnion {
            // Fields
            [FieldOffset(0)]
            public double DoubleValue;
            [FieldOffset(0)]
            public ulong UintValue;
        }
    }
}