public static double RoundUp(double v, double amount)
{
const System.MidpointRounding rounding = System.MidpointRounding.ToEven;
var result = Round(v + (amount / 2.0), rounding, amount);
return(result);
}
/// <summary>
/// rounds val to the nearest fractional value
/// </summary>
/// <param name="val">the value tp round</param>
/// <param name="rounding">what kind of rounding</param>
/// <param name="frac"> round to this value (must be greater than 0.0)</param>
/// <returns>the rounded value</returns>
private double Round(double val, System.MidpointRounding rounding, double frac)
{
if (frac <= 0)
{
throw new System.ArgumentOutOfRangeException(nameof(frac), "must be greater than or equal to 0.0");
}
double retval = System.Math.Round((val / frac), rounding) * frac;
return(retval);
}
/// <summary>
/// rounds val to the nearest fractional value
/// </summary>
/// <param name="val">the value tp round</param>
/// <param name="rounding">what kind of rounding</param>
/// <param name="frac"> round to this value (must be greater than 0.0)</param>
/// <returns>the rounded value</returns>
public static double Round(double val, System.MidpointRounding rounding, double frac)
{
/*
* if (frac <= 0)
* {
* throw new ArgumentOutOfRangeException("frac","must be greater than or equal to 0.0");
* }*/
double retval = System.Math.Round((val / frac), rounding) * frac;
return(retval);
}
public static double RoundApproximate(double dbl, int digits, double margin, System.MidpointRounding mode)
{
double fraction = dbl * System.Math.Pow(10, digits);
double value = System.Math.Truncate(fraction);
fraction = fraction - value;
if (fraction == 0)
{
return(dbl);
}
double tolerance = margin * dbl;
// Determine whether this is a midpoint value.
if ((fraction >= .5 - tolerance) & (fraction <= .5 + tolerance))
{
if (mode == System.MidpointRounding.AwayFromZero)
{
return((value + 1) / System.Math.Pow(10, digits));
}
else
if (value % 2 != 0)
{
return((value + 1) / System.Math.Pow(10, digits));
}
else
{
return(value / System.Math.Pow(10, digits));
}
}
// Any remaining fractional value greater than .5 is not a midpoint value.
if (fraction > .5)
{
return((value + 1) / System.Math.Pow(10, digits));
}
else
{
return(value / System.Math.Pow(10, digits));
}
}
/// <summary>
/// <see cref="System.Math.Round(decimal, int, System.MidpointRounding)"/> のラップメソッドを提供します。
/// </summary>
/// <param name="value">インスタンス。</param>
/// <param name="digits">小数部桁数。</param>
/// <param name="mode">丸めの方法。</param>
/// <returns>
/// 丸めた結果を返却します。
/// </returns>
public static decimal Round(this decimal value, int digits = 0, System.MidpointRounding mode = System.MidpointRounding.ToEven)
{
return(System.Math.Round(value, digits, mode));
}
public static float RoundBelowZero(this float v, int d = 7, System.MidpointRounding r = default(System.MidpointRounding))
{
return((float)System.Math.Round(v, d, r));
}
public static Size Round(Size value, System.MidpointRounding midpointRounding = System.MidpointRounding.ToEven)
{
return(new Size(Round(value.Width, midpointRounding), Round(value.Height, midpointRounding)));
}
public static Vector2 Round(Vector2 value, System.MidpointRounding midpointRounding = System.MidpointRounding.ToEven)
{
return(new Vector2(Round(value.X, midpointRounding), Round(value.Y, midpointRounding)));
}
public static double Round(double n, System.MidpointRounding midpointRounding = System.MidpointRounding.ToEven)
{
return(System.Math.Round(n, midpointRounding));
}
public static float Round(float n, System.MidpointRounding midpointRounding = System.MidpointRounding.ToEven)
{
return((float)System.Math.Round(n, midpointRounding));
}
/// <summary>
/// Get the value of <see cref="System.Math.Round(System.Decimal, System.Int32, System.MidpointRounding)"/> for this <see cref="System.Decimal"/> value.
/// </summary>
public static System.Decimal RoundExt(this System.Decimal d, System.Int32 decimals, System.MidpointRounding mode)
{
return(System.Math.Round(d, decimals, mode));
}
/// <summary>
/// Get the value of <see cref="System.Math.Round(System.Double, System.Int32, System.MidpointRounding)"/> for this <see cref="System.Double"/> value.
/// </summary>
public static System.Double Round(this System.Double value, System.Int32 digits, System.MidpointRounding mode)
{
return(System.Math.Round(value, digits, mode));
}
/// <inheritdoc cref="System.Math.Round(System.Decimal, System.MidpointRounding)" />
public static System.Decimal Round(this System.Decimal d, System.MidpointRounding mode)
{
return(System.Math.Round(d, mode));
}
