osu/osu.Game/Beatmaps/BeatmapDifficulty.cs

43 lines
2.0 KiB
C#

// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
using System.ComponentModel.DataAnnotations.Schema;
namespace osu.Game.Beatmaps
{
public class BeatmapDifficulty
{
/// <summary>
/// The default value used for all difficulty settings except <see cref="SliderMultiplier"/> and <see cref="SliderTickRate"/>.
/// </summary>
public const float DEFAULT_DIFFICULTY = 5;
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int ID { get; set; }
public float DrainRate { get; set; } = DEFAULT_DIFFICULTY;
public float CircleSize { get; set; } = DEFAULT_DIFFICULTY;
public float OverallDifficulty { get; set; } = DEFAULT_DIFFICULTY;
public float ApproachRate { get; set; } = DEFAULT_DIFFICULTY;
public float SliderMultiplier { get; set; } = 1;
public float SliderTickRate { get; set; } = 1;
/// <summary>
/// Maps a difficulty value [0, 10] to a two-piece linear range of values.
/// </summary>
/// <param name="difficulty">The difficulty value to be mapped.</param>
/// <param name="min">Minimum of the resulting range which will be achieved by a difficulty value of 0.</param>
/// <param name="mid">Midpoint of the resulting range which will be achieved by a difficulty value of 5.</param>
/// <param name="max">Maximum of the resulting range which will be achieved by a difficulty value of 10.</param>
/// <returns>Value to which the difficulty value maps in the specified range.</returns>
public static double DifficultyRange(double difficulty, double min, double mid, double max)
{
if (difficulty > 5)
return mid + (max - mid) * (difficulty - 5) / 5;
if (difficulty < 5)
return mid - (mid - min) * (5 - difficulty) / 5;
return mid;
}
}
}