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osu-lazer/osu.Game/Screens/Edit/BindableBeatDivisor.cs

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// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
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using System;
using System.Linq;
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using osu.Framework.Bindables;
using osu.Game.Graphics;
using osuTK.Graphics;
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namespace osu.Game.Screens.Edit
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{
public class BindableBeatDivisor : BindableInt
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{
public static readonly int[] VALID_DIVISORS = { 1, 2, 3, 4, 6, 8, 12, 16 };
public BindableBeatDivisor(int value = 1)
: base(value)
{
}
public void Next() => Value = VALID_DIVISORS[Math.Min(VALID_DIVISORS.Length - 1, Array.IndexOf(VALID_DIVISORS, Value) + 1)];
public void Previous() => Value = VALID_DIVISORS[Math.Max(0, Array.IndexOf(VALID_DIVISORS, Value) - 1)];
public override int Value
{
get => base.Value;
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set
{
if (!VALID_DIVISORS.Contains(value))
{
// If it doesn't match, value will be 0, but will be clamped to the valid range via DefaultMinValue
value = Array.FindLast(VALID_DIVISORS, d => d < value);
}
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base.Value = value;
}
}
protected override int DefaultMinValue => VALID_DIVISORS.First();
protected override int DefaultMaxValue => VALID_DIVISORS.Last();
protected override int DefaultPrecision => 1;
protected override Bindable<int> CreateInstance() => new BindableBeatDivisor();
/// <summary>
/// Retrieves the appropriate colour for a beat divisor.
/// </summary>
/// <param name="beatDivisor">The beat divisor.</param>
/// <param name="colours">The set of colours.</param>
/// <returns>The applicable colour from <paramref name="colours"/> for <paramref name="beatDivisor"/>.</returns>
public static Color4 GetColourFor(int beatDivisor, OsuColour colours)
{
switch (beatDivisor)
{
case 1:
return Color4.White;
case 2:
return colours.Red;
case 4:
return colours.Blue;
case 8:
return colours.Yellow;
case 16:
return colours.PurpleDark;
case 3:
return colours.Purple;
case 6:
return colours.YellowDark;
case 12:
return colours.YellowDarker;
default:
return Color4.Red;
}
}
/// <summary>
/// Retrieves the applicable divisor for a specific beat index.
/// </summary>
/// <param name="index">The 0-based beat index.</param>
/// <param name="beatDivisor">The beat divisor.</param>
/// <returns>The applicable divisor.</returns>
public static int GetDivisorForBeatIndex(int index, int beatDivisor)
{
int beat = index % beatDivisor;
foreach (int divisor in BindableBeatDivisor.VALID_DIVISORS)
{
if ((beat * divisor) % beatDivisor == 0)
return divisor;
}
return 0;
}
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}
}