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osu-lazer/osu.Game.Rulesets.Mania/UI/OrderedHitPolicy.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.
using System.Collections.Generic;
using osu.Framework.Extensions.IEnumerableExtensions;
using osu.Game.Rulesets.Mania.Objects.Drawables;
using osu.Game.Rulesets.Objects;
using osu.Game.Rulesets.Objects.Drawables;
using osu.Game.Rulesets.UI;
namespace osu.Game.Rulesets.Mania.UI
{
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/// <summary>
/// Ensures that only the most recent <see cref="HitObject"/> is hittable, affectionately known as "note lock".
/// </summary>
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public class OrderedHitPolicy
{
private readonly HitObjectContainer hitObjectContainer;
public OrderedHitPolicy(HitObjectContainer hitObjectContainer)
{
this.hitObjectContainer = hitObjectContainer;
}
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/// <summary>
/// Determines whether a <see cref="DrawableHitObject"/> can be hit at a point in time.
/// </summary>
/// <remarks>
/// Only the most recent <see cref="DrawableHitObject"/> can be hit, a previous hitobject's window cannot extend past the next one.
/// </remarks>
/// <param name="hitObject">The <see cref="DrawableHitObject"/> to check.</param>
/// <param name="time">The time to check.</param>
/// <returns>Whether <paramref name="hitObject"/> can be hit at the given <paramref name="time"/>.</returns>
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public bool IsHittable(DrawableHitObject hitObject, double time)
{
var nextObject = hitObjectContainer.AliveObjects.GetNext(hitObject);
return nextObject == null || time < nextObject.HitObject.StartTime;
}
/// <summary>
/// Handles a <see cref="HitObject"/> being hit to potentially miss all earlier <see cref="HitObject"/>s.
/// </summary>
/// <param name="hitObject">The <see cref="HitObject"/> that was hit.</param>
public void HandleHit(DrawableHitObject hitObject)
{
foreach (var obj in enumerateHitObjectsUpTo(hitObject.HitObject.StartTime))
{
if (obj.Judged)
continue;
((DrawableManiaHitObject)obj).MissForcefully();
}
}
private IEnumerable<DrawableHitObject> enumerateHitObjectsUpTo(double targetTime)
{
foreach (var obj in hitObjectContainer.AliveObjects)
{
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if (obj.HitObject.GetEndTime() >= targetTime)
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yield break;
yield return obj;
foreach (var nestedObj in obj.NestedHitObjects)
{
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if (nestedObj.HitObject.GetEndTime() >= targetTime)
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break;
yield return nestedObj;
}
}
}
}
}