osu/osu.Game.Rulesets.Mania/Replays/ManiaAutoGenerator.cs
2017-09-12 16:14:52 +09:00

134 lines
5.1 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;
using System.Linq;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Mania.Objects;
using osu.Game.Rulesets.Objects.Types;
using osu.Game.Rulesets.Replays;
using osu.Game.Users;
namespace osu.Game.Rulesets.Mania.Replays
{
internal class ManiaAutoGenerator : AutoGenerator<ManiaHitObject>
{
private const double release_delay = 20;
private readonly int availableColumns;
public ManiaAutoGenerator(Beatmap<ManiaHitObject> beatmap, int availableColumns)
: base(beatmap)
{
this.availableColumns = availableColumns;
Replay = new Replay { User = new User { Username = @"Autoplay" } };
}
protected Replay Replay;
public override Replay Generate()
{
// Todo: Realistically this shouldn't be needed, but the first frame is skipped with the way replays are currently handled
Replay.Frames.Add(new ReplayFrame(-100000, null, null, ReplayButtonState.None));
double[] holdEndTimes = new double[availableColumns];
for (int i = 0; i < availableColumns; i++)
holdEndTimes[i] = double.NegativeInfinity;
// Notes are handled row-by-row
foreach (var objGroup in Beatmap.HitObjects.GroupBy(h => h.StartTime))
{
double groupTime = objGroup.Key;
int activeColumns = 0;
// Get the previously held-down active columns
for (int i = 0; i < availableColumns; i++)
{
if (holdEndTimes[i] > groupTime)
activeColumns |= 1 << i;
}
// Add on the group columns, keeping track of the held notes for the next rows
foreach (var obj in objGroup)
{
var holdNote = obj as HoldNote;
if (holdNote != null)
holdEndTimes[obj.Column] = Math.Max(holdEndTimes[obj.Column], holdNote.EndTime);
activeColumns |= 1 << obj.Column;
}
Replay.Frames.Add(new ReplayFrame(groupTime, activeColumns, null, ReplayButtonState.None));
// Add the release frames. We can't do this with the loop above because we need activeColumns to be fully populated
foreach (var obj in objGroup.GroupBy(h => (h as IHasEndTime)?.EndTime ?? h.StartTime + release_delay).OrderBy(h => h.Key))
{
var groupEndTime = obj.Key;
int activeColumnsAtEnd = 0;
for (int i = 0; i < availableColumns; i++)
{
if (holdEndTimes[i] > groupEndTime)
activeColumnsAtEnd |= 1 << i;
}
Replay.Frames.Add(new ReplayFrame(groupEndTime, activeColumnsAtEnd, 0, ReplayButtonState.None));
}
}
Replay.Frames = Replay.Frames
// Pick the maximum activeColumns for all frames at the same time
.GroupBy(f => f.Time)
.Select(g => new ReplayFrame(g.First().Time, maxMouseX(g), 0, ReplayButtonState.None))
// The addition of release frames above maybe result in unordered frames, but we need them ordered
.OrderBy(f => f.Time)
.ToList();
return Replay;
}
/// <summary>
/// Finds the maximum <see cref="ReplayFrame.MouseX"/> by count of bits from a grouping of <see cref="ReplayFrame"/>s.
/// </summary>
/// <param name="group">The <see cref="ReplayFrame"/> grouping to search.</param>
/// <returns>The maximum <see cref="ReplayFrame.MouseX"/> by count of bits.</returns>
private float maxMouseX(IGrouping<double, ReplayFrame> group)
{
int currentCount = -1;
int currentMax = 0;
foreach (var val in group)
{
int newCount = countBits((int)(val.MouseX ?? 0));
if (newCount > currentCount)
{
currentCount = newCount;
currentMax = (int)(val.MouseX ?? 0);
}
}
return currentMax;
}
/// <summary>
/// Counts the number of bits set in a value.
/// </summary>
/// <param name="value">The value to count.</param>
/// <returns>The number of set bits.</returns>
private int countBits(int value)
{
int count = 0;
while (value > 0)
{
if ((value & 1) > 0)
count++;
value >>= 1;
}
return count;
}
}
}