osu/osu.Game.Rulesets.Osu/Objects/Drawables/Connections/FollowPointConnection.cs

165 lines
5.5 KiB
C#

// 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;
using JetBrains.Annotations;
using osu.Framework.Bindables;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Game.Rulesets.Objects;
using osuTK;
namespace osu.Game.Rulesets.Osu.Objects.Drawables.Connections
{
/// <summary>
/// Visualises the <see cref="FollowPoint"/>s between two <see cref="DrawableOsuHitObject"/>s.
/// </summary>
public class FollowPointConnection : CompositeDrawable
{
// Todo: These shouldn't be constants
private const int spacing = 32;
private const double preempt = 800;
public override bool RemoveWhenNotAlive => false;
/// <summary>
/// The start time of <see cref="Start"/>.
/// </summary>
public readonly Bindable<double> StartTime = new BindableDouble();
/// <summary>
/// The <see cref="DrawableOsuHitObject"/> which <see cref="FollowPoint"/>s will exit from.
/// </summary>
[NotNull]
public readonly DrawableOsuHitObject Start;
/// <summary>
/// Creates a new <see cref="FollowPointConnection"/>.
/// </summary>
/// <param name="start">The <see cref="DrawableOsuHitObject"/> which <see cref="FollowPoint"/>s will exit from.</param>
public FollowPointConnection([NotNull] DrawableOsuHitObject start)
{
Start = start;
RelativeSizeAxes = Axes.Both;
StartTime.BindTo(Start.HitObject.StartTimeBindable);
}
protected override void LoadComplete()
{
base.LoadComplete();
bindEvents(Start);
}
private DrawableOsuHitObject end;
/// <summary>
/// The <see cref="DrawableOsuHitObject"/> which <see cref="FollowPoint"/>s will enter.
/// </summary>
[CanBeNull]
public DrawableOsuHitObject End
{
get => end;
set
{
end = value;
if (end != null)
bindEvents(end);
if (IsLoaded)
scheduleRefresh();
else
refresh();
}
}
private void bindEvents(DrawableOsuHitObject drawableObject)
{
drawableObject.HitObject.PositionBindable.BindValueChanged(_ => scheduleRefresh());
drawableObject.HitObject.DefaultsApplied += _ => scheduleRefresh();
}
private void scheduleRefresh()
{
Scheduler.AddOnce(refresh);
}
private void refresh()
{
OsuHitObject osuStart = Start.HitObject;
double startTime = osuStart.GetEndTime();
LifetimeStart = startTime;
OsuHitObject osuEnd = End?.HitObject;
if (osuEnd == null || osuEnd.NewCombo || osuStart is Spinner || osuEnd is Spinner)
{
// ensure we always set a lifetime for full LifetimeManagementContainer benefits
LifetimeEnd = LifetimeStart;
return;
}
Vector2 startPosition = osuStart.StackedEndPosition;
Vector2 endPosition = osuEnd.StackedPosition;
double endTime = osuEnd.StartTime;
Vector2 distanceVector = endPosition - startPosition;
int distance = (int)distanceVector.Length;
float rotation = (float)(Math.Atan2(distanceVector.Y, distanceVector.X) * (180 / Math.PI));
double duration = endTime - startTime;
double? firstTransformStartTime = null;
double finalTransformEndTime = startTime;
int point = 0;
ClearInternal();
for (int d = (int)(spacing * 1.5); d < distance - spacing; d += spacing)
{
float fraction = (float)d / distance;
Vector2 pointStartPosition = startPosition + (fraction - 0.1f) * distanceVector;
Vector2 pointEndPosition = startPosition + fraction * distanceVector;
double fadeOutTime = startTime + fraction * duration;
double fadeInTime = fadeOutTime - preempt;
FollowPoint fp;
AddInternal(fp = new FollowPoint());
fp.Position = pointStartPosition;
fp.Rotation = rotation;
fp.Alpha = 0;
fp.Scale = new Vector2(1.5f * osuEnd.Scale);
firstTransformStartTime ??= fadeInTime;
fp.AnimationStartTime = fadeInTime;
using (fp.BeginAbsoluteSequence(fadeInTime))
{
fp.FadeIn(osuEnd.TimeFadeIn);
fp.ScaleTo(osuEnd.Scale, osuEnd.TimeFadeIn, Easing.Out);
fp.MoveTo(pointEndPosition, osuEnd.TimeFadeIn, Easing.Out);
fp.Delay(fadeOutTime - fadeInTime).FadeOut(osuEnd.TimeFadeIn);
finalTransformEndTime = fadeOutTime + osuEnd.TimeFadeIn;
}
point++;
}
int excessPoints = InternalChildren.Count - point;
for (int i = 0; i < excessPoints; i++)
RemoveInternal(InternalChildren[^1]);
// todo: use Expire() on FollowPoints and take lifetime from them when https://github.com/ppy/osu-framework/issues/3300 is fixed.
LifetimeStart = firstTransformStartTime ?? startTime;
LifetimeEnd = finalTransformEndTime;
}
}
}