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Merge pull request #2409 from smoogipoo/fix-overlapping-speedchanges

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Fix hitobject lengths not being calculated for overlapping speed changes
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Dean Herbert 2018-04-20 18:07:02 +09:00 committed by GitHub
commit 45eaa53d01
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4 changed files with 84 additions and 21 deletions
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2
osu.Game/Rulesets/UI/Scrolling/ScrollingHitObjectContainer.cs
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@ -110,7 +110,7 @@ namespace osu.Game.Rulesets.UI.Scrolling
base.UpdateAfterChildrenLife();
// We need to calculate this as soon as possible after lifetimes so that hitobjects get the final say in their positions
speedChangeVisualiser.ComputePositions(AliveObjects, direction, Time.Current, TimeRange, DrawSize);
speedChangeVisualiser.UpdatePositions(AliveObjects, direction, Time.Current, TimeRange, DrawSize);
}
}
}

13
osu.Game/Rulesets/UI/Scrolling/Visualisers/ISpeedChangeVisualiser.cs
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@ -10,24 +10,23 @@ namespace osu.Game.Rulesets.UI.Scrolling.Visualisers
public interface ISpeedChangeVisualiser
{
/// <summary>
/// Computes the states of <see cref="DrawableHitObject"/>s that are constant, such as lifetime and spatial length.
/// Computes the states of <see cref="DrawableHitObject"/>s that remain constant while scrolling, such as lifetime and spatial length.
/// This is invoked once whenever <paramref name="timeRange"/> or <paramref name="length"/> changes.
/// </summary>
/// <param name="hitObjects">The <see cref="DrawableHitObject"/>s whose states should be computed.</param>
/// <param name="direction">The scrolling direction.</param>
/// <param name="timeRange">The duration required to scroll through one length of the screen before any control point adjustments.</param>
/// <param name="timeRange">The duration required to scroll through one length of the screen before any speed adjustments.</param>
/// <param name="length">The length of the screen that is scrolled through.</param>
void ComputeInitialStates(IEnumerable<DrawableHitObject> hitObjects, ScrollingDirection direction, double timeRange, Vector2 length);
/// <summary>
/// Computes the states of <see cref="DrawableHitObject"/>s that change depending on <paramref name="currentTime"/>, such as position.
/// This is invoked once per frame.
/// Updates the positions of <see cref="DrawableHitObject"/>s, depending on the current time. This is invoked once per frame.
/// </summary>
/// <param name="hitObjects">The <see cref="DrawableHitObject"/>s whose states should be computed.</param>
/// <param name="hitObjects">The <see cref="DrawableHitObject"/>s whose positions should be computed.</param>
/// <param name="direction">The scrolling direction.</param>
/// <param name="currentTime">The current time.</param>
/// <param name="timeRange">The duration required to scroll through one length of the screen before any control point adjustments.</param>
/// <param name="timeRange">The duration required to scroll through one length of the screen before any speed adjustments.</param>
/// <param name="length">The length of the screen that is scrolled through.</param>
void ComputePositions(IEnumerable<DrawableHitObject> hitObjects, ScrollingDirection direction, double currentTime, double timeRange, Vector2 length);
void UpdatePositions(IEnumerable<DrawableHitObject> hitObjects, ScrollingDirection direction, double currentTime, double timeRange, Vector2 length);
}
}

57
osu.Game/Rulesets/UI/Scrolling/Visualisers/OverlappingSpeedChangeVisualiser.cs
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@ -4,6 +4,7 @@
using System.Collections.Generic;
using osu.Framework.Lists;
using osu.Game.Rulesets.Objects.Drawables;
using osu.Game.Rulesets.Objects.Types;
using osu.Game.Rulesets.Timing;
using OpenTK;
@ -22,24 +23,45 @@ namespace osu.Game.Rulesets.UI.Scrolling.Visualisers
{
foreach (var obj in hitObjects)
{
var controlPoint = controlPointAt(obj.HitObject.StartTime);
obj.LifetimeStart = obj.HitObject.StartTime - timeRange / controlPoint.Multiplier;
// The total amount of time that the hitobject will remain visible within the timeRange, which decreases as the speed multiplier increases
double visibleDuration = timeRange / controlPointAt(obj.HitObject.StartTime).Multiplier;
obj.LifetimeStart = obj.HitObject.StartTime - visibleDuration;
if (obj.HitObject is IHasEndTime endTime)
{
// At the hitobject's end time, the hitobject will be positioned such that its end rests at the origin.
// This results in a negative-position value, and the absolute of it indicates the length of the hitobject.
var hitObjectLength = -hitObjectPositionAt(obj, endTime.EndTime, timeRange);
switch (direction)
{
case ScrollingDirection.Up:
case ScrollingDirection.Down:
obj.Height = (float)(hitObjectLength * length.Y);
break;
case ScrollingDirection.Left:
case ScrollingDirection.Right:
obj.Width = (float)(hitObjectLength * length.X);
break;
}
}
if (obj.HasNestedHitObjects)
{
ComputeInitialStates(obj.NestedHitObjects, direction, timeRange, length);
ComputePositions(obj.NestedHitObjects, direction, obj.HitObject.StartTime, timeRange, length);
// Nested hitobjects don't need to scroll, but they do need accurate positions
UpdatePositions(obj.NestedHitObjects, direction, obj.HitObject.StartTime, timeRange, length);
}
}
}
public void ComputePositions(IEnumerable<DrawableHitObject> hitObjects, ScrollingDirection direction, double currentTime, double timeRange, Vector2 length)
public void UpdatePositions(IEnumerable<DrawableHitObject> hitObjects, ScrollingDirection direction, double currentTime, double timeRange, Vector2 length)
{
foreach (var obj in hitObjects)
{
var controlPoint = controlPointAt(obj.HitObject.StartTime);
var position = (obj.HitObject.StartTime - currentTime) * controlPoint.Multiplier / timeRange;
var position = hitObjectPositionAt(obj, currentTime, timeRange);
switch (direction)
{
@ -59,7 +81,28 @@ namespace osu.Game.Rulesets.UI.Scrolling.Visualisers
}
}
/// <summary>
/// Computes the position of a <see cref="DrawableHitObject"/> at a point in time.
/// <para>
/// At t &lt; startTime, position &gt; 0. <br />
/// At t = startTime, position = 0. <br />
/// At t &gt; startTime, position &lt; 0.
/// </para>
/// </summary>
/// <param name="obj">The <see cref="DrawableHitObject"/>.</param>
/// <param name="time">The time to find the position of <paramref name="obj"/> at.</param>
/// <param name="timeRange">The amount of time visualised by the scrolling area.</param>
/// <returns>The position of <paramref name="obj"/> in the scrolling area at time = <paramref name="time"/>.</returns>
private double hitObjectPositionAt(DrawableHitObject obj, double time, double timeRange)
=> (obj.HitObject.StartTime - time) / timeRange * controlPointAt(obj.HitObject.StartTime).Multiplier;
private readonly MultiplierControlPoint searchPoint = new MultiplierControlPoint();
/// <summary>
/// Finds the <see cref="MultiplierControlPoint"/> which affects the speed of hitobjects at a specific time.
/// </summary>
/// <param name="time">The time which the <see cref="MultiplierControlPoint"/> should affect.</param>
/// <returns>The <see cref="MultiplierControlPoint"/>.</returns>
private MultiplierControlPoint controlPointAt(double time)
{
if (controlPoints.Count == 0)

33
osu.Game/Rulesets/UI/Scrolling/Visualisers/SequentialSpeedChangeVisualiser.cs
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@ -25,23 +25,25 @@ namespace osu.Game.Rulesets.UI.Scrolling.Visualisers
{
foreach (var obj in hitObjects)
{
// To reduce iterations when updating hitobject positions later on, their initial positions are cached
var startPosition = hitObjectPositions[obj] = positionAt(obj.HitObject.StartTime, timeRange);
// Todo: This is approximate and will be incorrect in the case of extreme speed changes
obj.LifetimeStart = obj.HitObject.StartTime - timeRange - 1000;
if (obj.HitObject is IHasEndTime endTime)
{
var diff = positionAt(endTime.EndTime, timeRange) - startPosition;
var hitObjectLength = positionAt(endTime.EndTime, timeRange) - startPosition;
switch (direction)
{
case ScrollingDirection.Up:
case ScrollingDirection.Down:
obj.Height = (float)(diff * length.Y);
obj.Height = (float)(hitObjectLength * length.Y);
break;
case ScrollingDirection.Left:
case ScrollingDirection.Right:
obj.Width = (float)(diff * length.X);
obj.Width = (float)(hitObjectLength * length.X);
break;
}
}
@ -49,12 +51,14 @@ namespace osu.Game.Rulesets.UI.Scrolling.Visualisers
if (obj.HasNestedHitObjects)
{
ComputeInitialStates(obj.NestedHitObjects, direction, timeRange, length);
ComputePositions(obj.NestedHitObjects, direction, obj.HitObject.StartTime, timeRange, length);
// Nested hitobjects don't need to scroll, but they do need accurate positions
UpdatePositions(obj.NestedHitObjects, direction, obj.HitObject.StartTime, timeRange, length);
}
}
}
public void ComputePositions(IEnumerable<DrawableHitObject> hitObjects, ScrollingDirection direction, double currentTime, double timeRange, Vector2 length)
public void UpdatePositions(IEnumerable<DrawableHitObject> hitObjects, ScrollingDirection direction, double currentTime, double timeRange, Vector2 length)
{
var timelinePosition = positionAt(currentTime, timeRange);
@ -80,21 +84,38 @@ namespace osu.Game.Rulesets.UI.Scrolling.Visualisers
}
}
/// <summary>
/// Finds the position which corresponds to a point in time.
/// This is a non-linear operation that depends on all the control points up to and including the one active at the time value.
/// </summary>
/// <param name="time">The time to find the position at.</param>
/// <param name="timeRange">The amount of time visualised by the scrolling area.</param>
/// <returns>A positive value indicating the position at <paramref name="time"/>.</returns>
private double positionAt(double time, double timeRange)
{
double length = 0;
// We need to consider all timing points until the specified time and not just the currently-active one,
// since each timing point individually affects the positions of _all_ hitobjects after its start time
for (int i = 0; i < controlPoints.Count; i++)
{
var current = controlPoints[i];
var next = i < controlPoints.Count - 1 ? controlPoints[i + 1] : null;
// We don't need to consider any control points beyond the current time, since it will not yet
// affect any hitobjects
if (i > 0 && current.StartTime > time)
continue;
// Duration of the current control point
var currentDuration = (next?.StartTime ?? double.PositiveInfinity) - current.StartTime;
length += Math.Min(currentDuration, time - current.StartTime) * current.Multiplier / timeRange;
// We want to consider the minimal amount of time that this control point has affected,
// which may be either its duration, or the amount of time that has passed within it
var durationInCurrent = Math.Min(currentDuration, time - current.StartTime);
// Figure out how much of the time range the duration represents, and adjust it by the speed multiplier
length += durationInCurrent / timeRange * current.Multiplier;
}
return length;