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Find closest distance value to mouse

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OliBomby 2023-12-20 01:48:42 +01:00
parent 22a0bc7d9d
commit 1258a9d378
1 changed files with 55 additions and 5 deletions
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60
osu.Game.Rulesets.Osu/Edit/Blueprints/Sliders/Components/SliderTailPiece.cs
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@ -1,12 +1,15 @@
// 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.Linq;
using osu.Framework.Allocation;
using osu.Framework.Caching;
using osu.Framework.Extensions.Color4Extensions;
using osu.Framework.Input;
using osu.Framework.Input.Events;
using osu.Framework.Utils;
using osu.Game.Graphics;
using osu.Game.Rulesets.Objects;
using osu.Game.Rulesets.Osu.Objects;
using osu.Game.Screens.Edit;
using osuTK;
@ -24,6 +27,8 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
private InputManager inputManager = null!;
private readonly Cached<SliderPath> fullPathCache = new Cached<SliderPath>();
[Resolved(CanBeNull = true)]
private EditorBeatmap? editorBeatmap { get; set; }
@ -33,6 +38,7 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
public SliderTailPiece(Slider slider, SliderPosition position)
: base(slider, position)
{
Slider.Path.ControlPoints.CollectionChanged += (_, _) => fullPathCache.Invalidate();
}
protected override void LoadComplete()
@ -78,17 +84,18 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
protected override void OnDrag(DragEvent e)
{
double proposedDistance = Slider.Path.Distance + e.Delta.X;
double oldDistance = Slider.Path.Distance;
double proposedDistance = findClosestPathDistance(e);
proposedDistance = MathHelper.Clamp(proposedDistance, 0, Slider.Path.CalculatedDistance);
proposedDistance = MathHelper.Clamp(proposedDistance,
0.1 * Slider.Path.Distance / Slider.SliderVelocityMultiplier,
10 * Slider.Path.Distance / Slider.SliderVelocityMultiplier);
0.1 * oldDistance / Slider.SliderVelocityMultiplier,
10 * oldDistance / Slider.SliderVelocityMultiplier);
if (Precision.AlmostEquals(proposedDistance, Slider.Path.Distance))
if (Precision.AlmostEquals(proposedDistance, oldDistance))
return;
Slider.SliderVelocityMultiplier *= proposedDistance / Slider.Path.Distance;
Slider.SliderVelocityMultiplier *= proposedDistance / oldDistance;
Slider.Path.ExpectedDistance.Value = proposedDistance;
editorBeatmap?.Update(Slider);
}
@ -100,5 +107,48 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
editorBeatmap?.EndChange();
}
}
/// <summary>
/// Finds the expected distance value for which the slider end is closest to the mouse position.
/// </summary>
private double findClosestPathDistance(DragEvent e)
{
const double step1 = 10;
const double step2 = 0.1;
var desiredPosition = e.MousePosition - Slider.Position;
if (!fullPathCache.IsValid)
fullPathCache.Value = new SliderPath(Slider.Path.ControlPoints.ToArray());
// Do a linear search to find the closest point on the path to the mouse position.
double bestValue = 0;
double minDistance = double.MaxValue;
for (double d = 0; d <= fullPathCache.Value.CalculatedDistance; d += step1)
{
double t = d / fullPathCache.Value.CalculatedDistance;
float dist = Vector2.Distance(fullPathCache.Value.PositionAt(t), desiredPosition);
if (dist >= minDistance) continue;
minDistance = dist;
bestValue = d;
}
// Do another linear search to fine-tune the result.
for (double d = bestValue - step1; d <= bestValue + step1; d += step2)
{
double t = d / fullPathCache.Value.CalculatedDistance;
float dist = Vector2.Distance(fullPathCache.Value.PositionAt(t), desiredPosition);
if (dist >= minDistance) continue;
minDistance = dist;
bestValue = d;
}
return bestValue;
}
}
}