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osu-lazer/osu.Game.Rulesets.Catch/Edit/CatchDistanceSnapGrid.cs

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C#
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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;
using System.Collections.Generic;
using System.Linq;
using osu.Framework.Allocation;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Lines;
using osu.Framework.Graphics.Primitives;
using osu.Game.Rulesets.Catch.UI;
using osu.Game.Rulesets.Edit;
using osu.Game.Rulesets.UI;
using osu.Game.Rulesets.UI.Scrolling;
using osuTK;
namespace osu.Game.Rulesets.Catch.Edit
{
/// <summary>
/// The guide lines used in the osu!catch editor to compose patterns that can be caught with constant speed.
/// Currently, only forward placement (an object is snapped based on the previous object, not the opposite) is supported.
/// </summary>
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public partial class CatchDistanceSnapGrid : CompositeDrawable
{
public double StartTime { get; set; }
public float StartX { get; set; }
private const double max_vertical_line_length_in_time = CatchPlayfield.WIDTH / Catcher.BASE_WALK_SPEED;
private readonly double[] velocities;
private readonly List<Path> verticalPaths = new List<Path>();
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private readonly List<Vector2[]> verticalLineVertices = new List<Vector2[]>();
[Resolved]
private Playfield playfield { get; set; } = null!;
private ScrollingHitObjectContainer hitObjectContainer => (ScrollingHitObjectContainer)playfield.HitObjectContainer;
public CatchDistanceSnapGrid(double[] velocities)
{
RelativeSizeAxes = Axes.Both;
Anchor = Anchor.BottomLeft;
this.velocities = velocities;
for (int i = 0; i < velocities.Length; i++)
{
verticalPaths.Add(new SmoothPath
{
PathRadius = 2,
Alpha = 0.5f,
});
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verticalLineVertices.Add(new[] { Vector2.Zero, Vector2.Zero });
}
AddRangeInternal(verticalPaths);
}
protected override void Update()
{
base.Update();
double currentTime = hitObjectContainer.Time.Current;
for (int i = 0; i < velocities.Length; i++)
{
double velocity = velocities[i];
// The line ends at the top of the playfield.
double endTime = hitObjectContainer.TimeAtPosition(-hitObjectContainer.DrawHeight, currentTime);
// Non-vertical lines are cut at the sides of the playfield.
// Vertical lines are cut at some reasonable length.
if (velocity > 0)
endTime = Math.Min(endTime, StartTime + (CatchPlayfield.WIDTH - StartX) / velocity);
else if (velocity < 0)
endTime = Math.Min(endTime, StartTime + StartX / -velocity);
else
endTime = Math.Min(endTime, StartTime + max_vertical_line_length_in_time);
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Vector2[] lineVertices = verticalLineVertices[i];
lineVertices[0] = calculatePosition(velocity, StartTime);
lineVertices[1] = calculatePosition(velocity, endTime);
var verticalPath = verticalPaths[i];
verticalPath.Vertices = verticalLineVertices[i];
verticalPath.OriginPosition = verticalPath.PositionInBoundingBox(Vector2.Zero);
}
Vector2 calculatePosition(double velocity, double time)
{
// Don't draw inverted lines.
time = Math.Max(time, StartTime);
float x = StartX + (float)((time - StartTime) * velocity);
float y = hitObjectContainer.PositionAtTime(time, currentTime);
return new Vector2(x, y);
}
}
public SnapResult? GetSnappedPosition(Vector2 screenSpacePosition)
{
double time = hitObjectContainer.TimeAtScreenSpacePosition(screenSpacePosition);
// If the cursor is below the distance snap grid, snap to the origin.
// Not returning `null` to retain the continuous snapping behavior when the cursor is slightly below the origin.
// This behavior is not currently visible in the editor because editor chooses the snap start time based on the mouse position.
if (time <= StartTime)
{
float y = hitObjectContainer.PositionAtTime(StartTime);
Vector2 originPosition = hitObjectContainer.ToScreenSpace(new Vector2(StartX, y));
return new SnapResult(originPosition, StartTime);
}
return enumerateSnappingCandidates(time).MinBy(pos => Vector2.DistanceSquared(screenSpacePosition, pos.ScreenSpacePosition));
}
private IEnumerable<SnapResult> enumerateSnappingCandidates(double time)
{
float y = hitObjectContainer.PositionAtTime(time);
foreach (double velocity in velocities)
{
float x = (float)(StartX + (time - StartTime) * velocity);
Vector2 screenSpacePosition = hitObjectContainer.ToScreenSpace(new Vector2(x, y + hitObjectContainer.DrawHeight));
yield return new SnapResult(screenSpacePosition, time);
}
}
protected override bool ComputeIsMaskedAway(RectangleF maskingBounds) => false;
}
}