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osu-lazer/osu.Game.Rulesets.Osu/OsuDifficulty/Preprocessing/OsuDifficultyHitObject.cs
2017-12-22 21:42:54 +09:00

117 lines
4.5 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 OpenTK;
using osu.Game.Rulesets.Osu.Objects;
namespace osu.Game.Rulesets.Osu.OsuDifficulty.Preprocessing
{
/// <summary>
/// A wrapper around <see cref="OsuHitObject"/> extending it with additional data required for difficulty calculation.
/// </summary>
public class OsuDifficultyHitObject
{
/// <summary>
/// The <see cref="OsuHitObject"/> this <see cref="OsuDifficultyHitObject"/> refers to.
/// </summary>
public OsuHitObject BaseObject { get; }
/// <summary>
/// Normalized distance from the <see cref="OsuHitObject.StackedPosition"/> of the previous <see cref="OsuDifficultyHitObject"/>.
/// </summary>
public double Distance { get; private set; }
/// <summary>
/// Milliseconds elapsed since the StartTime of the previous <see cref="OsuDifficultyHitObject"/>.
/// </summary>
public double DeltaTime { get; private set; }
/// <summary>
/// Number of milliseconds until the <see cref="OsuDifficultyHitObject"/> has to be hit.
/// </summary>
public double TimeUntilHit { get; set; }
private const int normalized_radius = 52;
private readonly double timeRate;
private readonly OsuHitObject[] t;
/// <summary>
/// Initializes the object calculating extra data required for difficulty calculation.
/// </summary>
public OsuDifficultyHitObject(OsuHitObject[] triangle, double timeRate)
{
this.timeRate = timeRate;
t = triangle;
BaseObject = t[0];
setDistances();
setTimingValues();
// Calculate angle here
}
private void setDistances()
{
// We will scale distances by this factor, so we can assume a uniform CircleSize among beatmaps.
double scalingFactor = normalized_radius / BaseObject.Radius;
if (BaseObject.Radius < 30)
{
double smallCircleBonus = Math.Min(30 - BaseObject.Radius, 5) / 50;
scalingFactor *= 1 + smallCircleBonus;
}
Vector2 lastCursorPosition = t[1].StackedPosition;
float lastTravelDistance = 0;
var lastSlider = t[1] as Slider;
if (lastSlider != null)
{
computeSliderCursorPosition(lastSlider);
lastCursorPosition = lastSlider.LazyEndPosition ?? lastCursorPosition;
lastTravelDistance = lastSlider.LazyTravelDistance;
}
Distance = (lastTravelDistance + (BaseObject.StackedPosition - lastCursorPosition).Length) * scalingFactor;
}
private void setTimingValues()
{
// Every timing inverval is hard capped at the equivalent of 375 BPM streaming speed as a safety measure.
DeltaTime = Math.Max(40, (t[0].StartTime - t[1].StartTime) / timeRate);
TimeUntilHit = 450; // BaseObject.PreEmpt;
}
private void computeSliderCursorPosition(Slider slider)
{
if (slider.LazyEndPosition != null)
return;
slider.LazyEndPosition = slider.StackedPosition;
float approxFollowCircleRadius = (float)(slider.Radius * 3);
var computeVertex = new Action<double>(t =>
{
// ReSharper disable once PossibleInvalidOperationException (bugged in current r# version)
var diff = slider.PositionAt(t) - slider.LazyEndPosition.Value;
float dist = diff.Length;
if (dist > approxFollowCircleRadius)
{
// The cursor would be outside the follow circle, we need to move it
diff.Normalize(); // Obtain direction of diff
dist -= approxFollowCircleRadius;
slider.LazyEndPosition += diff * dist;
slider.LazyTravelDistance += dist;
}
});
var scoringTimes = slider.NestedHitObjects.Select(t => t.StartTime);
foreach (var time in scoringTimes)
computeVertex(time);
computeVertex(slider.EndTime);
}
}
}