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Code Issues Releases Wiki Activity

Extract utility methods into helper class; Better xmldoc and naming

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This commit is contained in:
Henry Lin 2021-06-24 13:19:42 +08:00
parent 8b06dd3302
commit 2268d7f8a5
2 changed files with 102 additions and 77 deletions
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79
osu.Game.Rulesets.Osu/Mods/OsuModRandom.cs
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@ -12,6 +12,7 @@ using osu.Game.Rulesets.Objects;
using osu.Game.Rulesets.Osu.Beatmaps;
using osu.Game.Rulesets.Osu.Objects;
using osu.Game.Rulesets.Osu.UI;
using osu.Game.Rulesets.Osu.Utils;
using osuTK;
namespace osu.Game.Rulesets.Osu.Mods
@ -23,15 +24,6 @@ namespace osu.Game.Rulesets.Osu.Mods
{
public override string Description => "It never gets boring!";
// The relative distance to the edge of the playfield before objects' positions should start to "turn around" and curve towards the middle.
// The closer the hit objects draw to the border, the sharper the turn
private const float playfield_edge_ratio = 0.375f;
private static readonly float border_distance_x = OsuPlayfield.BASE_SIZE.X * playfield_edge_ratio;
private static readonly float border_distance_y = OsuPlayfield.BASE_SIZE.Y * playfield_edge_ratio;
private static readonly Vector2 playfield_middle = OsuPlayfield.BASE_SIZE / 2;
private static readonly float playfield_diagonal = OsuPlayfield.BASE_SIZE.LengthFast;
private Random rng;
@ -113,7 +105,7 @@ namespace osu.Game.Rulesets.Osu.Mods
distanceToPrev * (float)Math.Sin(current.AngleRad)
);
posRelativeToPrev = getRotatedVector(previous.EndPositionRandomised, posRelativeToPrev);
posRelativeToPrev = VectorHelper.RotateAwayFromEdge(previous.EndPositionRandomised, posRelativeToPrev);
current.AngleRad = (float)Math.Atan2(posRelativeToPrev.Y, posRelativeToPrev.X);
@ -185,73 +177,6 @@ namespace osu.Game.Rulesets.Osu.Mods
}
}
/// <summary>
/// Determines the position of the current hit object relative to the previous one.
/// </summary>
/// <returns>The position of the current hit object relative to the previous one</returns>
private Vector2 getRotatedVector(Vector2 prevPosChanged, Vector2 posRelativeToPrev)
{
var relativeRotationDistance = 0f;
if (prevPosChanged.X < playfield_middle.X)
{
relativeRotationDistance = Math.Max(
(border_distance_x - prevPosChanged.X) / border_distance_x,
relativeRotationDistance
);
}
else
{
relativeRotationDistance = Math.Max(
(prevPosChanged.X - (OsuPlayfield.BASE_SIZE.X - border_distance_x)) / border_distance_x,
relativeRotationDistance
);
}
if (prevPosChanged.Y < playfield_middle.Y)
{
relativeRotationDistance = Math.Max(
(border_distance_y - prevPosChanged.Y) / border_distance_y,
relativeRotationDistance
);
}
else
{
relativeRotationDistance = Math.Max(
(prevPosChanged.Y - (OsuPlayfield.BASE_SIZE.Y - border_distance_y)) / border_distance_y,
relativeRotationDistance
);
}
return rotateVectorTowardsVector(posRelativeToPrev, playfield_middle - prevPosChanged, relativeRotationDistance / 2);
}
/// <summary>
/// Rotates vector "initial" towards vector "destinantion"
/// </summary>
/// <param name="initial">Vector to rotate to "destination"</param>
/// <param name="destination">Vector "initial" should be rotated to</param>
/// <param name="relativeDistance">The angle the vector should be rotated relative to the difference between the angles of the the two vectors.</param>
/// <returns>Resulting vector</returns>
private Vector2 rotateVectorTowardsVector(Vector2 initial, Vector2 destination, float relativeDistance)
{
var initialAngleRad = Math.Atan2(initial.Y, initial.X);
var destAngleRad = Math.Atan2(destination.Y, destination.X);
var diff = destAngleRad - initialAngleRad;
while (diff < -Math.PI) diff += 2 * Math.PI;
while (diff > Math.PI) diff -= 2 * Math.PI;
var finalAngleRad = initialAngleRad + relativeDistance * diff;
return new Vector2(
initial.Length * (float)Math.Cos(finalAngleRad),
initial.Length * (float)Math.Sin(finalAngleRad)
);
}
private class RandomObjectInfo
{
public float AngleRad { get; set; }

100
osu.Game.Rulesets.Osu/Utils/VectorHelper.cs Normal file
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@ -0,0 +1,100 @@
// 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 osu.Game.Rulesets.Osu.UI;
using osuTK;
namespace osu.Game.Rulesets.Osu.Utils
{
public static class VectorHelper
{
// The relative distance to the edge of the playfield before objects' positions should start to "turn around" and curve towards the middle.
// The closer the hit objects draw to the border, the sharper the turn
private const float playfield_edge_ratio = 0.375f;
private static readonly float border_distance_x = OsuPlayfield.BASE_SIZE.X * playfield_edge_ratio;
private static readonly float border_distance_y = OsuPlayfield.BASE_SIZE.Y * playfield_edge_ratio;
private static readonly Vector2 playfield_middle = OsuPlayfield.BASE_SIZE / 2;
/// <summary>
/// Rotate a hit object away from the playfield edge, while keeping a constant distance
/// from the previous object.
/// </summary>
/// <remarks>
/// The extent of rotation depends on the position of the hit object. Hit objects
/// closer to the playfield edge will be rotated to a larger extent.
/// </remarks>
/// <param name="prevObjectPos">Position of the previous hit object.</param>
/// <param name="posRelativeToPrev">Position of the hit object to be rotated, relative to the previous hit object.</param>
/// <param name="rotationRatio">
/// The extent of rotation.
/// 0 means the hit object is never rotated.
/// 1 means the hit object will be fully rotated towards playfield center when it is originally at playfield edge.
/// </param>
/// <returns>The new position of the hit object, relative to the previous one.</returns>
public static Vector2 RotateAwayFromEdge(Vector2 prevObjectPos, Vector2 posRelativeToPrev, float rotationRatio = 0.5f)
{
var relativeRotationDistance = 0f;
if (prevObjectPos.X < playfield_middle.X)
{
relativeRotationDistance = Math.Max(
(border_distance_x - prevObjectPos.X) / border_distance_x,
relativeRotationDistance
);
}
else
{
relativeRotationDistance = Math.Max(
(prevObjectPos.X - (OsuPlayfield.BASE_SIZE.X - border_distance_x)) / border_distance_x,
relativeRotationDistance
);
}
if (prevObjectPos.Y < playfield_middle.Y)
{
relativeRotationDistance = Math.Max(
(border_distance_y - prevObjectPos.Y) / border_distance_y,
relativeRotationDistance
);
}
else
{
relativeRotationDistance = Math.Max(
(prevObjectPos.Y - (OsuPlayfield.BASE_SIZE.Y - border_distance_y)) / border_distance_y,
relativeRotationDistance
);
}
return RotateVectorTowardsVector(posRelativeToPrev, playfield_middle - prevObjectPos, relativeRotationDistance * rotationRatio);
}
/// <summary>
/// Rotates vector "initial" towards vector "destination".
/// </summary>
/// <param name="initial">The vector to be rotated.</param>
/// <param name="destination">The vector that "initial" should be rotated towards.</param>
/// <param name="rotationRatio">How much "initial" should be rotated. 0 means no rotation. 1 means "initial" is fully rotated to equal "destination".</param>
/// <returns>The rotated vector.</returns>
public static Vector2 RotateVectorTowardsVector(Vector2 initial, Vector2 destination, float rotationRatio)
{
var initialAngleRad = Math.Atan2(initial.Y, initial.X);
var destAngleRad = Math.Atan2(destination.Y, destination.X);
var diff = destAngleRad - initialAngleRad;
while (diff < -Math.PI) diff += 2 * Math.PI;
while (diff > Math.PI) diff -= 2 * Math.PI;
var finalAngleRad = initialAngleRad + rotationRatio * diff;
return new Vector2(
initial.Length * (float)Math.Cos(finalAngleRad),
initial.Length * (float)Math.Sin(finalAngleRad)
);
}
}
}