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osu-lazer/osu.Game.Rulesets.Catch/Edit/PositionRange.cs
2022-06-17 16:37:17 +09:00

41 lines
1.4 KiB
C#

// 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;
namespace osu.Game.Rulesets.Catch.Edit
{
/// <summary>
/// Represents either the empty range or a closed interval of horizontal positions in the playfield.
/// A <see cref="PositionRange"/> represents a closed interval if it is <see cref="Min"/> &lt;= <see cref="Max"/>, and represents the empty range otherwise.
/// </summary>
public readonly struct PositionRange
{
public readonly float Min;
public readonly float Max;
public float Length => Math.Max(0, Max - Min);
public PositionRange(float value)
: this(value, value)
{
}
public PositionRange(float min, float max)
{
Min = min;
Max = max;
}
public static PositionRange Union(PositionRange a, PositionRange b) => new PositionRange(Math.Min(a.Min, b.Min), Math.Max(a.Max, b.Max));
/// <summary>
/// Get the given position flipped (mirrored) for the axis at the center of this range.
/// Returns the given position unchanged if the range was empty.
/// </summary>
public float GetFlippedPosition(float x) => Min <= Max ? Max - (x - Min) : x;
public static readonly PositionRange EMPTY = new PositionRange(float.PositiveInfinity, float.NegativeInfinity);
}
}