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https://github.com/ppy/osu
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Guard against empty range in PositionRange
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parent
7b6981c632
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@ -8,14 +8,15 @@ using System;
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namespace osu.Game.Rulesets.Catch.Edit
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{
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/// <summary>
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/// Represents a closed interval of horizontal positions in the playfield.
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/// Represents either the empty range or a closed interval of horizontal positions in the playfield.
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/// A <see cref="PositionRange"/> represents a closed interval if it is <see cref="Min"/> <= <see cref="Max"/>, and represents the empty range otherwise.
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/// </summary>
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public readonly struct PositionRange
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{
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public readonly float Min;
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public readonly float Max;
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public float Length => Max - Min;
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public float Length => Math.Max(0, Max - Min);
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public PositionRange(float value)
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: this(value, value)
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@ -30,7 +31,11 @@ namespace osu.Game.Rulesets.Catch.Edit
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public static PositionRange Union(PositionRange a, PositionRange b) => new PositionRange(Math.Min(a.Min, b.Min), Math.Max(a.Max, b.Max));
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public float GetFlippedPosition(float x) => Max - (x - Min);
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/// <summary>
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/// Get the given position flipped (mirrored) for the axis at the center of this range.
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/// Returns the given position unchanged if the range was empty.
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/// </summary>
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public float GetFlippedPosition(float x) => Min <= Max ? Max - (x - Min) : x;
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public static readonly PositionRange EMPTY = new PositionRange(float.PositiveInfinity, float.NegativeInfinity);
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}
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