forked from MoonsideGames/MoonWorks
84 lines
2.1 KiB
C#
84 lines
2.1 KiB
C#
using System.Collections.Generic;
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using MoonWorks.Math.Fixed;
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namespace MoonWorks.Collision.Fixed
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{
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/// <summary>
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/// A line is a shape defined by exactly two points in space.
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/// </summary>
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public struct Line : IShape2D, System.IEquatable<Line>
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{
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public Vector2 Start { get; }
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public Vector2 End { get; }
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public AABB2D AABB { get; }
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public IEnumerable<IShape2D> Shapes
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{
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get
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{
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yield return this;
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}
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}
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public Line(Vector2 start, Vector2 end)
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{
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Start = start;
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End = end;
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AABB = new AABB2D(
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Fix64.Min(Start.X, End.X),
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Fix64.Min(Start.Y, End.Y),
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Fix64.Max(Start.X, End.X),
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Fix64.Max(Start.Y, End.Y)
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);
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}
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public Vector2 Support(Vector2 direction, Transform2D transform)
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{
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var transformedStart = Vector2.Transform(Start, transform.TransformMatrix);
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var transformedEnd = Vector2.Transform(End, transform.TransformMatrix);
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return Vector2.Dot(transformedStart, direction) > Vector2.Dot(transformedEnd, direction) ?
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transformedStart :
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transformedEnd;
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}
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public AABB2D TransformedAABB(Transform2D transform)
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{
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return AABB2D.Transformed(AABB, transform);
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}
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public override bool Equals(object obj)
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{
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return obj is IShape2D other && Equals(other);
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}
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public bool Equals(IShape2D other)
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{
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return other is Line otherLine && Equals(otherLine);
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}
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public bool Equals(Line other)
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{
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return
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(Start == other.Start && End == other.End) ||
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(End == other.Start && Start == other.End);
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}
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public override int GetHashCode()
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{
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return System.HashCode.Combine(Start, End);
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}
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public static bool operator ==(Line a, Line b)
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{
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return a.Equals(b);
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}
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public static bool operator !=(Line a, Line b)
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{
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return !(a == b);
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}
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}
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}
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