MoonTools.Bonk/Bonk/Shapes/Line.cs

57 lines
1.5 KiB
C#

using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
using MoonTools.Core.Structs;
namespace MoonTools.Core.Bonk
{
/// <summary>
/// A line is a shape defined by exactly two points in space.
/// </summary>
public struct Line : IShape2D, IEquatable<IShape2D>
{
private Position2D v0;
private Position2D v1;
private IEnumerable<Position2D> vertices
{
get
{
yield return v0;
yield return v0;
}
}
public Line(Position2D start, Position2D end)
{
v0 = start;
v1 = end;
}
public Vector2 Support(Vector2 direction, Transform2D transform)
{
var TransformedStart = Vector2.Transform(v0, transform.TransformMatrix);
var TransformedEnd = Vector2.Transform(v1, transform.TransformMatrix);
return Vector2.Dot(TransformedStart, direction) > Vector2.Dot(TransformedEnd, direction) ?
TransformedStart :
TransformedEnd;
}
public AABB AABB(Transform2D Transform2D)
{
return Bonk.AABB.FromTransformedVertices(vertices, Transform2D);
}
public bool Equals(IShape2D other)
{
if (other is Line)
{
var otherLine = (Line)other;
return v0.ToVector2() == otherLine.v0.ToVector2() && v1.ToVector2() == otherLine.v1.ToVector2();
}
return false;
}
}
}