MoonTools.Bonk/Bonk/Shapes/Rectangle.cs

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using System;
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using System.Collections.Generic;
using System.Linq;
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using System.Numerics;
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using MoonTools.Core.Structs;
namespace MoonTools.Core.Bonk
{
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/// <summary>
/// A rectangle is a shape defined by a minimum and maximum X value and a minimum and maximum Y value.
/// </summary>
public struct Rectangle : IShape2D, IEquatable<Rectangle>
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{
public int MinX { get; }
public int MinY { get; }
public int MaxX { get; }
public int MaxY { get; }
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public IEnumerable<Position2D> Vertices
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{
get
{
yield return new Position2D(MinX, MinY);
yield return new Position2D(MinX, MaxY);
yield return new Position2D(MaxX, MinY);
yield return new Position2D(MaxX, MaxY);
}
}
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public Rectangle(int minX, int minY, int maxX, int maxY)
{
MinX = minX;
MinY = minY;
MaxX = maxX;
MaxY = maxY;
}
public Vector2 Support(Vector2 direction, Transform2D transform)
{
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var maxDotProduct = float.NegativeInfinity;
var maxVertex = new Vector2(MinX, MinY);
foreach (var vertex in Vertices)
{
var transformed = Vector2.Transform(vertex, transform.TransformMatrix);
var dot = Vector2.Dot(transformed, direction);
if (dot > maxDotProduct)
{
maxVertex = transformed;
maxDotProduct = dot;
}
}
return maxVertex;
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}
public AABB AABB(Transform2D Transform2D)
{
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return Bonk.AABB.FromTransformedVertices(Vertices, Transform2D);
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}
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public override bool Equals(object obj)
{
return obj is IShape2D other && Equals(other);
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}
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public bool Equals(IShape2D other)
{
return (other is Rectangle rectangle && Equals(rectangle)) || (other is Polygon polygon && Equals(polygon));
}
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public bool Equals(Rectangle other)
{
return MinX == other.MinX &&
MinY == other.MinY &&
MaxX == other.MaxX &&
MaxY == other.MaxY;
}
public bool Equals(Polygon other)
{
return RectanglePolygonComparison.Equals(other, this);
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}
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public override int GetHashCode()
{
return HashCode.Combine(MinX, MinY, MaxX, MaxY);
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}
public static bool operator ==(Rectangle a, Rectangle b)
{
return a.Equals(b);
}
public static bool operator !=(Rectangle a, Rectangle b)
{
return !(a == b);
}
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}
}