MoonTools.Bonk/Bonk/Shapes/Rectangle.cs

119 lines
3.3 KiB
C#

using System;
using System.Numerics;
using MoonTools.Core.Structs;
namespace MoonTools.Core.Bonk
{
/// <summary>
/// A rectangle is a shape defined by a width and height. The origin is the center of the rectangle.
/// </summary>
public struct Rectangle : IShape2D, IEquatable<Rectangle>
{
public AABB AABB { get; }
public int Width { get; }
public int Height { get; }
public float Right { get; }
public float Left { get; }
public float Top { get; }
public float Bottom { get; }
public Vector2 BottomLeft { get; }
public Vector2 TopRight { get; }
public Vector2 Min { get; }
public Vector2 Max { get; }
public Rectangle(int left, int top, int width, int height)
{
Width = width;
Height = height;
Left = left;
Right = left + width;
Top = top;
Bottom = top + height;
AABB = new AABB(left, top, Right, Bottom);
BottomLeft = new Vector2(Left, Bottom);
TopRight = new Vector2(Top, Right);
Min = AABB.Min;
Max = AABB.Max;
}
private Vector2 Support(Vector2 direction)
{
if (direction.X >= 0 && direction.Y >= 0)
{
return Max;
}
else if (direction.X >= 0 && direction.Y < 0)
{
return new Vector2(Max.X, Min.Y);
}
else if (direction.X < 0 && direction.Y >= 0)
{
return new Vector2(Min.X, Max.Y);
}
else if (direction.X < 0 && direction.Y < 0)
{
return new Vector2(Min.X, Min.Y);
}
else
{
throw new ArgumentException("Support vector direction cannot be zero.");
}
}
public Vector2 Support(Vector2 direction, Transform2D transform)
{
Matrix3x2 inverseTransform;
Matrix3x2.Invert(transform.TransformMatrix, out inverseTransform);
var inverseDirection = Vector2.TransformNormal(direction, inverseTransform);
return Vector2.Transform(Support(inverseDirection), transform.TransformMatrix);
}
public AABB TransformedAABB(Transform2D transform)
{
return AABB.Transformed(AABB, transform);
}
public override bool Equals(object obj)
{
return obj is IShape2D other && Equals(other);
}
public bool Equals(IShape2D other)
{
return (other is Rectangle rectangle && Equals(rectangle));
}
public bool Equals(Rectangle other)
{
return Min == other.Min && Max == other.Max;
}
public override int GetHashCode()
{
return HashCode.Combine(Min, Max);
}
public static bool operator ==(Rectangle a, Rectangle b)
{
return a.Equals(b);
}
public static bool operator !=(Rectangle a, Rectangle b)
{
return !(a == b);
}
public static bool operator ==(Rectangle a, Polygon b)
{
return a.Equals(b);
}
public static bool operator !=(Rectangle a, Polygon b)
{
return !(a == b);
}
}
}