Puppet2D.Engine/Geometry/Polygon.cs - master - EugenyCh7/Puppet2D.Net

Puppet2D.Engine/Geometry/Polygon.cs
74 строки2 KB
Eugeny Chekmarev
exceptions fix
25 авг 2025, 12:46
25 авг 2025, 12:4635e565f
using Puppet2D.System;
using System;
using System.IO;

namespace Puppet2D.Engine.Geometry
{
    /// <summary>
    /// A solid convex polygon.
    /// </summary>
    public struct Polygon
    {
        public float Angle;
        public float OuterRadius;
        public Vector2[] Points;

        internal Polygon(B2.ShapeProxy shapeProxy)
        {
            OuterRadius = shapeProxy.radius;
            Points = new Vector2[shapeProxy.count];
            for (int i = 0; i < shapeProxy.count; i++)
            {
                Points[i] = shapeProxy.points[i];
            }
        }

        internal Polygon(B2.Polygon polygon)
        {
            OuterRadius = polygon.radius;
            Points = new Vector2[polygon.count];
            for (int i = 0; i < polygon.count; i++)
            {
                Points[i] = polygon.vertices[i];
            }
        }

        internal B2.ShapeProxy CastToShapeProxy()
        {
            if (Points == null)
                throw new NullReferenceException($"The {nameof(Points)} is null.");
            if (Points.Length > 8 || Points.Length < 3)
                throw new InvalidDataException($"The number of {nameof(Points)} should be from 3 to 8.");
            B2.ShapeProxy shapeProxy = new B2.ShapeProxy
            {
                count = Points.Length,
                radius = OuterRadius
            };
            for (int i = 0; i < Points.Length; i++)
            {
                shapeProxy.points[i] = Points[i].Rotate(Angle);
            }
            return shapeProxy;
        }

        internal B2.Polygon CastToPolygon()
        {
            unsafe
            {
                if (Points == null)
                    throw new NullReferenceException($"The {nameof(Points)} is null.");
                if (Points.Length > 8 || Points.Length < 3)
                    throw new InvalidDataException($"The number of {nameof(Points)} should be from 3 to 8.");
                B2.Hull hull = new B2.Hull()
                {
                    count = Points.Length
                };
                for (int i = 0; i < Points.Length; i++)
                {
                    hull.points[i] = Points[i].Rotate(Angle);
                }
                return B2.MakePolygon(&hull, OuterRadius);
            }
        }
    }
}