Exemplo n.º 1
0
        // GJK using Voronoi regions (Christer Ericson) and Barycentric coordinates.

        /// <summary>
        /// Initialize the proxy using the given shape. The shape
        /// must remain in scope while the proxy is in use.
        /// </summary>
        /// <param name="shape">The shape.</param>
        /// <param name="index">The index.</param>
        public void Set(Shape shape, int index)
        {
            switch (shape.ShapeType)
            {
            case ShapeType.Circle:
            {
                CircleShape circle = (CircleShape)shape;
                Vertices.Clear();
                Vertices.Add(circle.Position);
                Radius = circle.Radius;
            }
            break;

            case ShapeType.Polygon:
            {
                PolygonShape polygon = (PolygonShape)shape;
                Vertices.Clear();
                for (int i = 0; i < polygon.Vertices.Count; i++)
                {
                    Vertices.Add(polygon.Vertices[i]);
                }
                Radius = polygon.Radius;
            }
            break;

            case ShapeType.Chain:
            {
                ChainShape chain = (ChainShape)shape;
                Debug.Assert(0 <= index && index < chain.Vertices.Count);
                Vertices.Clear();
                Vertices.Add(chain.Vertices[index]);
                Vertices.Add(index + 1 < chain.Vertices.Count ? chain.Vertices[index + 1] : chain.Vertices[0]);

                Radius = chain.Radius;
            }
            break;

            case ShapeType.Edge:
            {
                EdgeShape edge = (EdgeShape)shape;
                Vertices.Clear();
                Vertices.Add(edge.Vertex1);
                Vertices.Add(edge.Vertex2);
                Radius = edge.Radius;
            }
            break;

            default:
                Debug.Assert(false);
                break;
            }
        }