using System.Windows;
using System.Windows.Media.Media3D;

namespace HelixToolkit
{
    /// <summary>
    /// A sphere defined by center and radius
    /// </summary>
    public class SphereVisual3D : MeshElement3D
    {
        public static readonly DependencyProperty CenterProperty =
            DependencyProperty.Register("Center", typeof(Point3D), typeof(SphereVisual3D),
                                        new PropertyMetadata(new Point3D(0, 0, 0), GeometryChanged));

        public static readonly DependencyProperty PhiDivProperty =
            DependencyProperty.Register("PhiDiv",
                                        typeof(int),
                                        typeof(SphereVisual3D),
                                        new PropertyMetadata(30, GeometryChanged));

        public static readonly DependencyProperty RadiusProperty =
            DependencyProperty.Register("Radius",
                                        typeof(double),
                                        typeof(SphereVisual3D),
                                        new PropertyMetadata(1.0, GeometryChanged));

        public static readonly DependencyProperty ThetaDivProperty =
            DependencyProperty.Register("ThetaDiv",
                                        typeof(int),
                                        typeof(SphereVisual3D),
                                        new PropertyMetadata(60, GeometryChanged));

        /// <summary>
        /// Gets or sets the center of the sphere.
        /// </summary>
        /// <value>The center.</value>
        public Point3D Center
        {
            get { return (Point3D)GetValue(CenterProperty); }
            set { SetValue(CenterProperty, value); }
        }

        /// <summary>
        /// Gets or sets the number of divisions in the theta direction (around the sphere).
        /// </summary>
        /// <value>The theta div.</value>
        public int ThetaDiv
        {
            get { return (int)GetValue(ThetaDivProperty); }

            set { SetValue(ThetaDivProperty, value); }
        }

        /// <summary>
        /// Gets or sets the number of divisions in the phi direction (top-bottom).
        /// </summary>
        /// <value>The phi div.</value>
        public int PhiDiv
        {
            get { return (int)GetValue(PhiDivProperty); }

            set { SetValue(PhiDivProperty, value); }
        }

        /// <summary>
        /// Gets or sets the radius of the sphere.
        /// </summary>
        /// <value>The radius.</value>
        public double Radius
        {
            get { return (double)GetValue(RadiusProperty); }

            set { SetValue(RadiusProperty, value); }
        }

        protected override MeshGeometry3D Tessellate()
        {
            var builder = new MeshBuilder(true, true);
            builder.AddSphere(Center, Radius, ThetaDiv, PhiDiv);
            return builder.ToMesh();
        }
    }
}