using StgSharp.Graphics;
using StgSharp.Math;

namespace StgSharp.Geometries
{
    /// <summary>
    /// 平面几何体。包含三角形，对称四边形，自由多边形等。最多可由16个点参数定义。
    /// </summary>
    public abstract class PlainGeometry
    {
        protected TimeProvider time;

        internal PartialPlainCoordinate coordinate;
        internal Matrix2x4 textureFrame;

        public PartialPlainCoordinate ReferenceCoordinate
        {
            get => this.coordinate;
        }

        /// <summary>
        /// Tick time this geometry eas crested
        /// </summary>
        /// </summary>
        public uint BornTime => time;

        internal abstract int[] Indices { get; }

        public PlainGeometry(Form form)
        {
            time = new TimeProvider(form);
        }

        public PlainGeometry()
        { }

        internal abstract void UpdateCoordinate(uint tick);

        /// <summary>
        /// Get all sides of this <see cref="PlainGeometry"/>.
        /// </summary>
        /// <returns>A array contains all straight <see cref="Line"/>s of current geometry item.</returns>
        public abstract Line[] GetAllSides();

        /// <summary>
        /// Get a flat <see cref="Plain"/> cincide with current geometry.
        /// </summary>
        /// <returns></returns>
        public abstract Plain GetPlain();

        //public abstract Rectangle GetRenderFrame();
    }
}