using OpenTK.Graphics.OpenGL;
using OpenTK.Mathematics;
using OpenTK.Windowing.Common;
using System.Drawing;

namespace Yw.WinFrmUI.Hydro
{
    /// <summary>
    /// 绘制水泵2d辅助类
    /// </summary>
    internal static class DrawPump2dExtensions
    {
        /// <summary>
        /// 绘制水源
        /// </summary>
        public static void Draw2d(this PumpL3d pump, float zoom)
        {
            var width = pump.Style2d.Normal.Width;
            var color = pump.Style2d.Normal.Color;
            if (pump.IsSelected)
            {
                width = pump.Style2d.Selected.Width;
                color = pump.Style2d.Selected.Color;
            }
            if (pump.IsHovered)
            {
                width = pump.Style2d.Hovered.Width;
                color = pump.Style2d.Hovered.Color;
            }

            Draw2dHelper.DrawLine(width, color, pump.StartPosition, pump.EndPosition);

            var start = new Vector3(pump.StartPosition.X, pump.StartPosition.Y, pump.StartPosition.Z);
            var end = new Vector3(pump.EndPosition.X, pump.EndPosition.Y, pump.EndPosition.Z);
            var middle = (start + end) / 2f;
            var direction = (start - middle).Normalized();
            var circle = middle + direction * (width * zoom * 2f);
            Draw2dHelper.DrawPoint(width * 4f, color, circle);


            direction = (end - circle).Normalized();

            var rect = circle + direction * (width * zoom * 4f);

            // 选择一个辅助向量（这里选择 Y 轴正方向）
            Vector3 up = Vector3.UnitY;
            if (MathHelper.Abs(Vector3.Dot(direction, up)) > 0.99f)
            {
                up = Vector3.UnitZ;
            }

            // 计算垂直于线段方向的向量（即左侧方向）
            Vector3 leftDirection = Vector3.Cross(direction, up).Normalized();

            // 计算矩形的四个顶点
            Vector3 rectTopLeft = circle + leftDirection * (width * zoom);
            Vector3 rectTopRight = rect + leftDirection * (width * zoom);
            Vector3 rectBottomLeft = circle;
            Vector3 rectBottomRight = rect;

            // 绘制矩形
            Draw2dHelper.DrawRectangle(rectTopLeft, rectTopRight, rectBottomRight, rectBottomLeft, color);


        }












    }


}