using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace AIStudio.Wpf.DiagramDesigner
{
    public static class DrawingHelper
    {
        public static List<Point> GetPoints(Point startPoint, double angle, List<Tuple<double, double>> angleAndWidth)
        {
            List<Point> points = new List<Point>();
            points.Add(startPoint);

            Point thisPoint= startPoint;           
            double thisAngle = angle;

            Point nextPoint;
            foreach (var item in angleAndWidth)
            {
                nextPoint = GetEndPointByTrigonometric(thisPoint, thisAngle, item.Item1);
                //if (thisPoint != nextPoint)
                {
                    points.Add(nextPoint);
                }

                thisPoint = nextPoint;
                thisAngle = thisAngle + item.Item2;
            }


            return points;
        }


        /// <summary>
        /// 通过三角函数求终点坐标
        /// </summary>
        /// <param name="angle">角度</param>
        /// <param name="startPoint">起点</param>
        /// <param name="distance">距离</param>
        /// <returns>终点坐标</returns>
        public static Point GetEndPointByTrigonometric(Point startPoint, double angle,  double distance)
        {
            //角度转弧度
            var radian = (angle * Math.PI) / 180;

            //计算新坐标 r 就是两者的距离
            Point endPoint = new Point(startPoint.X + distance * Math.Cos(radian), startPoint.Y + distance * Math.Sin(radian));

            return endPoint;
        }

    }
}