Meegu_Run_Class/PolygonExchange.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;

namespace Meegu_Run_Class
{
    /// <summary>
    /// 图形转换
    /// </summary>
    public static class PolygonExchange
    {

        /// <summary>
        /// 获取重心
        /// </summary>
        public static PointF GetMidpoint(PointF[] point)
        {
            float x = 0;
            float y = 0;
            for (int i = 0; i < point.Length; i++)
            {
                x += point[i].X;
                y += point[i].Y;
            }
            return new PointF(x / point.Length, y / point.Length);
        }

        /// <summary>
        /// 旋转
        /// </summary>
        /// <param name="angle">角度</param>
        /// <param name="mid">参考点</param>
        /// <param name="points">点集</param>
        /// <returns></returns>
        public static PointF[] Rotation(int angle, PointF mid, PointF[] points)
        {
            double exAngle = angle * Math.PI / 180;

            points = Translation(points, mid);
            for (int i = 0; i < points.Length; i++)
            {
                float x = (float)(points[i].X * Math.Cos(exAngle) + points[i].Y * Math.Sin(exAngle));
                float y = (float)(-(points[i].X * Math.Sin(exAngle)) + points[i].Y * Math.Cos(exAngle));
                points[i] = new PointF(x, y);
            }
            return ReTranslation(points, mid);
        }

        /// <summary>
        /// 平移
        /// </summary>
        /// <param name="points">点集</param>
        /// <param name="midPoint">参考点</param>
        /// <returns></returns>
        public static PointF[] Translation(PointF[] points, PointF midPoint)
        {
            for (int i = 0; i < points.Length; i++)
            {