RoundFormPainter.cs

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using System;
using System.Collections.Generic;
using System.Text;

//其它命名空间
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace Tools
{
    public static class RoundFormPainter
    {
        public static void Paint(this object sender, PaintEventArgs e)
        {
            Form form = ((Form)sender);
            List<Point> list = new List<Point>();
            int width = form.Width;
            int height = form.Height;

            //左上
            list.Add(new Point(0, 5));
            list.Add(new Point(1, 5));
            list.Add(new Point(1, 3));
            list.Add(new Point(2, 3));
            list.Add(new Point(2, 2));
            list.Add(new Point(3, 2));
            list.Add(new Point(3, 1));
            list.Add(new Point(5, 1));
            list.Add(new Point(5, 0));
            //右上
            list.Add(new Point(width - 5, 0));
            list.Add(new Point(width - 5, 1));
            list.Add(new Point(width - 3, 1));
            list.Add(new Point(width - 3, 2));
            list.Add(new Point(width - 2, 2));
            list.Add(new Point(width - 2, 3));
            list.Add(new Point(width - 1, 3));
            list.Add(new Point(width - 1, 5));
            list.Add(new Point(width - 0, 5));
            //右下
            list.Add(new Point(width - 0, height - 5));
            list.Add(new Point(width - 1, height - 5));
            list.Add(new Point(width - 1, height - 3));
            list.Add(new Point(width - 2, height - 3));
            list.Add(new Point(width - 2, height - 2));
            list.Add(new Point(width - 3, height - 2));
            list.Add(new Point(width - 3, height - 1));
            list.Add(new Point(width - 5, height - 1));
            list.Add(new Point(width - 5, height - 0));
            //左下
            list.Add(new Point(5, height - 0));
            list.Add(new Point(5, height - 1));
            list.Add(new Point(3, height - 1));
            list.Add(new Point(3, height - 2));
            list.Add(new Point(2, height - 2));
            list.Add(new Point(2, height - 3));
            list.Add(new Point(1, height - 3));
            list.Add(new Point(1, height - 5));
            list.Add(new Point(0, height - 5));