转 winfrom组件圆角

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Gid_1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Draw(Rectangle rectangle, Graphics g, int _radius, bool cusp, Color begin_color, Color end_color)
        {
            int span = ;
            //抗锯齿
            g.SmoothingMode = SmoothingMode.AntiAlias;
            //渐变填充
            LinearGradientBrush myLinearGradientBrush = new LinearGradientBrush(rectangle, begin_color, end_color, LinearGradientMode.Vertical);
            //画尖角
            if (cusp)
            {
                span = ;
                PointF p1 = new PointF(rectangle.Width - , rectangle.Y + );
                PointF p2 = new PointF(rectangle.Width - , rectangle.Y + );
                PointF p3 = new PointF(rectangle.Width, rectangle.Y + );
                PointF[] ptsArray = { p1, p2, p3 };
                g.FillPolygon(myLinearGradientBrush, ptsArray);
            }
            //填充
            g.FillPath(myLinearGradientBrush, DrawRoundRect(rectangle.X, rectangle.Y, rectangle.Width - span, rectangle.Height-, _radius));
        }
        public static GraphicsPath DrawRoundRect(int x, int y, int width, int height, int radius)
        {
            //四边圆角
            GraphicsPath gp = new GraphicsPath();
            gp.AddArc(x, y, radius, radius, , );
            gp.AddArc(width - radius, y, radius, radius, , );
            gp.AddArc(width - radius, height - radius, radius, radius, , );
            gp.AddArc(x, height - radius, radius, radius, , );
            gp.CloseAllFigures();
            return gp;
        }

        private void panel1_Paint(object sender, PaintEventArgs e)
        {
            Draw(e.ClipRectangle, e.Graphics, ,true, Color.FromArgb(, , ), Color.FromArgb(, , ));
            base.OnPaint(e);
            Graphics g = e.Graphics;
            g.DrawString("其实我是个Panel", new Font("微软雅黑", , FontStyle.Regular), new SolidBrush(Color.White), new PointF(, ));
        }

        private void panel2_Paint(object sender, PaintEventArgs e)
        {
            Draw(e.ClipRectangle, e.Graphics, , false, Color.FromArgb(, , ), Color.FromArgb(, , ));
            base.OnPaint(e);
            Graphics g = e.Graphics;
            g.DrawString("其实我是个Panel", new Font("微软雅黑", , FontStyle.Regular), new SolidBrush(Color.White), new PointF(, ));
        }

        private void button1_Paint(object sender, PaintEventArgs e)
        {
            Draw(e.ClipRectangle, e.Graphics, , false, Color.FromArgb(, , ), Color.FromArgb(, , ));
            base.OnPaint(e);
            Graphics g = e.Graphics;
            g.DrawString("其实我是个按钮", new Font("微软雅黑", , FontStyle.Regular), new SolidBrush(Color.White), new PointF(, ));
        }

        private void label1_Paint(object sender, PaintEventArgs e)
        {
            Draw(e.ClipRectangle, e.Graphics, , false, Color.FromArgb(, , ), Color.FromArgb(, , ));
            base.OnPaint(e);

            Graphics g = e.Graphics;
            g.DrawString("其实我是Label", new Font("微软雅黑", , FontStyle.Regular), new SolidBrush(Color.Black), new PointF(, ));
        }
    }
}