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

namespace IOM_cs
{
    class SetRadius : Form
    {
        private int _Radius;  // 圆角弧度
        /// <summary>圆角弧度(0为不要圆角)</summary>
        //[Browsable(true)]
        //[Description("圆角弧度(0为不要圆角)")]
        public int _setRoundRadius//设置圆角弧度
        {
            get
            {
                return _Radius;
            }
            set
            {
                if (value < 0) { _Radius = 0; }
                else { _Radius = value; }
                base.Refresh();
            }
        }
        // 圆角代码
        public Region Round(int width, int height)
        {
            System.Drawing.Drawing2D.GraphicsPath oPath = new System.Drawing.Drawing2D.GraphicsPath();
            int x = 1;
            int y = 1;
            int thisWidth = width;
            int thisHeight = height;
            int angle = _Radius;
            if (angle > 0)
            {
                System.Drawing.Graphics g = CreateGraphics();
                oPath.AddArc(x, y, angle, angle, 180, 90);                                 // 左上角
                oPath.AddArc(thisWidth - angle, y, angle, angle, 270, 90);                 // 右上角
                oPath.AddArc(thisWidth - angle-1, thisHeight - angle-1, angle, angle, 0, 90);  // 右下角
                oPath.AddArc(x, thisHeight - angle, angle, angle, 90, 90);                 // 左下角

                oPath.CloseAllFigures();
                return new System.Drawing.Region(oPath);
            }
            // -----------------------------------------------------------------------------------------------
            else
            {
                oPath.AddLine(x + angle, y, thisWidth - angle, y);                         // 顶端
                oPath.AddLine(thisWidth, y + angle, thisWidth, thisHeight - angle);        // 右边
                oPath.AddLine(thisWidth - angle, thisHeight, x + angle, thisHeight);       // 底边
                oPath.AddLine(x, y + angle, x, thisHeight - angle);                        // 左边
                oPath.CloseAllFigures();
                return new System.Drawing.Region(oPath);
            }
        }
    }
}