C# JackLib系列之GdiHelper圆角矩形的快速生成

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace JackLib.GdiHelper {

    /// <summary>
    /// GdiHelper
    /// </summary>
    public class GdiHelper {
        /// <summary>
        /// 获取圆角矩形
        /// </summary>
        /// <param name="rect">原始矩形</param>
        /// <param name="radius">圆角大小(像素)</param>
        /// <returns></returns>
        public static GraphicsPath GetRoundRectangle(Rectangle rect, int radius) {
            GraphicsPath path = new GraphicsPath();
            Point lefttop = new Point(rect.X, rect.Y);
            Point righttop = new Point(rect.X + rect.Width, rect.Y);
            Point rightbottom = new Point(rect.X + rect.Width, rect.Y + rect.Height);
            Point leftbottom = new Point(rect.X, rect.Y + rect.Height);
            path.AddArc(lefttop.X, lefttop.Y, radius * 2, radius * 2, 180, 90);
            path.AddLine(lefttop.X + radius, lefttop.Y, righttop.X - radius, righttop.Y);
            path.AddArc(righttop.X - radius * 2, righttop.Y, radius * 2, radius * 2, 270, 90);
            path.AddLine(righttop.X, righttop.Y + radius, rightbottom.X, rightbottom.Y - radius);
            path.AddArc(rightbottom.X - radius * 2, rightbottom.Y - radius * 2, radius * 2, radius * 2, 0, 90);
            path.AddLine(rightbottom.X - radius, rightbottom.Y, leftbottom.X + 5, leftbottom.Y);
            path.AddArc(leftbottom.X, leftbottom.Y - radius * 2, radius * 2, radius * 2, 90, 90);
            path.AddLine(lefttop.X, leftbottom.Y - radius, lefttop.X, lefttop.Y + radius);
            path.CloseFigure();
            return path;
        }
    }
}