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

namespace ButtonImages
{
    class ImageDrawRect
    {
        /// <summary>
        /// 绘图对像
        /// </summary>
        /// <param name="g">绘图对像</param>
        /// <param name="img">图片</param>
        /// <param name="r">绘置的图片大小、坐标</param>
        /// <param name="lr">绘置的图片边界</param>
        /// <param name="index">当前状态</param>
        /// <param name="Totalindex">状态总数</param>
        public static void DrawRect(Graphics g, Bitmap img, Rectangle r, Rectangle lr, int index, int Totalindex)
        {
            if (img == null) return;
            Rectangle r1, r2;
            int x = (index - 1) * img.Width / Totalindex;
            int y = 0;
            int x1 = r.Left;
            int y1 = r.Top;

            if (r.Height > img.Height && r.Width <= img.Width / Totalindex)
            {
                r1 = new Rectangle(x, y, img.Width / Totalindex, lr.Top);
                r2 = new Rectangle(x1, y1, r.Width, lr.Top);
                g.DrawImage(img, r2, r1, GraphicsUnit.Pixel);

                r1 = new Rectangle(x, y + lr.Top, img.Width / Totalindex, img.Height - lr.Top - lr.Bottom);
                r2 = new Rectangle(x1, y1 + lr.Top, r.Width, r.Height - lr.Top - lr.Bottom);
                if ((lr.Top + lr.Bottom) == 0) r1.Height = r1.Height - 1;
                g.DrawImage(img, r2, r1, GraphicsUnit.Pixel);

                r1 = new Rectangle(x, y + img.Height - lr.Bottom, img.Width / Totalindex, lr.Bottom);
                r2 = new Rectangle(x1, y1 + r.Height - lr.Bottom, r.Width, lr.Bottom);
                g.DrawImage(img, r2, r1, GraphicsUnit.Pixel);
            }
            else
                if (r.Height <= img.Height && r.Width > img.Width / Totalindex)
                {
                    r1 = new Rectangle(x, y, lr.Left, img.Height);
                    r2 = new Rectangle(x1, y1, lr.Left, r.Height);
                    g.DrawImage(img, r2, r1, GraphicsUnit.Pixel);
                    r1 = new Rectangle(x + lr.Left, y, img.Width / Totalindex - lr.Left - lr.Right, img.Height);
                    r2 = new Rectangle(x1 + lr.Left, y1, r.Width - lr.Left - lr.Right, r.Height);
                    g.DrawImage(img, r2, r1, GraphicsUnit.Pixel);
                    r1 = new Rectangle(x + img.Width / Totalindex - lr.Right, y, lr.Right, img.Height);
                    r2 = new Rectangle(x1 + r.Width - lr.Right, y1, lr.Right, r.Height);
                    g.DrawImage(img, r2, r1, GraphicsUnit.Pixel);
                }
                else
                    if (r.Height <= img.Height && r.Width <= img.Width / Totalindex) { r1 = new Rectangle((index - 1) * img.Width / Totalindex, 0, img.Width / Totalindex, img.Height); g.DrawImage(img, new Rectangle(x1, y1, r.Width, r.Height), r1, GraphicsUnit.Pixel); }
                    else if (r.Height > img.Height && r.Width > img.Width / Totalindex)
                    {
                        //top-left
                        r1 = new Rectangle(x, y, lr.Left, lr.Top);
                        r2 = new Rectangle(x1, y1, lr.Left, lr.Top);
                        g.DrawImage(img, r2, r1, GraphicsUnit.Pixel);

                        //top-bottom
                        r1 = new Rectangle(x, y + img.Height - lr.Bottom, lr.Left, lr.Bottom);
                        r2 = new Rectangle(x1, y1 + r.Height - lr.Bottom, lr.Left, lr.Bottom);
                        g.DrawImage(img, r2, r1, GraphicsUnit.Pixel);

                        //left
                        r1 = new Rectangle(x, y + lr.Top, lr.Left, img.Height - lr.Top - lr.Bottom);
                        r2 = new Rectangle(x1, y1 + lr.Top, lr.Left, r.Height - lr.Top - lr.Bottom);
                        g.DrawImage(img, r2, r1, GraphicsUnit.Pixel);

                        //top
                        r1 = new Rectangle(x + lr.Left, y,
                            img.Width / Totalindex - lr.Left - lr.Right, lr.Top);
                        r2 = new Rectangle(x1 + lr.Left, y1,
                            r.Width - lr.Left - lr.Right, lr.Top);
                        g.DrawImage(img, r2, r1, GraphicsUnit.Pixel);

                        //right-top
                        r1 = new Rectangle(x + img.Width / Totalindex - lr.Right, y, lr.Right, lr.Top);
                        r2 = new Rectangle(x1 + r.Width - lr.Right, y1, lr.Right, lr.Top);
                        g.DrawImage(img, r2, r1, GraphicsUnit.Pixel);

                        //Right
                        r1 = new Rectangle(x + img.Width / Totalindex - lr.Right, y + lr.Top,
                            lr.Right, img.Height - lr.Top - lr.Bottom);
                        r2 = new Rectangle(x1 + r.Width - lr.Right, y1 + lr.Top,
                            lr.Right, r.Height - lr.Top - lr.Bottom);
                        g.DrawImage(img, r2, r1, GraphicsUnit.Pixel);

                        //right-bottom
                        r1 = new Rectangle(x + img.Width / Totalindex - lr.Right, y + img.Height - lr.Bottom,
                            lr.Right, lr.Bottom);
                        r2 = new Rectangle(x1 + r.Width - lr.Right, y1 + r.Height - lr.Bottom,
                            lr.Right, lr.Bottom);
                        g.DrawImage(img, r2, r1, GraphicsUnit.Pixel);

                        //bottom
                        r1 = new Rectangle(x + lr.Left, y + img.Height - lr.Bottom,
                            img.Width / Totalindex - lr.Left - lr.Right, lr.Bottom);
                        r2 = new Rectangle(x1 + lr.Left, y1 + r.Height - lr.Bottom,
                            r.Width - lr.Left - lr.Right, lr.Bottom);
                        g.DrawImage(img, r2, r1, GraphicsUnit.Pixel);

                        //Center
                        r1 = new Rectangle(x + lr.Left, y + lr.Top,
                            img.Width / Totalindex - lr.Left - lr.Right, img.Height - lr.Top - lr.Bottom);
                        r2 = new Rectangle(x1 + lr.Left, y1 + lr.Top,
                            r.Width - lr.Left - lr.Right, r.Height - lr.Top - lr.Bottom);
                        g.DrawImage(img, r2, r1, GraphicsUnit.Pixel);
                    }
        }

        /// <summary>
        /// 绘图对像
        /// </summary>
        /// <param name="g"> 绘图对像</param>
        /// <param name="img">图片对像</param>
        /// <param name="r">绘置的图片大小、坐标</param>
        /// <param name="index">当前状态</param>
        /// <param name="Totalindex">状态总数</param>
        public static void DrawRect(Graphics g, Bitmap img, Rectangle r, int index, int Totalindex)
        {
            if (img == null) return;
            int width = img.Width / Totalindex;
            int height = img.Height;
            Rectangle r1, r2;
            int x = (index - 1) * width;
            int y = 0;
            r1 = new Rectangle(x, y, width, height);
            r2 = new Rectangle(r.Left, r.Top, r.Width, r.Height);
            g.DrawImage(img, r2, r1, GraphicsUnit.Pixel);
        }
    }
}
