二维码生成基础算法

用C#生成二维码
/// <summary>
        /// 生成带Logo的二维码
        /// </summary>
        /// <param name="text">内容</param>
        /// <param name="width">宽度</param>
        /// <param name="height">高度</param>
        public static Bitmap Generate3(string text, int width, int height)
        {
            //Logo 图片
            string logoPath = System.AppDomain.CurrentDomain.BaseDirectory @"\img\logo.png";
            Bitmap logo = new Bitmap(logoPath);
            //构造二维码写码器
            MultiFormatWriter writer = new MultiFormatWriter();
            Dictionary<EncodeHintType, object> hint = new Dictionary<EncodeHintType, object>();
            hint.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
            hint.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            //hint.Add(EncodeHintType.MARGIN, 2);//旧版本不起作用，需要手动去除白边
            
            //生成二维码 
            BitMatrix bm = writer.encode(text, BarcodeFormat.QR_CODE, width 30, height 30, hint);
            bm = deleteWhite(bm);
            BarcodeWriter barcodeWriter = new BarcodeWriter();
            Bitmap map = barcodeWriter.Write(bm);

            //获取二维码实际尺寸（去掉二维码两边空白后的实际尺寸）
            int[] rectangle = bm.getEnclosingRectangle();
            
            //计算插入图片的大小和位置
            int middleW = Math.Min((int)(rectangle[2] / 3), logo.Width);
            int middleH = Math.Min((int)(rectangle[3] / 3), logo.Height);
            int middleL = (map.Width - middleW) / 2;
            int middleT = (map.Height - middleH) / 2;

            Bitmap bmpimg = new Bitmap(map.Width, map.Height, PixelFormat.Format32bppArgb);
            using (Graphics g = Graphics.FromImage(bmpimg))
            {
                g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
                g.DrawImage(map, 0, 0,width,height);
                //白底将二维码插入图片
                g.FillRectangle(Brushes.White, middleL, middleT, middleW, middleH);
                g.DrawImage(logo, middleL, middleT, middleW, middleH);
            }
            return bmpimg;
        }