C#利用Graphics类绘制进阶--绘制商品69码EAN-13

效果图：6903957188880

利用EAN13.cs类绘制方法

public System.Drawing.Image drawEAN13(string StrEAN13)
{
    //获取验证位
    char _ISBN = EAN13.EAN13ISBN(StrEAN13);
    //MessageBox.Show(_ISBN.ToString());
    EAN13 _EAN13Code = new EAN13();
    _EAN13Code.Magnify = 4;
    _EAN13Code.Heigth = 151;
    _EAN13Code.FontSize = 40;
    return _EAN13Code.GetCodeImage(StrEAN13);
}

EAN13.cs类源码

using System;
using System.Collections.Generic;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace GraphicTest
{
    public class EAN13
    {
        private DataTable m_EAN13 = new DataTable();
        public EAN13()
        {
            m_EAN13.Columns.Add("ID");
            m_EAN13.Columns.Add("Type");
            m_EAN13.Columns.Add("A");
            m_EAN13.Columns.Add("B");
            m_EAN13.Columns.Add("C");
            m_EAN13.Rows.Add("0", "AAAAAA", "0001101", "0100111", "1110010");
            m_EAN13.Rows.Add("1", "AABABB", "0011001", "0110011", "1100110");
            m_EAN13.Rows.Add("2", "AABBAB", "0010011", "0011011", "1101100");
            m_EAN13.Rows.Add("3", "AABBBA", "0111101", "0100001", "1000010");
            m_EAN13.Rows.Add("4", "ABAABB", "0100011", "0011101", "1011100");
            m_EAN13.Rows.Add("5", "ABBAAB", "0110001", "0111001", "1001110");
            m_EAN13.Rows.Add("6", "ABBBAA", "0101111", "0000101", "1010000");
            m_EAN13.Rows.Add("7", "ABABAB", "0111011", "0010001", "1000100");
            m_EAN13.Rows.Add("8", "ABABBA", "0110111", "0001001", "1001000");
            m_EAN13.Rows.Add("9", "ABBABA", "0001011", "0010111", "1110100");
        }
        private uint m_Height = 40;
        /// <summary>
        /// 绘制高
        /// </summary>
        public uint Heigth { get { return m_Height; } set { m_Height = value; } }
        private byte m_FontSize = 0;
        /// <summary>
        /// 字体大小（宋体）
        /// </summary>
        public byte FontSize { get { return m_FontSize; } set { m_FontSize = value; } }

        private byte m_Magnify = 0;
        /// <summary>     
        /// 放大系数    
        /// </summary>
        public byte Magnify { get { return m_Magnify; } set { m_Magnify = value; } }
        public Bitmap GetCodeImage(string p_Text)
        {
            if (p_Text.Length != 13) throw new Exception("数字不是13位!");
            string _CodeText = p_Text.Remove(0, 1);
            string _CodeIndex = "101";
            char[] _LeftType = GetValue(p_Text.Substring(0, 1), "Type").ToCharArray();
            for (int i = 0; i != 6; i++)
            {
                _CodeIndex += GetValue(_CodeText.Substring(0, 1), _LeftType[i].ToString());
                _CodeText = _CodeText.Remove(0, 1);
            }

            _CodeIndex += "01010";

            for (int i = 0; i != 6; i++)
            {
                _CodeIndex += GetValue(_CodeText.Substring(0, 1), "C");
                _CodeText = _CodeText.Remove(0, 1);
            }
            _CodeIndex += "101";
            return GetImage(_CodeIndex, p_Text);
        }
        /// <summary>
        /// 获取目标对应的数据
        /// </summary>
        /// <param name="p_Code">编码</param>
        /// <param name="p_Value">类型</param>        
        /// <returns>编码</returns>
        private string GetValue(string p_Value, string p_Type)
        {
            if (m_EAN13 == null) return "";
            DataRow[] _Row = m_EAN13.Select("ID='" + p_Value + "'");
            if (_Row.Length != 1) throw new Exception("错误的编码" + p_Value.ToString());
            return _Row[0][p_Type].ToString();
        }
        /// <summary>
        /// 绘制编码图形
        /// </summary>
        /// <param name="p_Text">编码</param>
        /// <returns>图形</returns>
        private Bitmap GetImage(string p_Text, string p_ViewText)
        {
            char[] _Value = p_Text.ToCharArray();
            int _FontWidth = 0;
            Font _MyFont = null;
            if (m_FontSize != 0)
            {
                #region 获取符合大小的字体
                _MyFont = new Font("楷体", m_FontSize);
                Bitmap _MyFontBmp = new Bitmap(m_FontSize, m_FontSize);
                Graphics _FontGraphics = Graphics.FromImage(_MyFontBmp);

                for (byte i = m_FontSize; i != 0; i--)
                {
                    SizeF _DrawSize = _FontGraphics.MeasureString(p_ViewText.Substring(0, 1), _MyFont);
                    if (_DrawSize.Height > m_FontSize)
                    {
                        _MyFont = new Font("OCR-B", i);
                    }
                    else
                    {
                        _FontWidth = (int)_DrawSize.Width;
                        break;
                    }
                }
                #endregion
            }
            if (ScanDrawText(_MyFont, p_Text, _FontWidth) == false)
            {
                _FontWidth = 0;
                m_FontSize = 0;
            }
            //宽 == 需要绘制的数量*放大倍数 + 两个字的宽   
            Bitmap _CodeImage = new Bitmap(_Value.Length * ((int)m_Magnify) + (_FontWidth * 2), (int)m_Height);
            Graphics _Garphics = Graphics.FromImage(_CodeImage);
            _Garphics.FillRectangle(Brushes.White, new Rectangle(0, 0, _CodeImage.Width, _CodeImage.Height));

            int _Height = 0;
            int _LenEx = _FontWidth;
            for (int i = 0; i != _Value.Length; i++)
            {
                int _DrawWidth = m_Magnify;
                if (i == 0 || i == 2 || i == 46 || i == 48 || i == 92 || i == 94)
                {
                    _Height = (int)m_Height - 27;
                }
                else
                {
                    _Height = (int)m_Height - m_FontSize;
                }
                if (_Value[i] == '1')
                {
                    _Garphics.FillRectangle(Brushes.Black, new Rectangle(_LenEx+8, 0, _DrawWidth, _Height));
                 }
                else
                {
                    _Garphics.FillRectangle(Brushes.White, new Rectangle(_LenEx+8, 0, _DrawWidth, _Height));
                }
                _LenEx += _DrawWidth;
            }
            //绘制文字
            if (_FontWidth != 0 && m_FontSize != 0)
            {
                _MyFont = new Font("OCR-B", 29,FontStyle.Regular);
                int _StarX = 0;
                int _StarY = (int)m_Height - _MyFont.Height+4;
                _Garphics.DrawString(p_ViewText.Substring(0, 1), _MyFont, Brushes.Black, -7, _StarY);
                _StarX = _FontWidth + (3 * (m_Magnify))+10;
                for (int i = 1; i < 7; i++)
                {
                    _Garphics.DrawString(p_ViewText.Substring(i, 1), _MyFont, Brushes.Black, _StarX + 28 * (i - 1), _StarY);
                }
                _StarX = _FontWidth + (50 * (m_Magnify));
                for (int i = 1; i < 7; i++)
                {
                    _Garphics.DrawString(p_ViewText.Substring(6 + i, 1), _MyFont, Brushes.Black, _StarX + 28 * (i - 1), _StarY);
                }
            }
            _Garphics.Dispose();
            return _CodeImage;
        }
        /// <summary>
        /// 判断字体是否大与绘制图形
        /// </summary>
        /// <param name="_MyFont">字体</param>
        /// <param name="p_Text">文字</param>
        /// <param name="p_Width">字体的宽</param>
        /// <returns>true可以绘制 False不可以绘制</returns>
        private bool ScanDrawText(Font _MyFont, string p_Text, int p_Width)
        {
            if (_MyFont == null) return false;
            int _Width = (p_Text.Length - 6 - 5) * ((int)m_Magnify + 1);
            if ((p_Width * 12) > _Width) return false;
            return true;
        }
        /// <summary>
        /// 获得条码的最后一位（验证位）
        /// </summary>
        /// <param name="ANumbers">条码</param>
        /// <returns></returns>
        public static char EAN13ISBN(string _Numb)
        {
            int _Sum = 0;
            int _i = 1;   //权值
            foreach (char _Char in _Numb)
            {
                if ("0123456789".IndexOf(_Char) < 0) continue; // 非数字
                _Sum += (_Char - '0') * _i;
                _i = _i == 1 ? 3 : 1;
            }
            return "01234567890"[10 - _Sum % 10];
        }

    }
}