using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ZXing;
using ZXing.Common;
using ZXing.QrCode;
using ZXing.QrCode.Internal;

namespace DemoQrCode
{
 /// <summary>
 /// 描述：條形碼和二維碼幫助類
 /// 時間：2018-02-18
 /// </summary>
 public class BarcodeHelper
 {
  /// <summary>
  /// 生成二維碼
  /// </summary>
  /// <param name="text">內容</param>
  /// <param name="width">寬度</param>
  /// <param name="height">高度</param>
  /// <returns></returns>
  public static Bitmap Generate1(string text,int width,int height)
  {
   BarcodeWriter writer = new BarcodeWriter();
   writer.Format = BarcodeFormat.QR_CODE;
   QrCodeEncodingOptions options = new QrCodeEncodingOptions()
   {
    DisableECI = true,//設置內容編碼
    CharacterSet = "UTF-8", //設置二維碼的寬度和高度
    Width = width,
    Height = height,
    Margin = 1//設置二維碼的邊距,單位不是固定像素
   };
   
   writer.Options = options;
   Bitmap map = writer.Write(text);
   return map;
  }

  /// <summary>
  /// 生成一維條形碼
  /// </summary>
  /// <param name="text">內容</param>
  /// <param name="width">寬度</param>
  /// <param name="height">高度</param>
  /// <returns></returns>
  public static Bitmap Generate2(string text,int width,int height)
  {
   BarcodeWriter writer = new BarcodeWriter();
   //使用ITF 格式，不能被現在常用的支付寶、微信掃出來
   //如果想生成可識別的可以使用 CODE_128 格式
   //writer.Format = BarcodeFormat.ITF;
   writer.Format = BarcodeFormat.CODE_39;
   EncodingOptions options = new EncodingOptions()
   {
    Width = width,
    Height = height,
    Margin = 2
   };
   writer.Options = options;
   Bitmap map = writer.Write(text);
   return map;
  }

  /// <summary>
  /// 生成帶Logo的二維碼
  /// </summary>
  /// <param name="text">內容</param>
  /// <param name="width">寬度</param>
  /// <param name="height">高度</param>
  public static Bitmap Generate3(string text, int width, int height)
  {
   //Logo 圖片
   string logoPath = System.AppDomain.CurrentDomain.BaseDirectory + @"\img\logo.png";
   Bitmap logo = new Bitmap(logoPath);
   //構造二維碼寫碼器
   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);//舊版本不起作用，需要手動去除白邊
   
   //生成二維碼 
   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);

   //獲取二維碼實際尺寸（去掉二維碼兩邊空白后的實際尺寸）
   int[] rectangle = bm.getEnclosingRectangle();
   
   //計算插入圖片的大小和位置
   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);
    //白底將二維碼插入圖片
    g.FillRectangle(Brushes.White, middleL, middleT, middleW, middleH);
    g.DrawImage(logo, middleL, middleT, middleW, middleH);
   }
   return bmpimg;
  }

  /// <summary>
  /// 刪除默認對應的空白
  /// </summary>
  /// <param name="matrix"></param>
  /// <returns></returns>
  private static BitMatrix deleteWhite(BitMatrix matrix)
  {
   int[] rec = matrix.getEnclosingRectangle();
   int resWidth = rec[2] + 1;
   int resHeight = rec[3] + 1;

   BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
   resMatrix.clear();
   for (int i = 0; i < resWidth; i++)
   {
    for (int j = 0; j < resHeight; j++)
    {
     if (matrix[i + rec[0], j + rec[1]])
      resMatrix[i, j]=true;
    }
   }
   return resMatrix;
  }
 }
}