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185
常用工具集/Utility/Qrcode/QRCodeUtils.cs
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185
常用工具集/Utility/Qrcode/QRCodeUtils.cs
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.Text;
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using SkiaSharp;
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using ZXing;
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using ZXing.Common;
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using ZXing.QrCode.Internal;
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namespace 常用工具集.Utility.Qrcode
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{
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public class QRCodeUtils
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{
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/// <summary>
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///
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/// </summary>
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/// <param name="msg">二维码内容</param>
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/// <param name="codeSizeInPixels">图片长宽</param>
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/// <returns></returns>
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public static SKBitmap EncodeQrCode(string msg, int codeSizeInPixels, out string svg)
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{
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Dictionary<EncodeHintType, object> hints = new Dictionary<EncodeHintType, object>();
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hints.Add(EncodeHintType.CHARACTER_SET, "utf-8");
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hints.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
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hints.Add(EncodeHintType.MARGIN, 1);
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BitMatrix matrix = new MultiFormatWriter().encode(msg, BarcodeFormat.QR_CODE, codeSizeInPixels, codeSizeInPixels, hints);
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matrix = deleteWhite(matrix);//删除白边
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SKBitmap bitmap = new SKBitmap(matrix.Width, matrix.Height);
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SKCanvas canvas = new SKCanvas(bitmap);
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canvas.Clear();
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SKPaint paint = new SKPaint()
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{
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Color = SKColors.Black,
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IsAntialias = true,
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Style = SKPaintStyle.Fill
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};
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StringBuilder sb = new StringBuilder();
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sb.AppendLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
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sb.AppendLine($"<svg version=\"1.1\" id=\"图层_1\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" x=\"0px\" y=\"0px\"\r\n\t viewBox=\"0 0 {matrix.Width} {matrix.Height}\" style=\"enable-background:new 0 0 {matrix.Width} {matrix.Height};\" xml:space=\"preserve\">");
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sb.AppendLine("<style type=\"text/css\">.st0{fill:#E60012;}</style>");
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bool[,] handled = new bool[matrix.Width, matrix.Height];//默认全部false
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for (int x = 0; x < matrix.Width; x++)
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{
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for (int y = 0; y < matrix.Height; y++)
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{
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if (matrix[x, y] && !handled[x, y])
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{
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//从当前位置找矩形区域
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FindRect(x, y, matrix, ref handled, out int width, out int height);
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//x从x到x+width
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//y从y到y+height
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//这些区域是已处理的
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for (int i = 0; i < width; i++)
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{
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for (int j = 0; j < height; j++)
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{
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handled[x + i, y + j] = true;
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}
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}
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sb.AppendLine($"<rect class=\"st0\" x=\"{x}\" y=\"{y}\" width=\"{width}\" height=\"{height}\" />");
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canvas.DrawRect(x, y, width, height, paint);
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}
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}
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}
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sb.AppendLine("</svg>");
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svg = sb.ToString();
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canvas.Dispose();
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return bitmap;
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}
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/// <summary>
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/// 找到未处理的矩形区域
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/// </summary>
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/// <param name="x"></param>
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/// <param name="y"></param>
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/// <param name="matrix"></param>
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/// <param name="handled"></param>
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/// <param name="width"></param>
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/// <param name="height"></param>
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private static void FindRect(int x, int y, BitMatrix matrix, ref bool[,] handled, out int width, out int height)
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{
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width = 1;
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height = 1;
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bool flag = false;
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int maxOffset = FindXMax(matrix, x, y, ref handled);
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A:
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if (maxOffset == 0)
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{
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return;
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}
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while (true)
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{
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height++;
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if ((y + height) >= matrix.Height)
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{
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break;
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}
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if (!matrix[x, y + height] || handled[x, y + height])
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{
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break;
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}
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bool allTrue = true;//默认最后一行全是true
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for (int i = 0; i < maxOffset; i++)
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{
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if (!matrix[x + i, y + height])
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{
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allTrue = false;
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break;
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}
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if (handled[x + i, y + height])
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{
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allTrue = false;
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break;
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}
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}
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if (allTrue)
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{
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flag = true;
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}
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else
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{
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if (flag || height == 2)
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{
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height--;
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break;
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}
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maxOffset--;
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flag = false;
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goto A;
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}
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}
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width = maxOffset + 1;
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}
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private static int FindXMax(BitMatrix matrix, int x, int y, ref bool[,] handled)
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{
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int offset = 0;
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while (true)
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{
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if ((x + offset) > matrix.Width)
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{
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break;
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}
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if (!matrix[x + offset, y])
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{
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offset--;
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break;
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}
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offset++;
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}
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return offset;
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}
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/// <summary>
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/// 去除白边
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/// </summary>
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/// <param name="matrix"></param>
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/// <returns></returns>
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private static BitMatrix deleteWhite(BitMatrix matrix)
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{
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int[] rec = matrix.getEnclosingRectangle();
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int resWidth = rec[2] + 1;
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int resHeight = rec[3] + 1;
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BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
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resMatrix.clear();
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for (int i = 0; i < resWidth; i++)
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{
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for (int j = 0; j < resHeight; j++)
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{
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if (matrix[i + rec[0], j + rec[1]])
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resMatrix[i, j] = true;
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}
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}
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return resMatrix;
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}
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public static SKBitmap EncodeQrCode(string msg, out string svg)
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{
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return EncodeQrCode(msg, 900, out svg);
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}
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}
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}
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