using SkiaSharp;
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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using static log4net.Appender.ColoredConsoleAppender;
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namespace WIDESEA_Core.Utilities
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{
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public static class VierificationCode
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{
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private static readonly string[] _chars = new string[] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "P", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" };
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private static readonly SKColor[] colors = { SKColors.Black, SKColors.Green, SKColors.Brown };
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private static readonly string[] fonts = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };
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public static string RandomText()
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{
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string code = "";//产生的随机数
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int temp = -1;
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Random rand = new Random();
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for (int i = 1; i < 5; i++)
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{
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if (temp != -1)
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{
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rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));
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}
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int t = rand.Next(61);
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if (temp != -1 && temp == t)
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{
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return RandomText();
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}
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temp = t;
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code += _chars[t];
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}
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return code;
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}
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public static string CreateBase64Imgage(string code)
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{
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var random = new Random();
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var info = new SKImageInfo((int)code.Length * 18, 32);
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using var bitmap = new SKBitmap(info);
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using var canvas = new SKCanvas(bitmap);
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canvas.Clear(SKColors.White);
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using var pen = new SKPaint();
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pen.FakeBoldText = true;
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pen.Style = SKPaintStyle.Fill;
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pen.TextSize = 20;// 0.6f * info.Width * pen.TextSize / pen.MeasureText(code);
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//绘制随机字符
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for (int i = 0; i < code.Length; i++)
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{
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pen.Color = random.GetRandom(colors);//随机颜色索引值
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pen.Typeface = SKTypeface.FromFamilyName(random.GetRandom(fonts), 700, 20, SKFontStyleSlant.Italic);//配置字体
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var point = new SKPoint()
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{
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X = i * 16,
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Y = 22// info.Height - ((i + 1) % 2 == 0 ? 2 : 4),
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};
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canvas.DrawText(code.Substring(i, 1), point, pen);//绘制一个验证字符
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}
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// 绘制噪点
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var points = Enumerable.Range(0, 100).Select(
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_ => new SKPoint(random.Next(bitmap.Width), random.Next(bitmap.Height))
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).ToArray();
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canvas.DrawPoints(
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SKPointMode.Points,
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points,
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pen);
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//绘制贝塞尔线条
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for (int i = 0; i < 2; i++)
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{
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var p1 = new SKPoint(0, 0);
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var p2 = new SKPoint(0, 0);
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var p3 = new SKPoint(0, 0);
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var p4 = new SKPoint(0, 0);
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var touchPoints = new SKPoint[] { p1, p2, p3, p4 };
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using var bPen = new SKPaint();
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bPen.Color = random.GetRandom(colors);
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bPen.Style = SKPaintStyle.Stroke;
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using var path = new SKPath();
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path.MoveTo(touchPoints[0]);
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path.CubicTo(touchPoints[1], touchPoints[2], touchPoints[3]);
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canvas.DrawPath(path, bPen);
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}
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return bitmap.ToBase64String(SKEncodedImageFormat.Png);
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}
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public static T GetRandom<T>(this Random random, T[] tArray)
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{
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if (random == null) random = new Random();
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return tArray[random.Next(tArray.Length)];
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}
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/// <summary>
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/// SKBitmap转Base64String
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/// </summary>
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/// <param name="bitmap"></param>
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/// <param name="format"></param>
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/// <returns></returns>
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public static string ToBase64String(this SKBitmap bitmap, SKEncodedImageFormat format)
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{
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using var memStream = new MemoryStream();
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using var wstream = new SKManagedWStream(memStream);
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bitmap.Encode(wstream, format, 32);
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memStream.TryGetBuffer(out ArraySegment<byte> buffer);
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return $"{Convert.ToBase64String(buffer.Array, 0, (int)memStream.Length)}";
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}
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}
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}
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