using SkiaSharp;
|
using System;
|
using System.IO;
|
using System.Linq;
|
using System.Runtime.InteropServices;
|
|
namespace WIDESEA_Core.Utilities
|
{
|
public static class VierificationCodeServices
|
{ //验证码字体集合
|
private static readonly string[] fonts = null;
|
|
static VierificationCodeServices()
|
{
|
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
|
{
|
fonts = new string[] { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };
|
}
|
else
|
{
|
fonts = new string[] { "Arial", "Arial", "宋体", "宋体" };
|
}
|
}
|
|
private static readonly SKColor[] colors = { SKColors.Black, SKColors.Green, SKColors.Brown };
|
|
/// <summary>
|
///
|
/// </summary>
|
/// <param name="code"></param>
|
/// <returns></returns>
|
public static string CreateBase64Image(string code)
|
{
|
var random = new Random();
|
var info = new SKImageInfo((int)code.Length * 18, 32);
|
using var bitmap = new SKBitmap(info);
|
using var canvas = new SKCanvas(bitmap);
|
|
canvas.Clear(SKColors.White);
|
|
using var pen = new SKPaint();
|
pen.FakeBoldText = true;
|
pen.Style = SKPaintStyle.Fill;
|
pen.TextSize = 20;// 0.6f * info.Width * pen.TextSize / pen.MeasureText(code);
|
|
//绘制随机字符
|
for (int i = 0; i < code.Length; i++)
|
{
|
pen.Color = random.GetRandom(colors);//随机颜色索引值
|
|
pen.Typeface = SKTypeface.FromFamilyName(random.GetRandom(fonts), 700, 20, SKFontStyleSlant.Italic);//配置字体
|
var point = new SKPoint()
|
{
|
X = i * 16,
|
Y = 22// info.Height - ((i + 1) % 2 == 0 ? 2 : 4),
|
|
};
|
canvas.DrawText(code.Substring(i, 1), point, pen);//绘制一个验证字符
|
|
}
|
|
// 绘制噪点
|
var points = Enumerable.Range(0, 100).Select(
|
_ => new SKPoint(random.Next(bitmap.Width), random.Next(bitmap.Height))
|
).ToArray();
|
canvas.DrawPoints(
|
SKPointMode.Points,
|
points,
|
pen);
|
|
//绘制贝塞尔线条
|
for (int i = 0; i < 2; i++)
|
{
|
var p1 = new SKPoint(0, 0);
|
var p2 = new SKPoint(0, 0);
|
var p3 = new SKPoint(0, 0);
|
var p4 = new SKPoint(0, 0);
|
|
var touchPoints = new SKPoint[] { p1, p2, p3, p4 };
|
|
using var bPen = new SKPaint();
|
bPen.Color = random.GetRandom(colors);
|
bPen.Style = SKPaintStyle.Stroke;
|
|
using var path = new SKPath();
|
path.MoveTo(touchPoints[0]);
|
path.CubicTo(touchPoints[1], touchPoints[2], touchPoints[3]);
|
canvas.DrawPath(path, bPen);
|
}
|
return bitmap.ToBase64String(SKEncodedImageFormat.Png);
|
}
|
|
//public static T GetRandom<T>(this Random random, T[] tArray)
|
//{
|
// if (random == null) random = new Random();
|
// return tArray[random.Next(tArray.Length)];
|
//}
|
|
/// <summary>
|
/// SKBitmap转Base64String
|
/// </summary>
|
/// <param name="bitmap"></param>
|
/// <param name="format"></param>
|
/// <returns></returns>
|
//public static string ToBase64String(this SKBitmap bitmap, SKEncodedImageFormat format)
|
//{
|
// using var memStream = new MemoryStream();
|
// using var wstream = new SKManagedWStream(memStream);
|
// bitmap.Encode(wstream, format, 32);
|
// memStream.TryGetBuffer(out ArraySegment<byte> buffer);
|
// return $"{Convert.ToBase64String(buffer.Array, 0, (int)memStream.Length)}";
|
//}
|
}
|
}
|
