/// <summary>
///
/// </summary>
/// <param name="options"></param>
/// <returns></returns>
public async Task <(Point[] FontPoints, Image FontImage, Image BoardImage)> GenerateAsync(CaptchaOptions options)
{
await Task.FromResult(0);
var imageFile = Directory
.GetFiles(Path.Combine(options.RootDirectory, options.ClickCodeImageDir))
.RandomTake(1).SingleOrDefault();
using var imageOrigin = Image.FromFile(imageFile).Resize(Width, Height, true, true);
var strs = String.Split(new[] { ' ', ',' }, StringSplitOptions.RemoveEmptyEntries);
var points = new List <Point>(strs.Length);
var imageFont = new Bitmap(FontSize / 2 * String.Length + (int)(FontSize / 2 * 1.5D), (int)(FontSize / 2 * 1.5D));
using var graphicsFont = Graphics.FromImage(imageFont);
graphicsFont.Clear(CaptchaHelper.RandomColor(false));
//绘制干扰线
for (int i = 0; i < 4; i++)
{
var random = new Random(Guid.NewGuid().GetHashCode());
var x = random.Next(imageFont.Width);
var y = random.Next(imageFont.Height);
var x1 = random.Next(imageFont.Width);
var y1 = random.Next(imageFont.Height);
var x2 = random.Next(imageFont.Width);
var y2 = random.Next(imageFont.Height);
var x3 = random.Next(imageFont.Width);
var y3 = random.Next(imageFont.Height);
using var pen = new Pen(CaptchaHelper.RandomColor(true));
graphicsFont.DrawBezier(pen, x, y, x1, y1, x2, y2, x3, y3);
}
var imageBoard = (Image)imageOrigin.Clone();
using var graphicsBoard = Graphics.FromImage(imageBoard);
//绘制文字
for (int i = 0; i < strs.Length; i++)
{
var item = strs[i];
var random = new Random(Guid.NewGuid().GetHashCode());
using var pen = new Pen(CaptchaHelper.RandomColor());
using var font1 = new Font(options.FontFamilies[random.Next(options.FontFamilies.Length)], FontSize / 2, options.FontStyles[random.Next(options.FontStyles.Length)]);
graphicsFont.DrawString(item, font1, pen.Brush, FontSize * i, 0);
var point = new Point(random.Next(0, Width - item.Length * FontSize - FontSize), random.Next(0, Height - FontSize - FontSize));
using var font2 = new Font(options.FontFamilies[random.Next(options.FontFamilies.Length)], FontSize, options.FontStyles[random.Next(options.FontStyles.Length)]);
graphicsBoard.DrawString(item, font2, pen.Brush, point);
points.Add(point);
}
return(points.ToArray(), imageFont, imageBoard);
}
/// <summary>
///
/// </summary>
/// <param name="strings"></param>
/// <param name="options"></param>
/// <returns></returns>
public Image Generate(IEnumerable <string> strings, CaptchaOptions options)
{
var bg = new Random(Guid.NewGuid().GetHashCode()).NextBool();
var bgColor = CaptchaHelper.RandomColor(bg);
var image = new Bitmap(Width, Height);
using var graphics = Graphics.FromImage(image);
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法
graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //设置高质量,低速度呈现平滑程度
graphics.Clear(bgColor); //设置背景
//绘制字符
var charCount = strings.Sum(_ => _.Length);
var charWidth = (float)image.Width / (charCount + 3);//字符所占宽度
var charLeft = FontSize / 2F;
if (!GenerateGif)
{
//绘制干扰线
for (int i = 0; i < 6; i++)
{
var random = new Random(Guid.NewGuid().GetHashCode());
var x = random.Next(image.Width);
var y = random.Next(image.Height);
var x1 = random.Next(image.Width);
var y1 = random.Next(image.Height);
var x2 = random.Next(image.Width);
var y2 = random.Next(image.Height);
var x3 = random.Next(image.Width);
var y3 = random.Next(image.Height);
using var pen = new Pen(CaptchaHelper.RandomColor(!bg));
graphics.DrawBezier(pen, x, y, x1, y1, x2, y2, x3, y3);
}
foreach (var str in strings)
{
var random = new Random(Guid.NewGuid().GetHashCode());
using var font = new Font(options.FontFamilies[random.Next(options.FontFamilies.Length)], FontSize, options.FontStyles[random.Next(options.FontStyles.Length)]);
using var pen = new Pen(CaptchaHelper.RandomColor(!bg));
graphics.DrawString(str, font, pen.Brush, charLeft, random.Next(-FontSize / 2, FontSize / 2));
charLeft += str.Length * charWidth;
}
return(image);
}
else
{
using var memory = new MemoryStream();
using var gif = new GIFWriter(memory, 500, 0);
gif.WriteFrame(image);
foreach (var str in strings)
{
using var _image = new Bitmap(image.Width, image.Height);
using var _graphics = Graphics.FromImage(_image);
_graphics.Clear(bgColor);
//绘制干扰线
for (int i = 0; i < 3; i++)
{
var _random = new Random(Guid.NewGuid().GetHashCode());
var x = _random.Next(image.Width);
var y = _random.Next(image.Height);
var x1 = _random.Next(image.Width);
var y1 = _random.Next(image.Height);
var x2 = _random.Next(image.Width);
var y2 = _random.Next(image.Height);
var x3 = _random.Next(image.Width);
var y3 = _random.Next(image.Height);
using var _pen = new Pen(CaptchaHelper.RandomColor(!bg));
_graphics.DrawBezier(_pen, x, y, x1, y1, x2, y2, x3, y3);
}
var random = new Random(Guid.NewGuid().GetHashCode());
using var font = new Font(options.FontFamilies[random.Next(options.FontFamilies.Length)], FontSize, options.FontStyles[random.Next(options.FontStyles.Length)]);
using var pen = new Pen(CaptchaHelper.RandomColor(!bg));
_graphics.DrawString(str, font, pen.Brush, charLeft, random.Next(0, FontSize / 2));
charLeft += str.Length * charWidth;
gif.WriteFrame(_image);
}
return(Image.FromStream(memory));
}
}
