public Captcha CreateCaptcha(CaptchaOptions options)
{
if (options.ImgWidth < 0)
{
throw new ArgumentException("图片绘制宽度不能小于0");
}
if (options.ImgHeight < 0)
{
throw new ArgumentException("图片绘制高度不能小于0");
}
if (options.MinCharsLength < 1 || options.MinCharsLength > 10)
{
throw new ArgumentException("随机最少字符长度范围为[1~10]之间");
}
if (options.MaxCharsLength < 1 || options.MaxCharsLength > 10)
{
throw new ArgumentException("随机最多字符长度范围为[1~10]之间");
}
if (options.MaxCharsLength < options.MinCharsLength)
{
throw new ArgumentException("随机最多字符长度不能少于最少字符长度");
}
var length = _randomProvider.ToNumber(options.MinCharsLength, options.MaxCharsLength);
var code = _randomProvider.ToChars(length);
var captcha = _graphicsStrategy.Drawing(code, options.ImgWidth, options.ImgHeight, length, options.FontColor, options.BackgroundColor);
//存储验证码
_captchaStore.Add(captcha);
return(captcha);
}
public Captcha Drawing(string code, int width, int height, int length, string fontColor, string backgroundColor)
{
var chars = _randomProvider.ToChars(length);
using (Bitmap image = new Bitmap(width, height))
{
using (Graphics g = Graphics.FromImage(image))
{
g.Clear(ColorTranslator.FromHtml(backgroundColor));
g.SmoothingMode = SmoothingMode.AntiAlias;
g.SmoothingMode = SmoothingMode.HighQuality;
g.CompositingQuality = CompositingQuality.HighQuality;
g.InterpolationMode = InterpolationMode.High;
g.TextRenderingHint = TextRenderingHint.AntiAlias;
g.PixelOffsetMode = PixelOffsetMode.HighSpeed;
var fontFamily = new FontFamily("Arial");
var pen = new Pen(ColorTranslator.FromHtml(fontColor));
var ch = new Chars();
string c;
int toLeft = 10, toTop = 15;
int perLineCount = length / 2;
for (int i = 0; i < length; i++)
{
c = chars[i].ToString();
var rectangle = ch[chars[i]];
using (GraphicsPath path = new GraphicsPath(FillMode.Alternate))
{
path.AddString(c, fontFamily, (int)FontStyle.Regular, 50, new Point(toLeft + rectangle.X, toTop + rectangle.Y), StringFormat.GenericTypographic);
g.DrawPath(pen, path);
}
//if (maxHeight < rectangle.Height)
// maxHeight = rectangle.Height;
//if (i == perLineCount)
//{
// toTop = maxHeight + 2;
// toLeft = 10;
//}
toLeft += rectangle.Width;
}
AddWaveEffectGraphics(width, height, image);
using (var stream = new MemoryStream())
{
image.Save(stream, ImageFormat.Png);
return(new Captcha(chars, stream.ToArray(), "image/png"));
}
}
}
}