public VerifyValue Get(Action <VerifyImageOptions> setupAction = null)
{
VerifyImageOptions options = new VerifyImageOptions();
if (setupAction != null)
{
setupAction.Invoke(options);
}
//生成随机字符
string verifyValue = _randoms.CreateRandomValue(options.CodeCount, options.OnlyNumeric).ToLower();
//生成图片
RandomImage verifyImage = _randomImageGenernator.CreateRandomImage(verifyValue, options.ImageWidth, options.ImageHeight, Color.White, Color.Blue, Color.DarkRed);
//保存到session中
_sessionService.Set(NAME, verifyValue, 5);
return(new VerifyValue {
Value = verifyImage.Image, MediaType = verifyImage.ContentType
});
}
/// <summary>
/// 创建随机图片
/// </summary>
/// <param name="value">值</param>
/// <param name="imageWidth">图片宽度</param>
/// <param name="imageHeight">图片高度</param>
/// <param name="imageBGColor">图片背景颜色</param>
/// <param name="imageTextColor1">图片文字颜色</param>
/// <param name="imageTextColor2">图片文字颜色</param>
/// <returns>随机图片</returns>
public RandomImage CreateRandomImage(string value, int imageWidth, int imageHeight, Color imageBGColor, Color imageTextColor1, Color imageTextColor2)
{
Bitmap image = new Bitmap(imageWidth, imageHeight);
Graphics g = Graphics.FromImage(image);
//保存图片数据
MemoryStream stream = new MemoryStream();
try
{
//生成随机生成器
//Random random = new Random();
//清空图片背景色
g.Clear(imageBGColor);
//画图片的背景噪音线
for (int i = 0; i < 5; i++)
{
int x1 = _random.Next(image.Width);
int x2 = _random.Next(image.Width);
int y1 = _random.Next(image.Height);
int y2 = _random.Next(image.Height);
g.DrawLine(new Pen(Color.FromArgb(_random.Next(255), _random.Next(255), _random.Next(255))), x1, y1, x2, y2);
}
Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),
imageTextColor1,
imageTextColor2,
1.2f,
true);
g.DrawString(value, font, brush, 2, 2);
//画图片的前景噪音点
for (int i = 0; i < 80; i++)
{
int x = _random.Next(image.Width);
int y = _random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(_random.Next()));
}
//画图片的边框线
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
RandomImage verifyImage = new RandomImage();
image.Save(stream, ImageFormat.Jpeg);
verifyImage.Image = stream.ToArray();
verifyImage.ContentType = "image/jpeg";
return(verifyImage);
}
finally
{
if (stream != null)
{
stream.Dispose();
}
if (g != null)
{
g.Dispose();
}
if (image != null)
{
image.Dispose();
}
}
}
