internal static bool ParseReadnessParam(NameValueCollection parameters, out ReadnessLevel readnessLevel)
{
if ((null != parameters) && !string.IsNullOrEmpty(parameters[CaptchaImageTransformation.READLEVEL_KEY]))
{
readnessLevel = (ReadnessLevel)Enum.Parse(typeof(ReadnessLevel), parameters[CaptchaImageTransformation.READLEVEL_KEY]);
return true;
}
else
{
readnessLevel = ReadnessLevel.Normal;
return false;
}
}
// Methods
internal static string ToQueryString(
int width,
int height,
int clientCacheDuration,
int serverCacheDuration,
RotateFlipType rotateFlip,
bool drawGrayscale,
bool drawSepia,
DynamicText text,
DynamicImageFormat imageFormat,
KeyValuePair<Type, IDictionary<string, string>>? imageCreator,
Dictionary<Type, IDictionary<string, string>> imageTransformations,
TextContainerSizeType sizeType,
CaptchaStyle distortionStyle,
ReadnessLevel readnessLevel,
Color backColor)
{
string dynamicImageQueryString = DynamicImageProvider.ToQueryString(
null,
width,
height,
clientCacheDuration,
serverCacheDuration,
rotateFlip,
drawGrayscale,
drawSepia,
text,
imageFormat,
imageCreator,
imageTransformations);
List<string> parameters = new List<string>();
string parameterFormat = "{0}={1}";
// size type
if (TextContainerSizeType.Specified != sizeType)
{
parameters.Add(string.Format(parameterFormat, TextDependentImageCreator.TEXTCONTSIZETYPE_KEY, sizeType));
}
// distortion style
if (CaptchaStyle.Confetti != distortionStyle)
{
parameters.Add(string.Format(parameterFormat, CaptchaImageTransformation.DISTSTYLE_KEY, distortionStyle));
}
// readness level
if (ReadnessLevel.Normal != readnessLevel)
{
parameters.Add(string.Format(parameterFormat, CaptchaImageTransformation.READLEVEL_KEY, readnessLevel));
}
// back color
if (Color.White != backColor)
{
parameters.Add(string.Format(parameterFormat, CaptchaImageTransformation.CAPTCHABACKCOLOR_KEY, backColor.ToArgb()));
}
return (0 < parameters.Count) ? string.Concat(dynamicImageQueryString, "&", string.Join("&", parameters.ToArray())) : dynamicImageQueryString;
}
