private GpsCoordinate AsGps(Array array, string gpsDir)
{
if (array.Length != 3)
{
return(null);
}
GpsCoordinate gps = new GpsCoordinate();
if (array.GetValue(0) is Rational <uint> )
{
gps.Degrees = (Rational <uint>)array.GetValue(0);
}
else
{
gps.SetDegrees(Convert.ToDecimal(array.GetValue(0)));
}
if (array.GetValue(1) is Rational <uint> )
{
gps.Minutes = (Rational <uint>)array.GetValue(1);
}
else
{
gps.SetMinutes(Convert.ToDecimal(array.GetValue(1)));
}
if (array.GetValue(2) is Rational <uint> )
{
gps.Seconds = (Rational <uint>)array.GetValue(2);
}
else
{
gps.SetSeconds(Convert.ToDecimal(array.GetValue(2)));
}
try
{
gps.Direction = gpsDir;
}
catch { }
return(gps);
}
/// <summary>
///
/// </summary>
/// <returns></returns>
/// <remarks>
/// References:
/// http://www.media.mit.edu/pia/Research/deepview/exif.html
/// http://en.wikipedia.org/wiki/APEX_system
/// http://en.wikipedia.org/wiki/Exposure_value
/// </remarks>
protected string FormatValue()
{
object rawValue = this.Value;
switch (this.Tag)
{
case ExifTag.ISOSpeed:
{
if (rawValue is Array)
{
Array array = (Array)rawValue;
if (array.Length < 1 || !(array.GetValue(0) is IConvertible))
{
goto default;
}
rawValue = array.GetValue(0);
}
if (!(rawValue is IConvertible))
{
goto default;
}
return(String.Format("ISO-{0:###0}", Convert.ToDecimal(rawValue)));
}
case ExifTag.Aperture:
case ExifTag.MaxAperture:
{
// The actual aperture value of lens when the image was taken.
// To convert this value to ordinary F-number(F-stop),
// calculate this value's power of root 2 (=1.4142).
// For example, if value is '5', F-number is 1.4142^5 = F5.6.
double fStop = Math.Pow(2.0, Convert.ToDouble(rawValue) / 2.0);
return(String.Format("f/{0:#0.0}", fStop));
}
case ExifTag.FNumber:
{
// The actual F-number (F-stop) of lens when the image was taken.
return(String.Format("f/{0:#0.0}", Convert.ToDecimal(rawValue)));
}
case ExifTag.FocalLength:
case ExifTag.FocalLengthIn35mmFilm:
{
return(String.Format("{0:#0.#} mm", Convert.ToDecimal(rawValue)));
}
case ExifTag.ShutterSpeed:
{
if (!(rawValue is Rational <int>))
{
goto default;
}
// To convert this value to ordinary 'Shutter Speed';
// calculate this value's power of 2, then reciprocal.
// For example, if value is '4', shutter speed is 1/(2^4)=1/16 second.
Rational <int> shutter = (Rational <int>)rawValue;
if (shutter.Numerator > 0)
{
double speed = Math.Pow(2.0, Convert.ToDouble(shutter));
return(String.Format("1/{0:####0} sec", speed));
}
else
{
double speed = Math.Pow(2.0, -Convert.ToDouble(shutter));
return(String.Format("{0:####0.##} sec", speed));
}
}
case ExifTag.ExposureTime:
{
if (!(rawValue is Rational <uint>))
{
goto default;
}
// Exposure time (reciprocal of shutter speed). Unit is second.
Rational <uint> exposure = (Rational <uint>)rawValue;
if (exposure.Numerator < exposure.Denominator)
{
exposure.Reduce();
return(String.Format("{0} sec", exposure));
}
else
{
return(String.Format("{0:####0.##} sec", Convert.ToDecimal(rawValue)));
}
}
case ExifTag.XResolution:
case ExifTag.YResolution:
case ExifTag.ThumbnailXResolution:
case ExifTag.ThumbnailYResolution:
case ExifTag.FocalPlaneXResolution:
case ExifTag.FocalPlaneYResolution:
{
return(String.Format("{0:###0} dpi", Convert.ToDecimal(rawValue)));
}
case ExifTag.ImageHeight:
case ExifTag.ImageWidth:
case ExifTag.CompressedImageHeight:
case ExifTag.CompressedImageWidth:
case ExifTag.ThumbnailHeight:
case ExifTag.ThumbnailWidth:
{
return(String.Format("{0:###0} pixels", Convert.ToDecimal(rawValue)));
}
case ExifTag.SubjectDistance:
{
return(String.Format("{0:###0.#} m", Convert.ToDecimal(rawValue)));
}
case ExifTag.ExposureBias:
case ExifTag.Brightness:
{
string val;
if (rawValue is Rational <int> )
{
val = ((Rational <int>)rawValue).Numerator != 0 ? rawValue.ToString() : "0";
}
else
{
val = Convert.ToDecimal(rawValue).ToString();
}
return(String.Format("{0} EV", val));
}
case ExifTag.CompressedBitsPerPixel:
{
return(String.Format("{0:###0.0} bits", Convert.ToDecimal(rawValue)));
}
case ExifTag.DigitalZoomRatio:
{
return(Convert.ToString(rawValue).Replace('/', ':'));
}
case ExifTag.GpsLatitude:
case ExifTag.GpsLongitude:
case ExifTag.GpsDestLatitude:
case ExifTag.GpsDestLongitude:
{
if (!(rawValue is Array))
{
goto default;
}
Array array = (Array)rawValue;
if (array.Length < 1)
{
return(String.Empty);
}
else if (array.Length != 3)
{
goto default;
}
// attempt to use the GPSCoordinate XMP formatting guidelines
GpsCoordinate gps = new GpsCoordinate();
if (array.GetValue(0) is Rational <uint> )
{
gps.Degrees = (Rational <uint>)array.GetValue(0);
}
else
{
gps.SetDegrees(Convert.ToDecimal(array.GetValue(0)));
}
if (array.GetValue(1) is Rational <uint> )
{
gps.Minutes = (Rational <uint>)array.GetValue(1);
}
else
{
gps.SetMinutes(Convert.ToDecimal(array.GetValue(1)));
}
if (array.GetValue(2) is Rational <uint> )
{
gps.Seconds = (Rational <uint>)array.GetValue(2);
}
else
{
gps.SetSeconds(Convert.ToDecimal(array.GetValue(2)));
}
return(gps.ToString());
}
case ExifTag.GpsTimeStamp:
{
Array array = (Array)rawValue;
if (array.Length < 1)
{
return(String.Empty);
}
string[] time = new string[array.Length];
for (int i = 0; i < array.Length; i++)
{
time[i] = Convert.ToDecimal(array.GetValue(i)).ToString();
}
return(String.Join(":", time));
}
default:
{
if (rawValue is Enum)
{
string description = Utility.GetDescription((Enum)rawValue);
if (!String.IsNullOrEmpty(description))
{
return(description);
}
}
else if (rawValue is Array)
{
Array array = (Array)rawValue;
if (array.Length < 1)
{
return(String.Empty);
}
Type type = array.GetValue(0).GetType();
if (!type.IsPrimitive || type == typeof(char) || type == typeof(float) || type == typeof(double))
{
return(Convert.ToString(rawValue));
}
//const int ElemsPerRow = 40;
int charSize = 2 * System.Runtime.InteropServices.Marshal.SizeOf(type);
string format = "{0:X" + (charSize) + "}";
StringBuilder builder = new StringBuilder(((charSize + 1) * array.Length) /*+(2*array.Length/ElemsPerRow)*/);
for (int i = 0; i < array.Length; i++)
{
if (i > 0)
{
//if ((i+1)%ElemsPerRow == 0)
//{
// builder.AppendLine();
//}
//else
{
builder.Append(" ");
}
}
builder.AppendFormat(format, array.GetValue(i));
}
return(builder.ToString());
}
return(Convert.ToString(rawValue));
}
}
}