public void WriteTo(ExifProfile profile)
{
if (!double.IsNaN(Distance) && Distance > 0)
{
var value = Distance == Double.PositiveInfinity ? new Rational(0xffffffff, 1) : new Rational(Distance);
profile.ClearValue(ExifTag.SubjectDistance);
profile.SetValue(ExifTag.SubjectDistance, value);
}
if (Range != DistanceRange.Unknown)
{
profile.ClearValue(ExifTag.SubjectDistanceRange);
profile.SetValue(ExifTag.SubjectDistanceRange, (ushort)Range);
}
profile.ClearValue(ExifTag.SubjectLocation);
profile.ClearValue(ExifTag.SubjectArea);
if (Size.HasValue)
{
var rect = new ushort[] { (ushort)Center.X, (ushort)Center.Y, (ushort)Size.Value.Width, (ushort)Size.Value.Height };
profile.SetValue(ExifTag.SubjectArea, rect);
}
else if (Diameter.HasValue)
{
var circle = new ushort[] { (ushort)Center.X, (ushort)Center.Y, (ushort)Diameter.Value };
profile.SetValue(ExifTag.SubjectArea, circle);
}
else
{
var origin = new ushort[] { (ushort)Center.X, (ushort)Center.Y };
profile.SetValue(ExifTag.SubjectArea, origin);
}
if (true) // apparently SubjectLocation is outdated and superseded by SubjectArea, but we write it anyway for backwards compatibility
{
var origin = new ushort[] { (ushort)Center.X, (ushort)Center.Y };
profile.SetValue(ExifTag.SubjectLocation, origin);
}
}