internal static IEnumerable<ImageSample> GetNegativeSamples(List<FileAccess.FileEntry> fileList, int numNegative)
{
var negatives = new ImageSample[numNegative];
var fileIter = fileList.GetEnumerator();
var intIter = new PermutedSequence(fileList.Max(entry => entry.Window.NumWindows));
try
{
intIter.MoveNext();
var i = 0;
while (i < numNegative)
{
if (fileIter.MoveNext())
{
if (fileIter.Current == null) continue;
Rectangle rect;
try
{
rect = fileIter.Current.Window.GetRectangle(intIter.Current);
}
catch (ArgumentOutOfRangeException)
{
continue;
}
if (!fileIter.Current.Rectangles.Any(rect.Overlaps))
{
negatives[i] = new ImageSample(fileIter.Current.FileName, intIter.Current,
fileIter.Current.Window);
i++;
}
}
else
{
fileIter.Dispose();
fileIter = fileList.GetEnumerator();
if (!intIter.MoveNext()) throw new CryptographicUnexpectedOperationException("Not enough integers.");
}
}
return negatives;
}
finally
{
fileIter.Dispose();
intIter.Dispose();
}
}
public bool FileEquals(ImageSample other)
{
return other != null && FileName.Equals(other.FileName);
}