private static void EncodeRow(BitWriter bw, IEnumerable <IStaticEntity> rowTracks)
{
// Go through this row
var row = rowTracks.OfType <Track>().ToDictionary(x => x.Column, x => x.Direction);
int lastCol = row.Keys.Max();
TrackEncoding lastDir = TrackEncoding.Blank;
int lastDirCount = 0;
for (int c = 0; c <= lastCol; c++)
{
TrackEncoding currentDir = TrackEncoding.Blank;
if (row.ContainsKey(c))
{
currentDir = s_directionMap.Single(x => x.Value == row[c]).Key;
}
if (currentDir == lastDir)
{
lastDirCount++;
}
else
{
if (lastDirCount > 0)
{
WriteOutTrack(bw, lastDir, lastDirCount);
}
lastDirCount = 1;
lastDir = currentDir;
}
}
if (lastDirCount > 0)
{
WriteOutTrack(bw, lastDir, lastDirCount);
}
}
private static void WriteOutTrack(BitWriter bw, TrackEncoding direction, int count)
{
if (direction == TrackEncoding.Blank)
{
// Empty is 2, RepeatEmpty is 5 + 2, Only saves if we more than 3
WriteMultiple(bw, count, 3, x => x.WriteEmpty());
}
else
{
// Track is 6, RepeatTrack is 5 + 6, Only saves if we more than 1
WriteMultiple(bw, count, 1, x => x.WriteTrack(direction));
}
}
public void WriteTrack(TrackEncoding track)
{
Write(0, 1);
Write4BitInt((int)track);
}
