/// <summary>
/// Filters the log file based on <see cref="shipLoc"/> and the sector range listed in <see cref="textRange.Text"/>.</summary>
/// Range calculation is simplified into a box shape for speed; min and max sector values are calculated for all three axis and the Map Log coordinates are kept if they fit in this box.
private bool filterLog()
{
// Temporary storage for the new contents of the log file
MapList tempLog = new MapList ();
int range = MapPoint.intParse (txtRange.Text);
// calculate sector ranges (+1 to make the range inclusive)
int xmin = (int)shipLoc [0] - (range + 1);
int xmax = (int)shipLoc [0] + (range + 1);
int ymin = (int)shipLoc [1] - (range + 1);
int ymax = (int)shipLoc [1] + (range + 1);
int zmin = (int)shipLoc [2] - (range + 1);
int zmax = (int)shipLoc [2] + (range + 1);
// search for Map Log entries that are within the specified range
foreach (MapPoint point in lstMasterLog) {
if (point.sx > xmin && point.sx < xmax &&
point.sy > ymin && point.sy < ymax &&
point.sz > zmin && point.sz < zmax) {
tempLog.Add (point);
}
}
// sort the new list, if desired
if (chkSort.Active && sortNeeded) {
tempLog.Sort (sorter);
sortNeeded = false;
}
// convert the new list into a string before opening the file for write (minimize the time the file is open)
string tempLogText = tempLog.ToString();
// Replace the Map Log with the filtered resaults
try {
// delete the contents of the file before re-writing it. It's the easy way to ensure the file is overwritten and not appended to.
deleteFile(btnMapLog.Label);
using (System.IO.StreamWriter newLog = new System.IO.StreamWriter(OpenFile(btnMapLog.Label,true))) {
newLog.Write(tempLog.ToString());
newLog.Close();
// remember what was written
textMapLogFile = tempLogText;
// remember when the file was last written
lastLogged = getLastWriteTimeUTC(btnMapLog.Label);
}
} catch (System.ArgumentNullException) {
// OpenFile should have already given an error message since OpenFile() returns null on error
}
return true;
}