public void ProlongStart_NoPoints_ShouldReturnOriginalLine()
{
var lineToProlong = new LineString(new [] { new Coordinate(0, 0), new Coordinate(1, 1) });
var results = _executor.ProlongLineStart(lineToProlong, new Coordinate[0], new List <LineString>(), 5, 200);
Assert.AreEqual(lineToProlong.Coordinates.Length, results.Coordinates.Length);
}
/// <summary>
/// This method is try to prolong all lines according to original GPS trace.
/// for each line it prolongs the start of the line unless the previous line was already prolonged to intersect it.
/// </summary>
/// <param name="linesToProlong"></param>
/// <param name="gpxItmLines"></param>
/// <returns></returns>
private async Task <List <ILineString> > ProlongLinesStartAccordingToOriginalGpx(List <ILineString> linesToProlong, List <ILineString> gpxItmLines)
{
var prolongedLines = new List <ILineString>();
var currentLineIndex = gpxItmLines.Count - 1;
var currentPositionIndex = gpxItmLines[currentLineIndex].Coordinates.Length - 1;
for (int lineIndex = linesToProlong.Count - 1; lineIndex >= 0; lineIndex--)
{
var prolongedLine = linesToProlong[lineIndex];
var previousLineToProlong = lineIndex > 0 ? linesToProlong[lineIndex - 1] : null;
if (previousLineToProlong != null && previousLineToProlong.Intersects(prolongedLine))
{
prolongedLines.Add(prolongedLine);
continue;
}
var currentCoordinate = prolongedLine.Coordinates.First();
UpdateIndexes(currentCoordinate, gpxItmLines, ref currentLineIndex, ref currentPositionIndex);
var originalCoordinates = gpxItmLines[currentLineIndex].Coordinates.Take(currentPositionIndex + 1).ToArray();
var lineStringInArea = await GetLineStringsInArea(new LineString(new[] { currentCoordinate, currentCoordinate }),
_options.MaximalProlongLineLength);
var prolongedLineStart = _gpxProlongerExecutor.ProlongLineStart(prolongedLine,
originalCoordinates,
lineStringInArea.Concat(prolongedLines).Concat(linesToProlong.Take(lineIndex)).ToArray(),
_options.DistanceToExisitngLineMergeThreshold,
_options.MaximalProlongLineLength);
prolongedLines.Add(prolongedLineStart);
}
prolongedLines.Reverse(); // reverse back to keep the original order of the lines
return(prolongedLines);
}