/// <summary>
/// Gets line ends near the point by radius.
/// does not support large distances as it only gets a small number of grid cells
/// </summary>
/// <returns>a sorted array of lines where 0 is the closest point within the radius</returns>
protected GameLine[] LineEndsInRadius(TrackReader trk, Vector2d point, double rad)
{
var lines =
trk.GetLinesInRect(new DoubleRect(point - new Vector2d(24, 24), new Vector2d(24 * 2, 24 * 2)),
false);
SortedList <double, List <GameLine> > ret = new SortedList <double, List <GameLine> >();
foreach (var line in lines)
{
var p1 = (point - line.Position).Length;
var p2 = (point - line.Position2).Length;
var closer = Math.Min(p1, p2);
if (closer - line.Width < rad)
{
if (ret.ContainsKey(closer))
{
ret[closer].Add(line);
}
else
{
var l = new List <GameLine>();
l.Add(line);
ret[closer] = l;
}
}
}
List <GameLine> retn = new List <GameLine>();
for (int i = 0; i < ret.Values.Count; i++)
{
retn.AddRange(ret.Values[i]);
}
return(retn.ToArray());
}
protected IEnumerable <GameLine> SelectLines(TrackReader trk, Vector2d position)
{
var ends = LineEndsInRadius(trk, position, SnapRadius);
foreach (var line in ends)
{
yield return(line);
}
var zoom = game.Track.Zoom;
var lines =
trk.GetLinesInRect(
new DoubleRect((Vector2d)position - new Vector2d(24, 24),
new Vector2d(24 * 2, 24 * 2)),
false);
foreach (var line in lines)
{
if (ends.Contains(line))
{
continue;
}
double lnradius = line.Width;
var angle = Angle.FromLine(line.Position, line.Position2);
var rect = Utility.GetThickLine(
line.Position,
line.Position2,
angle,
lnradius * 2);
if (Utility.PointInRectangle(rect, position))
{
yield return(line);
}
}
yield break;
}
