private bool FindTrasingData(Segment l, ref TracingData data)
{
var intersections = new Dictionary <Vector2, int>();
var inDistances = new Dictionary <float, Vector2>();
var outDistances = new Dictionary <float, Vector2>();
for (var i = 0; i < Segments.Length; i++)
{
var segment = Segments[i];
var intersectPoint = new Vector2();
var isIntersects = Vector2.SegmentToSegmentIntersection(l.Start, l.End, segment.Start, segment.End, ref intersectPoint);
if (!isIntersects)
{
continue;
}
intersections[intersectPoint] = i;
inDistances[Vector2.Distance(intersectPoint, l.Start)] = intersectPoint;
outDistances[Vector2.Distance(intersectPoint, l.End)] = intersectPoint;
}
if (intersections.Count == 0)
{
return(false);
}
data.InPoint = inDistances[inDistances.Keys.Min()];
data.OutPoint = outDistances[outDistances.Keys.Min()];
data.InSegmentIndex = intersections[data.InPoint];
data.OutSegmentIndex = intersections[data.OutPoint];
return(true);
}
public List <Vector2> WayAround(Segment l)
{
var td = new TracingData();
if (!FindTrasingData(l, ref td))
{
return(new List <Vector2>());
}
var toEndPath = new List <Vector2>();
var toEndPathLen = 0.0;
toEndPath.Add(td.InPoint);
for (var i = td.InSegmentIndex; i != td.OutSegmentIndex; i = (i + 1) % Segments.Length)
{
var newP = Segments[i].End;
toEndPathLen += Vector2.Distance(toEndPath.Last(), newP);
toEndPath.Add(newP);
}
toEndPathLen += Vector2.Distance(toEndPath.Last(), td.OutPoint);
toEndPath.Add(td.OutPoint);
var toStartPath = new List <Vector2>();
var toStartPathLen = 0.0;
toStartPath.Add(td.InPoint);
for (var i = td.InSegmentIndex; i != td.OutSegmentIndex; i = i == 0 ? Segments.Length - 1 : i - 1)
{
var newP = Segments[i].Start;
toStartPathLen += Vector2.Distance(toStartPath.Last(), newP);
toStartPath.Add(newP);
}
toStartPathLen += Vector2.Distance(toStartPath.Last(), td.OutPoint);
toStartPath.Add(td.OutPoint);
return(toStartPathLen < toEndPathLen ? toStartPath : toEndPath);
}
