private static SelectClosestTraceResult SelectClosestTrace(Point2D from, LinkedList <Trace> traces)
{
SelectClosestTraceResult bestResult = new SelectClosestTraceResult();
double minDistance = double.MaxValue;
foreach (Trace trace in traces)
{
if (trace.IsLoop)
{
LoopDistanceResult distToLoop = DistanceToLoop(from, trace);
if (distToLoop.Value < minDistance)
{
minDistance = distToLoop.Value;
bestResult.LoopDistance = distToLoop;
bestResult.Trace = trace;
bestResult.NeedReverse = false;
}
}
else
{
double tostart = Utils.Distance(trace.Entities.First.Value.Info.Start, from);
double toend = Utils.Distance(trace.Entities.Last.Value.Info.End, from);
double distance = Math.Min(tostart, toend);
bool needReverse = toend < tostart;
if (distance < minDistance)
{
minDistance = distance;
bestResult.Trace = trace;
bestResult.NeedReverse = needReverse;
}
}
}
return(bestResult);
}
private static LoopDistanceResult DistanceToLoop(Point2D from, Trace trace)
{
LoopDistanceResult minDist = new LoopDistanceResult();
minDist.Value = double.MaxValue;
foreach (Entity ent in trace.Entities)
{
DistanceResult dist = ent.Distance(from);
if (minDist.Value > dist.Value)
{
minDist.Value = dist.Value;
minDist.Entity = ent;
minDist.Closest = dist.Closest;
minDist.PointType = dist.PointType;
}
}
return(minDist);
}
