/// <summary>
/// Given the specified test point, this checks each segment, and will
/// return the closest point on the specified segment.
/// </summary>
/// <param name="testPoint">The point to test.</param>
/// <returns></returns>
public override Coordinate ClosestPoint(Coordinate testPoint)
{
// For a point outside the polygon, it must be closer to the shell than
// any holes.
if (Intersects(new Point(testPoint)) == false)
{
return(_shell.ClosestPoint(testPoint));
}
Coordinate closest = _shell.ClosestPoint(testPoint);
double dist = testPoint.Distance(closest);
foreach (ILinearRing ring in Holes)
{
Coordinate temp = ring.ClosestPoint(testPoint);
double tempDist = testPoint.Distance(temp);
if (tempDist >= dist)
{
continue;
}
dist = tempDist;
closest = temp;
}
return(closest);
}