/// <summary>
/// Tests whether a triangular ring would be eroded completely by the given
/// buffer distance.
/// This is a precise test. It uses the fact that the inner buffer of a
/// triangle converges on the inCentre of the triangle (the point
/// equidistant from all sides). If the buffer distance is greater than the
/// distance of the inCentre from a side, the triangle will be eroded completely.
/// This test is important, since it removes a problematic case where
/// the buffer distance is slightly larger than the inCentre distance.
/// In this case the triangle buffer curve "inverts" with incorrect topology,
/// producing an incorrect hole in the buffer.
/// </summary>
/// <param name="triangleCoord"></param>
/// <param name="bufferDistance"></param>
/// <returns></returns>
private bool IsTriangleErodedCompletely(IList <Coordinate> triangleCoord, double bufferDistance)
{
Triangle tri = new Triangle(triangleCoord[0], triangleCoord[1], triangleCoord[2]);
Coordinate inCentre = tri.InCentre;
double distToCentre = CgAlgorithms.DistancePointLine(inCentre, tri.P0, tri.P1);
return(distToCentre < Math.Abs(bufferDistance));
}
/// <summary>
/// Computes the distance between this line segment and a point.
/// </summary>
public virtual double Distance(Coordinate p)
{
return(CgAlgorithms.DistancePointLine(new Coordinate(p), P0, P1));
}