/// <summary>
/// Finds the distance between a point and the nearest edge of a polygon.
/// </summary>
/// <param name="pt">A point.</param>
/// <param name="verts">A set of vertices that define a polygon.</param>
/// <param name="nverts">The number of vertices to use from <c>verts</c>.</param>
/// <param name="edgeDist">A buffer for edge distances to be stored in.</param>
/// <param name="edgeT">A buffer for parametrization ratios to be stored in.</param>
/// <returns>A value indicating whether the point is contained in the polygon.</returns>
internal static bool PointToPolygonEdgeSquared(Vector3 pt, Vector3[] verts, int nverts, float[] edgeDist, float[] edgeT)
{
for (int i = 0, j = nverts - 1; i < nverts; j = i++)
{
edgeDist[j] = PointToSegment2DSquared(ref pt, ref verts[j], ref verts[i], out edgeT[j]);
}
return(Containment.PointInPoly(pt, verts, nverts));
}
//TOOD where did these come from?
/// <summary>
/// Finds the squared distance between a point and the nearest edge of a polygon.
/// </summary>
/// <param name="pt">A point.</param>
/// <param name="verts">A set of vertices that define a polygon.</param>
/// <param name="nverts">The number of vertices to use from <c>verts</c>.</param>
/// <returns>The squared distance between a point and the nearest edge of a polygon.</returns>
internal static float PointToPolygonEdgeSquared(Vector3 pt, Vector3[] verts, int nverts)
{
float dmin = float.MaxValue;
for (int i = 0, j = nverts - 1; i < nverts; j = i++)
{
dmin = Math.Min(dmin, Distance.PointToSegment2DSquared(ref pt, ref verts[j], ref verts[i]));
}
return(Containment.PointInPoly(pt, verts, nverts) ? -dmin : dmin);
}