// Adds the polygon's points to the first point group that shares a point with the polygon.
// If any other groups share a point with the polygon, those groups are merged into the first group as well,
// and are removed from their previous positions in the list.
// Returns the index of the merged (or new) group.
public static int MergeIntoPointGroups(this DTPolygon poly, List <HashSet <Vector2> > pointGroups)
{
// Don't bother checking holes
return(poly.Contour.MergeIntoPointGroups(pointGroups));
}
// Returns the index of the first group that shares a point with this polygon.
public static int GetFirstPointGroupIndex(this DTPolygon poly, IDictionary <Vector2, int> pointToGroup)
{
// Don't bother checking hole points
return(poly.Contour.GetFirstPointGroupIndex(pointToGroup));
}
// Returns true given group shares a point with this polygon.
public static bool BelongsToPointGroup(this DTPolygon poly, HashSet <Vector2> points)
{
// Don't bother checking holes
return(poly.Contour.BelongsToPointGroup(points));
}
// Returns the index of the first group that shares a point with this polygon.
public static int GetFirstPointGroupIndex(this DTPolygon poly, IEnumerable <ISet <Vector2> > pointGroups)
{
// Don't bother checking hole points
return(poly.Contour.GetFirstPointGroupIndex(pointGroups));
}