'宣言 Public Shared Function IsPointNearArcSegment( _ ByVal targetPoint As Point, _ ByVal currStart As Point, _ ByVal currSegment As ArcSegment, _ ByVal closeness As Double _ ) As Tuple(Of Boolean,Point)
public static Tuple<bool,Point> IsPointNearArcSegment( Point targetPoint, Point currStart, ArcSegment currSegment, double closeness )