public static void DrawCircles(this IDrawingContext renderer, IList <Point> points, double radius, Color fillColor, Color strokeColor,
double thickness = 1.0, PenLineJoin lineJoin = PenLineJoin.Miter, ICollection <double> dashArray = null, double dashOffset = 0, bool isHitTestVisible = false)
{
renderer.DrawEllipses(points, radius, radius, fillColor, strokeColor, thickness, lineJoin, dashArray, dashOffset, isHitTestVisible);
}