code: public void drawCircle(Object parent, String name, Coordinate position, double radius, ShapeStyle style) {
  		if (isAttached()) {
  			Element circle = helper.createOrUpdateElement(parent, name, "circle", style);
  			Dom.setElementAttribute(circle, "cx", Integer.toString((int) position.getX()));
  			Dom.setElementAttribute(circle, "cy", Integer.toString((int) position.getY()));
  			Dom.setElementAttribute(circle, "r", Integer.toString((int) radius));
  		}
  	}
docs: Draw a circle on the <code>GraphicsContext</code>.
  
  @param parent
  parent group object
  @param name
  The circle's name.
  @param position
  The center position as a coordinate.
  @param radius
  The circle's radius.
  @param style
  The styling object by which the circle should be drawn.