code: public void strokeArc(double x, double y, double width, double height,
  			double startAngle, double arcExtent, ArcType closure) {
  		this.gc.strokeArc(
  				doc2fxX(x), doc2fxY(y),
  				doc2fxSize(width), doc2fxSize(height),
  				doc2fxAngle(Math.toDegrees(startAngle)),
  				doc2fxAngle(Math.toDegrees(arcExtent)),
  				closure);
  	}
docs: Strokes an Arc using the current stroke paint. A {@code null} ArcType or
  non positive width or height will cause the render command to be ignored.
  
  <p>This method will be affected by any of the
  global common or stroke attributes as specified in the
  Rendering Attributes Table of {@link GraphicsContext}.
  
  @param x the X coordinate of the arc.
  @param y the Y coordinate of the arc.
  @param width the width of the arc.
  @param height the height of the arc.
  @param startAngle the starting angle of the arc in degrees.
  @param arcExtent arcExtent the angular extent of the arc in degrees.
  @param closure closure type (Round, Chord, Open) or null