code: public void quadraticCurveTo(double xc, double yc, double x1, double y1) {
  		this.gc.quadraticCurveTo(
  				doc2fxX(xc), doc2fxY(yc),
  				doc2fxX(x1), doc2fxY(y1));
  	}
docs: Adds segments to the current path to make a quadratic Bezier curve.
  The coordinates are transformed by the current transform as they are
  added to the path and unaffected by subsequent changes to the transform.
  The current path is a path attribute
  used for any of the path methods as specified in the
  Rendering Attributes Table of {@link GraphicsContext}
  and <b>is not affected</b> by the {@link #save()} and
  {@link #restore()} operations.
  
  @param xc the X coordinate of the control point
  @param yc the Y coordinate of the control point
  @param x1 the X coordinate of the end point
  @param y1 the Y coordinate of the end point