code: public void drawImage(Image img, double x, double y) {
  		this.gc.drawImage(img, doc2fxX(x), doc2fxY(y));
  	}
docs: Draws an image at the given x, y position using the width
  and height of the given image.
  A {@code null} image value or an image still in progress will be ignored.
  
  <p>This method will be affected by any of the
  global common attributes as specified in the
  Rendering Attributes Table of {@link GraphicsContext}.
  
  @param img the image to be drawn or null.
  @param x the X coordinate on the destination for the upper left of the image.
  @param y the Y coordinate on the destination for the upper left of the image.