@Pure
	public double fx2docAngle(double angle) {
		final ZoomableCanvas<?> canvas = getCanvas();
		if (canvas.isInvertedAxisX() != canvas.isInvertedAxisY()) {
			return -angle;
		}
		return angle;
	}
@ Pure public double fx2docAngle ( double angle ) { final ZoomableCanvas < ? > canvas = getCanvas ( ) ; if ( canvas . isInvertedAxisX ( ) != canvas . isInvertedAxisY ( ) ) { return - angle ; } return angle ; }
Transform a JavaFX angle to its document equivalent.

@param angle the JavaFX angle.
@return the document angle.