public static Line2D lineRotatedBy(Line2D line, double radians)
{
double returnX = line.getX2() - line.getX1();
double returnY = line.getY2() - line.getY1();
double cosineTheta = Math.cos(radians);
double sineTheta = Math.sin(radians);
Point2D returnPoint = new Point2D.Double(
(returnX * cosineTheta - returnY * sineTheta),
(returnX * sineTheta + returnY * cosineTheta)
);
return(new Line2D.Double(
0,
0,
returnPoint.getX(),
returnPoint.getY()
));
}