How to paint a laser that shows the trajectory of the gun.

I want to see a laser representation of the gun aiming.. Basically a line 
that starts at the robot and ends at the point the gun is aiming at. Here 
is my code: 

public void onPaint(Graphics2D g){

                         int laserLength = 200;
                         double heading =getGunHeading();
                           
                        g.setColor(Color.RED);
                double x = Math.sin(Math.toRadians(heading)) * laserLength;
                        double y = Math.cos(Math.toRadians(heading)) * 
laserLength;
                g.drawLine((int)getX(),(int) getY(), (int)x,(int) y);

}

The laser starts at the robot but points to an irrelevant direction.

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