2D Game with classes : background issue

[CodeONE]

ALLEGRO with c++

I have a 800x400 display

In which I have drawn a horizontal line

void Ground::Render()
{
	al_draw_line(x,y,800+x,y,al_map_rgb(0,255,0),10);  //x=0 , y=330
	
}

A ball is continuously moving on this line . I used transformation to keep the ball at the centre of screen.

After a while ball moves into black screen space as the line was drawn only till x=800 . Line doesnt exist beyond x=800 position.

Is there a way so that I can loop this line to appear continuously ,like forever? As long as ball is moving.

[Disch]

option 1) Have the line move along with the ball

option 2) Draw the line without any transformations.