Horizontal line indicator that covers full screen width

 
Hello seniors, being a newbie I have been able to create an indicator that draws a horizontal line using the SetIndexStyle(0,DRAW_LINE) and counted_bars=IndicatorCounted() etc. It draws the line as I want, but stop at the last bar on the screen. But my chart is shifted to the left and I want the line to run to the right extreme of the screen. How can I do that? I appreciate your help alot and sorry for my English.
Reason: