Indicator angle of tangent line

Hi

I'm trying to find out how to get the angel of the SMA slope, but my problem is that it's hard to find what the x-coordinate should be because they don't have a pip value like the y-coordinate does . Any suggestions on how I can do this 

Her is the code i have tried:

     protected override void OnStart()
        {

            double y = 1;//SMA LastValue difference to last bar.
            double x = 1;// Don't know :/
            var rad = Math.Atan(y / x);
            var deg = rad * 180 / Math.PI;

            Print(deg);
        }