Setting Line _RGB colours

[PhilOfPerth]

How can I convert this line:
Line (H, V)-(H+ 37, V+ 38), _RGB(200, 200, 200), BF
to set the _RGB colour to a colour in a sub, instead of this fixed colour?  (I'm using a _NewImage 32-bit screen)
Sub Red might contain Color: _RGB(255,0,0)

   The _RGB(r,g,b) function returns a long.    You can pass that in as a parameter to the function


SUB Myline(MyColor&)

    Line (H, V)-(H+ 37, V+ 38), MyColor&, BF

END SUB

Thank you. That looks pretty straightforward. I'll try that.