conky and cairo

function conky_render()

if conky_window == nil then return end
local cs = cairo_xlib_surface_create(conky_window.display, conky_window.drawable, conky_window.visual, conky_window.width, conky_window.height)
cr = cairo_create(cs)
local updates=tonumber(conky_parse('${updates}'))
line_width=10
line_cap=CAIRO_LINE_CAP_BUTT
red=1
green=1
blue=200
alpha=1
startx=200
starty=100

if updates>1 then

cairo_set_source_rgba (cr,red,green,blue,alpha)
cairo_stroke (cr)
cairo_move_to (cr,startx,starty)
cairo_set_line_width (cr,line_width)
cairo_set_line_cap (cr, line_cap)

--cairo_line_to (cr,200,100)
--cairo_rel_line_to (cr,100,200)
cairo_line_to (cr,100,100)
--cairo_rel_line_to (cr,50,2)
cairo_stroke (cr)

end
end