settings_table = {
{
        name='time',
        arg='%M.%S',
        max=60,
        bg_colour=0xAAAAAA,
        bg_alpha=0.2,
        fg_colour=0xAAAAAA,
        fg_alpha=0.4,
        x=100, y=120,
        radius=56,
        thickness=5,
        start_angle=0,
        end_angle=360
    },
    {
        name='time',
        arg='%S',
        max=60,
        bg_colour=0xAAAAAA,
        bg_alpha=0.2,
        fg_colour=0xAAAAAA,
        fg_alpha=0.6,
        x=100, y=120,
        radius=62,
        thickness=5,
        start_angle=0,
        end_angle=360
    },
    {
        name='time',
        arg='%d',
        max=31,
        bg_colour=0xAAAAAA,
        bg_alpha=0.2,
        fg_colour=0xAAAAAA,
        fg_alpha=0.8,
        x=100, y=120,
        radius=70,
        thickness=5,
        start_angle=-90,
        end_angle=90
    },
    {
        name='time',
        arg='%m',
        max=12,
        bg_colour=0xAAAAAA,
        bg_alpha=0.2,
        fg_colour=0xAAAAAA,
        fg_alpha=1,
        x=100, y=120,
        radius=76,
        thickness=5,
        start_angle=-90,
        end_angle=90
    },
    {
        name='time',
        arg='%w',
        max=6,
        bg_colour=0xAAAAAA,
        bg_alpha=0.2,
        fg_colour=0xAAAAAA,
        fg_alpha=0.8,
        x=100, y=120,
        radius=70,
        thickness=5,
        start_angle=90,
        end_angle=270
    },
    {
        name='time',
        arg='%U',
        max=52,
        bg_colour=0xAAAAAA,
        bg_alpha=0.2,
        fg_colour=0xAAAAAA,
        fg_alpha=1,
        x=100, y=120,
        radius=76,
        thickness=5,
        start_angle=90,
        end_angle=270
    },
}


-- Use these settings to define the origin and extent of your clock.

clock_r=100

-- "clock_x" and "clock_y" are the coordinates of the centre of the clock, in pixels, from the top left of the Conky window.

clock_x=100
clock_y=120

show_seconds=true

require 'cairo'

function rgb_to_r_g_b(colour,alpha)
    return ((colour / 0x10000) % 0x100) / 255., ((colour / 0x100) % 0x100) / 255., (colour % 0x100) / 255., alpha
end

function draw_ring(cr,t,pt)
    local w,h=conky_window.width,conky_window.height

    local xc,yc,ring_r,ring_w,sa,ea=pt['x'],pt['y'],pt['radius'],pt['thickness'],pt['start_angle'],pt['end_angle']
    local bgc, bga, fgc, fga=pt['bg_colour'], pt['bg_alpha'], pt['fg_colour'], pt['fg_alpha']

    local angle_0=sa*(2*math.pi/360)-math.pi/2
    local angle_f=ea*(2*math.pi/360)-math.pi/2
    local t_arc=t*(angle_f-angle_0)

    -- Draw background ring

    cairo_arc(cr,xc,yc,ring_r,angle_0,angle_f)
    cairo_set_source_rgba(cr,rgb_to_r_g_b(bgc,bga))
    cairo_set_line_width(cr,ring_w)
    cairo_stroke(cr)

    -- Draw indicator ring

    cairo_arc(cr,xc,yc,ring_r,angle_0,angle_0+t_arc)
    cairo_set_source_rgba(cr,rgb_to_r_g_b(fgc,fga))
    cairo_stroke(cr)
end


function draw_clock_hands(cr,xc,yc)
    local secs,mins,hours,secs_arc,mins_arc,hours_arc
    local xh,yh,xm,ym,xs,ys

    secs=os.date("%S")
    mins=os.date("%M")
    hours=os.date("%I")

    secs_arc=(2*math.pi/60)*secs
    mins_arc=(2*math.pi/60)*mins+secs_arc/60
    hours_arc=(2*math.pi/12)*hours+mins_arc/12

    -- Draw hour hand

    xh=xc+0.7*clock_r*math.sin(hours_arc)
    yh=yc-0.7*clock_r*math.cos(hours_arc)
    cairo_move_to(cr,xc,yc)
    cairo_line_to(cr,xh,yh)

    cairo_set_line_cap(cr,CAIRO_LINE_CAP_ROUND)
    cairo_set_line_width(cr,5)
    cairo_set_source_rgba(cr,0.7,0.7,0.7,0.4)
    cairo_stroke(cr)

    -- Draw minute hand

    xm=xc+clock_r*math.sin(mins_arc)
    ym=yc-clock_r*math.cos(mins_arc)
    cairo_move_to(cr,xc,yc)
    cairo_line_to(cr,xm,ym)

    cairo_set_line_width(cr,3)
    cairo_stroke(cr)

    -- Draw seconds hand

    if show_seconds then
        xs=xc+clock_r*math.sin(secs_arc)
        ys=yc-clock_r*math.cos(secs_arc)
        cairo_move_to(cr,xc,yc)
        cairo_line_to(cr,xs,ys)

        cairo_set_line_width(cr,1)
        cairo_stroke(cr)
    end

    cairo_destroy(cr)
    cairo_surface_destroy(cs)
end



function conky_ring_stats()
    local function setup_rings(cr,pt)
        local str=''
        local value=0

        str=string.format('${%s %s}',pt['name'],pt['arg'])
        str=conky_parse(str)

        value=tonumber(str)
        pct=value/pt['max']

        draw_ring(cr,pct,pt)
    end


    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)

    local cr=cairo_create(cs)

    local updates=conky_parse('${updates}')
    update_num=tonumber(updates)

    if update_num>5 then
        for i in pairs(settings_table) do
            setup_rings(cr,settings_table[i])
        end
    end
    draw_clock_hands(cr,clock_x,clock_y)
end