aymara's Arch Linux Blog

This script draws percentage meters as rings, and also draws clock hands if you want! It is fully customisable; all options are described in the script. This script is based off a combination of my clock.lua script and my rings.lua script.

IMPORTANT: if you are using the 'cpu' function, it will cause a segmentation fault if it tries to draw a ring straight away. The if statement on line 145 uses a delay to make sure that this doesn't happen. It calculates the length of the delay by the number of updates since Conky started. Generally, a value of 5s is long enough, so if you update Conky every 1s, use update_num>5 in that if statement (the default). If you only update Conky every 2s, you should change it to update_num>3; conversely if you update Conky every 0.5s, you should use update_num>10. ALSO, if you change your Conky, is it best to use "killall conky; conky" to update it, otherwise the update_num will not be reset and you will get an error.

To call this script in Conky, use the following (assuming that you save this script to ~/scripts/rings.lua):
lua_load ~/scripts/clock_rings.lua
lua_draw_hook_pre clock_rings

Changelog:
+ v1.0 -- Original release (30.09.2009)
]]

settings_table = {
{
name='cpu',
arg='cpu0',
max=100,
bg_colour=0x353535,
bg_alpha=0,
fg_colour=0x353535,
fg_alpha=0.8,
x=195, y=195,
radius=137.5,
thickness=15,
start_angle=0,
end_angle=360
},
{
name='memperc',
arg='',
max=100,
bg_colour=0xd8d8d8,
bg_alpha=0.1,
fg_colour=0xd8d8d8,
fg_alpha=0.5,
x=195, y=195,
radius=157,
thickness=13,
start_angle=0,
end_angle=360
},
{
name='fs_used_perc',
arg='/',
max=100,
bg_colour=0x353535,
bg_alpha=0,
fg_colour=0x353535,
fg_alpha=0.5,
x=195, y=195,
radius=100,
thickness=20,
start_angle=0,
end_angle=360
},
{
name='battery_percent',
arg='BAT0',
max=100,
bg_colour=0x353535,
bg_alpha=0.4,
fg_colour=0xd8d8d8,
fg_alpha=1,
x=195, y=195,
radius=120,
thickness=10,
start_angle=0,
end_angle=360
},
{
name='wireless_link_qual_perc',
arg='wlan0',
max=100,
bg_colour=0x353535,
bg_alpha=0.1,
fg_colour=0x353535,
fg_alpha=0.9,
x=195, y=195,
radius=80,
thickness=12.5,
start_angle=0,
end_angle=360
},
{
name='time',
arg='%I',
max=12,
bg_colour=0x868686,
bg_alpha=0.1,
fg_colour=0x868686,
fg_alpha=0.9,
x=195, y=195,
radius=28,
thickness=3.5,
start_angle=0,
end_angle=360
},
{
name='time',
arg='%M',
max=60,
bg_colour=0x868686,
bg_alpha=0.1,
fg_colour=0x868686,
fg_alpha=0.95,
x=195, y=195,
radius=33,
thickness=3.5,
start_angle=0,
end_angle=360
},
{
name='time',
arg='%S',
max=60,
bg_colour=0x868686,
bg_alpha=0.1,
fg_colour=0x868686,
fg_alpha=1.0,
x=195, y=195,
radius=13.5,
thickness=23,
start_angle=0,
end_angle=360
},
}

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

clock_r=125

-- "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=195
clock_y=195

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,1,1,1,0.8)
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
end

function conky_clock_rings()
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

-- Check that Conky has been running for at least 5s

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

# -- Lua load -- #
lua_load ~/clock.lua
lua_draw_hook_pre clock_rings

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