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conkygraph
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  1. 15
      README
  2. 210
      conkygraph.lua
  3. 21
      example1/conkyrc
  4. 162
      example1/graphs.json

15
README
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conkygraph is a lua script for drawing graphs in conky using cairo.
REQUIREMENTS:
* conky
* lua
* lua-cairo
* lua-json
* lua-lfs (lua-filesystem)
USAGE:
1. Create a (or use a existing) file containing data about the graphs in json format.
2. Add the following to your conkyrc:
lua_load /path/to/conkygraph.lua
lua_startup_hook load_graphs /path/to/graphs_data.json
lua_draw_hook_pre draw_graphs

210
conkygraph.lua
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-- This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/ or send a letter to Creative Commons, 171 Second Street, Suite 300, San Francisco, California, 94105, USA.
function antialias( cr, antialias )
require( "cairo" )
if antialias then
cairo_set_antialias( cr, CAIRO_ANTIALIAS_DEFAULT )
else
cairo_set_antialias( cr, CAIRO_ANTIALIAS_NONE )
end
end
function rgb_to_r_g_b( color, alpha )
local c = tonumber( "0x" .. color )
return ( ( c / 0x10000 ) % 0x100 ) / 255.0, ( ( c / 0x100 ) % 0x100 ) / 255.0, ( c % 0x100 ) / 255.0, alpha
end
function cairo_graph( cr, x, y, width, height, f )
require( "cairo" )
local function value_to_y( height, value )
if height ~= nil and value ~= nil then
return height * ( 1 - value )
end
return 0
end
if f.data ~= nil and #f.data > 0 then
local x2 = x + width
local nx = x2
cairo_move_to( cr, x2, y + value_to_y( height, f.data[1] ) )
-- Drawn from right to left
local curve_to = cairo_line_to
for i, v in pairs( f.data ) do
nx = nx - f.dx
if nx >= x then
curve_to( cr, nx, y + value_to_y( height, v ) )
else
break
end
end
antialias( cr, f.antialias )
cairo_set_source_rgba( cr, rgb_to_r_g_b( f.stroke_color, 1 ) )
cairo_set_line_width( cr, f.stroke_width )
if f.fill then
cairo_stroke_preserve( cr )
cairo_line_to( cr, nx, y + height )
cairo_line_to( cr, x2, y + height )
cairo_close_path( cr )
cairo_set_source_rgba( cr, rgb_to_r_g_b( f.fill_color, f.fill_alpha ) )
cairo_fill( cr )
else
cairo_stroke( cr )
end
end
end
------------------------------------------------------------------------------------------------------------------------
function draw_graph( cr, x, y, width, height, graph )
if conky_window == nil or graph == nil then
return
end
local function push( t, v, c )
while #t > c do
table.remove( t, #t )
end
table.insert( t, 1, v )
end
-- Find margins, sizes and positions
local x_outer = tonumber( x ) + conky_window.text_start_x
local y_outer = tonumber( y ) + conky_window.text_start_y
local w_outer = tonumber( width )
if w_outer == 0 then
w_outer = conky_window.text_width - x
end
local h_outer = tonumber( height )
if h_outer == 0 then
h_outer = conky_window.text_height - y
end
local x_inner = x_outer
local y_inner = y_inner
local w_inner = w_outer
local h_inner = h_outer
if graph.outline then
local o = graph.outline_width
x_inner = x_outer + o
y_inner = y_outer + o
local o2 = o * 2
w_inner = w_outer - o2
h_inner = h_outer - o2
end
require( "cairo" )
cairo_rectangle( cr, x_inner, y_inner, w_inner, h_inner )
cairo_clip( cr )
for i, f in pairs( graph.functions ) do
if f.data == nil then
f.data = {}
end
local pixels_per_value = w_inner / f.dx
local str = conky_parse( f.conky_variable )
local val = tonumber( str )
if val ~= nil then
if f.record_max then
if val > f.max_value then
f.max_value = val
else
for i, v in pairs( f.data ) do
if v > f.max_value then
f.max_value = v
end
end
end
end
push( f.data, val / f.max_value, pixels_per_value )
end
cairo_graph( cr, x_inner, y_inner, w_inner, h_inner, f )
end
cairo_reset_clip( cr )
if graph.outline then
cairo_set_source_rgba( cr, rgb_to_r_g_b( graph.outline_color, graph.outline_alpha ) )
cairo_rectangle( cr, x_outer, y_outer, w_outer, h_outer )
antialias( cr, graph.outline_antialias )
cairo_set_line_width( cr, graph.outline_width )
cairo_stroke( cr )
end
end
function conky_load_graphs( file )
function json_decode_file( file )
local json = require( "json" )
local t = {}
for line in io.lines( file ) do
t[#t + 1] = line
end
local str = table.concat( t, "\n" )
return json.decode( str )
end
local lfs = require( "lfs" )
mod_time = lfs.attributes( file, "modification" )
graphs_file = file
graphs = json_decode_file( file )
end
function is_file_dirty( file )
local lfs = require( "lfs" )
local tmp = lfs.attributes( file, "modification" )
if tmp ~= mod_time then
mod_time = tmp
return true
end
return false
end
function conky_draw_graphs()
if conky_window == nil then
return
end
if is_file_dirty( graphs_file ) then
print( "Reloading " .. graphs_file .. "..." )
conky_load_graphs( graphs_file )
end
if graphs == nil then
return
end
require( "cairo" )
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 )
cairo_set_line_join( cr, CAIRO_LINE_JOIN_ROUND )
for k, v in pairs( graphs ) do
draw_graph( cr, v.x, v.y, v.width, v.height, v )
end
cairo_destroy( cr )
end

21
example1/conkyrc
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alignment top_right
background yes
border_width 0
double_buffer yes
draw_borders no
gap_x 10
gap_y 10
own_window_hints undecorated,below,sticky,skip_taskbar
own_window_transparent yes
own_window_type override
own_window yes
update_interval 1
use_spacer none
minimum_size 1260 1004
# Lua
lua_load /stuff/programming/misc/conky/conkygraph/conkygraph.lua
lua_startup_hook load_graphs ./graphs.json
lua_draw_hook_pre draw_graphs
TEXT

162
example1/graphs.json
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{
"cpu": {
"name": "cpu usage",
"outline": true,
"outline_color": "ffffff",
"outline_antialias": false,
"outline_alpha": 1,
"outline_width": 1,
"x": 0,
"y": 0,
"width": 0,
"height": 328,
"functions": {
"cpu0": {
"name": "cpu0",
"conky_variable": "${cpu cpu1}",
"dx": 1,
"record_max": false,
"max_value": 100,
"antialias": true,
"stroke_color": "73d216",
"stroke_width": 2,
"fill": false,
"fill_color": null,
"fill_alpha": null
},
"cpu1": {
"name": "cpu1",
"conky_variable": "${cpu cpu2}",
"dx": 1,
"record_max": false,
"max_value": 100,
"antialias": true,
"stroke_color": "3465a4",
"stroke_width": 2,
"fill": false,
"fill_color": null,
"fill_alpha": null
},
"cpu2": {
"name": "cpu2",
"conky_variable": "${cpu cpu3}",
"dx": 1,
"record_max": false,
"max_value": 100,
"antialias": true,
"stroke_color": "cc0000",
"stroke_width": 2,
"fill": false,
"fill_color": null,
"fill_alpha": null
},
"cpu3": {
"name": "cpu3",
"conky_variable": "${cpu cpu4}",
"dx": 1,
"record_max": false,
"max_value": 100,
"antialias": true,
"stroke_color": "f57900",
"stroke_width": 2,
"fill": false,
"fill_color": null,
"fill_alpha": null
}
}
},
"ram_swap": {
"name": "ram and swap",
"outline": true,
"outline_color": "ffffff",
"outline_antialias": false,
"outline_alpha": 1,
"outline_width": 1,
"x": 0,
"y": 338,
"width": 0,
"height": 328,
"functions": {
"ram": {
"name": "ram",
"conky_variable": "${memperc}",
"dx": 1,
"record_max": false,
"max_value": 100,
"antialias": true,
"stroke_color": "73d216",
"stroke_width": 2,
"fill": false,
"fill_color": null,
"fill_alpha": null
},
"swap": {
"name": "swap",
"conky_variable": "${swapperc}",
"dx": 1,
"record_max": false,
"max_value": 100,
"antialias": true,
"stroke_color": "cc0000",
"stroke_width": 2,
"fill": false,
"fill_color": null,
"fill_alpha": null
}
}
},
"link_up_down": {
"name": "link quality, up and down",
"outline": true,
"outline_color": "ffffff",
"outline_antialias": false,
"outline_alpha": 1,
"outline_width": 1,
"x": 0,
"y": 676,
"width": 0,
"height": 328,
"functions": {
"link": {
"name": "link",
"conky_variable": "${wireless_link_qual wlan0}",
"dx": 1,
"record_max": false,
"max_value": 70,
"max_parse": "${wireless_link_qual_max wlan0}",
"antialias": true,
"stroke_color": "3465a4",
"stroke_width": 2,
"fill": false,
"fill_color": null,
"fill_alpha": null
},
"down": {
"name": "down",
"conky_variable": "${to_bytes ${downspeedf wlan0}}",
"dx": 1,
"record_max": true,
"max_value": 0,
"antialias": true,
"stroke_color": "75507b",
"stroke_width": 2,
"fill": false,
"fill_color": null,
"fill_alpha": null
},
"up": {
"name": "up",
"conky_variable": "${to_bytes ${upspeedf wlan0}}",
"dx": 1,
"record_max": true,
"max_value": 0,
"antialias": true,
"stroke_color": "f57900",
"stroke_width": 2,
"fill": false,
"fill_color": null,
"fill_alpha": null
}
}
}
}
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