Code:
--[[ GRAPH widget v1.1 by wlourf (07.01.2011)
this widget draws some graphs with some effects
http://u-scripts.blogspot.com/2010/10/graph-widget.html
To call the script in a conky, use, before TEXT
lua_load /path/to/the/script/graph.lua
lua_draw_hook_pre main_graph
and add one line (blank or not) after TEXT
Parameters are :
3 parameters are mandatory
name - the name of the conky variable to display,
for example for {$cpu cpu0}, just write name="cpu"
arg - the argument of the above variable,
for example for {$cpu cpu1}, just write arg="cpu1"
arg can be a numerical value if name=""
max - the maximum value the above variable can reach,
for example for {$cpu cpu1}, just write max=100 or less or more
Optional parameters:
x,y - coordinates of the bottom-left corner of the graph,
relative to the top-left corner of the conky window
default = bottom-left corner of the conky window
width - width of the graph, default = 100 pixels
height - height of the graph, default = 20 pixels
nb_values - number of values to display in the graph, default=width
i.e. 1 pixel for 1 value
autoscale - if set to true, calculate the max valeu of the y axis and
doesn't use the max parameter above, default=false
skew_x - skew graph around x axis, défaut = 0
skew_y - skew graph around y axis, défaut = 0
angle - angle of rotation of the graph in degress, default = 0
i.e. a horizontal graph)
inverse - if set to true, graph are draw from right to left, default=false
background - if set to false, background is not drawn, default=true
foreground - if set to false, foreground is not drawn, default=true
foreground = plain graph
bg_bd_size - size of the border of the background, default=0=no border
fg_bd_size - size of the border of the foreground, default=0=no border
Colours tables below are defined into braces :
{position in the gradient (0 to 1), colour in hexadecimal, alpha (0 to 1)}
example for a single colour table :
{{0,0xFFAA00,1}} position parameter doesn't matter
example for a two-colours table :
{{0,0xFFAA00,1},{1,0x00AA00,1}} or {{0.5,0xFFAA00,1},{1,0x00AA00,1}}
example for a three-colours table :
{{0,0xFFAA00,1},{0.5,0xFF0000,1},{1,0x00AA00,1}}
bg_colour - colour table for background,
default = {{0,0x000000,.5},{1,0xFFFFFF,.5}}
fg_colour - colour table for foreground,
default = {{0,0x00FFFF,1},{1,0x0000FF,1}}
bg_bd_colour- colour table for background border,
default = {{1,0xFFFFFF,1}}
fg_bd_colour- colour table for foreground border,
default = {{1,0xFFFF00,1}}
bg_orientation, bg_bd_orientation, fg_orientation, fg_bd_orientation,
- "orientation" defines the starting point of the gradient,
default="nn"
there are 8 available starting points :
"nw","nn","ne","ee","se","ss","sw","ww"
(n for north, w for west ...)
theses 8 points are the 4 corners + the 4 middles of graph
so a gradient "nn" will go from "nn" to "ss"
a gradient "nw" will go from "nw" to "se"
draw_me - if set to false, graph is not drawn (default = true)
it can be used with a conky string, if the string returns 1, the graph is drawn :
example : "${if_empty ${wireless_essid wlan0}}${else}1$endif",
v1.0 (31/10/2010) original release
v1.1 (07/01/2011) Add draw_me parameter and correct memory leaks, thanks to "Creamy Goodness"
text is parsed inside the function, not in the array of settings
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation version 3 (GPLv3)
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
-- MA 02110-1301, USA.
]]
require 'cairo'
function set_settings()
graph_settings={
{--first horizontal graph
name="downspeedf",
arg="eth0",
max=1000,
autoscale=true,
x=10,
y=100,
width=257,
height=26,
nb_values=500,
background =false,
fg_colour={ {0,0x555752,1}, {1,0xFF0000,1}},
fg_orientation="ww"
},
{--second horizontal graph
name="downspeedf",
arg="eth0",
max=1000,
autoscale=true,
x=10,
y=130,
width=257,
height=26,
nb_values=500,
background =false,
fg_colour={ {0,0x555752,1}, {1,0xFF0000,1}},
fg_orientation="ss"
},
{--first vertical graph
name="downspeedf",
arg="eth0",
max=1000,
autoscale=true,
x=300,
y=130,
width=257,
height=26,
nb_values=500,
background =false,
fg_colour={ {0,0x555752,1}, {1,0xFF0000,1}},
fg_orientation="ww",
angle=90,
},
{--second vertical graph
name="downspeedf",
arg="eth0",
max=1000,
autoscale=true,
x=360,
y=380,
width=257,
height=26,
nb_values=500,
background =false,
fg_colour={ {0,0x555752,1}, {1,0xFF0000,1}},
fg_orientation="ww",
angle=-90,
},
}
end
function check_settings(t)
--tables are check only when conky start
if t.name==nil and t.arg==nil then
print ("No input values ... use parameters 'name'" ..
" with 'arg' or only parameter 'arg' ")
return 1
end
if t.max==nil then
print ("No maximum value defined, use 'max'")
print ("for name=" .. t.name .. " with arg=" .. t.arg)
return 1
end
if t.name==nil then t.name="" end
if t.arg==nil then t.arg="" end
return 0
end
function conky_main_graph()
if conky_window == nil then return end
local w=conky_window.width
local h=conky_window.height
local cs=cairo_xlib_surface_create(conky_window.display,
conky_window.drawable, conky_window.visual, w, h)
cr=cairo_create(cs)
updates=tonumber(conky_parse('${updates}'))
--start drawing after "updates_gap" updates
--prevent segmentation error for cpu
updates_gap=5
if updates==1 then
set_settings()
flagOK=0
for i in pairs(graph_settings) do
if graph_settings[i].width==nil then graph_settings[i].width=100 end
if graph_settings[i].nb_values==nil then
graph_settings[i].nb_values= graph_settings[i].width
end
--create an empty table to store values
graph_settings[i]["values"]={}
--beginning point
graph_settings[i].beg = graph_settings[i].nb_values
--graph_settings[i].beg = 0
for j =1, graph_settings[i].nb_values do
graph_settings[i].values[j]=0
end
graph_settings[i].flag_init=true
flagOK=flagOK + check_settings(graph_settings[i])
end
end
if flagOK>0 then
--abort script if error in one of the tables
print ("ERROR : Check the graph_setting table")
return
end
--drawing process
if updates > updates_gap then
for i in pairs(graph_settings) do
if graph_settings[i].draw_me==true then graph_settings[i].draw_me = nil end
if (graph_settings[i].draw_me==nil or conky_parse(tostring(graph_settings[i].draw_me)) == "1") then
local nb_values=graph_settings[i].nb_values
graph_settings[i].automax=0
for j =1, nb_values do
if graph_settings[i].values[j+1]==nil then
graph_settings[i].values[j+1]=0
end
graph_settings[i].values[j]=graph_settings[i].values[j+1]
if j==nb_values then
--store value
if graph_settings[i].name=="" then
value=graph_settings[i].arg
else
value=tonumber(conky_parse('${' ..
graph_settings[i].name .. " " ..
graph_settings[i].arg ..'}'))
end
graph_settings[i].values[nb_values]=value
end
graph_settings[i].automax=math.max(graph_settings[i].automax,
graph_settings[i].values[j])
--should stop weird glitches at beginning when no values reported yet for upspeed or diskio
if graph_settings[i].automax == 0 then graph_settings[i].automax = 1 end
end
draw_graph(graph_settings[i])
end
end
end
cairo_destroy(cr)
cairo_surface_destroy(cs)
updates=nil
updates_gap=nil
end
function draw_graph(t)
--drawing function
local function rgb_to_r_g_b(colour)
return ((colour[2] / 0x10000) % 0x100) / 255., ((colour[2] / 0x100) % 0x100) / 255., (colour[2] % 0x100) / 255., colour[3]
end
local function linear_orientation(o,w,h)
--set gradient for bg and bg border
local p
if o=="nn" then
p={w/2,h,w/2,0}
elseif o=="ne" then
p={w,h,0,0}
elseif o=="ww" then
p={0,h/2,w,h/2}
elseif o=="se" then
p={w,0,0,h}
elseif o=="ss" then
p={w/2,0,w/2,h}
elseif o=="ee" then
p={w,h/2,0,h/2}
elseif o=="sw" then
p={0,0,w,h}
elseif o=="nw" then
p={0,h,w,0}
end
return p
end
local function linear_orientation_inv(o,w,h)
--set gradient for fg and fg border
local p
if o=="ss" then
p={w/2,h,w/2,0}
elseif o=="sw" then
p={w,h,0,0}
elseif o=="ee" then
p={0,h/2,w,h/2}
elseif o=="nw" then
p={w,0,0,h}
elseif o=="nn" then
p={w/2,0,w/2,h}
elseif o=="ww" then
p={w,h/2,0,h/2}
elseif o=="ne" then
p={0,0,w,h}
elseif o=="se" then
p={0,h,w,0}
end
return p
end
--set default values
--cancel drawing if not needed
if t.draw_me~=nil and conky_parse(tostring(t.draw_me)) ~= "1" then
return
end
if t.height==nil then t.height=20 end
--checked in previous part : width and nb_values
if t.background==nil then t.background=true end
if t.bg_bd_size==nil then t.bg_bd_size=0 end
if t.x==nil then t.x=t.bg_bd_size end
if t.y==nil then t.y=conky_window.height -t.bg_bd_size end
if t.bg_colour==nil then t.bg_colour={{0,0x000000,.5},{1,0xFFFFFF,.5}} end
if t.bg_bd_colour==nil then t.bg_bd_colour={{1,0xFFFFFF,1}} end
if t.foreground==nil then t.foreground=true end
if t.fg_colour==nil then t.fg_colour={{0,0x00FFFF,1},{1,0x0000FF,1}} end
if t.fg_bd_size==nil then t.fg_bd_size=0 end
if t.fg_bd_colour==nil then t.fg_bd_colour={{1,0xFFFF00,1}} end
if t.autoscale==nil then t.autoscale=false end
if t.inverse==nil then t.inverse=false end
if t.angle==nil then t.angle=0 end
if t.bg_bd_orientation==nil then t.bg_bd_orientation="nn" end
if t.bg_orientation==nil then t.bg_orientation="nn" end
if t.fg_bd_orientation==nil then t.fg_bd_orientation="nn" end
if t.fg_orientation==nil then t.fg_orientation="nn" end
--check colours tables
for i=1, #t.fg_colour do
if #t.fg_colour[i]~=3 then
print ("error in fg_colour table")
t.fg_colour[i]={1,0x0000FF,1}
end
end
for i=1, #t.fg_bd_colour do
if #t.fg_bd_colour[i]~=3 then
print ("error in fg_bd_colour table")
t.fg_bd_colour[i]={1,0x00FF00,1}
end
end
for i=1, #t.bg_colour do
if #t.bg_colour[i]~=3 then
print ("error in background color table")
t.bg_colour[i]={1,0xFFFFFF,0.5}
end
end
for i=1, #t.bg_bd_colour do
if #t.bg_bd_colour[i]~=3 then
print ("error in background border color table")
t.bg_bd_colour[i]={1,0xFFFFFF,1}
end
end
--calculate skew parameters if needed
if t.flag_init then
if t.skew_x == nil then
t.skew_x=0
else
t.skew_x = math.pi*t.skew_x/180
end
if t.skew_y == nil then
t.skew_y=0
else
t.skew_y = math.pi*t.skew_y/180
end
t.flag_init=false
end
cairo_set_line_cap(cr,CAIRO_LINE_CAP_ROUND)
cairo_set_line_join(cr,CAIRO_LINE_JOIN_ROUND)
local matrix0 = cairo_matrix_t:create()
tolua.takeownership(matrix0)
cairo_save(cr)
cairo_matrix_init (matrix0, 1,t.skew_y,t.skew_x,1,0,0)
cairo_transform(cr,matrix0)
local ratio=t.width/t.nb_values
cairo_translate(cr,t.x,t.y)
cairo_rotate(cr,t.angle*math.pi/180)
cairo_scale(cr,1,-1)
--background
if t.background then
local pts=linear_orientation(t.bg_orientation,t.width,t.height)
local pat = cairo_pattern_create_linear (pts[1],pts[2],pts[3],pts[4])
for i=1, #t.bg_colour do
--print ("i",i,t.colour[i][1], rgb_to_r_g_b(t.colour[i]))
cairo_pattern_add_color_stop_rgba (pat, t.bg_colour[i][1], rgb_to_r_g_b(t.bg_colour[i]))
end
cairo_set_source (cr, pat)
cairo_rectangle(cr,0,0,t.width,t.height)
cairo_fill(cr)
cairo_pattern_destroy(pat)
end
--autoscale
cairo_save(cr)
if t.autoscale then
t.max= t.automax*1.1
end
local scale_x = t.width/(t.nb_values-1)
local scale_y = t.height/t.max
--define first point of the graph
if updates-updates_gap <t.nb_values then
t.beg = t.beg - 1
--next line prevent segmentation error when conky window is redraw
--quicly when another window "fly" over it
if t.beg<0 then t.beg=0 end
else
t.beg=0
end
if t.inverse then cairo_scale(cr,-1,1)
cairo_translate(cr,-t.width,0) end
--graph foreground
if t.foreground then
local pts_fg=linear_orientation_inv(t.fg_orientation,t.width,t.height)
local pat = cairo_pattern_create_linear (pts_fg[1],pts_fg[2],pts_fg[3],pts_fg[4])
for i=1,#t.fg_colour,1 do
cairo_pattern_add_color_stop_rgba (pat, 1-t.fg_colour[i][1], rgb_to_r_g_b(t.fg_colour[i]))
end
cairo_set_source (cr, pat)
cairo_move_to(cr,t.beg*scale_x,0)
cairo_line_to(cr,t.beg*scale_x,t.values[t.beg+1]*scale_y)
for i=t.beg, t.nb_values-1 do
cairo_line_to(cr,i*scale_x,t.values[i+1]*scale_y)
end
cairo_line_to(cr,(t.nb_values-1)*scale_x,0)
cairo_close_path(cr)
cairo_fill(cr)
cairo_pattern_destroy(pat)
end
--graph_border
if t.fg_bd_size>0 then
local pts=linear_orientation_inv(t.fg_bd_orientation,t.width,t.height)
local pat = cairo_pattern_create_linear (pts[1],pts[2],pts[3],pts[4])
for i=1,#t.fg_bd_colour,1 do
cairo_pattern_add_color_stop_rgba (pat, 1-t.fg_bd_colour[i][1], rgb_to_r_g_b(t.fg_bd_colour[i]))
end
cairo_set_source (cr, pat)
cairo_move_to(cr,t.beg*scale_x,t.values[t.beg+1]*scale_y)
for i=t.beg, t.nb_values-1 do
cairo_line_to(cr,i*scale_x,t.values[i+1]*scale_y)
end
cairo_set_line_width(cr,t.fg_bd_size)
cairo_stroke(cr)
cairo_pattern_destroy(pat)
end
cairo_restore(cr)
--background border
if t.bg_bd_size>0 then
local pts=linear_orientation(t.bg_bd_orientation,t.width,t.height)
local pat = cairo_pattern_create_linear (pts[1],pts[2],pts[3],pts[4])
for i=1, #t.bg_bd_colour do
--print ("i",i,t.colour[i][1], rgb_to_r_g_b(t.colour[i]))
cairo_pattern_add_color_stop_rgba (pat, t.bg_bd_colour[i][1], rgb_to_r_g_b(t.bg_bd_colour[i]))
end
cairo_set_source (cr, pat)
cairo_rectangle(cr,0,0,t.width,t.height)
cairo_set_line_width(cr,t.bg_bd_size)
cairo_stroke(cr)
cairo_pattern_destroy(pat)
end
cairo_restore(cr)
end
Set the path to the Lua script in the conky (in the above TEXT section) and change the variables in the Lua script. This one is not very easy to set up but if you follow the instructions on my
EDIT : changing a parameter in the Lua script needs a restart of the conky, it's why I set the update interval to 0.1 second for the tests ! In a normal use, 1 second interval is OK.
Originally Posted by blandonfrank
Adv Reply
but I wrote this little script some month ago:
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