Code:
--[[
BARGRAPH WIDGET
v2.1 by wlourf (07 Jan. 2011)
this widget draws a bargraph with different effects
http://u-scripts.blogspot.com/2010/07/bargraph-widget.html
To call the script in a conky, use, before TEXT
lua_load /path/to/the/script/bargraph.lua
lua_draw_hook_pre main_rings
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 cpu0}, just write arg="cpu0"
arg can be a numerical value if name=""
max - the maximum value the above variable can reach, for example, for {$cpu cpu0}, just write max=100
Optional parameters:
x,y - coordinates of the starting point of the bar, default = middle of the conky window
cap - end of cap line, ossibles values are r,b,s (for round, butt, square), default="b"
http://www.cairographics.org/samples/set_line_cap/
angle - angle of rotation of the bar in degress, default = 0 (i.e. a vertical bar)
set to 90 for an horizontal bar
skew_x - skew bar around x axis, default = 0
skew_y - skew bar around y axis, default = 0
blocks - number of blocks to display for a bar (values >0) , default= 10
height - height of a block, default=10 pixels
width - width of a block, default=20 pixels
space - space between 2 blocks, default=2 pixels
angle_bar - this angle is used to draw a bar on a circular way (ok, this is no more a bar !) default=0
radius - for cicular bars, internal radius, default=0
with radius, parameter width has no more effect.
Colours below are defined into braces {colour in hexadecimal, alpha}
fg_colour - colour of a block ON, default= {0x00FF00,1}
bg_colour - colour of a block OFF, default = {0x00FF00,0.5}
alarm - threshold, values after this threshold will use alarm_colour colour , default=max
alarm_colour - colour of a block greater than alarm, default=fg_colour
smooth - (true or false), create a gradient from fg_colour to bg_colour, default=false
mid_colour - colours to add to gradient, with this syntax {position into the gradient (0 to1), colour hexa, alpha}
for example, this table {{0.25,0xff0000,1},{0.5,0x00ff00,1},{0.75,0x0000ff,1}} will add
3 colours to gradient created by fg_colour and alarm_colour, default=no mid_colour
led_effect - add LED effects to each block, default=no led_effect
if smooth=true, led_effect is not used
possibles values : "r","a","e" for radial, parallel, perdendicular to the bar (just try!)
led_effect has to be used with theses colours :
fg_led - middle colour of a block ON, default = fg_colour
bg_led - middle colour of a block OFF, default = bg_colour
alarm_led - middle colour of a block > ALARM, default = alarm_colour
reflection parameters, not available for circular bars
reflection_alpha - add a reflection effect (values from 0 to 1) default = 0 = no reflection
other values = starting opacity
reflection_scale - scale of the reflection (default = 1 = height of text)
reflection_length - length of reflection, define where the opacity will be set to zero
values from 0 to 1, default =1
reflection - position of reflection, relative to a vertical bar, default="b"
possibles values are : "b","t","l","r" for bottom, top, left, right
draw_me - if set to false, text is not drawn (default = true or 1)
it can be used with a conky string, if the string returns 1, the text is drawn :
example : "${if_empty ${wireless_essid wlan0}}${else}1$endif",
v1.0 (10 Feb. 2010) original release
v1.1 (13 Feb. 2010) numeric values can be passed instead conky stats with parameters name="", arg = numeric_value
v1.2 (28 Feb. 2010) just renamed the widget to bargraph
v1.3 (03 Mar. 2010) added parameters radius & angle_bar to draw the bar in a circular way
v2.0 (12 Jul. 2010) rewrite script + add reflection effects and parameters are now set into tables
v2.1 (07 Jan. 2011) Add draw_me parameter and correct memory leaks, thanks to "Creamy Goodness"
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation version 3 (GPLv3)
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
-- MA 02110-1301, USA.
]]
require 'cairo'
----------------START OF PARAMETERS ----------
function conky_main_bars()
local bars_settings={
{ --[ Graph for CPU1 ]--
name="cpu",
arg="cpu0",
max=100,
alarm=80,
alarm_colour={0xFF0000,0.72},
bg_colour={0x2F4F4F,0.0},
fg_colour={0x00FF00,0.55},
mid_colour={{0.45,0xFFFF00,0.70}},
x=30,y=30,
blocks=56,
space=1,
height=2,width=5,
angle=90,
smooth=true
}
}
-----------END OF PARAMETERS--------------
if conky_window == nil then return end
local cs = cairo_xlib_surface_create(conky_window.display, conky_window.drawable, conky_window.visual, conky_window.width, conky_window.height)
cr = cairo_create(cs)
--prevent segmentation error when reading cpu state
if tonumber(conky_parse('${updates}'))>3 then
for i in pairs(bars_settings) do
draw_multi_bar_graph(bars_settings[i])
end
end
cairo_destroy(cr)
cairo_surface_destroy(cs)
cr=nil
end
function draw_multi_bar_graph(t)
cairo_save(cr)
--check values
if t.draw_me == true then t.draw_me = nil end
if t.draw_me ~= nil and conky_parse(tostring(t.draw_me)) ~= "1" then return end
if t.name==nil and t.arg==nil then
print ("No input values ... use parameters 'name' with 'arg' or only parameter 'arg' ")
return
end
if t.max==nil then
print ("No maximum value defined, use 'max'")
return
end
if t.name==nil then t.name="" end
if t.arg==nil then t.arg="" end
--set default values
if t.x == nil then t.x = conky_window.width/2 end
if t.y == nil then t.y = conky_window.height/2 end
if t.blocks == nil then t.blocks=10 end
if t.height == nil then t.height=10 end
if t.angle == nil then t.angle=0 end
t.angle = t.angle*math.pi/180
--line cap style
if t.cap==nil then t.cap = "b" end
local cap="b"
for i,v in ipairs({"s","r","b"}) do
if v==t.cap then cap=v end
end
local delta=0
if t.cap=="r" or t.cap=="s" then delta = t.height end
if cap=="s" then cap = CAIRO_LINE_CAP_SQUARE
elseif cap=="r" then
cap = CAIRO_LINE_CAP_ROUND
elseif cap=="b" then
cap = CAIRO_LINE_CAP_BUTT
end
--end line cap style
--if t.led_effect == nil then t.led_effect="r" end
if t.width == nil then t.width=20 end
if t.space == nil then t.space=2 end
if t.radius == nil then t.radius=0 end
if t.angle_bar == nil then t.angle_bar=0 end
t.angle_bar = t.angle_bar*math.pi/360 --halt angle
--colours
if t.bg_colour == nil then t.bg_colour = {0x00FF00,0.5} end
if #t.bg_colour~=2 then t.bg_colour = {0x00FF00,0.5} end
if t.fg_colour == nil then t.fg_colour = {0x00FF00,1} end
if #t.fg_colour~=2 then t.fg_colour = {0x00FF00,1} end
if t.alarm_colour == nil then t.alarm_colour = t.fg_colour end
if #t.alarm_colour~=2 then t.alarm_colour = t.fg_colour end
if t.mid_colour ~= nil then
for i=1, #t.mid_colour do
if #t.mid_colour[i]~=3 then
print ("error in mid_color table")
t.mid_colour[i]={1,0xFFFFFF,1}
end
end
end
if t.bg_led ~= nil and #t.bg_led~=2 then t.bg_led = t.bg_colour end
if t.fg_led ~= nil and #t.fg_led~=2 then t.fg_led = t.fg_colour end
if t.alarm_led~= nil and #t.alarm_led~=2 then t.alarm_led = t.fg_led end
if t.led_effect~=nil then
if t.bg_led == nil then t.bg_led = t.bg_colour end
if t.fg_led == nil then t.fg_led = t.fg_colour end
if t.alarm_led == nil then t.alarm_led = t.fg_led end
end
if t.alarm==nil then t.alarm = t.max end --0.8*t.max end
if t.smooth == nil then t.smooth = false end
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
if t.reflection_alpha==nil then t.reflection_alpha=0 end
if t.reflection_length==nil then t.reflection_length=1 end
if t.reflection_scale==nil then t.reflection_scale=1 end
--end of default values
local function rgb_to_r_g_b(col_a)
return ((col_a[1] / 0x10000) % 0x100) / 255., ((col_a[1] / 0x100) % 0x100) / 255., (col_a[1] % 0x100) / 255., col_a[2]
end
--functions used to create patterns
local function create_smooth_linear_gradient(x0,y0,x1,y1)
local pat = cairo_pattern_create_linear (x0,y0,x1,y1)
cairo_pattern_add_color_stop_rgba (pat, 0, rgb_to_r_g_b(t.fg_colour))
cairo_pattern_add_color_stop_rgba (pat, 1, rgb_to_r_g_b(t.alarm_colour))
if t.mid_colour ~=nil then
for i=1, #t.mid_colour do
cairo_pattern_add_color_stop_rgba (pat, t.mid_colour[i][1], rgb_to_r_g_b({t.mid_colour[i][2],t.mid_colour[i][3]}))
end
end
return pat
end
local function create_smooth_radial_gradient(x0,y0,r0,x1,y1,r1)
local pat = cairo_pattern_create_radial (x0,y0,r0,x1,y1,r1)
cairo_pattern_add_color_stop_rgba (pat, 0, rgb_to_r_g_b(t.fg_colour))
cairo_pattern_add_color_stop_rgba (pat, 1, rgb_to_r_g_b(t.alarm_colour))
if t.mid_colour ~=nil then
for i=1, #t.mid_colour do
cairo_pattern_add_color_stop_rgba (pat, t.mid_colour[i][1], rgb_to_r_g_b({t.mid_colour[i][2],t.mid_colour[i][3]}))
end
end
return pat
end
local function create_led_linear_gradient(x0,y0,x1,y1,col_alp,col_led)
local pat = cairo_pattern_create_linear (x0,y0,x1,y1) ---delta, 0,delta+ t.width,0)
cairo_pattern_add_color_stop_rgba (pat, 0.0, rgb_to_r_g_b(col_alp))
cairo_pattern_add_color_stop_rgba (pat, 0.5, rgb_to_r_g_b(col_led))
cairo_pattern_add_color_stop_rgba (pat, 1.0, rgb_to_r_g_b(col_alp))
return pat
end
local function create_led_radial_gradient(x0,y0,r0,x1,y1,r1,col_alp,col_led,mode)
local pat = cairo_pattern_create_radial (x0,y0,r0,x1,y1,r1)
if mode==3 then
cairo_pattern_add_color_stop_rgba (pat, 0, rgb_to_r_g_b(col_alp))
cairo_pattern_add_color_stop_rgba (pat, 0.5, rgb_to_r_g_b(col_led))
cairo_pattern_add_color_stop_rgba (pat, 1, rgb_to_r_g_b(col_alp))
else
cairo_pattern_add_color_stop_rgba (pat, 0, rgb_to_r_g_b(col_led))
cairo_pattern_add_color_stop_rgba (pat, 1, rgb_to_r_g_b(col_alp))
end
return pat
end
local function draw_single_bar()
--this fucntion is used for bars with a single block (blocks=1) but
--the drawing is cut in 3 blocks : value/alarm/background
--not zvzimzblr for circular bar
local function create_pattern(col_alp,col_led,bg)
local pat
if not t.smooth then
if t.led_effect=="e" then
pat = create_led_linear_gradient (-delta, 0,delta+ t.width,0,col_alp,col_led)
elseif t.led_effect=="a" then
pat = create_led_linear_gradient (t.width/2, 0,t.width/2,-t.height,col_alp,col_led)
elseif t.led_effect=="r" then
pat = create_led_radial_gradient (t.width/2, -t.height/2, 0, t.width/2,-t.height/2,t.height/1.5,col_alp,col_led,2)
else
pat = cairo_pattern_create_rgba (rgb_to_r_g_b(col_alp))
end
else
if bg then
pat = cairo_pattern_create_rgba (rgb_to_r_g_b(t.bg_colour))
else
pat = create_smooth_linear_gradient(t.width/2, 0, t.width/2,-t.height)
end
end
return pat
end
local y1=-t.height*pct/100
local y2,y3
if pct>(100*t.alarm/t.max) then
y1 = -t.height*t.alarm/100
y2 = -t.height*pct/100
if t.smooth then y1=y2 end
end
if t.angle_bar==0 then
--block for fg value
local pat = create_pattern(t.fg_colour,t.fg_led,false)
cairo_set_source(cr,pat)
cairo_rectangle(cr,0,0,t.width,y1)
cairo_fill(cr)
cairo_pattern_destroy(pat)
-- block for alarm value
if not t.smooth and y2 ~=nil then
pat = create_pattern(t.alarm_colour,t.alarm_led,false)
cairo_set_source(cr,pat)
cairo_rectangle(cr,0,y1,t.width,y2-y1)
cairo_fill(cr)
y3=y2
cairo_pattern_destroy(pat)
else
y2,y3=y1,y1
end
-- block for bg value
cairo_rectangle(cr,0,y2,t.width,-t.height-y3)
pat = create_pattern(t.bg_colour,t.bg_led,true)
cairo_set_source(cr,pat)
cairo_pattern_destroy(pat)
cairo_fill(cr)
end
end --end single bar
local function draw_multi_bar()
--function used for bars with 2 or more blocks
for pt = 1,t.blocks do
--set block y
local y1 = -(pt-1)*(t.height+t.space)
local light_on=false
--set colors
local col_alp = t.bg_colour
local col_led = t.bg_led
if pct>=(100/t.blocks) or pct>0 then --ligth on or not the block
if pct>=(pcb*(pt-1)) then
light_on = true
col_alp = t.fg_colour
col_led = t.fg_led
if pct>=(100*t.alarm/t.max) and (pcb*pt)>(100*t.alarm/t.max) then
col_alp = t.alarm_colour
col_led = t.alarm_led
end
end
end
--set colors
--have to try to create gradients outside the loop ?
local pat
if not t.smooth then
if t.angle_bar==0 then
if t.led_effect=="e" then
pat = create_led_linear_gradient (-delta, 0,delta+ t.width,0,col_alp,col_led)
elseif t.led_effect=="a" then
pat = create_led_linear_gradient (t.width/2, -t.height/2+y1,t.width/2,0+t.height/2+y1,col_alp,col_led)
elseif t.led_effect=="r" then
pat = create_led_radial_gradient (t.width/2, y1, 0, t.width/2,y1,t.width/1.5,col_alp,col_led,2)
else
pat = cairo_pattern_create_rgba (rgb_to_r_g_b(col_alp))
end
else
if t.led_effect=="a" then
pat = create_led_radial_gradient (0, 0, t.radius+(t.height+t.space)*(pt-1),
0, 0, t.radius+(t.height+t.space)*(pt),
col_alp,col_led,3)
else
pat = cairo_pattern_create_rgba (rgb_to_r_g_b(col_alp))
end
end
else
if light_on then
if t.angle_bar==0 then
pat = create_smooth_linear_gradient(t.width/2, t.height/2, t.width/2,-(t.blocks-0.5)*(t.height+t.space))
else
pat = create_smooth_radial_gradient(0, 0, (t.height+t.space), 0,0,(t.blocks+1)*(t.height+t.space),2)
end
else
pat = cairo_pattern_create_rgba (rgb_to_r_g_b(t.bg_colour))
end
end
cairo_set_source (cr, pat)
cairo_pattern_destroy(pat)
--draw a block
if t.angle_bar==0 then
cairo_move_to(cr,0,y1)
cairo_line_to(cr,t.width,y1)
else
cairo_arc( cr,0,0,
t.radius+(t.height+t.space)*(pt)-t.height/2,
-t.angle_bar -math.pi/2 ,
t.angle_bar -math.pi/2)
end
cairo_stroke(cr)
end
end
local function setup_bar_graph()
--function used to retrieve the value to display and to set the cairo structure
if t.blocks ~=1 then t.y=t.y-t.height/2 end
local value = 0
if t.name ~="" then
value = tonumber(conky_parse(string.format('${%s %s}', t.name, t.arg)))
--$to_bytes doesn't work when value has a decimal point,
--https://garage.maemo.org/plugins/ggit/browse.php/?p=monky;a=commitdiff;h=174c256c81a027a2ea406f5f37dc036fac0a524b;hp=d75e2db5ed3fc788fb8514121f67316ac3e5f29f
--http://sourceforge.net/tracker/index.php?func=detail&aid=3000865&group_id=143975&atid=757310
--conky bug?
--value = (conky_parse(string.format('${%s %s}', t.name, t.arg)))
--if string.match(value,"%w") then
-- value = conky_parse(string.format('${to_bytes %s}',value))
--end
else
value = tonumber(t.arg)
end
if value==nil then value =0 end
pct = 100*value/t.max
pcb = 100/t.blocks
cairo_set_line_width (cr, t.height)
cairo_set_line_cap (cr, cap)
cairo_translate(cr,t.x,t.y)
cairo_rotate(cr,t.angle)
local matrix0 = cairo_matrix_t:create()
tolua.takeownership(matrix0)
cairo_matrix_init (matrix0, 1,t.skew_y,t.skew_x,1,0,0)
cairo_transform(cr,matrix0)
--call the drawing function for blocks
if t.blocks==1 and t.angle_bar==0 then
draw_single_bar()
if t.reflection=="t" or t.reflection=="b" then cairo_translate(cr,0,-t.height) end
else
draw_multi_bar()
end
--dot for reminder
--[[
if t.blocks ~=1 then
cairo_set_source_rgba(cr,1,0,0,1)
cairo_arc(cr,0,t.height/2,3,0,2*math.pi)
cairo_fill(cr)
else
cairo_set_source_rgba(cr,1,0,0,1)
cairo_arc(cr,0,0,3,0,2*math.pi)
cairo_fill(cr)
end]]
--call the drawing function for reflection and prepare the mask used
if t.reflection_alpha>0 and t.angle_bar==0 then
local pat2
local matrix1 = cairo_matrix_t:create()
tolua.takeownership(matrix1)
if t.angle_bar==0 then
pts={-delta/2,(t.height+t.space)/2,t.width+delta,-(t.height+t.space)*(t.blocks)}
if t.reflection=="t" then
cairo_matrix_init (matrix1,1,0,0,-t.reflection_scale,0,-(t.height+t.space)*(t.blocks-0.5)*2*(t.reflection_scale+1)/2)
pat2 = cairo_pattern_create_linear (t.width/2,-(t.height+t.space)*(t.blocks),t.width/2,(t.height+t.space)/2)
elseif t.reflection=="r" then
cairo_matrix_init (matrix1,-t.reflection_scale,0,0,1,delta+2*t.width,0)
pat2 = cairo_pattern_create_linear (delta/2+t.width,0,-delta/2,0)
elseif t.reflection=="l" then
cairo_matrix_init (matrix1,-t.reflection_scale,0,0,1,-delta,0)
pat2 = cairo_pattern_create_linear (-delta/2,0,delta/2+t.width,-0)
else --bottom
cairo_matrix_init (matrix1,1,0,0,-1*t.reflection_scale,0,(t.height+t.space)*(t.reflection_scale+1)/2)
pat2 = cairo_pattern_create_linear (t.width/2,(t.height+t.space)/2,t.width/2,-(t.height+t.space)*(t.blocks))
end
end
cairo_transform(cr,matrix1)
if t.blocks==1 and t.angle_bar==0 then
draw_single_bar()
cairo_translate(cr,0,-t.height/2)
else
draw_multi_bar()
end
cairo_set_line_width(cr,0.01)
cairo_pattern_add_color_stop_rgba (pat2, 0,0,0,0,1-t.reflection_alpha)
cairo_pattern_add_color_stop_rgba (pat2, t.reflection_length,0,0,0,1)
if t.angle_bar==0 then
cairo_rectangle(cr,pts[1],pts[2],pts[3],pts[4])
end
cairo_clip_preserve(cr)
cairo_set_operator(cr,CAIRO_OPERATOR_CLEAR)
cairo_stroke(cr)
cairo_mask(cr,pat2)
cairo_pattern_destroy(pat2)
cairo_set_operator(cr,CAIRO_OPERATOR_OVER)
end --reflection
pct,pcb=nil
end --setup_bar_graph()
--start here !
setup_bar_graph()
cairo_restore(cr)
end
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Originally Posted by stinkeye
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