Lua Cario bindings
From Conky
As of version 1.7.2, Conky includes bindings for Cairo and Imlib2. This will allow to use the whole Cairo and Imlib2 APIs within Conky.
[edit] Example
The following code snippet (inspired by http://cairographics.org/samples/) will show the concept. Save the following lua code into your home directory (lets call it cairo.lua):
-- Conky Lua scripting example
--
require 'cairo'
function conky_round_rect(cr, x0, y0, w, h, r)
if (w == 0) or (h == 0) then return end
local x1 = x0 + w
local y1 = y0 + h
if w/2 < r then
if h/2 < r then
cairo_move_to (cr, x0, (y0 + y1)/2)
cairo_curve_to (cr, x0 ,y0, x0, y0, (x0 + x1)/2, y0)
cairo_curve_to (cr, x1, y0, x1, y0, x1, (y0 + y1)/2)
cairo_curve_to (cr, x1, y1, x1, y1, (x1 + x0)/2, y1)
cairo_curve_to (cr, x0, y1, x0, y1, x0, (y0 + y1)/2)
else
cairo_move_to (cr, x0, y0 + r)
cairo_curve_to (cr, x0 ,y0, x0, y0, (x0 + x1)/2, y0)
cairo_curve_to (cr, x1, y0, x1, y0, x1, y0 + r)
cairo_line_to (cr, x1 , y1 - r)
cairo_curve_to (cr, x1, y1, x1, y1, (x1 + x0)/2, y1)
cairo_curve_to (cr, x0, y1, x0, y1, x0, y1- r)
end
else
if h/2 < r then
cairo_move_to (cr, x0, (y0 + y1)/2)
cairo_curve_to (cr, x0 , y0, x0 , y0, x0 + r, y0)
cairo_line_to (cr, x1 - r, y0)
cairo_curve_to (cr, x1, y0, x1, y0, x1, (y0 + y1)/2)
cairo_curve_to (cr, x1, y1, x1, y1, x1 - r, y1)
cairo_line_to (cr, x0 + r, y1)
cairo_curve_to (cr, x0, y1, x0, y1, x0, (y0 + y1)/2)
else
cairo_move_to (cr, x0, y0 + r)
cairo_curve_to (cr, x0 , y0, x0 , y0, x0 + r, y0)
cairo_line_to (cr, x1 - r, y0)
cairo_curve_to (cr, x1, y0, x1, y0, x1, y0 + r)
cairo_line_to (cr, x1 , y1 - r)
cairo_curve_to (cr, x1, y1, x1, y1, x1 - r, y1)
cairo_line_to (cr, x0 + r, y1)
cairo_curve_to (cr, x0, y1, x0, y1, x0, y1- r)
end
end
cairo_close_path (cr)
end
cs, cr = nil -- initialize our cairo surface and context to nil
function conky_cairo_test()
if conky_window == nil then return end
if cs == nil or cairo_xlib_surface_get_width(cs) ~= conky_window.width or cairo_xlib_surface_get_height(cs) ~= conky_window.height then
if cs then cairo_surface_destroy(cs) end
cs = cairo_xlib_surface_create(conky_window.display, conky_window.drawable, conky_window.visual, conky_window.width, conky_window.height)
end
if cr then cairo_destroy(cr) end
cr = cairo_create(cs)
conky_round_rect(cr, 0.7825*w, 0.0675*h, 0.1*w, 0.1*h, 0.04*w)
local pat = cairo_pattern_create_linear (0.0, 0.065*h,
0.0, 0.165*h)
cairo_pattern_add_color_stop_rgba (pat, 0, 0, 0, 0, 1.0)
cairo_pattern_add_color_stop_rgba (pat, 1, 0.6, 0.6, 0.6, 0.5)
cairo_set_source (cr, pat)
cairo_fill_preserve (cr)
cairo_pattern_destroy (pat)
cairo_set_source_rgba (cr, 0.5, 0, 0, 0.5)
cairo_set_line_width (cr, 10.0)
cairo_stroke (cr)
cairo_destroy(cr)
cr = nil
end
function conky_cairo_cleanup()
cairo_surface_destroy(cs)
cs = nil
end
Now save the following code into a .conkyrc.cairo file, again into your home directory:
lua_load ~/cairo.lua
lua_draw_hook_pre cairo_test
TEXT
${color orange}SYSTEM ${hr 2}$color
$nodename $sysname $kernel on $machine
${alignc}${color red}${time %a %d %b}
${alignc}${time %H:%M}
Fire up conky with:
conky -d -f "Radio Space" -c .conkyrc.cairo
and you should see this on your desktop:
