--[[
Clock Rings by Linux Mint (2011) reEdited by despot77

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)
   v1.1p -- Jpope edit londonali1010 (05.10.2009)
*v Mint-lua -- reEdit despot77 (18.02.2011)
]]

--[[

Update: fehlix@mxlinux.org , May, 2020

	to use the default color value set below with colorN
	use the same name 'colorN' as defined with conky.config table in conkyrc

]]

color_table = {

	color0 = 0xFFFFFF,  -- FFFFFF
	color1 = 0xFE0055,  -- FE0055 
	color2 = 0xFF0055,  -- FF0055

}


settings_table = {
    
    {
        name='cpu',
        arg='cpu0',
        max=100,
        bg_colour=color_table.color0,
        bg_alpha=0.2,
        fg_colour=color_table.color2,
        fg_alpha=0.8,
        x=145, y=270,
        radius=25,
        thickness=25,
        start_angle=-90,
        end_angle=180
    },
    {
        name='memperc',
        arg='',
        max=100,
        bg_colour=color_table.color0,
        bg_alpha=0.2,
        fg_colour=color_table.color2,
        fg_alpha=0.8,
        x=145, y=355,
        radius=25,
        thickness=25,
        start_angle=-90,
        end_angle=180
    },
    {
        name='fs_used_perc',
        arg='/',
        max=100,
        bg_colour=color_table.color0,
        bg_alpha=0.2,
        fg_colour=color_table.color2,
        fg_alpha=0.8,
        x=145, y=440,
        radius=25,
        thickness=25,
        start_angle=-90,
        end_angle=180
    },
    {
        name='fs_used_perc',
        arg='/home',
        max=100,
        bg_colour=color_table.color0,
        bg_alpha=0.2,
        fg_colour=color_table.color2,
        fg_alpha=0.8,
        x=145, y=525,
        radius=25,
        thickness=25,
        start_angle=-90,
        end_angle=180
    },
        {
        name='downspeedf',
        arg='wlan0',
        max=210,
        bg_colour=color_table.color0,
        bg_alpha=0.2,
        fg_colour=color_table.color2,
        fg_alpha=0.8,
        x=145, y=610,
        radius=30,
        thickness=12,
        start_angle=-90,
        end_angle=180
    },
        {
        name='upspeedf',
        arg='wlan0',
        max=100,
        bg_colour=color_table.color0,
        bg_alpha=0.2,
        fg_colour=color_table.color2,
        fg_alpha=0.8,
        x=145, y=610,
        radius=16,
        thickness=12,
        start_angle=-90,
        end_angle=180
    },
}

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

clock_r=65

-- "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=100
clock_y=150

show_seconds=true

require 'cairo'
pcall(function() require('cairo_xlib') end)

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
         
end

function conky_clock_rings()
    local function setup_rings(cr,pt)
        local str=''
        local value=0
        local arg=pt['arg']
        
        if  pt['name'] == 'upspeedf' or pt['name'] == 'downspeedf' then
			if     tonumber(conky_parse('${if_up   eth0}1${else}0${endif}')) == 1 then arg='eth0' 
			elseif tonumber(conky_parse('${if_up   eth1}1${else}0${endif}')) == 1 then arg='eth1'
			elseif tonumber(conky_parse('${if_up  wlan0}1${else}0${endif}')) == 1 then arg='wlan0'
			else   arg='wlan1'
			end
		end
        str=string.format('${%s %s}',pt['name'], 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
    
    draw_clock_hands(cr,clock_x,clock_y)
end
