--[[
Conky Widgets by londonali1010 (2009)

This script is meant to be a "shell" to hold a suite of widgets for use in Conky.

To configure:
+ Copy the widget's code block (will be framed by --(( WIDGET NAME )) and --(( END WIDGET NAME )), with "[" instead of "(") somewhere between "require 'cairo'" and "function conky_widgets()", ensuring not to paste into another widget's code block
+ To call the widget, add the following between "cr = cairo_create(cs)" and "cairo_destroy(cr)" at the end of the script:
	NAME_OF_FUNCTION(cr, OPTIONS)
+ Replace OPTIONS with the options for your widget (should be specified in the widget's code block) 

Call this script in Conky using the following before TEXT (assuming you save this script to ~/scripts/conky_widgets.lua):
	lua_load ~/scripts/conky_widgets.lua
	lua_draw_hook_pre widgets
	
Changelog:
+ v1.1 -- Simplified calls to widgets by implementing a global drawing surface, and included imlib2 by default (03.11.2009)
+ v1.0 -- Original release (17.10.2009)
]]

require 'cairo'
require 'imlib2'

function conky_widgets()
	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)
	air_clock(cr, xc, yc, size)
	cairo_destroy(cr)
end

--[[ AIR CLOCK WIDGET ]]
--[[ Options (xc, yc, size):
	"xc" and "yc" are the x and y coordinates of the centre of the clock, in pixels, relative to the top left of the Conky window
	"size" is the total size of the widget, in pixels ]]

function air_clock(cr, xc, yc, size)
	local offset = 0
	
	shadow_width = size * 0.03
	shadow_xoffset = 0
	shadow_yoffset = size * 0.01
	
	if shadow_xoffset >= shadow_yoffset then
		offset = shadow_xoffset
	else offset = shadow_yoffset
	end
	
	local clock_r = (size - 2 * offset) / (2 * 1.25)
		
	show_seconds=true
	
	-- Grab time
	
	local hours=os.date("%I")
	local mins=os.date("%M")
	local secs=os.date("%S")
	
	secs_arc=(2*math.pi/60)*secs
	mins_arc=(2*math.pi/60)*mins
	hours_arc=(2*math.pi/12)*hours+mins_arc/12
	
	-- Drop shadow
	
	local ds_pat=cairo_pattern_create_radial(xc+shadow_xoffset,yc+shadow_yoffset,clock_r*1.25,xc+shadow_xoffset,yc+shadow_yoffset,clock_r*1.25+shadow_width)
	cairo_pattern_add_color_stop_rgba(ds_pat,0,0,0,0,0.2)
	cairo_pattern_add_color_stop_rgba(ds_pat,1,0,0,0,0)
	
	cairo_move_to(cr,0,0)
	cairo_line_to(cr,conky_window.width,0)
	cairo_line_to(cr,conky_window.width, conky_window.height)
	cairo_line_to(cr,0,conky_window.height)
	cairo_close_path(cr)
	cairo_new_sub_path(cr)
	cairo_arc(cr,xc,yc,clock_r*1.25,0,2*math.pi)
	cairo_set_source(cr,ds_pat)
	cairo_set_fill_rule(cr,CAIRO_FILL_RULE_EVEN_ODD)
	cairo_fill(cr)
	
	-- Glassy border
	
	cairo_arc(cr,xc,yc,clock_r*1.25,0,2*math.pi)
	cairo_set_source_rgba(cr,0.5,0.5,0.5,0.2)
	cairo_set_line_width(cr,1)
	cairo_stroke(cr)
	
	local border_pat=cairo_pattern_create_linear(xc,yc-clock_r*1.25,xc,yc+clock_r*1.25)
	
	cairo_pattern_add_color_stop_rgba(border_pat,0,1,1,1,0.7)
	cairo_pattern_add_color_stop_rgba(border_pat,0.3,1,1,1,0)
	cairo_pattern_add_color_stop_rgba(border_pat,0.5,1,1,1,0)
	cairo_pattern_add_color_stop_rgba(border_pat,0.7,1,1,1,0)
	cairo_pattern_add_color_stop_rgba(border_pat,1,1,1,1,0.7)
	cairo_set_source(cr,border_pat)
	cairo_arc(cr,xc,yc,clock_r*1.125,0,2*math.pi)
	cairo_close_path(cr)
	cairo_set_line_width(cr,clock_r*0.25)
	cairo_stroke(cr)
	
	-- Set clock face
	
	cairo_arc(cr,xc,yc,clock_r,0,2*math.pi)
	cairo_close_path(cr)
	
	local face_pat=cairo_pattern_create_radial(xc,yc-clock_r*0.75,0,xc,yc,clock_r)
	
	cairo_pattern_add_color_stop_rgba(face_pat,0,1,1,1,0.9)
	cairo_pattern_add_color_stop_rgba(face_pat,0.5,1,1,1,0.9)
	cairo_pattern_add_color_stop_rgba(face_pat,1,0.9,0.9,0.9,0.9)
	cairo_set_source(cr,face_pat)
	cairo_fill_preserve(cr)
	cairo_set_source_rgba(cr,0.5,0.5,0.5,0.2)
	cairo_set_line_width(cr, 1)
	cairo_stroke (cr)
	
	-- Draw hour hand
	
	xh=xc+0.7*clock_r*math.sin(hours_arc)
	yh=yc-0.7*clock_r*math.cos(hours_arc)
	cairo_move_to(cr,xc,yc)
	cairo_line_to(cr,xh,yh)
	
	cairo_set_line_cap(cr,CAIRO_LINE_CAP_ROUND)
	cairo_set_line_width(cr,5)
	cairo_set_source_rgba(cr,0,0,0,0.5)
	cairo_stroke(cr)
	
	-- Draw minute hand
	
	xm=xc+0.9*clock_r*math.sin(mins_arc)
	ym=yc-0.9*clock_r*math.cos(mins_arc)
	cairo_move_to(cr,xc,yc)
	cairo_line_to(cr,xm,ym)
	
	cairo_set_line_width(cr,3)
	cairo_stroke(cr)
	
	-- Draw seconds hand
	
	if show_seconds then
		xs=xc+0.9*clock_r*math.sin(secs_arc)
		ys=yc-0.9*clock_r*math.cos(secs_arc)
		cairo_move_to(cr,xc,yc)
		cairo_line_to(cr,xs,ys)
	
		cairo_set_line_width(cr,1)
		cairo_stroke(cr)
	end
end

--[[ END AIR CLOCK WIDGET ]]