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awful.widget: add graph stack property 

Initial implementation of stacked graphs. Adds two new methods,
set_stack (false by default) and set_stack_colors (i.e. {"red",
"white", "blue"}). The order of the colors matters, because the
add_value method now accepts an (optional) last argument, an index of
a color from your stack color group.

Signed-off-by: Adrian C. (anrxc) <anrxc@sysphere.org>
Signed-off-by: Julien Danjou <julien@danjou.info>
This commit is contained in:
Adrian C. (anrxc) 2010-03-25 05:24:10 +01:00 committed by Julien Danjou
parent 167770d06f
commit dc5b09d3b0
1 changed files with 106 additions and 54 deletions
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80
lib/awful/widget/graph.lua.in
View File

@ -8,6 +8,7 @@ local setmetatable = setmetatable
local ipairs = ipairs
local math = math
local table = table
local type = type
local capi = { image = image,
widget = widget }
local layout = require("awful.widget.layout")
@ -65,9 +66,21 @@ local data = setmetatable({}, { __mode = "k" })
-- @param graph The graph.
-- @param scale A boolean value
local properties = { "width", "height", "border_color",
"gradient_colors", "gradient_angle", "color",
"background_color", "max_value", "scale" }
--- Set the graph to draw stacks. Default is false.
-- @name set_stack
-- @class function
-- @param progressbar The graph.
-- @param stack A boolean value.
--- Set the graph stacking colors. Order matters.
-- @name set_stack_colors
-- @class function
-- @param graph The graph.
-- @param stack_colors A table with stacking colors.
local properties = { "width", "height", "border_color", "stack",
"stack_colors", "gradient_colors", "gradient_angle",
"color", "background_color", "max_value", "scale" }
local function update(graph)
-- Create new empty image
@ -78,6 +91,35 @@ local function update(graph)
border_width = 1
end
-- Draw a stacked graph
if data[graph].stack then
-- Draw the background first
img:draw_rectangle(border_width, border_width,
data[graph].width - (2 * border_width),
data[graph].height,
true, data[graph].background_color or "#000000aa")
for i = 0, data[graph].width - (2 * border_width) do
local rel_i = 0
local rel_x = data[graph].width - border_width - i - 1
if data[graph].stack_colors then
for idx, color in ipairs(data[graph].stack_colors) do
local values = data[graph].values[idx]
if values and i < #values then
local value = values[#values - i] + rel_i
img:draw_line(rel_x, border_width - 1 +
math.ceil((data[graph].height - 2 * border_width) * (1 - rel_i)),
rel_x, border_width - 1 +
math.ceil((data[graph].height - 2 * border_width) * (1 - value)),
color or "red")
rel_i = value
end
end
end
end
else
local values = data[graph].values
local max_value = data[graph].max_value
@ -89,7 +131,6 @@ local function update(graph)
end
end
-- Draw background
-- Draw full gradient
if data[graph].gradient_colors then
img:draw_rectangle_gradient(border_width, border_width,
@ -104,7 +145,7 @@ local function update(graph)
true, data[graph].color or "red")
end
-- No value? Draw nothing.
-- Draw the background on no value
if #values ~= 0 then
-- Draw reverse
for i = 0, #values - 1 do
@ -113,7 +154,7 @@ local function update(graph)
value = value / max_value
img:draw_line(data[graph].width - border_width - i - 1,
border_width - 1 +
math.floor(((data[graph].height - 2 * border_width) * (1 - value)) + 0.5),
math.ceil((data[graph].height - 2 * border_width) * (1 - value)),
data[graph].width - border_width - i - 1,
border_width - 1,
data[graph].background_color or "#000000aa")
@ -121,18 +162,19 @@ local function update(graph)
end
end
-- If we did not draw values everywhere, draw a square over the last left
-- part to set everything to 0 :-)
-- If we didn't draw values in full length, draw a square
-- over the last, left, part to reset everything to 0
if #values < data[graph].width - (2 * border_width) then
img:draw_rectangle(border_width, border_width,
data[graph].width - (2 * border_width) - #values,
data[graph].height - (2 * border_width),
true, data[graph].background_color or "#000000aa")
end
end
-- Draw the border last so that it overlaps other stuff
-- Draw the border last so that it overlaps already drawn values
if data[graph].border_color then
-- Draw border
-- Draw the border
img:draw_rectangle(0, 0, data[graph].width, data[graph].height,
false, data[graph].border_color or "white")
end
@ -144,24 +186,34 @@ end
--- Add a value to the graph
-- @param graph The graph.
-- @param value The value between 0 and 1.
local function add_value(graph, value)
-- @param group The stack color group index.
local function add_value(graph, value, group)
if not graph then return end
local value = value or 0
local values = data[graph].values
local max_value = data[graph].max_value
value = math.max(0, value)
if not data[graph].scale then
value = math.min(max_value, value)
end
table.insert(data[graph].values, value)
if data[graph].stack and group then
if not data[graph].values[group]
or type(data[graph].values[group]) ~= "table"
then
data[graph].values[group] = {}
end
values = data[graph].values[group]
end
table.insert(values, value)
local border_width = 0
if data[graph].border then border_width = 2 end
-- Ensure we never have more data than we can draw
while #data[graph].values > data[graph].width - border_width do
table.remove(data[graph].values, 1)
while #values > data[graph].width - border_width do
table.remove(values, 1)
end
update(graph)