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local gcolor = require "gears.color"
local gtable = require "gears.table"
local wibox = require "wibox"
local linegraph = { mt = {} }
function linegraph:fit(_, width, height)
if #self._private.values < 2 then
return 0, 0
end
return width, height
end
function linegraph:draw(_, cr, width, height)
if #self._private.values < 2 then
return
end
local line_width = self._private.line_width
local values = self._private.values
local max, min = self._private.max or 0, self._private.min or 0
if not (self._private.max and self._private.min) then
for _, value in ipairs(values) do
if not self._private.max then
max = max < value and value or max
end
if not self._private.min then
min = min > value and value or min
end
end
end
local usable_height = height - line_width
local min_abs = math.abs(min)
local h_factor = usable_height / (min_abs + max)
local function transform(value)
return usable_height - math.floor((value + min_abs) * h_factor) + line_width / 2
end
local graph_values = {}
for i = 1, #values, math.ceil(#values / width) do
table.insert(graph_values, transform(values[i]))
end
if self._private.draw_bg then
cr:save()
self._private.draw_bg(cr, width, height, min, max, transform)
cr:restore()
end
cr:set_line_width(line_width)
cr:set_source(gcolor(self.color))
cr:move_to(line_width / 2, graph_values[1])
for i = 2, #graph_values do
cr:line_to((width - line_width / 2) / (#graph_values - 1) * (i - 1), graph_values[i])
end
if self._private.fill then
cr:line_to(width - line_width / 2, transform(min))
cr:line_to(line_width / 2, transform(min))
cr:line_to(line_width / 2, graph_values[1])
cr:stroke_preserve()
cr:set_source(gcolor(self.fill_color))
cr:fill()
else
cr:stroke()
end
end
function linegraph:set_values(values)
self._private.values = values
self:emit_signal "widget::redraw_needed"
end
function linegraph:get_values()
return self._private.values
end
function linegraph:set_draw_bg(draw_bg)
self._private.draw_bg = draw_bg
self:emit_signal "widget::redraw_needed"
end
function linegraph:get_draw_bg()
return self._private.draw_bg
end
function linegraph:set_max(max)
self._private.max = max
self:emit_signal "widget::redraw_needed"
end
function linegraph:get_max()
return self._private.max
end
function linegraph:set_min(min)
self._private.max = min
self:emit_signal "widget::redraw_needed"
end
function linegraph:get_min()
return self._private.min
end
function linegraph:set_line_width(line_width)
self._private.line_width = line_width
self:emit_signal "widget::redraw_needed"
end
function linegraph:set_color(color)
self._private.color = color
self:emit_signal "widget::redraw_needed"
end
function linegraph:get_color()
return self._private.color
end
function linegraph:set_fill_color(fill_color)
self._private.fill_color = fill_color
self:emit_signal "widget::redraw_needed"
end
function linegraph:get_fill_color()
return self._private.fill_color
end
function linegraph:set_fill(fill)
self._private.fill = fill
self:emit_signal "widget::redraw_needed"
end
function linegraph:get_fill()
return self._private.fill
end
local function new()
local ret = wibox.widget.base.make_widget(nil, nil, { enable_properties = true })
gtable.crush(ret, linegraph, true)
ret.line_width = 1
ret.color = "#ffffff"
ret.fill_color = "#000000"
return ret
end
function linegraph.mt:__call()
return new()
end
return setmetatable(linegraph, linegraph.mt)
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