add linegraph widget

Signed-off-by: delta <darkussdelta@gmail.com>

1 files changed, 154 insertions, 0 deletions

diff --git a/.config/awesome/ui/statusbar/panel/widgets/linegraph.lua b/.config/awesome/ui/statusbar/panel/widgets/linegraph.lua
new file mode 100644
index 0000000..9a42632
--- /dev/null
+++ b/.config/awesome/ui/statusbar/panel/widgets/linegraph.lua
@@ -0,0 +1,154 @@
+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)