280 lines
8.3 KiB
Lua
280 lines
8.3 KiB
Lua
---------------------------------------------------------------------------
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-- @author Julien Danjou <julien@danjou.info>
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-- @copyright 2009 Julien Danjou
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-- @release @AWESOME_VERSION@
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---------------------------------------------------------------------------
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local setmetatable = setmetatable
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local ipairs = ipairs
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local math = math
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local table = table
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local type = type
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local color = require("gears.color")
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local base = require("wibox.widget.base")
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--- A graph widget.
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module("awful.widget.graph")
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local data = setmetatable({}, { __mode = "k" })
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--- Set the graph border color.
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-- If the value is nil, no border will be drawn.
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-- @name set_border_color
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-- @class function
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-- @param graph The graph.
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-- @param color The border color to set.
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--- Set the graph foreground color.
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-- @name set_color
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-- @class function
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-- @param graph The graph.
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-- @param color The graph color.
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--- Set the graph background color.
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-- @name set_background_color
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-- @class function
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-- @param graph The graph.
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-- @param color The graph background color.
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--- Set the maximum value the graph should handle.
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-- If "scale" is also set, the graph never scales up below this value, but it
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-- automatically scales down to make all data fit.
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-- @name set_max_value
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-- @class function
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-- @param graph The graph.
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-- @param value The value.
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--- Set the graph to automatically scale its values. Default is false.
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-- @name set_scale
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-- @class function
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-- @param graph The graph.
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-- @param scale A boolean value
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--- Set the graph to draw stacks. Default is false.
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-- @name set_stack
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-- @class function
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-- @param progressbar The graph.
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-- @param stack A boolean value.
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--- Set the graph stacking colors. Order matters.
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-- @name set_stack_colors
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-- @class function
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-- @param graph The graph.
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-- @param stack_colors A table with stacking colors.
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local properties = { "width", "height", "border_color", "stack",
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"stack_colors", "color", "background_color",
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"max_value", "scale" }
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function draw(graph, wibox, cr, width, height)
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local max_value = data[graph].max_value
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local values = data[graph].values
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local border_width = 0
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if data[graph].border_color then
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border_width = 1
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end
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cr:set_line_width(1)
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-- Draw a stacked graph
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if data[graph].stack then
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if data[graph].scale then
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for _, v in ipairs(values) do
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for __, sv in ipairs(v) do
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if sv > max_value then
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max_value = sv
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end
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end
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end
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end
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-- Draw the background first
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cr:rectangle(border_width, border_width,
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width - (2 * border_width),
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height)
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cr:set_source(color(data[graph].background_color or "#000000aa"))
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cr:fill()
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for i = 0, width - (2 * border_width) do
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local rel_i = 0
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local rel_x = width - border_width - i - 0.5
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if data[graph].stack_colors then
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for idx, col in ipairs(data[graph].stack_colors) do
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local stack_values = values[idx]
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if stack_values and i < #stack_values then
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local value = stack_values[#stack_values - i] + rel_i
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cr:move_to(rel_x, border_width - 0.5 +
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(height - 2 * border_width) * (1 - (rel_i / max_value)))
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cr:line_to(rel_x, border_width - 0.5 +
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(height - 2 * border_width) * (1 - (value / max_value)))
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cr:set_source(color(col or "#ff0000"))
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cr:stroke()
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rel_i = value
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end
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end
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end
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end
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else
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if data[graph].scale then
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for _, v in ipairs(values) do
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if v > max_value then
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max_value = v
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end
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end
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end
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cr:rectangle(border_width, border_width,
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width - (2 * border_width),
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height - (2 * border_width))
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cr:set_source(color(data[graph].color or "#ff0000"))
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cr:fill()
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-- Draw the background on no value
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if #values ~= 0 then
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-- Draw reverse
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for i = 0, #values - 1 do
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local value = values[#values - i]
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if value >= 0 then
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value = value / max_value
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cr:move_to(width - border_width - i - 0.5,
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border_width - 0.5 +
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(height - 2 * border_width) * (1 - value))
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cr:line_to(width - border_width - i - 0.5,
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border_width - 1)
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end
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end
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cr:set_source(color(data[graph].background_color or "#000000aa"))
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cr:stroke()
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end
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-- If we didn't draw values in full length, draw a square
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-- over the last, left, part to reset everything to 0
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if #values < width - (2 * border_width) then
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cr:rectangle(border_width, border_width,
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width - (2 * border_width) - #values,
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height - (2 * border_width))
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cr:set_source(color(data[graph].background_color or "#000000aa"))
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cr:fill()
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end
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end
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-- Draw the border last so that it overlaps already drawn values
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if data[graph].border_color then
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-- Draw the border
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cr:rectangle(0.5, 0.5, width - 1, height - 1)
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cr:set_source(color(data[graph].border_color or "#ffffff"))
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cr:stroke()
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end
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end
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function fit(graph, width, height)
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return data[graph].width, data[graph].height
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end
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--- Add a value to the graph
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-- @param graph The graph.
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-- @param value The value between 0 and 1.
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-- @param group The stack color group index.
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local function add_value(graph, value, group)
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if not graph then return end
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local value = value or 0
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local values = data[graph].values
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local max_value = data[graph].max_value
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value = math.max(0, value)
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if not data[graph].scale then
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value = math.min(max_value, value)
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end
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if data[graph].stack and group then
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if not data[graph].values[group]
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or type(data[graph].values[group]) ~= "table"
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then
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data[graph].values[group] = {}
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end
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values = data[graph].values[group]
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end
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table.insert(values, value)
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local border_width = 0
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if data[graph].border then border_width = 2 end
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-- Ensure we never have more data than we can draw
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while #values > data[graph].width - border_width do
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table.remove(values, 1)
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end
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graph:emit_signal("widget::updated")
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return graph
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end
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--- Set the graph height.
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-- @param graph The graph.
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-- @param height The height to set.
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function set_height(graph, height)
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if height >= 5 then
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data[graph].height = height
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graph:emit_signal("widget::updated")
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end
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return graph
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end
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--- Set the graph width.
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-- @param graph The graph.
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-- @param width The width to set.
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function set_width(graph, width)
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if width >= 5 then
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data[graph].width = width
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graph:emit_signal("widget::updated")
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end
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return graph
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end
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-- Build properties function
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for _, prop in ipairs(properties) do
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if not _M["set_" .. prop] then
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_M["set_" .. prop] = function(graph, value)
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data[graph][prop] = value
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graph:emit_signal("widget::updated")
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return graph
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end
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end
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end
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--- Create a graph widget.
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-- @param args Standard widget() arguments. You should add width and height
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-- key to set graph geometry.
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-- @return A graph widget.
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function new(args)
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local args = args or {}
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local width = args.width or 100
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local height = args.height or 20
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if width < 5 or height < 5 then return end
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local graph = base.make_widget()
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data[graph] = { width = width, height = height, values = {}, max_value = 1 }
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-- Set methods
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graph.add_value = add_value
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graph.draw = draw
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graph.fit = fit
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for _, prop in ipairs(properties) do
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graph["set_" .. prop] = _M["set_" .. prop]
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end
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return graph
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end
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setmetatable(_M, { __call = function(_, ...) return new(...) end })
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-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
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