#113 power formatting on turbine energy in main overview

graphics/elements/indicators/power.lua

@@ -0,0 +1,74 @@
+-- Power Indicator Graphics Element
+
+local util    = require("scada-common.util")
+
+local element = require("graphics.element")
+
+---@class power_indicator_args
+---@field label string indicator label
+---@field format string power format override (lua string format)
+---@field lu_colors? cpair label foreground color (a), unit foreground color (b)
+---@field value any default value
+---@field parent graphics_element
+---@field id? string element id
+---@field x? integer 1 if omitted
+---@field y? integer 1 if omitted
+---@field width integer length
+---@field fg_bg? cpair foreground/background colors
+
+-- new power indicator
+---@param args power_indicator_args
+---@return graphics_element element, element_id id
+local function power(args)
+    assert(args.value ~= nil, "graphics.elements.indicators.power: value is a required field")
+    assert(util.is_int(args.width), "graphics.elements.indicators.power: width is a required field")
+
+    -- single line
+    args.height = 1
+
+    -- create new graphics element base object
+    local e = element.new(args)
+
+    -- label color
+    if args.lu_colors ~= nil then
+        e.window.setTextColor(args.lu_colors.color_a)
+    end
+
+    -- write label
+    e.window.setCursorPos(1, 1)
+    e.window.write(args.label)
+
+    local data_start = string.len(args.label) + 2
+
+    -- on state change
+    ---@param value any new value
+    function e.on_update(value)
+        e.value = value
+
+        local data_str, unit = util.power_format(value, false, args.format)
+
+        -- write data
+        e.window.setCursorPos(data_start, 1)
+        e.window.setTextColor(e.fg_bg.fgd)
+        e.window.write(util.comma_format(data_str))
+
+        -- write unit
+        if args.lu_colors ~= nil then
+            e.window.setTextColor(args.lu_colors.color_b)
+        end
+        -- add space so we don't end up with FEE (after having kFE for example)
+        if unit == "FE" then unit = "FE " end
+        e.window.write(" " .. unit)
+    end
+
+    -- set the value
+    ---@param val any new value
+    function e.set_value(val) e.on_update(val) end
+
+    -- initial value draw
+    e.on_update(args.value)
+
+    return e.get()
+end
+
+return power