#63 new indicators and fixed up old ones

graphics/elements/indicator_state.lua

@@ -0,0 +1,72 @@
+-- State (Text) Indicator Graphics Element
+
+local util    = require("scada-common.util")
+
+local element = require("graphics.element")
+
+---@class state_text_color
+---@field color cpair
+---@field text string
+
+---@class state_indicator_args
+---@field states table state color and text table
+---@field default? integer default state, defaults to 1
+---@field min_width? integer max state text length if omitted
+---@field parent graphics_element
+---@field x? integer 1 if omitted
+---@field y? integer 1 if omitted
+---@field height? integer 1 if omitted, must be an odd number
+---@field fg_bg cpair foreground/background colors
+
+-- new state indicator
+---@param args state_indicator_args
+local function state_indicator(args)
+    -- determine height
+    if util.is_int(args.height) then
+        assert(args.height % 2 == 1, "graphics.elements.indicator_state: height should be an odd number")
+    else
+        args.height = 1
+    end
+
+    -- initial guess at width
+    args.width = args.min_width or 1
+
+    -- state blit strings
+    local state_blit_cmds = {}
+    for i = 1, #args.states do
+        local state_def = args.states[i]    ---@type state_text_color
+
+        -- re-determine width
+        if string.len(state_def.text) > args.width then
+            args.width = string.len(state_def.text)
+        end
+
+        local len = string.len(state_def.text)
+        local lpad = math.floor((args.width - len) / 2)
+        local rpad = len - lpad
+
+        table.insert(state_blit_cmds, {
+            text = util.spaces(lpad) .. state_def.text .. util.spaces(rpad),
+            fgd = util.strrep(state_def.color.blit_fgd, 3),
+            bkg = util.strrep(state_def.color.blit_bkg, 3)
+        })
+    end
+
+    -- create new graphics element base object
+    local e = element.new(args)
+
+    -- on state change
+    ---@param new_state integer indicator state
+    function e.on_update(new_state)
+        local blit_cmd = state_blit_cmds[new_state]
+        e.window.setCursorPos(1, 1)
+        e.window.blit(blit_cmd.text, blit_cmd.fgd, blit_cmd.bkg)
+    end
+
+    -- initial draw
+    e.on_update(args.default or 1)
+
+    return e.get()
+end
+
+return state_indicator