mirror of
https://github.com/MikaylaFischler/cc-mek-scada.git
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129 lines
3.6 KiB
Lua
129 lines
3.6 KiB
Lua
-- Horizontal Bar Graphics Element
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local util = require("scada-common.util")
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local element = require("graphics.element")
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---@class hbar_args
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---@field show_percent? boolean whether or not to show the percent
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---@field bar_fg_bg? cpair bar foreground/background colors if showing percent
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---@field parent graphics_element
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---@field id? string element id
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---@field x? integer 1 if omitted
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---@field y? integer auto incremented if omitted
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---@field width? integer parent width if omitted
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---@field height? integer parent height if omitted
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---@field gframe? graphics_frame frame instead of x/y/width/height
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---@field fg_bg? cpair foreground/background colors
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---@field hidden? boolean true to hide on initial draw
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-- new horizontal bar
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---@nodiscard
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---@param args hbar_args
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---@return graphics_element element, element_id id
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local function hbar(args)
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-- create new graphics element base object
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local e = element.new(args)
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e.value = 0.0
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-- bar width is width - 5 characters for " 100%" if showing percent
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local bar_width = util.trinary(args.show_percent, e.frame.w - 5, e.frame.w)
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element.assert(bar_width > 0, "too small for bar")
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local last_num_bars = -1
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-- determine bar colors
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local bar_bkg = e.fg_bg.blit_bkg
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local bar_fgd = e.fg_bg.blit_fgd
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if args.bar_fg_bg ~= nil then
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bar_bkg = args.bar_fg_bg.blit_bkg
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bar_fgd = args.bar_fg_bg.blit_fgd
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end
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-- handle data changes
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---@param fraction number 0.0 to 1.0
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function e.on_update(fraction)
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e.value = fraction
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-- enforce minimum and maximum
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if fraction < 0 then
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fraction = 0.0
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elseif fraction > 1 then
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fraction = 1.0
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end
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-- compute number of bars
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local num_bars = util.round(fraction * (bar_width * 2))
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-- redraw bar if changed
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if num_bars ~= last_num_bars then
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last_num_bars = num_bars
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local fgd = ""
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local bkg = ""
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local spaces = ""
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-- fill percentage
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for _ = 1, num_bars / 2 do
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spaces = spaces .. " "
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fgd = fgd .. bar_fgd
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bkg = bkg .. bar_bkg
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end
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-- add fractional bar if needed
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if num_bars % 2 == 1 then
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spaces = spaces .. "\x95"
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fgd = fgd .. bar_bkg
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bkg = bkg .. bar_fgd
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end
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-- pad background
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for _ = 1, ((bar_width * 2) - num_bars) / 2 do
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spaces = spaces .. " "
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fgd = fgd .. bar_bkg
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bkg = bkg .. bar_bkg
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end
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-- draw bar
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for y = 1, e.frame.h do
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e.w_set_cur(1, y)
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-- intentionally swapped fgd/bkg since we use spaces as fill, but they are the opposite
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e.w_blit(spaces, bkg, fgd)
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end
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end
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-- update percentage
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if args.show_percent then
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e.w_set_cur(bar_width + 2, math.max(1, math.ceil(e.frame.h / 2)))
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e.w_write(util.sprintf("%3.0f%%", fraction * 100))
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end
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end
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-- change bar color
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---@param bar_fg_bg cpair new bar colors
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function e.recolor(bar_fg_bg)
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bar_bkg = bar_fg_bg.blit_bkg
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bar_fgd = bar_fg_bg.blit_fgd
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e.redraw()
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end
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-- set the percentage value
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---@param val number 0.0 to 1.0
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function e.set_value(val) e.on_update(val) end
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-- element redraw
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function e.redraw()
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last_num_bars = -1
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e.on_update(e.value)
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end
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-- initial draw
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e.redraw()
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return e.complete()
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end
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return hbar
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