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https://github.com/MikaylaFischler/cc-mek-scada.git
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108 lines
2.8 KiB
Lua
108 lines
2.8 KiB
Lua
-- Vertical 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 vbar_args
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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 vertical bar
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---@nodiscard
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---@param args vbar_args
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---@return graphics_element element, element_id id
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local function vbar(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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local last_num_bars = -1
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local fgd = string.rep(e.fg_bg.blit_fgd, e.frame.w)
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local bkg = string.rep(e.fg_bg.blit_bkg, e.frame.w)
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local spaces = util.spaces(e.frame.w)
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local one_third = string.rep("\x8f", e.frame.w)
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local two_thirds = string.rep("\x83", e.frame.w)
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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 * (e.frame.h * 3))
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-- redraw only if number of bars has 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 y = e.frame.h
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e.w_set_cur(1, y)
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-- fill percentage
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for _ = 1, num_bars / 3 do
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e.w_blit(spaces, bkg, fgd)
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y = y - 1
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e.w_set_cur(1, y)
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end
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-- add fractional bar if needed
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if num_bars % 3 == 1 then
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e.w_blit(one_third, bkg, fgd)
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y = y - 1
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elseif num_bars % 3 == 2 then
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e.w_blit(two_thirds, bkg, fgd)
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y = y - 1
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end
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-- fill the rest blank
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while y > 0 do
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e.w_set_cur(1, y)
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e.w_blit(spaces, fgd, bkg)
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y = y - 1
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end
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end
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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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-- change bar color
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---@param fg_bg cpair new bar colors
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function e.recolor(fg_bg)
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fgd = string.rep(fg_bg.blit_fgd, e.frame.w)
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bkg = string.rep(fg_bg.blit_bkg, e.frame.w)
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e.redraw()
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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 vbar
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