node.lua

gl.setup(1024, 768)

util.init_hosted()

local json = require "json"

local departures = {}

util.file_watch("departures.json", function(content)
    departures = json.decode(content)
end)

local white = resource.create_colored_texture(1,1,1,1)

local base_time = N.base_time or 0

util.data_mapper{
    ["clock/set"] = function(time)
        base_time = tonumber(time) - sys.now()
        N.base_time = base_time
    end;
}

local function unixnow()
    return base_time + sys.now()
end

local colored = resource.create_shader[[
    uniform vec4 color;
    void main() {
        gl_FragColor = color;
    }
]]

local fadeout = 5

function node.render()
    CONFIG.background_color.clear()
    local now = unixnow()
    local y = 23
    for idx, dep in ipairs(departures) do
        if dep.date > now  - fadeout then
            if now > dep.date then
                y = y - 120 / fadeout * (now - dep.date)
            end
        end
    end
    for idx, dep in ipairs(departures) do
        if dep.date > now  - fadeout then
            local time = dep.nice_date

            local remaining = math.floor((dep.date - now) / 60)
            local append = ""

            if remaining < 0 then
                time = "In der Vergangenheit"
                if dep.next_date then
                    append = string.format("und in %d min", math.floor((dep.next_date - now)/60))
                end
            elseif remaining < 1 then
                if now % 2 < 1 then
                    time = "*jetzt"
                else
                    time = "jetzt*"
                end
                if dep.next_date then
                    append = string.format("und in %d min", math.floor((dep.next_date - now)/60))
                end
            elseif remaining < 2 then
                time = string.format("%d min", ((dep.date - now)/60))
                if dep.next_nice_date then
                    append = "und wieder " .. math.floor((dep.next_date - dep.date)/60) .. " min später"
                end
            else
                time = time -- .. " +" .. remaining
                if dep.next_nice_date then
                    append = "und wieder " .. dep.next_nice_date
                end
            end

            stop_r, stop_g, stop_b = 1,1,1

            if remaining < 5 then
                colored:use{color = {dep.color_r, dep.color_g, dep.color_b, 1}}
                white:draw(0,y, 100,y + 40)
                colored:deactivate()
                CONFIG.font:write(50 - #dep.symbol*10, y, dep.symbol, 40, 1,1,1,1)
                CONFIG.font:write(120, y, time , 45, 1,1,1,1)
                if sys.now() % 6 < 2.5 and #dep.more > 0 then
                    CONFIG.font:write(250, y, dep.more, 30, 1,1,1,1)
                else
                    CONFIG.font:write(250, y, dep.direction, 30, stop_r,stop_g,stop_b,1)
                end
                y = y + 30
                CONFIG.font:write(250, y, append , 25, 1,1,1,1)
                y = y + 40
            else
                colored:use{color = {dep.color_r, dep.color_g, dep.color_b, 1}}
                white:draw(0,y, 100,y + 40)
                colored:deactivate()
                CONFIG.font:write(50 - #dep.symbol*10, y, dep.symbol, 40, 1,1,1,1)
                CONFIG.font:write(120, y, time , 45, 1,1,1,1)
                if sys.now() % 6 < 2.5 and #dep.more > 0 then
                    CONFIG.font:write(250, y, dep.more, 30, 1,1,1,1)
                else
                    CONFIG.font:write(250, y, dep.direction, 30, stop_r,stop_g,stop_b,1)
                end
                y = y + 30
                CONFIG.font:write(250, y, append , 25, 1,1,1,1)
                y = y + 40
            end

            if y > HEIGHT - 50 then
                break
            end
        end
    end
end