A plugin that adds snow to the screen.

<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE muclient>
<muclient>
<plugin
   name="Snow"
   author="Fiendish"
   id="7b3ec26a0b1a9c9b1798adc2"
   language="Lua"
   purpose="Makes snow"
   date_written="2021-12-25 10:30:00"
   requires="5.06"
   version="1.0"
   save_state="n"
>
</plugin>
<script>
<![CDATA[
require "wait"
win = GetPluginID()

function OnPluginClose()
    WindowDelete(win)
end

function OnPluginDisable()
    WindowRectOp(win, 2, 0,0,0,0, 0)
    map = {}
    next_map = {}
end

width = GetInfo(264)
height = GetInfo(263)
WindowCreate(win, 0, 0, width, height, miniwin.pos_center_all, miniwin.create_transparent + miniwin.create_ignore_mouse, 0)
WindowSetZOrder(win, 100000000)
WindowShow(win)
math.randomseed(os.time())
map = {}
next_map = {}

wait.make(
    function ()
        while true do
            for x = 1,width do
                if math.random() > 0.999 then
                    table.insert(map, {x,0})
                end
            end
            next_map = {}
            WindowRectOp(win, 2, 0,0,0,0, 0)
            for _,flake in ipairs(map) do
                local x = flake[1]
                local y = flake[2]
                if y < height then
                    if math.random() <= 0.95 then
                        flake[2] = y + math.random(6,10)
                    end
                    if math.random() > 0.4 then
                        flake[1] = x + math.random(-4,4)
                    end
                    table.insert(next_map, flake)
                end
                local left, top, right, bottom = x-2, y-2, x+2, y+2
                if left > 0 and right > 0 and top > 0 and bottom > 0 then
                    WindowCircleOp (
                        win, 1, left, top, right, bottom,
                        ColourNameToRGB("white"), 0, 1, ColourNameToRGB("white"), 0
                    )
                end
            end
            map = next_map
            Redraw()
            wait.time(0.01)
        end
    end
)

]]>
</script>
</muclient>