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< section class = "tex2jax_ignore mathjax_ignore" id = "weather-tutorial" >
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< h1 > Weather Tutorial< a class = "headerlink" href = "#weather-tutorial" title = "Permalink to this headline" > ¶< / a > < / h1 >
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< p > This tutorial will have us create a simple weather system for our MUD. The way we want to use this
is to have all outdoor rooms echo weather-related messages to the room at regular and semi-random
intervals. Things like “Clouds gather above”, “It starts to rain” and so on.< / p >
< p > One could imagine every outdoor room in the game having a script running on themselves that fires
regularly. For this particular example it is however more efficient to do it another way, namely by
using a “ticker-subscription” model. The principle is simple: Instead of having each Object
individually track the time, they instead subscribe to be called by a global ticker who handles time
keeping. Not only does this centralize and organize much of the code in one place, it also has less
computing overhead.< / p >
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< p > Evennia offers the < a class = "reference internal" href = "../Components/TickerHandler.html" > < span class = "doc std std-doc" > TickerHandler< / span > < / a > specifically for using the subscription model. We
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will use it for our weather system.< / p >
< p > We will assume you know how to make your own Typeclasses. If not see one of the beginning tutorials.
We will create a new WeatherRoom typeclass that is aware of the day-night cycle.< / p >
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< div class = "highlight-python notranslate" > < div class = "highlight" > < pre > < span > < / span >
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< span class = "kn" > import< / span > < span class = "nn" > random< / span >
< span class = "kn" > from< / span > < span class = "nn" > evennia< / span > < span class = "kn" > import< / span > < span class = "n" > DefaultRoom< / span > < span class = "p" > ,< / span > < span class = "n" > TICKER_HANDLER< / span >
< span class = "n" > ECHOES< / span > < span class = "o" > =< / span > < span class = "p" > [< / span > < span class = "s2" > " The sky is clear." < / span > < span class = "p" > ,< / span >
< span class = "s2" > " Clouds gather overhead." < / span > < span class = "p" > ,< / span >
< span class = "s2" > " It' s starting to drizzle." < / span > < span class = "p" > ,< / span >
< span class = "s2" > " A breeze of wind is felt." < / span > < span class = "p" > ,< / span >
< span class = "s2" > " The wind is picking up" < / span > < span class = "p" > ]< / span > < span class = "c1" > # etc < / span >
< span class = "k" > class< / span > < span class = "nc" > WeatherRoom< / span > < span class = "p" > (< / span > < span class = "n" > DefaultRoom< / span > < span class = "p" > ):< / span >
< span class = "s2" > " This room is ticked at regular intervals" < / span >
< span class = "k" > def< / span > < span class = "nf" > at_object_creation< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ):< / span >
< span class = "s2" > " called only when the object is first created" < / span >
< span class = "n" > TICKER_HANDLER< / span > < span class = "o" > .< / span > < span class = "n" > add< / span > < span class = "p" > (< / span > < span class = "mi" > 60< / span > < span class = "o" > *< / span > < span class = "mi" > 60< / span > < span class = "p" > ,< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > at_weather_update< / span > < span class = "p" > )< / span >
< span class = "k" > def< / span > < span class = "nf" > at_weather_update< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ,< / span > < span class = "o" > *< / span > < span class = "n" > args< / span > < span class = "p" > ,< / span > < span class = "o" > **< / span > < span class = "n" > kwargs< / span > < span class = "p" > ):< / span >
< span class = "s2" > " ticked at regular intervals" < / span >
< span class = "n" > echo< / span > < span class = "o" > =< / span > < span class = "n" > random< / span > < span class = "o" > .< / span > < span class = "n" > choice< / span > < span class = "p" > (< / span > < span class = "n" > ECHOES< / span > < span class = "p" > )< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > msg_contents< / span > < span class = "p" > (< / span > < span class = "n" > echo< / span > < span class = "p" > )< / span >
< / pre > < / div >
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< p > In the < code class = "docutils literal notranslate" > < span class = "pre" > at_object_creation< / span > < / code > method, we simply added ourselves to the TickerHandler and tell it to
call < code class = "docutils literal notranslate" > < span class = "pre" > at_weather_update< / span > < / code > every hour (< code class = "docutils literal notranslate" > < span class = "pre" > 60*60< / span > < / code > seconds). During testing you might want to play with a
shorter time duration.< / p >
< p > For this to work we also create a custom hook < code class = "docutils literal notranslate" > < span class = "pre" > at_weather_update(*args,< / span > < span class = "pre" > **kwargs)< / span > < / code > , which is the
call sign required by TickerHandler hooks.< / p >
< p > Henceforth the room will inform everyone inside it when the weather changes. This particular example
is of course very simplistic - the weather echoes are just randomly chosen and don’
weather came before it. Expanding it to be more realistic is a useful exercise.< / p >
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