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<title>Weather Tutorial &#8212; Evennia 1.0-dev documentation</title>
<link rel="stylesheet" href="_static/nature.css" type="text/css" />
<link rel="stylesheet" href="_static/pygments.css" type="text/css" />
<script id="documentation_options" data-url_root="./" src="_static/documentation_options.js"></script>
<script src="_static/jquery.js"></script>
<script src="_static/underscore.js"></script>
<script src="_static/doctools.js"></script>
<script src="_static/language_data.js"></script>
<link rel="shortcut icon" href="_static/favicon.ico"/>
<link rel="index" title="Index" href="genindex.html" />
<link rel="search" title="Search" href="search.html" />
@ -25,7 +27,10 @@
<li class="right" >
<a href="py-modindex.html" title="Python Module Index"
>modules</a> |</li>
<li class="nav-item nav-item-0"><a href="index.html">Evennia 1.0-dev documentation</a> &#187;</li>
<li class="nav-item nav-item-0"><a href="index.html">Evennia 1.0-dev documentation</a> &#187;</li>
<li class="nav-item nav-item-last"><a href="#">Weather Tutorial</a></li>
</ul>
</div>
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<div class="section" id="weather-tutorial">
<h1>Weather Tutorial<a class="headerlink" href="#weather-tutorial" title="Permalink to this headline"></a></h1>
<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>
<p>Evennia offers the <a class="reference internal" href="TickerHandler.html"><span class="doc">TickerHandler</span></a> specifically for using the subscription model. We 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>
<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>
<p>Evennia offers the <a class="reference internal" href="TickerHandler.html"><span class="doc">TickerHandler</span></a> specifically for using the subscription model. We
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>
<div class="highlight-python notranslate"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
2
3
@ -83,9 +97,14 @@
<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>
</td></tr></table></div>
<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’t care what weather came before it. Expanding it to be more realistic is a useful exercise.</p>
<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’t care what
weather came before it. Expanding it to be more realistic is a useful exercise.</p>
</div>
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<li class="right" >
<a href="py-modindex.html" title="Python Module Index"
>modules</a> |</li>
<li class="nav-item nav-item-0"><a href="index.html">Evennia 1.0-dev documentation</a> &#187;</li>
<li class="nav-item nav-item-0"><a href="index.html">Evennia 1.0-dev documentation</a> &#187;</li>
<li class="nav-item nav-item-last"><a href="#">Weather Tutorial</a></li>
</ul>
</div>
<div class="footer" role="contentinfo">