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<script src="../../../_static/underscore.js"></script>
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@ -38,7 +40,7 @@
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<div class="bodywrapper">
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<div class="body" role="main">
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<section id="turn-based-combat-system">
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<section class="tex2jax_ignore mathjax_ignore" id="turn-based-combat-system">
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<h1>Turn based Combat System<a class="headerlink" href="#turn-based-combat-system" title="Permalink to this headline">¶</a></h1>
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<p>This tutorial gives an example of a full, if simplified, combat system for Evennia. It was inspired
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by the discussions held on the <a class="reference external" href="https://groups.google.com/forum/#%21msg/evennia/wnJNM2sXSfs/-dbLRrgWnYMJ">mailing
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@ -68,7 +70,7 @@ allows for emoting as part of combat which is an advantage for roleplay-heavy ga
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<p>To implement a freeform combat system all you need is a dice roller and a roleplaying rulebook. See
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<a class="reference external" href="https://github.com/evennia/evennia/blob/master/evennia/contrib/dice.py">contrib/dice.py</a> for an
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example dice roller. To implement at twitch-based system you basically need a few combat
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<a class="reference internal" href="../../../Components/Commands.html"><span class="doc">commands</span></a>, possibly ones with a <a class="reference internal" href="../../Command-Cooldown.html"><span class="doc">cooldown</span></a>. You also need a <a class="reference internal" href="Implementing-a-game-rule-system.html"><span class="doc">game rule
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<a class="reference internal" href="../../../Components/Commands.html"><span class="doc std std-doc">commands</span></a>, possibly ones with a <a class="reference internal" href="../../Command-Cooldown.html"><span class="doc std std-doc">cooldown</span></a>. You also need a <a class="reference internal" href="Implementing-a-game-rule-system.html"><span class="doc std std-doc">game rule
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module</span></a> that makes use of it. We will focus on the turn-based
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variety here.</p>
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</section>
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@ -86,7 +88,7 @@ free.</p></li>
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<li><p>The commands are (in our example) simple; they can either <code class="docutils literal notranslate"><span class="pre">hit</span> <span class="pre"><target></span></code>, <code class="docutils literal notranslate"><span class="pre">feint</span> <span class="pre"><target></span></code> or
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<code class="docutils literal notranslate"><span class="pre">parry</span> <span class="pre"><target></span></code>. They can also <code class="docutils literal notranslate"><span class="pre">defend</span></code>, a generic passive defense. Finally they may choose to
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<code class="docutils literal notranslate"><span class="pre">disengage/flee</span></code>.</p></li>
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<li><p>When attacking we use a classic [rock-paper-scissors](https://en.wikipedia.org/wiki/Rock-paper-
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<li><p>When attacking we use a classic [rock-paper-scissors](<a class="reference external" href="https://en.wikipedia.org/wiki/Rock-paper-">https://en.wikipedia.org/wiki/Rock-paper-</a>
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scissors) mechanic to determine success: <code class="docutils literal notranslate"><span class="pre">hit</span></code> defeats <code class="docutils literal notranslate"><span class="pre">feint</span></code>, which defeats <code class="docutils literal notranslate"><span class="pre">parry</span></code> which defeats
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<code class="docutils literal notranslate"><span class="pre">hit</span></code>. <code class="docutils literal notranslate"><span class="pre">defend</span></code> is a general passive action that has a percentage chance to win against <code class="docutils literal notranslate"><span class="pre">hit</span></code>
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(only).</p></li>
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@ -98,23 +100,23 @@ reported. A new turn then begins.</p></li>
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</ul>
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<p>For creating the combat system we will need the following components:</p>
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<ul class="simple">
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<li><p>A combat handler. This is the main mechanic of the system. This is a <a class="reference internal" href="../../../Components/Scripts.html"><span class="doc">Script</span></a> object
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<li><p>A combat handler. This is the main mechanic of the system. This is a <a class="reference internal" href="../../../Components/Scripts.html"><span class="doc std std-doc">Script</span></a> object
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created for each combat. It is not assigned to a specific object but is shared by the combating
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characters and handles all the combat information. Since Scripts are database entities it also means
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that the combat will not be affected by a server reload.</p></li>
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<li><p>A combat <a class="reference internal" href="../../../Components/Command-Sets.html"><span class="doc">command set</span></a> with the relevant commands needed for combat, such as the
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<li><p>A combat <a class="reference internal" href="../../../Components/Command-Sets.html"><span class="doc std std-doc">command set</span></a> with the relevant commands needed for combat, such as the
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various attack/defend options and the <code class="docutils literal notranslate"><span class="pre">flee/disengage</span></code> command to leave the combat mode.</p></li>
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<li><p>A rule resolution system. The basics of making such a module is described in the <a class="reference internal" href="Implementing-a-game-rule-system.html"><span class="doc">rule system
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<li><p>A rule resolution system. The basics of making such a module is described in the <a class="reference internal" href="Implementing-a-game-rule-system.html"><span class="doc std std-doc">rule system
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tutorial</span></a>. We will only sketch such a module here for our end-turn
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combat resolution.</p></li>
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<li><p>An <code class="docutils literal notranslate"><span class="pre">attack</span></code> <a class="reference internal" href="../../../Components/Commands.html"><span class="doc">command</span></a> for initiating the combat mode. This is added to the default
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<li><p>An <code class="docutils literal notranslate"><span class="pre">attack</span></code> <a class="reference internal" href="../../../Components/Commands.html"><span class="doc std std-doc">command</span></a> for initiating the combat mode. This is added to the default
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command set. It will create the combat handler and add the character(s) to it. It will also assign
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the combat command set to the characters.</p></li>
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</ul>
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</section>
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<section id="the-combat-handler">
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<h2>The combat handler<a class="headerlink" href="#the-combat-handler" title="Permalink to this headline">¶</a></h2>
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<p>The <em>combat handler</em> is implemented as a stand-alone <a class="reference internal" href="../../../Components/Scripts.html"><span class="doc">Script</span></a>. This Script is created when
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<p>The <em>combat handler</em> is implemented as a stand-alone <a class="reference internal" href="../../../Components/Scripts.html"><span class="doc std std-doc">Script</span></a>. This Script is created when
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the first Character decides to attack another and is deleted when no one is fighting any more. Each
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handler represents one instance of combat and one combat only. Each instance of combat can hold any
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number of characters but each character can only be part of one combat at a time (a player would
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@ -125,172 +127,12 @@ combat. Vice-versa, all characters holds a back-reference to the current combat
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don’t use this very much here this might allow the combat commands on the characters to access and
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update the combat handler state directly.</p>
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<p><em>Note: Another way to implement a combat handler would be to use a normal Python object and handle
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time-keeping with the <a class="reference internal" href="../../../Components/TickerHandler.html"><span class="doc">TickerHandler</span></a>. This would require either adding custom hook
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time-keeping with the <a class="reference internal" href="../../../Components/TickerHandler.html"><span class="doc std std-doc">TickerHandler</span></a>. This would require either adding custom hook
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methods on the character or to implement a custom child of the TickerHandler class to track turns.
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Whereas the TickerHandler is easy to use, a Script offers more power in this case.</em></p>
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<p>Here is a basic combat handler. Assuming our game folder is named <code class="docutils literal notranslate"><span class="pre">mygame</span></code>, we store it in
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<code class="docutils literal notranslate"><span class="pre">mygame/typeclasses/combat_handler.py</span></code>:</p>
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<span class="normal">161</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="c1"># mygame/typeclasses/combat_handler.py</span>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># mygame/typeclasses/combat_handler.py</span>
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<span class="kn">import</span> <span class="nn">random</span>
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<span class="kn">from</span> <span class="nn">evennia</span> <span class="kn">import</span> <span class="n">DefaultScript</span>
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@ -452,7 +294,7 @@ Whereas the TickerHandler is easy to use, a Script offers more power in this cas
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<span class="p">(</span><span class="s2">"defend"</span><span class="p">,</span> <span class="n">character</span><span class="p">,</span> <span class="kc">None</span><span class="p">)]</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">msg_all</span><span class="p">(</span><span class="s2">"Next turn begins ..."</span><span class="p">)</span>
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</pre></div>
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</td></tr></table></div>
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</div>
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<p>This implements all the useful properties of our combat handler. This Script will survive a reboot
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and will automatically re-assert itself when it comes back online. Even the current state of the
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combat should be unaffected since it is saved in Attributes at every turn. An important part to note
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@ -468,41 +310,7 @@ an exercise.</p>
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example) very simple. In a full implementation the commands available might be determined by the
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weapon(s) held by the player or by which skills they know.</p>
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<p>We create them in <code class="docutils literal notranslate"><span class="pre">mygame/commands/combat.py</span></code>.</p>
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<span class="normal">35</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="c1"># mygame/commands/combat.py</span>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># mygame/commands/combat.py</span>
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<span class="kn">from</span> <span class="nn">evennia</span> <span class="kn">import</span> <span class="n">Command</span>
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@ -538,31 +346,12 @@ weapon(s) held by the player or by which skills they know.</p>
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<span class="c1"># tell the handler to check if turn is over</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">caller</span><span class="o">.</span><span class="n">ndb</span><span class="o">.</span><span class="n">combat_handler</span><span class="o">.</span><span class="n">check_end_turn</span><span class="p">()</span>
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</pre></div>
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</td></tr></table></div>
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</div>
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<p>The other commands <code class="docutils literal notranslate"><span class="pre">CmdParry</span></code>, <code class="docutils literal notranslate"><span class="pre">CmdFeint</span></code>, <code class="docutils literal notranslate"><span class="pre">CmdDefend</span></code> and <code class="docutils literal notranslate"><span class="pre">CmdDisengage</span></code> look basically the same.
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||||
We should also add a custom <code class="docutils literal notranslate"><span class="pre">help</span></code> command to list all the available combat commands and what they
|
||||
do.</p>
|
||||
<p>We just need to put them all in a cmdset. We do this at the end of the same module:</p>
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
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|
||||
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|
||||
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|
||||
<span class="normal">20</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="c1"># mygame/commands/combat.py</span>
|
||||
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># mygame/commands/combat.py</span>
|
||||
|
||||
<span class="kn">from</span> <span class="nn">evennia</span> <span class="kn">import</span> <span class="n">CmdSet</span>
|
||||
<span class="kn">from</span> <span class="nn">evennia</span> <span class="kn">import</span> <span class="n">default_cmds</span>
|
||||
|
|
@ -583,7 +372,7 @@ do.</p>
|
|||
<span class="bp">self</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">default_cmds</span><span class="o">.</span><span class="n">CmdPose</span><span class="p">())</span>
|
||||
<span class="bp">self</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">default_cmds</span><span class="o">.</span><span class="n">CmdSay</span><span class="p">())</span>
|
||||
</pre></div>
|
||||
</td></tr></table></div>
|
||||
</div>
|
||||
</section>
|
||||
<section id="rules-module">
|
||||
<h2>Rules module<a class="headerlink" href="#rules-module" title="Permalink to this headline">¶</a></h2>
|
||||
|
|
@ -611,83 +400,7 @@ subsequent attack and so on …</em></p>
|
|||
<li><p><code class="docutils literal notranslate"><span class="pre">flee/disengage</span></code> must succeed two times in a row (i.e. not beaten by a <code class="docutils literal notranslate"><span class="pre">hit</span></code> once during the
|
||||
turn). If so the character leaves combat.</p></li>
|
||||
</ul>
|
||||
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|
||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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||||
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|
||||
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||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
<span class="normal">77</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="c1"># mygame/world/rules.py</span>
|
||||
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># mygame/world/rules.py</span>
|
||||
|
||||
<span class="kn">import</span> <span class="nn">random</span>
|
||||
|
||||
|
|
@ -765,7 +478,7 @@ turn). If so the character leaves combat.</p></li>
|
|||
<span class="n">combat_handler</span><span class="o">.</span><span class="n">msg_all</span><span class="p">(</span><span class="sa">f</span><span class="s2">"</span><span class="si">{</span><span class="n">char</span><span class="si">}</span><span class="s2"> withdraws from combat."</span><span class="p">)</span>
|
||||
<span class="n">combat_handler</span><span class="o">.</span><span class="n">remove_character</span><span class="p">(</span><span class="n">char</span><span class="p">)</span>
|
||||
</pre></div>
|
||||
</td></tr></table></div>
|
||||
</div>
|
||||
<p>To make it simple (and to save space), this example rule module actually resolves each interchange
|
||||
twice - first when it gets to each character and then again when handling the target. Also, since we
|
||||
use the combat handler’s <code class="docutils literal notranslate"><span class="pre">msg_all</span></code> method here, the system will get pretty spammy. To clean it up,
|
||||
|
|
@ -776,43 +489,7 @@ reported once.</p>
|
|||
<h2>Combat initiator command<a class="headerlink" href="#combat-initiator-command" title="Permalink to this headline">¶</a></h2>
|
||||
<p>This is the last component we need, a command to initiate combat. This will tie everything together.
|
||||
We store this with the other combat commands.</p>
|
||||
<div class="highlight-python notranslate"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
|
||||
<span class="normal"> 2</span>
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
<span class="normal">36</span>
|
||||
<span class="normal">37</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="c1"># mygame/commands/combat.py</span>
|
||||
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># mygame/commands/combat.py</span>
|
||||
|
||||
<span class="kn">from</span> <span class="nn">evennia</span> <span class="kn">import</span> <span class="n">create_script</span>
|
||||
|
||||
|
|
@ -850,9 +527,9 @@ We store this with the other combat commands.</p>
|
|||
<span class="bp">self</span><span class="o">.</span><span class="n">caller</span><span class="o">.</span><span class="n">msg</span><span class="p">(</span><span class="sa">f</span><span class="s2">"You attack </span><span class="si">{</span><span class="n">target</span><span class="si">}</span><span class="s2">! You are in combat."</span><span class="p">)</span>
|
||||
<span class="n">target</span><span class="o">.</span><span class="n">msg</span><span class="p">(</span><span class="sa">f</span><span class="s2">"</span><span class="si">{</span><span class="bp">self</span><span class="o">.</span><span class="n">caller</span><span class="si">}</span><span class="s2"> attacks you! You are in combat."</span><span class="p">)</span>
|
||||
</pre></div>
|
||||
</td></tr></table></div>
|
||||
</div>
|
||||
<p>The <code class="docutils literal notranslate"><span class="pre">attack</span></code> command will not go into the combat cmdset but rather into the default cmdset. See e.g.
|
||||
the <a class="reference internal" href="../Part1/Adding-Commands.html"><span class="doc">Adding Command Tutorial</span></a> if you are unsure about how to do this.</p>
|
||||
the <a class="reference internal" href="../Part1/Adding-Commands.html"><span class="doc std std-doc">Adding Command Tutorial</span></a> if you are unsure about how to do this.</p>
|
||||
</section>
|
||||
<section id="expanding-the-example">
|
||||
<h2>Expanding the example<a class="headerlink" href="#expanding-the-example" title="Permalink to this headline">¶</a></h2>
|
||||
|
|
@ -921,7 +598,7 @@ show others what’s going on.</p>
|
|||
<h3>Versions</h3>
|
||||
<ul>
|
||||
<li><a href="Turn-based-Combat-System.html">1.0-dev (develop branch)</a></li>
|
||||
<li><a href="../../../../0.9.5/index.html">0.9.5 (v0.9.5 branch)</a></li>
|
||||
<li><a href="../../../../0.95/index.html">0.95 (v0.9.5 branch)</a></li>
|
||||
</ul>
|
||||
|
||||
</div>
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue