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<h3><a href="../index.html">Table of Contents</a></h3>
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<li><a class="reference internal" href="#">Give objects weight</a><ul>
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<li><a class="reference internal" href="#limit-inventory-by-weight-carried">Limit inventory by weight carried</a></li>
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<section class="tex2jax_ignore mathjax_ignore" id="give-objects-weight">
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<h1>Give objects weight<a class="headerlink" href="#give-objects-weight" title="Permalink to this headline">¶</a></h1>
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<p>All in-game objets you can touch usually has some weight. What weight does varies from game to game. Commonly it limits how much you can carry. A heavy stone may also hurt you more than a ballon, if it falls on you. If you want to get fancy, a pressure plate may only trigger if the one stepping on it is heavy enough.</p>
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<div class="highlight-python notranslate"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
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<span class="normal"> 2</span>
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<span class="normal"> 3</span>
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<span class="normal"> 4</span>
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<span class="normal"> 5</span>
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<span class="normal"> 6</span>
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<span class="normal"> 7</span>
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<span class="normal"> 8</span>
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<span class="normal"> 9</span>
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<span class="normal">10</span>
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<span class="normal">11</span>
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<span class="normal">12</span>
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<span class="normal">13</span>
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<span class="normal">14</span>
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<span class="normal">15</span>
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<span class="normal">16</span></pre></div></td><td class="code"><div><pre><span></span><span class="c1"># inside your mygame/typeclasses/objects.py</span>
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<span class="kn">from</span> <span class="nn">evennia</span> <span class="kn">import</span> <span class="n">DefaultObject</span>
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<span class="kn">from</span> <span class="nn">evennia</span> <span class="kn">import</span> <span class="n">AttributeProperty</span>
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<span class="hll"><span class="k">class</span> <span class="nc">ObjectParent</span><span class="p">:</span>
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</span>
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<span class="hll"> <span class="n">weight</span> <span class="o">=</span> <span class="n">AttributeProperty</span><span class="p">(</span><span class="n">default</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">autocreate</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
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</span>
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<span class="hll"> <span class="nd">@property</span>
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</span> <span class="k">def</span> <span class="nf">total_weight</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="hll"> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">weight</span> <span class="o">+</span> <span class="nb">sum</span><span class="p">(</span><span class="n">obj</span><span class="o">.</span><span class="n">total_weight</span> <span class="k">for</span> <span class="n">obj</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">contents</span><span class="p">)</span>
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</span>
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<span class="k">class</span> <span class="nc">Object</span><span class="p">(</span><span class="n">ObjectParent</span><span class="p">,</span> <span class="n">DefaultObject</span><span class="p">):</span>
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<span class="c1"># ...</span>
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</pre></div></td></tr></table></div>
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</div>
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<aside class="sidebar">
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<p class="sidebar-title">Why not mass? </p>
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<p>Yes, we know weight varies with gravity. ‘Mass’ is more scientifically correct. But ‘mass’ is less commonly used in RPGs, so we stick to ‘weight’ here. Just know if if your sci-fi characters can vacation on the Moon (1/6 gravity of Earth) you should consider using <code class="docutils literal notranslate"><span class="pre">mass</span></code> everywhere and calculate the current weight on the fly.</p>
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</aside>
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<ul class="simple">
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<li><p><strong>Line 6</strong>: We use the <code class="docutils literal notranslate"><span class="pre">ObjectParent</span></code> mixin. Since this mixin is used for <code class="docutils literal notranslate"><span class="pre">Characters</span></code>, <code class="docutils literal notranslate"><span class="pre">Exits</span></code> and <code class="docutils literal notranslate"><span class="pre">Rooms</span></code> as well as for <code class="docutils literal notranslate"><span class="pre">Object</span></code>, it means all of those will automatically <em>also</em> have weight!</p></li>
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<li><p><strong>Line 8</strong>: We use an <a class="reference internal" href="../Components/Attributes.html#using-attributeproperty"><span class="std std-doc">AttributeProperty</span></a> to set up the ‘default’ weight of 1 (whatever that is). Setting <code class="docutils literal notranslate"><span class="pre">autocreate=False</span></code> means no actual <code class="docutils literal notranslate"><span class="pre">Attribute</span></code> will be created until the weight is actually changed from the default of 1. See the <code class="docutils literal notranslate"><span class="pre">AttributeProperty</span></code> documentation for caveats with this.</p></li>
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<li><p><strong>Line 10 and 11</strong>: Using the <code class="docutils literal notranslate"><span class="pre">@property</span></code> decorator on <code class="docutils literal notranslate"><span class="pre">total_weight</span></code> means that we will be able to call <code class="docutils literal notranslate"><span class="pre">obj.total_weight</span></code> instead of <code class="docutils literal notranslate"><span class="pre">obj.total_weight()</span></code> later.</p></li>
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<li><p><strong>Line 12</strong>: We sum up all weights from everything “in” this object, by looping over <code class="docutils literal notranslate"><span class="pre">self.contents</span></code>. Since <em>all</em> objects will have weight now, this should always work!</p></li>
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</ul>
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<p>Let’s check out the weight of some trusty boxes</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">></span> <span class="n">create</span><span class="o">/</span><span class="n">drop</span> <span class="n">box1</span>
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<span class="o">></span> <span class="n">py</span> <span class="bp">self</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="s2">"box1"</span><span class="p">)</span><span class="o">.</span><span class="n">weight</span>
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<span class="mi">1</span>
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<span class="o">></span> <span class="n">py</span> <span class="bp">self</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="s2">"box1"</span><span class="p">)</span><span class="o">.</span><span class="n">total_weight</span>
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<span class="mi">1</span>
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</pre></div>
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</div>
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<p>Let’s put another box into the first one.</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">></span> <span class="n">create</span><span class="o">/</span><span class="n">drop</span> <span class="n">box2</span>
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<span class="o">></span> <span class="n">py</span> <span class="bp">self</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="s2">"box2"</span><span class="p">)</span><span class="o">.</span><span class="n">total_weight</span>
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<span class="mi">1</span>
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<span class="o">></span> <span class="n">py</span> <span class="bp">self</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="s2">"box2"</span><span class="p">)</span><span class="o">.</span><span class="n">location</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="s2">"box1"</span><span class="p">)</span>
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<span class="o">></span> <span class="n">py</span> <span class="bp">self</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="n">box1</span><span class="p">)</span><span class="o">.</span><span class="n">total_weight</span>
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<span class="mi">2</span>
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</pre></div>
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</div>
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<section id="limit-inventory-by-weight-carried">
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<h2>Limit inventory by weight carried<a class="headerlink" href="#limit-inventory-by-weight-carried" title="Permalink to this headline">¶</a></h2>
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<p>To limit how much you can carry, you first need to know your own strength</p>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># in mygame/typeclasses/characters.py </span>
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<span class="kn">from</span> <span class="nn">evennia</span> <span class="kn">import</span> <span class="n">AttributeProperty</span>
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<span class="c1"># ... </span>
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<span class="k">class</span> <span class="nc">Character</span><span class="p">(</span><span class="n">ObjectParent</span><span class="p">,</span> <span class="n">DefaultCharacter</span><span class="p">):</span>
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<span class="n">carrying_capacity</span> <span class="o">=</span> <span class="n">AttributeProperty</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="n">autocreate</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
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<span class="nd">@property</span>
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<span class="k">def</span> <span class="nf">carried_weight</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">total_weight</span> <span class="o">-</span> <span class="bp">self</span><span class="o">.</span><span class="n">weight</span>
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</pre></div>
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</div>
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<p>Here we make sure to add another <code class="docutils literal notranslate"><span class="pre">AttributeProperty</span></code> telling us how much to carry. In a real game, this may be based on how strong the Character is. When we consider how much weight we already carry, we should not include <em>our own</em> weight, so we subtract that.</p>
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<p>To honor this limit, we’ll need to override the default <code class="docutils literal notranslate"><span class="pre">get</span></code> command.</p>
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<aside class="sidebar">
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<p class="sidebar-title">Overriding default commands</p>
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<p>In this example, we implement the beginning of the <code class="docutils literal notranslate"><span class="pre">CmdGet</span></code> and then call the full <code class="docutils literal notranslate"><span class="pre">CmdGet()</span></code> at the end. This is not very efficient, because the parent <code class="docutils literal notranslate"><span class="pre">CmdGet</span></code> will again have to do the <code class="docutils literal notranslate"><span class="pre">caller.search()</span></code> again. To be more efficient, you will likely want to copy the entirety of the <code class="docutils literal notranslate"><span class="pre">CmdGet</span></code> code into your own version and modify it.</p>
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</aside>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># in mygame/commands/command.py </span>
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<span class="c1"># ... </span>
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<span class="kn">from</span> <span class="nn">evennia</span> <span class="kn">import</span> <span class="n">default_cmds</span>
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<span class="c1"># ... </span>
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<span class="k">class</span> <span class="nc">WeightAwareCmdGet</span><span class="p">(</span><span class="n">default_cmds</span><span class="o">.</span><span class="n">CmdGet</span><span class="p">):</span>
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<span class="k">def</span> <span class="nf">func</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="n">caller</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">caller</span>
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<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">args</span><span class="p">:</span>
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<span class="n">caller</span><span class="o">.</span><span class="n">msg</span><span class="p">(</span><span class="s2">"Get what?"</span><span class="p">)</span>
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<span class="k">return</span>
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<span class="n">obj</span> <span class="o">=</span> <span class="n">caller</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">args</span><span class="p">)</span>
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<span class="k">if</span> <span class="p">(</span><span class="n">obj</span><span class="o">.</span><span class="n">weight</span> <span class="o">+</span> <span class="n">caller</span><span class="o">.</span><span class="n">carried_weight</span>
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<span class="o">></span> <span class="n">caller</span><span class="o">.</span><span class="n">carrying_capacity</span><span class="p">):</span>
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<span class="n">caller</span><span class="o">.</span><span class="n">msg</span><span class="p">(</span><span class="s2">"You can't carry that much!"</span><span class="p">)</span>
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<span class="k">return</span>
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<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">func</span><span class="p">()</span>
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</pre></div>
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</div>
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<p>Here we add an extra check for the weight of the thing we are trying to pick up, then we call the normal <code class="docutils literal notranslate"><span class="pre">CmdGet</span></code> with <code class="docutils literal notranslate"><span class="pre">super().func()</span></code>.</p>
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</section>
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</section>
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