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<div class="bodywrapper">
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<div class="body" role="main">
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<section id="mass-and-weight-for-objects">
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<section class="tex2jax_ignore mathjax_ignore" id="mass-and-weight-for-objects">
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<h1>Mass and weight for objects<a class="headerlink" href="#mass-and-weight-for-objects" title="Permalink to this headline">¶</a></h1>
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<p>An easy addition to add dynamic variety to your world objects is to give them some mass. Why mass
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and not weight? Weight varies in setting; for example things on the Moon weigh 1/6 as much. On
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@ -52,13 +54,7 @@ force.</p>
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<p>Now that we have reasons for keeping track of object mass, let’s look at the default object class
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inside your mygame/typeclasses/objects.py and see how easy it is to total up mass from an object and
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its contents.</p>
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<div class="highlight-python notranslate"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
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<span class="normal">7</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="c1"># inside your mygame/typeclasses/objects.py</span>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># inside your mygame/typeclasses/objects.py</span>
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<span class="k">class</span> <span class="nc">Object</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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@ -66,7 +62,7 @@ its contents.</p>
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<span class="n">mass</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">attributes</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'mass'</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span> <span class="c1"># Default objects have 1 unit mass.</span>
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<span class="k">return</span> <span class="n">mass</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">get_mass</span><span class="p">()</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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</pre></div>
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</td></tr></table></div>
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</div>
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<p>Adding the <code class="docutils literal notranslate"><span class="pre">get_mass</span></code> definition to the objects you want to sum up the masses for is done with
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Python’s “sum” function which operates on all the contents, in this case by summing them to
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return a total mass value.</p>
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@ -84,54 +80,18 @@ gold bricks, you might wonder if this elevator’s going to move, and how fast.<
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<code class="docutils literal notranslate"><span class="pre">@set</span> <span class="pre">elevator/mass=1000000</span></code>, we’re <code class="docutils literal notranslate"><span class="pre">@set</span> <span class="pre">me/mass=85000</span></code> and our armor is <code class="docutils literal notranslate"><span class="pre">@set</span> <span class="pre">armor/mass=50000</span></code>.
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We’re each carrying 20 gold bars each <code class="docutils literal notranslate"><span class="pre">@set</span> <span class="pre">gold</span> <span class="pre">bar/mass=12400</span></code> then step into the elevator and see
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the following message in the elevator’s appearance: <code class="docutils literal notranslate"><span class="pre">Elevator</span> <span class="pre">weight</span> <span class="pre">and</span> <span class="pre">contents</span> <span class="pre">should</span> <span class="pre">not</span> <span class="pre">exceed</span> <span class="pre">3</span> <span class="pre">metric</span> <span class="pre">tons.</span></code> Are we safe? Maybe not if you consider dynamic loading. But at rest:</p>
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<div class="highlight-python notranslate"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
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<span class="normal">5</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="c1"># Elevator object knows when it checks itself:</span>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># Elevator object knows when it checks itself:</span>
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<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_mass</span><span class="p">()</span> <span class="o"><</span> <span class="mi">3000000</span><span class="p">:</span>
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<span class="k">pass</span> <span class="c1"># Elevator functions as normal.</span>
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<span class="k">else</span><span class="p">:</span>
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<span class="k">pass</span> <span class="c1"># Danger! Alarm sounds, cable snaps, elevator stops...</span>
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</pre></div>
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</td></tr></table></div>
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</div>
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</section>
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<section id="inventory">
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<h2>Inventory<a class="headerlink" href="#inventory" title="Permalink to this headline">¶</a></h2>
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<p>Example of listing mass of items in your inventory:</p>
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<div class="highlight-python notranslate"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
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<span class="normal">33</span></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">CmdInventory</span><span class="p">(</span><span class="n">MuxCommand</span><span class="p">):</span>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">CmdInventory</span><span class="p">(</span><span class="n">MuxCommand</span><span class="p">):</span>
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<span class="sd">"""</span>
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<span class="sd"> view inventory</span>
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<span class="sd"> Usage:</span>
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<span class="p">])</span>
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<span class="n">string</span> <span class="o">=</span> <span class="sa">f</span><span class="s2">"|wYou are carrying:</span><span class="se">\n</span><span class="si">{</span><span class="n">table</span><span class="si">}</span><span class="s2">"</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">msg</span><span class="p">(</span><span class="n">string</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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</section>
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</section>
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<h3>Versions</h3>
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<ul>
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<li><a href="Mass-and-weight-for-objects.html">1.0-dev (develop branch)</a></li>
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<li><a href="../../0.9.5/index.html">0.9.5 (v0.9.5 branch)</a></li>
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<li><a href="../../0.95/index.html">0.95 (v0.9.5 branch)</a></li>
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</ul>
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</div>
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