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<title>arrow — VPython 3.2 documentation</title>
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<section id="arrow">
<h1>arrow<a class="headerlink" href="#arrow" title="Permalink to this heading">¶</a></h1>
<img alt="_images/arrow.jpg" src="_images/arrow.jpg" />
<a class="reference internal image-reference" href="_images/arrowaxis.png"><img alt="_images/arrowaxis.png" src="_images/arrowaxis.png" style="width: 200px;" /></a>
<dl class="py function">
<dt class="sig sig-object py" id="id0">
<span class="sig-name descname"><span class="pre">arrow</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">pos</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">vec(0,</span> <span class="pre">0,</span> <span class="pre">0)</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">axis</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">vec(1,</span> <span class="pre">0,</span> <span class="pre">0)</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">color</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">color.orange</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#id0" title="Permalink to this definition">¶</a></dt>
<dd><dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>pos</strong> (<em>vector</em>) – Position of tail. Default <0,0,0>.</p></li>
<li><p><strong>axis</strong> (<em>vector</em>) – Extends from tail to tip. Default <1,0,0>.</p></li>
<li><p><strong>color</strong> (<em>vector</em>) – Default is <em>color.white</em></p></li>
<li><p><strong>round</strong> (<em>boolean</em>) – Makes shaft and head round instead of square. Default is <em>False</em>.</p></li>
<li><p><strong>shaftwidth</strong> (<em>scalar</em>) – Width of tail. Default 0.1*(length of arrow)</p></li>
<li><p><strong>headwidth</strong> (<em>scalar</em>) – Default 2*shaftwidth</p></li>
<li><p><strong>headlength</strong> (<em>scalar</em>) – Default 3*shaftwidth</p></li>
</ul>
</dd>
</dl>
</dd></dl>
<p>If you don’t set <em>shaftwidth</em>, shorter arrows will be smaller in all dimensions than longer arrows (first image below). By setting <em>shaftwidth</em> you can ensure that all arrows will have the same cross sectional area (second image below).</p>
<img alt="_images/shaftwidth2a.png" src="_images/shaftwidth2a.png" />
<img alt="_images/shaftwidth2b.png" src="_images/shaftwidth2b.png" />
<p>Note that, if you do set <em>shaftwidth</em>, the <em>headlength</em> of extremely short arrows may need to be adjusted.</p>
<p>Attributes used less often:</p>
<dl class="py function">
<dt class="sig sig-object py">
<span class="sig-name descname"><span class="pre">arrow</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">opacity</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">0.5</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">shininess</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">0.2</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">texture</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">textures.wood</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">make_trail</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">True</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">canvas</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">mycanvas</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">emissive</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em><span class="sig-paren">)</span></dt>
<dd><dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>opacity</strong> (<em>scalar</em>) – Default 1.0; Range 0-1.</p></li>
<li><p><strong>shininess</strong> (<em>scalar</em>) – Default 0.6; Range 0-1.</p></li>
<li><p><strong>emissive</strong> (<em>boolean</em>) – Default False. Object glows, losing all shading, if True.</p></li>
<li><p><strong>texture</strong> (<em>class element</em><em> or </em><em>path</em>) – Default None.</p></li>
<li><p><strong>visible</strong> (<em>boolean</em>) – If False, object is not displayed. Default: True</p></li>
<li><p><strong>canvas</strong> (<em>object</em>) – Default is <code class="xref py py-attr docutils literal notranslate"><span class="pre">scene</span></code>.</p></li>
<li><p><strong>make_trail</strong> (<em>boolean</em>) – If True, object leaves a trail when moved.</p></li>
<li><p><strong>up</strong> (<em>vector</em>) – A vector perpendicular to the axis.</p></li>
<li><p><strong>group</strong> (<em>object</em>) – The group to which this object belongs.</p></li>
</ul>
</dd>
</dl>
</dd></dl>
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<p class="admonition-title">See also</p>
<p><a class="reference internal" href="canvas.html"><span class="doc">canvas</span></a>; <a class="reference internal" href="color.html"><span class="doc">color</span></a>; <a class="reference internal" href="emissive.html"><span class="doc">emissive</span></a>; <a class="reference internal" href="trail.html"><span class="doc">make_trail</span></a>; <a class="reference internal" href="opacity.html"><span class="doc">opacity</span></a>; <a class="reference internal" href="rotation.html"><span class="doc">rotate</span></a>; <a class="reference internal" href="texture.html"><span class="doc">texture</span></a>;</p>
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