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<title>Radio Buttons — VPython 3.2 documentation</title>
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<section id="radio-buttons">
<h1>Radio Buttons<a class="headerlink" href="#radio-buttons" title="Permalink to this heading">¶</a></h1>
<a class="reference internal image-reference" href="_images/radio.png"><img alt="_images/radio.png" src="_images/radio.png" style="width: 250px;" /></a>
<p>A group of radio buttons offer exclusive choices. Checking one will uncheck all others. All radio buttons in a group must have the same <em>name</em> attribute.</p>
<dl class="py function">
<dt class="sig sig-object py" id="radio">
<span class="sig-name descname"><span class="pre">radio</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">bind</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">myfunction</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">text</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">'mytext'</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">name</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">'mygroup'</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#radio" 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>bind</strong> (<em>function</em>) – The function to be called when the box is checked or unchecked.</p></li>
<li><p><strong>text</strong> (<em>string</em>) – The text displayed next to the box.</p></li>
<li><p><strong>name</strong> (<em>string</em>) – Name of the group of radio buttons to which this belongs.</p></li>
<li><p><strong>checked</strong> (<em>boolean</em>) – If True, the box is checked. Default False.</p></li>
<li><p><strong>pos</strong> (<em>attribute of canvas</em>) – Location of checkbox. Default is scene.caption_anchor.</p></li>
<li><p><strong>disabled</strong> (<em>boolean</em>) – If True, the checkbox is grayed out and inactive.</p></li>
<li><p><strong>delete</strong><strong>(</strong><strong>)</strong> – <code class="docutils literal notranslate"><span class="pre">mywidget.delete()</span></code> deletes the widget.</p></li>
</ul>
</dd>
</dl>
</dd></dl>
<p>A group of radio buttons that control the color of a sphere:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">ball</span> <span class="o">=</span> <span class="n">sphere</span><span class="p">(</span><span class="n">color</span><span class="o">=</span><span class="n">color</span><span class="o">.</span><span class="n">red</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">rfun</span><span class="p">(</span><span class="n">evt</span><span class="p">):</span>
<span class="k">if</span> <span class="n">evt</span><span class="o">.</span><span class="n">text</span> <span class="ow">is</span><span class="s1">'red'</span><span class="p">:</span>
<span class="n">ball</span><span class="o">.</span><span class="n">color</span><span class="o">=</span><span class="n">color</span><span class="o">.</span><span class="n">red</span>
<span class="k">elif</span> <span class="n">evt</span><span class="o">.</span><span class="n">text</span> <span class="ow">is</span> <span class="s1">'green'</span><span class="p">:</span>
<span class="n">ball</span><span class="o">.</span><span class="n">color</span><span class="o">=</span><span class="n">color</span><span class="o">.</span><span class="n">green</span>
<span class="k">elif</span> <span class="n">evt</span><span class="o">.</span><span class="n">text</span> <span class="ow">is</span> <span class="s1">'blue'</span><span class="p">:</span>
<span class="n">ball</span><span class="o">.</span><span class="n">color</span><span class="o">=</span><span class="n">color</span><span class="o">.</span><span class="n">blue</span>
<span class="n">redbutton</span> <span class="o">=</span> <span class="n">radio</span><span class="p">(</span><span class="n">bind</span><span class="o">=</span><span class="n">rfun</span><span class="p">,</span> <span class="n">text</span><span class="o">=</span><span class="s1">'red'</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="s1">'colors'</span><span class="p">,</span> <span class="n">checked</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="n">greenbutton</span> <span class="o">=</span> <span class="n">radio</span><span class="p">(</span><span class="n">bind</span><span class="o">=</span><span class="n">rfun</span><span class="p">,</span> <span class="n">text</span><span class="o">=</span><span class="s1">'green'</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="s1">'colors'</span><span class="p">)</span>
<span class="n">bluebutton</span> <span class="o">=</span> <span class="n">radio</span><span class="p">(</span><span class="n">bind</span><span class="o">=</span><span class="n">rfun</span><span class="p">,</span> <span class="n">text</span><span class="o">=</span><span class="s1">'blue'</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="s1">'colors'</span><span class="p">)</span>
</pre></div>
</div>
<section id="radio-button-event-attributes">
<h2>Radio Button Event Attributes<a class="headerlink" href="#radio-button-event-attributes" title="Permalink to this heading">¶</a></h2>
<p>The argument of the event handler function (‘evt’, in the code above) will have the following attributes (properties of the radio button at the time it was clicked):</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">evt.text</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">evt.checked</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">evt.disabled</span></code></p></li>
</ul>
<p>Additionally, any attributes you have created for the widget (for example, <code class="docutils literal notranslate"><span class="pre">name</span></code> or <code class="docutils literal notranslate"><span class="pre">id</span></code>), will be available as attributes of <code class="docutils literal notranslate"><span class="pre">evt</span></code>.</p>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<p><a class="reference internal" href="userinput.html#eventhandler"><span class="std std-ref">Event Handlers</span></a>; <a class="reference internal" href="userinput.html#event-handling"><span class="std std-ref">Processing Events</span></a>; <a class="reference internal" href="userinput.html#polling"><span class="std std-ref">Polling</span></a>; <a class="reference internal" href="widgetPosition.html"><span class="doc">Widget Position</span></a></p>
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