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<!DOCTYPE html>
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<title>Sliders — VPython 3.2 documentation</title>
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<section id="sliders">
<h1>Sliders<a class="headerlink" href="#sliders" title="Permalink to this heading">¶</a></h1>
<a class="reference internal image-reference" href="_images/slider.png"><img alt="_images/slider.png" src="_images/slider.png" style="width: 250px;" /></a>
<p>Sliders are widgets that give a numerical value. Dragging a slider invokes a function (an event handler). The attributes below are labeled “not modifiable” if they cannot be modified after creating the slider. The demo program <a class="reference external" href="https://www.glowscript.org/#/user/GlowScriptDemos/folder/Examples/program/Color-RGB-HSV-VPython">Color-RBG-HSV</a> uses multiple sliders to adjust colors.</p>
<dl class="py function">
<dt class="sig sig-object py">
<span class="sig-name descname"><span class="pre">myslider</span> <span class="pre">=</span> <span class="pre">slider(</span> <span class="pre">bind=myaction,</span> <span class="pre">min=0,</span> <span class="pre">max=50</span> <span class="pre">)</span></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>bind</strong> (<em>function</em>) – The function to be called when the button is clicked.</p></li>
<li><p><strong>min</strong> (<em>scalar</em>) – The minimum value of the slider. Default is 0. Not modifiable.</p></li>
<li><p><strong>max</strong> (<em>scalar</em>) – The maximum value of the slider. Default is 1. Not modifiable.</p></li>
<li><p><strong>step</strong> (<em>scalar</em>) – The step size when clicking or dragging. Default is 0.001*(max-min). Not modifiable .</p></li>
<li><p><strong>value</strong> (<em>scalar</em>) – The current value. Can be set by program as well as by user. When a program sets value, the bind function is not executed.</p></li>
<li><p><strong>vertical</strong> (<em>boolean</em>) – If True, slider is vertical. Default is False (horizontal). Not modifiable.</p></li>
<li><p><strong>length</strong> (<em>scalar</em>) – The length of the slider in pixels. Default 400 px. Not modifiable.</p></li>
<li><p><strong>width</strong> (<em>scalar</em>) – The width of the slider in pixels. Default 10 px. Not modifiable.</p></li>
<li><p><strong>left</strong> (<em>scalar</em>) – Margin to the left of slider, in pixels. Default 12 px. Not modifiable.</p></li>
<li><p><strong>right</strong> (<em>scalar</em>) – Margin to the right of slider, in pixels. Default is 12 px. Not modifiable.</p></li>
<li><p><strong>top</strong> (<em>scalar</em>) – Margin above the slider, in pixels. Default is 0 px for horizontal, 8 px for vertical. Not modifiable.</p></li>
<li><p><strong>bottom</strong> (<em>scalar</em>) – Margin below the slider, in pixels. Default is 0 px for horizontal, 8 px for vertical. Not modifiable. Currently does not work properly.</p></li>
<li><p><strong>align</strong> (<em>string</em>) – If ‘left’, slider is displayed at left of window. Options are ‘left’, ‘right’, ‘none’ (the default). Not modifiable.</p></li>
<li><p><strong>pos</strong> (<em>attribute of canvas</em>) – Location of widget. Default is scene.caption_anchor.</p></li>
<li><p><strong>disabled</strong> (<em>boolean</em>) – If True, widget is grayed out and is inactive.</p></li>
<li><p><strong>delete</strong><strong>(</strong><strong>)</strong> – <code class="docutils literal notranslate"><span class="pre">myslider.delete()</span></code> deletes the widget.</p></li>
</ul>
</dd>
</dl>
</dd></dl>
<p>The following code creates a slider with an attribute <em>id</em> that adjusts the length of a cone:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">cc</span> <span class="o">=</span> <span class="n">cone</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">yellow</span><span class="p">,</span> <span class="n">axis</span><span class="o">=</span><span class="n">vec</span><span class="p">(</span><span class="mf">2.5</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="mi">0</span><span class="p">),</span> <span class="n">pos</span><span class="o">=</span><span class="n">vec</span><span class="p">(</span><span class="o">-</span><span class="mi">2</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="mi">0</span><span class="p">)</span> <span class="p">)</span>
<span class="k">def</span> <span class="nf">stretch</span><span class="p">(</span><span class="n">evt</span><span class="p">):</span>
<span class="n">console</span><span class="o">.</span><span class="n">log</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">id</span> <span class="ow">is</span> <span class="s1">'x'</span><span class="p">:</span>
<span class="n">cc</span><span class="o">.</span><span class="n">length</span> <span class="o">=</span> <span class="n">evt</span><span class="o">.</span><span class="n">value</span>
<span class="n">xslider</span> <span class="o">=</span> <span class="n">slider</span><span class="p">(</span><span class="n">bind</span><span class="o">=</span><span class="n">stretch</span><span class="p">,</span> <span class="nb">max</span><span class="o">=</span><span class="mi">5</span><span class="p">,</span> <span class="nb">min</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span> <span class="n">step</span><span class="o">=</span><span class="mf">0.1</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">cc</span><span class="o">.</span><span class="n">length</span><span class="p">,</span> <span class="nb">id</span><span class="o">=</span><span class="s1">'x'</span><span class="p">)</span>
</pre></div>
</div>
<p>Sliders do not have a text field. If you wish to display the current value of a slider, use <a class="reference internal" href="wtext.html"><span class="doc">wtext</span></a>.</p>
<section id="slider-event-attributes">
<h2>Slider Event Attributes<a class="headerlink" href="#slider-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 slider at the time it was clicked):</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">evt.value</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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