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<h1 id="scale-transformation-service">Scale Transformation Service</h1>
<p>The Scale Transformation Service is a an easy to handle tool that can help you with the discretization of number inputs.
It transforms a given input by matching it to specified ranges.
The input string must be in numerical format.</p>
<p>The file is expected to exist in the <code class="highlighter-rouge">transform</code> configuration directory and its ending has to be <code class="highlighter-rouge">.scale</code>.
It should follow the format given in the table below.</p>
<p>Range expressions always contain two parts.
The range to scale on, which is located left from the equality sign and the corresponding output string on the right of it.
A range consists of two bounds. Both are optional, the range is then open. Both bounds can be inclusive or exclusive.</p>
<table>
<thead>
<tr>
<th>Scale Expression</th>
<th>Returns XYZ when the given value is</th>
</tr>
</thead>
<tbody>
<tr>
<td><code class="highlighter-rouge">[12..23]=XYZ</code></td>
<td><code class="highlighter-rouge">between (or equal to) 12 and 23</code></td>
</tr>
<tr>
<td><code class="highlighter-rouge">]12..23[=XYZ</code></td>
<td><code class="highlighter-rouge">between 12 and 23 (12 and 23 are excluded in this case.)</code></td>
</tr>
<tr>
<td><code class="highlighter-rouge">[..23]=XYZ</code></td>
<td><code class="highlighter-rouge">lower than or equal to 23</code></td>
</tr>
<tr>
<td><code class="highlighter-rouge">]12..]=XYZ</code></td>
<td><code class="highlighter-rouge">greater than 12</code></td>
</tr>
</tbody>
</table>
<p>These expressions are evaluated from top to bottom.
The first range that includes the value is selected.</p>
<h2 id="example">Example</h2>
<p>The following example shows how to break down numeric UV values into fixed UV index categories.
We have an example UV sensor that sends numeric values from <code class="highlighter-rouge">0</code> to <code class="highlighter-rouge">100</code>, which we then want to scale into the <a href="https://en.wikipedia.org/wiki/Ultraviolet_index">UV Index</a> range.</p>
<p>Example item:</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">Number</span> <span class="n">Uv_Sensor_Level</span> <span class="s">"UV Level [SCALE(uvindex.scale):%s]"</span>
</code></pre></div></div>
<p>Referenced scale file <code class="highlighter-rouge">uvindex.scale</code> in the <code class="highlighter-rouge">transform</code> folder:</p>
<div class="language-python highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="p">[</span><span class="o">..</span><span class="mi">3</span><span class="p">]</span><span class="o">=</span><span class="mi">1</span>
<span class="p">]</span><span class="mf">3.</span><span class="o">.</span><span class="mi">6</span><span class="p">]</span><span class="o">=</span><span class="mi">2</span>
<span class="p">]</span><span class="mf">6.</span><span class="o">.</span><span class="mi">8</span><span class="p">]</span><span class="o">=</span><span class="mi">3</span>
<span class="p">]</span><span class="mf">8.</span><span class="o">.</span><span class="mi">10</span><span class="p">]</span><span class="o">=</span><span class="mi">4</span>
<span class="p">[</span><span class="mf">10.</span><span class="o">.</span><span class="mi">100</span><span class="p">]</span><span class="o">=</span><span class="mi">5</span>
</code></pre></div></div>
<p>Each value the item receives, will be categorized to one of the five given ranges.
Values <strong>lower than or equal to 3</strong> are matched with <code class="highlighter-rouge">[..3]=1</code>.
Greater values are catched in ranges with 2 values as criteria.
The only condition here is that the received value has to be lower or equal than <code class="highlighter-rouge">100</code> in our example, since we haven’
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