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      <a href="http://git.reviewboard.kde.org/r/108992/">http://git.reviewboard.kde.org/r/108992/</a>
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 <pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">ints and other POD types do not need to be pulled from the loops. it just uglifies with no benefit.

moreover, there is a bug that exists in the code which has gone unfixed (noted below)</pre>
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    <a href="http://git.reviewboard.kde.org/r/108992/diff/1/?file=114209#file114209line230" style="color: black; font-weight: bold; text-decoration: underline;">plasma/widgets/signalplotter.cpp</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void SignalPlotter::reorderPlots(const QList<uint>& newOrder)</pre></td>

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    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">    <span class="kt">int</span> <span class="n">newIndex</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">no point in taking PODs out of the loop</pre>
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    <a href="http://git.reviewboard.kde.org/r/108992/diff/1/?file=114209#file114209line231" style="color: black; font-weight: bold; text-decoration: underline;">plasma/widgets/signalplotter.cpp</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void SignalPlotter::reorderPlots(const QList<uint>& newOrder)</pre></td>

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    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">229</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">    <span class="n">foreach</span> <span class="p">(</span><span class="n">QList</span><span class="o"><</span><span class="kt">double</span><span class="o">></span> <span class="n">data</span><span class="p">,</span> <span class="n">d</span><span class="o">-></span><span class="n">plotData</span><span class="p">)</span> <span class="p">{</span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">231</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">    <span class="n">foreach</span> <span class="p">(</span><span class="n">QList</span><span class="o"><</span><span class="kt">double</span><span class="o">></span> <span class="n">data</span><span class="p">,</span> <span class="n">d</span><span class="o">-></span><span class="n">plotData</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">QList<double> &data</pre>
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    <a href="http://git.reviewboard.kde.org/r/108992/diff/1/?file=114209#file114209line231" style="color: black; font-weight: bold; text-decoration: underline;">plasma/widgets/signalplotter.cpp</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void SignalPlotter::reorderPlots(const QList<uint>& newOrder)</pre></td>

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    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">229</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">    <span class="n">foreach</span> <span class="p">(</span><span class="n">QList</span><span class="o"><</span><span class="kt">double</span><span class="o">></span> <span class="n">data</span><span class="p">,</span> <span class="n">d</span><span class="o">-></span><span class="n">plotData</span><span class="p">)</span> <span class="p">{</span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">231</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">    <span class="n">foreach</span> <span class="p">(</span><span class="n">QList</span><span class="o"><</span><span class="kt">double</span><span class="o">></span> <span class="n">data</span><span class="p">,</span> <span class="n">d</span><span class="o">-></span><span class="n">plotData</span><span class="p">)</span> <span class="p">{</span></pre></td>
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    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">230</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="k">if</span> <span class="p">(</span><span class="n">newOrder</span><span class="p">.</span><span class="n">count</span><span class="p">()</span> <span class="o">!=</span> <span class="n">data</span><span class="p">.</span><span class="n">count</span><span class="p">())</span> <span class="p">{</span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">232</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="k">if</span> <span class="p">(</span><span class="n">newOrder</span><span class="p">.</span><span class="n">count</span><span class="p">()</span> <span class="o">!=</span> <span class="n">data</span><span class="p">.</span><span class="n">count</span><span class="p">())</span> <span class="p">{</span></pre></td>
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    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">231</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">            <span class="n">kDebug</span><span class="p">()</span> <span class="o"><<</span> <span class="s">"Serious problem in move sample.  plotdata[i] has "</span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">233</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">            <span class="n">kDebug</span><span class="p">()</span> <span class="o"><<</span> <span class="s">"Serious problem in move sample.  plotdata[i] has "</span></pre></td>
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    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">232</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">                     <span class="o"><<</span> <span class="n">data</span><span class="p">.</span><span class="n">count</span><span class="p">()</span> <span class="o"><<</span> <span class="s">" and neworder has "</span> <span class="o"><<</span> <span class="n">newOrder</span><span class="p">.</span><span class="n">count</span><span class="p">();</span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">234</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">                     <span class="o"><<</span> <span class="n">data</span><span class="p">.</span><span class="n">count</span><span class="p">()</span> <span class="o"><<</span> <span class="s">" and neworder has "</span> <span class="o"><<</span> <span class="n">newOrder</span><span class="p">.</span><span class="n">count</span><span class="p">();</span></pre></td>
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    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">233</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="p">}</span> <span class="k">else</span> <span class="p">{</span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">235</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="p">}</span> <span class="k">else</span> <span class="p">{</span></pre></td>
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    <th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">234</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">            <span class="n"><span class="hl">QList</span></span><span class="o"><span class="hl"><</span></span><span class="kt"><span class="hl">double</span></span><span class="o"><span class="hl">></span></span><span class="hl"> </span><span class="n">newPlot</span><span class="p">;</span></pre></td>
    <th bgcolor="#e9eaa8" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">236</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">            <span class="n">newPlot</span><span class="p"><span class="hl">.</span></span><span class="n"><span class="hl">clear</span></span><span class="p"><span class="hl">()</span>;</span></pre></td>
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    <th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
    <th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">237</font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">            <span class="n">newPlot</span><span class="p">.</span><span class="n">reserve</span><span class="p">(</span><span class="n">newOrder</span><span class="p">.</span><span class="n">count</span><span class="p">());</span></pre></td>
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    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">235</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">            <span class="k">for</span> <span class="p">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="n">i</span> <span class="o"><</span> <span class="n">newOrder</span><span class="p">.</span><span class="n">count</span><span class="p">();</span> <span class="n">i</span><span class="o">++</span><span class="p">)</span> <span class="p">{</span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">238</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">            <span class="k">for</span> <span class="p">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="n">i</span> <span class="o"><</span> <span class="n">newOrder</span><span class="p">.</span><span class="n">count</span><span class="p">();</span> <span class="n">i</span><span class="o">++</span><span class="p">)</span> <span class="p">{</span></pre></td>
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    <th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">236</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">               <span class="hl"> </span><span class="kt"><span class="hl">int</span></span> <span class="n">newIndex</span> <span class="o">=</span> <span class="n">newOrder</span><span class="p">[</span><span class="n">i</span><span class="p">];</span></pre></td>
    <th bgcolor="#e9eaa8" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">239</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">                <span class="n">newIndex</span> <span class="o">=</span> <span class="n">newOrder</span><span class="p">[</span><span class="n">i</span><span class="p">];</span></pre></td>
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    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">237</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">                <span class="n">newPlot</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="n">data</span><span class="p">.</span><span class="n">at</span><span class="p">(</span><span class="n">newIndex</span><span class="p">));</span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">240</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">                <span class="n">newPlot</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="n">data</span><span class="p">.</span><span class="n">at</span><span class="p">(</span><span class="n">newIndex</span><span class="p">));</span></pre></td>
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    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">238</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">            <span class="p">}</span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">241</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">            <span class="p">}</span></pre></td>
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    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">239</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">            <span class="n">data</span> <span class="o">=</span> <span class="n">newPlot</span><span class="p">;</span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">242</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">            <span class="n">data</span> <span class="o">=</span> <span class="n">newPlot</span><span class="p">;</span></pre></td>
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    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">240</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="p">}</span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">243</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="p">}</span></pre></td>
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    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">241</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">    <span class="p">}</span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">244</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">    <span class="p">}</span></pre></td>
  </tr>

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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">er .. this does nothing.

the data member in the foreach loop is a *copy* of the QList<double> from d->plotData. assigning to it just assigns to that copy which only has scope within the foreach.

this *ought* to be:

    QMutableListIterator<QList<double> > it(d->plotData);
    while (it.hasNext()) {
        it.next();
        newPlot.clear();
        newPlot.append(data.at(newIndex));
        it.setValue(newPlot);
    }

</pre>
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    <a href="http://git.reviewboard.kde.org/r/108992/diff/1/?file=114209#file114209line781" style="color: black; font-weight: bold; text-decoration: underline;">plasma/widgets/signalplotter.cpp</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void SignalPlotter::drawTopBarContents(QPainter *p, int x, int width, int height)</pre></td>

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  <tr>
    <th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
    <th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">781</font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="kt">double</span> <span class="n">newest_datapoint</span><span class="p">;</span></pre></td>
  </tr>

  <tr>
    <th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
    <th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">782</font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="kt">int</span> <span class="n">start</span><span class="p">,</span> <span class="n">end</span><span class="p">,</span> <span class="n">start2</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">this is unlikely to have any impact; PODs are cheap and compilers are smart.</pre>
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    <a href="http://git.reviewboard.kde.org/r/108992/diff/1/?file=114209#file114209line784" style="color: black; font-weight: bold; text-decoration: underline;">plasma/widgets/signalplotter.cpp</a>
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     (Diff revision 1)

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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void SignalPlotter::drawTopBarContents(QPainter *p, int x, int width, int height)</pre></td>

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  <tr>
    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">777</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="n">QList</span><span class="o"><</span><span class="kt">double</span><span class="o">></span> <span class="n">newestData</span> <span class="o">=</span> <span class="n">d</span><span class="o">-></span><span class="n">plotData</span><span class="p">.</span><span class="n">first</span><span class="p">();</span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">784</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="n">QList</span><span class="o"><</span><span class="kt">double</span><span class="o">></span> <span class="n">newestData</span> <span class="o">=</span> <span class="n">d</span><span class="o">-></span><span class="n">plotData</span><span class="p">.</span><span class="n">first</span><span class="p">();</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">const QList<double> &?</pre>
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    <a href="http://git.reviewboard.kde.org/r/108992/diff/1/?file=114209#file114209line785" style="color: black; font-weight: bold; text-decoration: underline;">plasma/widgets/signalplotter.cpp</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void SignalPlotter::drawTopBarContents(QPainter *p, int x, int width, int height)</pre></td>

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  <tr>
    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">778</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="k">for</span> <span class="p">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="n">newestData</span><span class="p">.</span><span class="n">count</span><span class="p">()</span><span class="o">-</span><span class="mi">1</span><span class="p">;</span> <span class="n">i</span> <span class="o">>=</span> <span class="mi">0</span><span class="p">;</span> <span class="o">--</span><span class="n">i</span><span class="p">)</span> <span class="p">{</span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">785</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="k">for</span> <span class="p">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="n">newestData</span><span class="p">.</span><span class="n">count</span><span class="p">()</span><span class="o">-</span><span class="mi">1</span><span class="p">;</span> <span class="n">i</span> <span class="o">>=</span> <span class="mi">0</span><span class="p">;</span> <span class="o">--</span><span class="n">i</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">since we're changing things here, how about the rather more readable:

QListIterator<double> it(newestData);
it.toBack();
while (it.hasPrevious()) {
   it.previous();</pre>
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    <a href="http://git.reviewboard.kde.org/r/108992/diff/1/?file=114209#file114209line860" style="color: black; font-weight: bold; text-decoration: underline;">plasma/widgets/signalplotter.cpp</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void SignalPlotter::drawPlots(QPainter *p, int top, int w, int h, int horizontalScale)</pre></td>

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    <th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">852</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
    <th bgcolor="#e9eaa8" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">859</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">    <span class="kt">float</span> <span class="n">x0</span><span class="p">,</span> <span class="n">x1</span><span class="p">,</span> <span class="n">x2</span><span class="p">,</span> <span class="n">x3</span><span class="p">,</span> <span class="n">y0</span><span class="p">,</span> <span class="n">y1</span><span class="p">,</span> <span class="n">y2</span><span class="p">,</span> <span class="n">y3</span><span class="p">;</span></pre></td>
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    <th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
    <th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">860</font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">    <span class="kt">int</span> <span class="n">offset</span><span class="p">;</span></pre></td>
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  <tr>
    <th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
    <th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">861</font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">    <span class="kt">double</span> <span class="n">max_y</span><span class="p">,</span> <span class="n">min_y</span><span class="p">,</span> <span class="n">current_maxvalue</span><span class="p">,</span> <span class="n">current_minvalue</span><span class="p">;</span></pre></td>
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    <th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
    <th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">862</font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">    <span class="kt">float</span> <span class="n">delta_y0</span><span class="p">,</span> <span class="n">delta_y1</span><span class="p">,</span> <span class="n">delta_y2</span><span class="p">,</span> <span class="n">delta_y3</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">this is exceedingly ugly and the PODs should not be incurring much overhead. keeping QList instantiation out of the loops makes sense, but not PODs.</pre>
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    <a href="http://git.reviewboard.kde.org/r/108992/diff/1/?file=114209#file114209line1075" style="color: black; font-weight: bold; text-decoration: underline;">plasma/widgets/signalplotter.cpp</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void SignalPlotter::drawAxisText(QPainter *p, int top, int h)</pre></td>

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    <th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
    <th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1063</font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">    <span class="n">QString</span> <span class="n">number</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">this can probably go (see next comment)</pre>
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    <a href="http://git.reviewboard.kde.org/r/108992/diff/1/?file=114209#file114209line1091" style="color: black; font-weight: bold; text-decoration: underline;">plasma/widgets/signalplotter.cpp</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void SignalPlotter::drawAxisText(QPainter *p, int top, int h)</pre></td>

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    <th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">1071</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">       <span class="hl"> </span><span class="n"><span class="hl">QString</span></span> <span class="n">number</span> <span class="o">=</span> <span class="n">KGlobal</span><span class="o">::</span><span class="n">locale</span><span class="p">()</span><span class="o">-></span><span class="n">formatNumber</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">d</span><span class="o">-></span><span class="n">precision</span><span class="p">);</span></pre></td>
    <th bgcolor="#e9eaa8" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1078</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="n">number</span> <span class="o">=</span> <span class="n">KGlobal</span><span class="o">::</span><span class="n">locale</span><span class="p">()</span><span class="o">-></span><span class="n">formatNumber</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">d</span><span class="o">-></span><span class="n">precision</span><span class="p">);</span></pre></td>
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    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">1072</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="n">val</span> <span class="o">=</span> <span class="n">QString</span><span class="p">(</span><span class="s">"%1 %2"</span><span class="p">).</span><span class="n">arg</span><span class="p">(</span><span class="n">number</span><span class="p">,</span> <span class="n">d</span><span class="o">-></span><span class="n">unit</span><span class="p">);</span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1079</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="n">val</span> <span class="o">=</span> <span class="n">QString</span><span class="p">(</span><span class="s">"%1 %2"</span><span class="p">).</span><span class="n">arg</span><span class="p">(</span><span class="n">number</span><span class="p">,</span> <span class="n">d</span><span class="o">-></span><span class="n">unit</span><span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">why not just avoid the assignment (and the hard to read global instantiation) with:

val = QString("%1 %2").arg(KGlobal::locale()->formatNumber(value, d->precision), d->unit);

i mean, if we're going to ugly it up, let's ugly it up as efficiently as we can ;)</pre>
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    <a href="http://git.reviewboard.kde.org/r/108992/diff/1/?file=114209#file114209line1100" style="color: black; font-weight: bold; text-decoration: underline;">plasma/widgets/signalplotter.cpp</a>
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     (Diff revision 1)

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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void SignalPlotter::drawHorizontalLines(QPainter *p, int top, int w, int h)</pre></td>

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    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">    <span class="kt">int</span> <span class="n">y_coord</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">unlikely to make any difference other than make the code harder to read.</pre>
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<p>- Aaron J.</p>


<br />
<p>On February 17th, 2013, 12:57 p.m. UTC, Raul Fernandes wrote:</p>








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<div>Review request for Plasma.</div>
<div>By Raul Fernandes.</div>


<p style="color: grey;"><i>Updated Feb. 17, 2013, 12:57 p.m.</i></p>






<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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   <pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">- create variables and classes outside the loops
- reserve space in QList if we know already how many items will be added (avoid unnecessary reallocations)
- use const_iterator when possible
- remove a useless call (p->setPen(Qt::NoPen) - it will be set latter before be used)
- avoid multiplications (x3, x2, x1 and x0)</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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   <pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I have tested with KDE 4.10 with no problems.
I have seen a improvement of about 5% in drawPlots() function, the most expensive function in painting.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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 <li>plasma/widgets/signalplotter.cpp <span style="color: grey">(8e9e294)</span></li>

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<p><a href="http://git.reviewboard.kde.org/r/108992/diff/" style="margin-left: 3em;">View Diff</a></p>







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