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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/108992/">http://git.reviewboard.kde.org/r/108992/</a>
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<p style="margin-top: 0;">On February 22nd, 2013, 1:32 a.m. UTC, <b>Aaron J. Seigo</b> wrote:</p>
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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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(Diff revision 1)
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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="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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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Actually, the benefit exists in PODs too (the compiler has to adjust the stack each iteration) but is minor. I agree.
I don't agree that it uglifies the code or make it less readable.
To me, it doesn't make any difference to readability and has the (little) gain in performance. My opinion.
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<p style="margin-top: 0;">On February 22nd, 2013, 1:32 a.m. UTC, <b>Aaron J. Seigo</b> wrote:</p>
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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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(Diff revision 1)
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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="#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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<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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<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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<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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<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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<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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<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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<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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<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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<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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<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>
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<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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<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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<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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<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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<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>
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<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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<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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<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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<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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<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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<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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<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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<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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<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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<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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<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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<pre style="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);
}
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Sorry but you are wrong in one point.
Creating the classe inside the loop leads the compiler to create the object, make the copy and destroy the object in each iteration.
With my patch, it only makes the copy.
I have saw the constructors and destructors in profiler. After the patch, they disappear.
I think there are something wrong with the code too.
The data variable will only be a copy and the statement:
data = newPlot;
will not change the actual list.
I think the code should be (using your suggestion):
QList<double> newPlot;
QList<double> data;
int newIndex;
QMutableListIterator<QList<double> > it(d->plotData);
while (it.hasNext()) {
data = it.next();
if (newOrder.count() != data.count()) {
kDebug() << "Serious problem in move sample. plotdata[i] has "
<< data.count() << " and neworder has " << newOrder.count();
} else {
newPlot.clear();
newPlot.reserve(newOrder.count());
for (int i = 0; i < newOrder.count(); i++) {
newIndex = newOrder[i];
newPlot.append(data.at(newIndex));
}
it.setValue(newPlot);
}
}
Maybe creating data as const reference (const QList<double> data = it.next()) will avoid the copy and the constructor and destructor.
I will test it.</pre>
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<p style="margin-top: 0;">On February 22nd, 2013, 1:32 a.m. UTC, <b>Aaron J. Seigo</b> wrote:</p>
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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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<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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<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="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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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">The idea is good but the problem is the data will be changed latter in the code.</pre>
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<p style="margin-top: 0;">On February 22nd, 2013, 1:32 a.m. UTC, <b>Aaron J. Seigo</b> wrote:</p>
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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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<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>
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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">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="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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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I agree that the impact is minor, but if we educate the coders to always declare variables outside the loops the code will always be better and faster.</pre>
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<p style="margin-top: 0;">On February 22nd, 2013, 1:32 a.m. UTC, <b>Aaron J. Seigo</b> wrote:</p>
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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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<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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<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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<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="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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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Good point. I didn't see that.</pre>
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<p style="margin-top: 0;">On February 22nd, 2013, 1:32 a.m. UTC, <b>Aaron J. Seigo</b> wrote:</p>
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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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<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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<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="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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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">It can't be done as is.
The variable i will be used latter (d->plotColors[i].darkColor), so we have to use it.</pre>
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<p style="margin-top: 0;">On February 22nd, 2013, 1:32 a.m. UTC, <b>Aaron J. Seigo</b> wrote:</p>
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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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<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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<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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<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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<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="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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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">The gain is minimal but I think it is valid to educate the coders to always declare variables outside the loops.
It is a good practice. Do you agree?</pre>
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<p style="margin-top: 0;">On February 22nd, 2013, 1:32 a.m. UTC, <b>Aaron J. Seigo</b> wrote:</p>
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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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<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="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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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Good point.</pre>
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<p style="margin-top: 0;">On February 22nd, 2013, 1:32 a.m. UTC, <b>Aaron J. Seigo</b> wrote:</p>
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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>
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<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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<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="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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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Putting KGlobal::locale... in a new line will make more readable.</pre>
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<p style="margin-top: 0;">On February 22nd, 2013, 1:32 a.m. UTC, <b>Aaron J. Seigo</b> wrote:</p>
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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; "> <span class="kt">int</span> <span class="n">y_coord</span><span class="p">;</span></pre></td>
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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;">unlikely to make any difference other than make the code harder to read.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Again, the benefit is minimal but educate the coders to always declare variables outside loops.
Really, I don't see any ugliness. Maybe because I used to code this way.</pre>
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<p>- Raul</p>
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<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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