[Interest] efficient drawing advice

[william.crocker at analog.com]

On 03/26/2014 10:04 AM, André Somers wrote:
> william.crocker at analog.com schreef op 26-3-2014 14:56:
>>> I too have a similar requirements for monotonic data plots. How do you
>>> store the full million points data?
>> QVector<double>  x, y;
> Is that really the quickest? This means that points have to be fetched
> from two different memory locations all the time. Wouldn't something
> like QVector<QPointF>  perform better? Also, if your x's are regular,
> there is no need to store them of course...
>

Yes, QVector<QPointF> would be better in some circumstances.
But, sometimes I have this: QVector<double> x, y1, y2, y3;
And my x's are irregular.
And fetching from two different memory locations is the
least of my worries.  :-)

Bill

> André
>
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