[RQt-devel] Timings

[Michael Lawrence]

On Tue, Mar 23, 2010 at 6:15 AM, Hadley Wickham <hadley at rice.edu> wrote:

> Looking at the timings in painter.csv, there are a few suspicious outliers:
>
>  * why does opengl R35 take so much longer to draw than R30 and R5?
>

This is explained in painter.results. We're using a fast path (GL_POINTS) to
draw the circles when we can, but the maximum point radius (on most
hardware) is 32. After that we fall back to a the relatively slow but still
pretty fast midpoint algorithm, which is faster than Qt's tessellating.


>  * what is up with antialiased segments?!
>
>
Might need to be more specific? Software is very slow when drawing
antialiased segments.


> Otherwise the timings look great!
>
> Hadley
>
> --
> Assistant Professor / Dobelman Family Junior Chair
> Department of Statistics / Rice University
> http://had.co.nz/
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