Hello colleague,
On Friday, February 28, 2014 6:59:13 AM UTC+1, Roger Herikstad wrote:
>
> Hi all,
> I tried to get a better understanding of Cairo drawing by implementing
> this solution myself. This is just a proof-of-concept and I didn't do any
> rigorous testing, but subjectively comparing the resize performance of a
> Winston scatter plot of ~10000 points and this new solution, I noticed a
> significant speed-up. Note that I still find it too slow, but that's
> probably due to my lack of understanding of Cairo.
> Basically, this is what I did:
> I appreciate any comments on this. Thanks!
>
1)
How do you plan to treat different colors per dot?
2)
In a lot of cairo advices, the fastest way for a round dot is:
set_line_cap(cr,Cairo.CAIRO_LINE_CAP_ROUND)
set_line_width(cr,radius)
for i=1:n
move_to(cr,px[i],py[i]);
rel_line_to(cr,0,0);
stroke(cr);
end
so setting the line end to a ROUND CAP and plot a line of length 0.
