int w=50;//line with, 2*radius
void draw_dot(int x, int y)
{
cairo_set_line_width (cr, w);
cairo_set_line_cap (cr, *CAIRO_LINE_CAP_ROUND*); /* Round dot*/
cairo_move_to (cr, x, y); cairo_line_to (cr, x, y);/* a very short line is a
dot */
cairo_stroke (cr);
}
I tried this, it works for me.
it 'looks' simpler, but not sure what's happening underneath(the
performance depends on how cario implements ), may this run faster ?
This is just my guess.
Cheers
P
On Fri, May 8, 2009 at 12:43 PM, Dancefire <[email protected]> wrote:
> Hi,
>
> I know how to draw line, arc(circle) in cairo. however, I cannot find the
> efficient way to draw a simple round dot. I tried arc(), it works, however,
> it is very slow. I need draw thousands of the small dot with different
> radius. arc() is a little bit slow to do that.
>
> I also tried draw a rectangle with round cap, round join and 0 width and
> height. It works and seems faster than arc(). But I may in the wrong track.
>
> Could anyone point me out, how to draw a lot of dot with different radius
> efficiently? Thanks.
>
> --
> Tao Wang
> Microsoft Certified Technology Specialist
> CCNA
>
> _______________________________________________
> gtkmm-list mailing list
> [email protected]
> http://mail.gnome.org/mailman/listinfo/gtkmm-list
>
>
_______________________________________________
gtkmm-list mailing list
[email protected]
http://mail.gnome.org/mailman/listinfo/gtkmm-list
