[cairo] Cairo and animations

[Pietro Incardona]

( Sorry wrong code )

Unfortunately i has changed also to this


 //   for(int k=0; k< 1000; ++j){
            cairo_set_source_rgb (cr, (double)j/1000.0, (double)j/1000.0, 1.0 - (double)j/1000.0);
            cairo_move_to(cr, i,j/2); 
            cairo_line_to(cr, i+100,j/2);
            cairo_stroke(cr);
        }
//    }


and to this

 //   for(int k=0; k< 100; ++j){

            cairo_set_source_rgb (cr, (double)j/1000.0, (double)j/1000.0, 1.0 - (double)j/1000.0);

            cairo_move_to(cr, i,j/2); 

            cairo_line_to(cr, i+100,j/2);

            cairo_stroke(cr);

        }

//    }

but i has 1-2 frame / sec when the window is maximized for me.
i has smooth animation only when the window is very little
( it has no sense, but it is what happen )

----------------------------------------
> Date: Tue, 23 Dec 2008 00:11:40 +0200
> From: jpihlaja at cc.helsinki.fi
> To: asmprog32 at hotmail.com
> CC: cairo at cairographics.org
> Subject: Re: [cairo] Cairo and animations
>
>
> Hi,
>
> On Mon, 22 Dec 2008, Pietro Incardona wrote:
>
>> For now I am not using my code, but your example code here
>> http://www.cairographics.org/threaded_animation_with_cairo/
>> I has downloaded ( and compiled ) the git cairo version
>
> [snip]
>
>> Started the example ./threaded_exampResult: 1 - 2 frame / sec
>
> The threaded example code is very slow on purpose. The point of
> the example is to show how to use threads to separate a slow
> rendering function from other parts of the application.
>
> If you look at the drawing function of the example it'll become
> clear: to make the rendering slow the example renders a linear
> gradient in a silly way (a differently solid coloured stroke for
> each horizontal line of the gradient), and if that wasn't slow
> enough it repeats rendering the same gradient 100x per frame to
> make absolutely sure it crawls. Simply removing the 100x looping
> makes it smooth for me.
>
> Cheers,
>
> Joonas
>

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