Regards,
Dov
2008/5/15 Diego A. Fons <diegofons@xxxxxxxxxx>:
Paul Davis wrote:So you are saying I create the Cairo context in the expose event and
> On Thu, 2008-05-15 at 12:05 -0300, Diego A. Fons wrote:
>
>
>> Like Theodore I'm using gtkmm. This is an extrac of the code which
>> doesn't work:
>> void Plotter::on_realize( void )
>> {
>> // Create the GDK window
>> refGdkWindow = Gdk::Window::create(get_window(), &attributes,
>> GDK_WA_X | GDK_WA_Y);
>>
>> // Create Cairo context
>> Cairo::RefPtr<Cairo::Context> cr = refGdkWindow->create_cairo_context();
>> }
>>
>
> you're all thinking too hard. Cairo drawing contexts are supposed to be
> created as necessary. They are cheap. Don't try to cache them. Create
> them in an expose handler and get rid of them.
>
> my attitude towards Cairo is to assume that its been handcoded in SSE9
> assembler unless i come across particular hotspots.
>
>
>
don't care about performance of redrawing the whole plot? OK, I'm trying
that. I'm also going to try the image buffer approach, it is, drawing in
a buffer as a member variable and write the buffer's content to the
Cairo context in the expose event.
Still I don't understand why can't get a context and store it in a
member variable.
Regards,
Diego A. Fons.
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