Re: [boost] [svg_plot] Progress of SVG_Plot

From: Jake Voytko (jakevoytko_at_[hidden])
Date: 2007-07-31 14:04:48

On 7/31/07, Lewis Hyatt <lhyatt_at_[hidden]> wrote:
> > This is what I meant when I said that I was having problems. It
> > currently accepts maps, and I didn't change the language in the
> > documentation clear enough. My view on the 1D containers (vector, etc)
> > is that a user will have a single container, and want to plot it in
> > two dimensions, with the index of the data being the X coordinate, and
> > the value stored being the Y value, and the behavior will be changed
> > to reflect that. I will look into your suggestions and see how that
> > affects my program. I'm a little fuzzy on C++ concepts, and I didn't
> > see a way to say that the containers hold pair<,>s.
>
> OK, well I think what you want to do is set up the interface so that,
> instead of expecting a container which provides begin() and end(), you
> expect anything conforming to Boost.Range. (This should not be a major
> change, just some minor syntax adjustments). The other use cases, such
> as passing in a separate vector<> for x and y, or passing in only y and
> having x be auto-generated, are easily adapted to this interface using
> boost::zip_iterator and boost::counting_iterator. You might choose to
> support that directly by providing alternate overloads which do the
> adaptation for the user.

That's a good idea. I'll have to play around with that and see what I
can get out of it.

> I think what seems most natural to me is that
> you can provide two overloads of plot(x), where x can be:
>
> -a Boost.Range with a value_type of std::pair<T,U> (what you have now)
> -a Boost.Range with a value_type of T, in which case you will provide an
> adaptor which auto-generates the x axis from the data indices

This was my original goal. I ran into some last-minute trouble
providing the second interface, but that was certainly the intent. I
had not considered using boost::counting_iterator and
boost::zip_iterator, but I think they'll certainly help.

Thanks,
Jake