Re: [Scigraphica-devel] Important additions/changes

[Adrian F. <fe...@ma...>]

On Fri, 28 Sep 2001, Conrad Steenberg wrote:

> On Wed, 26 Sep 2001, Adrian Feiguin wrote:
>
> > Hi,
> >  I've been quite for a while, but I was actually working hard on new
> > developments:
> >  I added a new functionality to gtkplotdata, you can create a
> > gtk_plot_data_iterator, which basically has a callback that retrieves the
> > values of the datapoints.
> >  typedef void    (*GtkPlotIterator)      (GtkPlot *plot,
> >                                          GtkPlotData *data,
> >                                          gint iter,
> >                                          gdouble *x,
> >                                          gdouble *y,
> >                                          gdouble *z,
> >                                          gdouble *a,
> >                                          gdouble *dx,
> >                                          gdouble *dy,
> >                                          gdouble *dz,
> >                                          gdouble *da,
> >                                          gchar **label,
> >                                          gboolean *error);
> >
> >  I changed the model in SG to use this new feature as follows: the
> > datasets don't store the points internally anymore: they read directly
> > from the worksheet every time they are refreshed (I added a "Refresh"
> > button in the plot window). This saves a lot of memory, and you don't need
> > to save the datasets points in the files.
> >
> >  On the other hand, when you create a dataset, this is kept in an internal
> > list and shared by all the layers/plots. When you add a dataset to a given
> > layer, you are actually adding a CLONE of it, generated using
> > sg_dataset_clone. The clone is linked to the original dataset using
> > data->real_data->link. The original dataset is linked to itself. the clone
> > can have its own attributes (symbol, lines, legends) independently of the
> > parent.
>
> Just a quick question: so to get the data, I do:
>
> my_iterator=(GtkPlotIterator*)data->real_data->link;
> my_iterator(myplot,myplot_data,??,&x,&y,&z,&a,&dx,&dy,&dz,&da,&labels,&error);
>
> Where do I get the iter parameter?
>
> Cheers!
>
> Conrad

No , it's like this:
  iterator = (GtkPlotIterator *)data->real_data->iterator.
  Anyway, the right way is downloading the latest CVS, and using

  gtk_plot_data_get_point(dataset->real_data, point_i,
			  &x, &y, ...);

Where point_i goes from 0 to data->real_data->num_points-1.

Does it help?
Saludos,
<ADRIAN>