Re: libgoffice help

[Jean Bréfort <jean brefort normalesup org>]

Le jeudi 30 avril 2009 à 15:46 +0100, jcupitt gmail com a écrit :
> 2009/4/30 Jean Bréfort <jean brefort normalesup org>:
> > You should call gog_object_request_update instead of
> > gog_styled_object_style_changed.
>
> Hi Jean, thank you for the reply, but I still don't get a red line :-(

Yes, sorry, I missed the obvious, what you need is:
  style = gog_styled_object_get_style (GOG_STYLED_OBJECT (series));
  style->line.color = RGBA_RED;
  style->line.auto_color = FALSE;

There is no need in this case to call gog_object_request_update. But you
need to use RGBA_RED instead of RGB_RED and set auto_color to FALSE.


> I made a tiny example program:
>
> -------------
> /* Compile with:
>
>         gcc -g -Wall try156.c `pkg-config libgoffice-0.8 --cflags --libs`
>
>  */
>
> #include <gtk/gtk.h>
>
> #include <goffice/goffice.h>
>
> #include <goffice/app/go-plugin.h>
> #include <goffice/app/go-plugin-loader-module.h>
>
> #include <goffice/data/go-data-simple.h>
>
> #include <goffice/graph/gog-data-set.h>
> #include <goffice/graph/gog-label.h>
> #include <goffice/graph/gog-object.h>
> #include <goffice/graph/gog-plot.h>
> #include <goffice/graph/gog-series.h>
> #include <goffice/graph/gog-style.h>
>
> #include <goffice/gtk/go-graph-widget.h>
>
> #include <goffice/utils/go-color.h>
>
> static double xes[] = { 1.0, 2.0, 3.0 };
> static double yes[] = { 1.0, 12.0, 5.0 };
>
> int
> main (int argc, char **argv)
> {
>   GtkWidget *window;
>
>   GtkWidget *graph;
>   GogChart *chart;
>   GogPlot *plot;
>   GogSeries *series;
>   GOData *data;
>   GError *error;
>   GogStyle *style;
>
>   gtk_init (&argc, &argv);
>
>   libgoffice_init ();
>   go_plugins_init (NULL, NULL, NULL, NULL, TRUE,
>                    GO_PLUGIN_LOADER_MODULE_TYPE);
>
>   window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
>
>   graph = go_graph_widget_new (NULL);
>   gtk_container_add (GTK_CONTAINER (window), graph);
>
>   chart = go_graph_widget_get_chart (GO_GRAPH_WIDGET (graph));
>
>   plot = gog_plot_new_by_name ("GogXYPlot");
>   gog_object_add_by_name (GOG_OBJECT (chart), "Plot", GOG_OBJECT (plot));
>
>   series = gog_plot_new_series (plot);
>   data = go_data_vector_val_new (xes, 3, NULL);
>   gog_series_set_dim (series, 0, data, &error);
>   data = go_data_vector_val_new (yes, 3, NULL);
>   gog_series_set_dim (series, 1, data, &error);
>
>   style = gog_styled_object_get_style (GOG_STYLED_OBJECT (series));
>   style->line.color = RGB_RED;
>   gog_object_request_update (GOG_OBJECT (series));
>
>   gtk_widget_show_all (window);
>
>   gtk_main ();
>
>   return 0;
> }
> ---------------------
>
> What's the best way to make the line red?
>
> My motivation: this is for displaying image profiles, so I need to
> display three series as a line graph, and they need to be red, green,
> blue.
>
> John
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