You need a GogRenderer. If you don't have one, create it, something
like:
GogRenderer *rend = gog_renderer_new (graph);
gog_renderer_update (rend, allocation->width, allocation->height);
Then you need the GogView for the plot to know it's allocation:
GogView *view;
g_object_get (G_OBJECT (rend), "view", &view, NULL);
view = gog_view_find_child_view (view, chart);
view = gog_view_find_child_view (view, plot);
and you can use the allocation to create the map:
map = gog_chart_map_new (plotpresent->gchart, &(view->allocation),
x_axis, y_axis, NULL, FALSE);
Here, you might test if the map is valid and if the event occurred inside the
plot:
if (gog_chart_map_is_valid (map) &&
event->x >= view->allocation.x && event->x < view->allocation.x +
view->allocation.w &&
event->y >= view->allocation.y && event->y < view->allocation.y +
view->allocation.h) {
x_map = gog_chart_map_get_axis_map (map, 0);
y_map = gog_chart_map_get_axis_map (map, 1);
x = gog_axis_map_from_view (x_map, event->x);
y = gog_axis_map_from_view (y_map, event->y);
}
Le mercredi 20 mai 2009 à 19:06 +0200, Jean Bréfort a écrit :
> I'm not sure how you must do at the moment. I'll have to make some tests
> and time is missing just now. But you surely need to take plot_area.x
> and plot_area.y into account. Anyway this is related to the enhancement
> feature #580545 even it is for an xy plot instead if a pie plot.
> I intend to woekon that quite soon, and I'll let you know how things are
> going.
>
> Best regards,
> Jean
>
> Le mercredi 20 mai 2009 à 09:53 +0100, [email protected] a écrit :
> > Hi all,
> >
> > I'm displaying a chart with libgoffice and I'd like to map motion
> > notify event coordinates to axis positions.
> >
> > I've got fairly close, but I can't see how to take account of the
> > margins around the edges of the chart :-( Can anyone point me to some
> > sample code that does this?
> >
> > Here's what I have:
> >
> > axes = gog_chart_get_axes( plotpresent->gchart, GOG_AXIS_X );
> > x_axis = GOG_AXIS( axes->data );
> > g_slist_free( axes );
> >
> > axes = gog_chart_get_axes( plotpresent->gchart, GOG_AXIS_Y );
> > y_axis = GOG_AXIS( axes->data );
> > g_slist_free( axes );
> >
> > gog_chart_get_plot_area( plotpresent->gchart, &plot_area );
> >
> > map = gog_chart_map_new( plotpresent->gchart,
> > &plot_area, x_axis, y_axis, NULL, FALSE );
> >
> > x_map = gog_chart_map_get_axis_map( map, 0 );
> > y_map = gog_chart_map_get_axis_map( map, 1 );
> >
> > x_canvas = event->x / (double) allocation->width;
> > y_canvas = event->y / (double) allocation->height;
> >
> > x = gog_axis_map_from_view( x_map, x_canvas );
> > y = gog_axis_map_from_view( y_map, y_canvas );
> >
> > gog_chart_map_free( map );
> >
> > printf( "event->x = %g, event->y = %g\n", event->x, event->y );
> > printf( "x_canvas = %g, y_canvas = %g\n", x_canvas, y_canvas );
> > printf( "x = %g, y = %g\n", x, y );
> >
> > John
> > _______________________________________________
> > gnumeric-list mailing list
> > [email protected]
> > http://mail.gnome.org/mailman/listinfo/gnumeric-list
_______________________________________________
gnumeric-list mailing list
[email protected]
http://mail.gnome.org/mailman/listinfo/gnumeric-list
