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, jcup...@gmail.com 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 > gnumeric-list@gnome.org > http://mail.gnome.org/mailman/listinfo/gnumeric-list _______________________________________________ gnumeric-list mailing list gnumeric-list@gnome.org http://mail.gnome.org/mailman/listinfo/gnumeric-list
