Re: handling multiple graph using gtkplot in gtk application [Please HELP]

Hi Shupa,

Sorry I didn't get back to you earlier, I am trying to catch up with my 
backlog. At firt glance, I don't see anything wrong with your code, and 
I don't think your problem is related to gtkextra. It looks to me as 
though you are trying to add a canvas to a viewport which already 
contains a child widget. A viewport is a gtkbin, which can contain a 
single child. You have to remove the old child if you want to add a new 
one. You can use testgtkplot and sg_plot_window in scigraphica as nice 
self-explanatory examples.

Sorry again for taking so long to reply, I hope this helps, or you've 
solved your problems.
Saludos,
<ADRIAN>


shuprabha shakya wrote:

> Hi,
>
> My application needs to plot different graphs as selected by user. 
> Here user select graph type in combo and correspnding graph has to be 
> plotted.
>
> I am using gtkextra-2.0 widget, gtkplot and gtkcanvas for plotting 
> within gtk application in C. I am using liblglade to compile the glade 
> files made from glade.
>
> Here, I am trying to plot the graph in a viewport. [I wonder whether, 
> this idea is correct or not / gtkextra is supported in gtk application 
> or not]
>
> Taking help of the gtk-extra code, I was able to draw  a plot in 
> viewport. But every, I again try to plot in the view port again it 
> gives me following error.
>
> (<unknown>:8762): Gtk-CRITICAL **: gtk_viewport_add: assertion 
> `bin->child == NULL' failed
>
> Then, I tried to set the viewport to NULL, which gave me this error:
>
> (<unknown>:8247): Gtk-CRITICAL **: gtk_container_add: assertion 
> `GTK_IS_CONTAINER (container)' failed
>
> I wonder what could be the possible reasons?
> Is there any function that can clear the viewport once it is drawn?
> Does gtk application can integrate gtkextra package in this way?
> Does the gtkplot wodget can be shown in pallete window of glade?
> Is there any other solution?
>
> Below is my graph plotting code which i call when user select any 
> graph and click display button. The draw_graph_function() is called 
> every time user selects the graph type.
>
> //------------------------------------------------------------------------------------------------------
>
> void draw_graph_function()
> {
>     GtkWidget * widget;
>     GtkWidget * activePlot;
>     GtkWidget *canvas;
>     gint id;
>     GtkPlotCanvasChild *child;
>    
>     id = get_id_for_graph();  // get which graph has to be plotted
>    
>     /* canvas */
>     canvas = gtk_plot_canvas_new(420, 350, 1.0);
>     GTK_PLOT_CANVAS_UNSET_FLAGS(GTK_PLOT_CANVAS(canvas),          
> GTK_PLOT_CANVAS_DND_FLAGS);
>     gtk_container_add(GTK_CONTAINER(plot_view), canvas);  // plot_view 
> is //pointer to view port read as
> //plot_view = glade_xml_get_widget(xml,"plot_viewport");
>     gtk_widget_show(canvas);
>    
>     activePlot=GTK_WIDGET(get_plot_outline());   // 
> get_plot_outline()sets the x, y axis ticks
>     set_plot_for_graph(GTK_PLOT(activePlot));
>    
>     /* canvas plot */
>     child = gtk_plot_canvas_plot_new(GTK_PLOT(activePlot));
>     gtk_plot_canvas_put_child(GTK_PLOT_CANVAS(canvas), child, 0.15, 
> 0.15, 0.85, 0.85);
>     gtk_widget_show(GTK_WIDGET(activePlot));   
>    
>     build_plot(GTK_PLOT(activePlot));        // sets dataset
>        
>     gtk_plot_canvas_paint(GTK_PLOT_CANVAS(canvas));
>     gtk_plot_canvas_refresh(GTK_PLOT_CANVAS(canvas));
>    
> }
>
> GtkPlot *
> get_plot_outline()
> {
>     GtkPlot *plot;
>     gint id;
>    
>     id = get_id_for_graph();
>    
>     /* plot */
>     switch(id)
>     {
>         case 0:
>                 plot = GTK_PLOT(gtk_plot_new(NULL));
>                 gtk_plot_set_range(plot, 0., 1.5, 0., 1.5);
>                 gtk_plot_set_ticks(plot, GTK_PLOT_AXIS_X, 0.5, 2);
>                 gtk_plot_set_ticks(plot, GTK_PLOT_AXIS_Y, 0.5, 2);
>                 gtk_plot_axis_hide_title(gtk_plot_get_axis(plot, 
> GTK_PLOT_AXIS_TOP));
>                 gtk_plot_axis_hide_title(gtk_plot_get_axis(plot, 
> GTK_PLOT_AXIS_RIGHT));
>                 gtk_plot_axis_set_title(gtk_plot_get_axis(plot, 
> GTK_PLOT_AXIS_BOTTOM), "x");
>                 gtk_plot_axis_set_title(gtk_plot_get_axis(plot, 
> GTK_PLOT_AXIS_LEFT), "y");
>                 gtk_plot_hide_legends(plot);
>                 break;
>        
>         case 1:
>                 plot = GTK_PLOT(gtk_plot_new(NULL));
>                 gtk_plot_set_range(plot, 0., 2, 0., 2);
>                 gtk_plot_set_ticks(plot, GTK_PLOT_AXIS_X, 0.5, 2);
>                 gtk_plot_set_ticks(plot, GTK_PLOT_AXIS_Y, 0.5, 2);
>                 gtk_plot_axis_hide_title(gtk_plot_get_axis(plot, 
> GTK_PLOT_AXIS_TOP));
>                 gtk_plot_axis_hide_title(gtk_plot_get_axis(plot, 
> GTK_PLOT_AXIS_RIGHT));
>                 gtk_plot_axis_set_title(gtk_plot_get_axis(plot, 
> GTK_PLOT_AXIS_BOTTOM), "x1");
>                 gtk_plot_axis_set_title(gtk_plot_get_axis(plot, 
> GTK_PLOT_AXIS_LEFT), "y1");
>                 gtk_plot_hide_legends(plot);
>                 break;
>        
>         default:
>                 printf("Invalid ID - get plot outline - %d\n", id);
>     }
>     return plot;  
> }
>
> void
> build_plot(GtkPlot * plot)
> {
>     GtkPlotData *dataset;
>     printf("build plot");
>     //gdouble px[NPOINTS];
>     //gdouble py[NPOINTS];
>     static gdouble px1[6], py1[6];
>    
>     gint i, id;
>    
>     id = get_id_for_graph();
>    
>     switch(id)
>     {
>     case 0:
>    
>             for(i=0; i<6;i++)
>             {
>             px1[i] = i*0.2;
>             py1[i] = px1[i];
>             }
>        
>             dataset = GTK_PLOT_DATA(gtk_plot_data_new());
>              gtk_plot_add_data(GTK_PLOT(plot), dataset);
>              gtk_widget_show(GTK_WIDGET(dataset));
>              gtk_plot_data_set_points(dataset, px1, py1, NULL, NULL, 6);
>              break;
>             
>     case 1:
>    
>             for(i=0; i<8;i++)
>             {
>             px1[i] = i*0.2;
>             py1[i] = px1[i];
>             }
>        
>             dataset = GTK_PLOT_DATA(gtk_plot_data_new());
>              gtk_plot_add_data(GTK_PLOT(plot), dataset);
>              gtk_widget_show(GTK_WIDGET(dataset));
>              gtk_plot_data_set_points(dataset, px1, py1, NULL, NULL, 8);
>              break;
>    
>     default:
>             printf("Invalid ID - build plot - %d\n", id);
>     }
> }
> //------------------------------------------------------------------------------------------------------
>
>
>
>
>
>
> shupa
>
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