Re: canvas

[Martin Oberzalek <oberzalek chello at>]

On Wed, Feb 02, 2000 at 02:33:54PM +0100, Jens Finke wrote:
> On Wed, 2 Feb 2000, Martin Oberzalek wrote:
> > After moving a GnomeCanvasItem the item will never be shown.
> > I tried gnome_canvas_update_now( canvas );
> > 	gnome_canvas_item_raise_to_top( item );
> > 	gtk_widget_draw( canvas );
> 
> Can you give more details? For me gnome_canvas_item_move() works perfect.
> Normally you don't have to call any update function. 

have a look at this example:
------------------------------
#include <gnome.h>

GtkWidget *canvas;
GnomeCanvasItem *item, *bg;

int x=0;

int timefunc( gpointer data)
{
  x = x + 10;

  gnome_canvas_item_move( item, x, 100 );

  return TRUE;
}

int main( int argc, char *argv[] )
{
   GtkWidget *window;

   gnome_init( "test", "0.1", argc, argv );
 
   window = gnome_app_new("beepball", _("BeepBall"));
   gtk_window_set_policy( GTK_WINDOW( window ), FALSE, FALSE, TRUE );
   gtk_widget_show( window );

   canvas = gnome_canvas_new();
   gnome_app_set_contents(GNOME_APP( window ), canvas );
   gtk_widget_show( canvas );

   gtk_widget_set_usize(window, 200, 200);
   gnome_canvas_set_scroll_region( GNOME_CANVAS(canvas), 
                                   0.0, 0.0, 
				   200, 
				   200);
										   bg = gnome_canvas_item_new( gnome_canvas_root( GNOME_CANVAS(canvas)),
					gnome_canvas_rect_get_type(),
					"x1", (double) 0,
					"y1", (double) 0,
					"x2", (double) 200,
					"y2", (double) 200,
					"fill_color", "black",
					"outline_color", "black"
					"width_units", 1.0,
					NULL);
					
   item = gnome_canvas_item_new( gnome_canvas_root( GNOME_CANVAS(canvas)),
                                 gnome_canvas_rect_get_type(),
				 "x1", (double) 0,
		                 "y1", (double) 100,
				 "x2", (double) 40,
				 "y2", (double) 110,
				 "fill_color", "red",
				 "outline_color", "green"
				 "width_units", 1.0,
				 NULL);
				 
  gtk_timeout_add( 800, timefunc, NULL ); 
  
  gtk_main();
  
  return 0;
}
-----------------------------						

I'm sure that I missed doing something important.
But what?

-- 

Gruß King Leo

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