Re: gnome-canvas search item set with bounding box

[zucchi zedzone mmc com au (NotZed)]

If this is to be done, i might suggest it uses a glist
instead of a bounded array, which will just unecessarily
limit the number of items selectable.

 Michael

> I need function that select items in canvas widget with bounding box.
> like follow this.
> 
> /**
>  * gnome_canvas_get_items_at:
>  * @canvas: A canvas.
>  * @x1: X1 position in world coordinates.
>  * @y1: Y1 position in world coordinates.
>  * @x2: X2 position in world coordinates.
>  * @y2: Y2 position in world coordinates.
>  * @set: found canvas items vector
>  * @max: size of vector(get maximum items)
>  *
>  * Looks for the item sets that is in bounding box, which must be
>  * specified in world coordinates.
>  *
>  * Return value: number of find items ;
>  **/
> 
> gint gnome_canvas_get_items_at(GnomeCanvas *canvas, double x1, double
> y1, double x2, double y2,GnomeCanvasItem** set,gint max)
> {
>   int ret;
>   GnomeCanvasGroup * group;
>   GList *node;
>   GnomeCanvasItem* item;
>   double ix1,ix2,iy1,iy2;
> 
>   g_return_val_if_fail (canvas != NULL, -1);
>   g_return_val_if_fail (GNOME_IS_CANVAS (canvas),-1);
> 
>   group = gnome_canvas_root (canvas);
>   ret = -1;
>   --max;
>   for (node = group->item_list; node; node = node->next){
>     item = (GnomeCanvasItem*)node->data;
>     gnome_canvas_item_get_bounds(item,&ix1,&iy1,&ix2,&iy2);
>     if ((x1 <= ix1)&&(ix1 <= x2)&&(x1 <= ix2)&&(ix2 <= x2)&&
>  (y1 <= iy1)&&(iy1 <= y2)&&(y1 <= iy2)&&(iy2 <= y2)){
>       ++ret;
>       set[ret] = item;
>       if (ret == max) {
>  break;
>       }
>     }
>   }
>   ++ret;
>   return ret;
> }
> 
> --
> ##########################################
> #NEC Informatech Systems
> #Advanced Technical Systems 1st
> #TANGE Toshio
> 
> 
> 
> 
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