gnome-canvas search item set with bounding box

[TANGE Toshio <t-tange ats nis nec co jp>]

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;
}

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#NEC Informatech Systems
#Advanced Technical Systems 1st
#TANGE Toshio