Пример #1
0
/*! \brief Check if a bounding box is visible on the screen.
 *  \par Function Description
 *  This function checks if a given bounding box is visible on the screen.
 *
 *  WARNING: top and bottom are mis-named in world-coords,
 *  top is the smallest "y" value, and bottom is the largest.
 *  Be careful! This doesn't correspond to what you'd expect.
 *
 *  \param [in] w_current  The GSCHEM_TOPLEVEL object.
 *  \param [in] wleft      Left coordinate of the bounding box.
 *  \param [in] wtop       Top coordinate of the bounding box.
 *  \param [in] wright     Right coordinate of the bounding box.
 *  \param [in] wbottom    Bottom coordinate of the bounding box.
 *  \return TRUE if bounding box is visible, FALSE otherwise
 */
int visible (GSCHEM_TOPLEVEL *w_current,
             int wleft, int wtop, int wright, int wbottom)
{
  int visible=FALSE;

  /* don't do object clipping if this is false */
  if (!w_current->toplevel->object_clipping) {
    return(TRUE);
  }

  visible = clip_nochange (w_current, wleft, wtop, wright, wtop);

#if DEBUG
  printf("vis1 %d\n", visible);
#endif

  if (!visible) {
    visible = clip_nochange (w_current, wleft, wbottom, wright, wbottom);
  } else {
    return(visible);
  }

#if DEBUG
  printf("vis2 %d\n", visible);
#endif

  if (!visible) {
    visible = clip_nochange (w_current, wleft, wtop, wleft, wbottom);
  } else {
    return(visible);
  }

#if DEBUG
  printf("vis3 %d\n", visible);
#endif

  if (!visible) {
    visible = clip_nochange (w_current, wright, wtop, wright, wbottom);
  } else {
    return(visible);
  }

#if DEBUG
  printf("vis4 %d\n", visible);
#endif

#if DEBUG
  printf("%d %d %d\n", wleft, w_current->toplevel->page_current->top, wright);
  printf("%d %d %d\n", wtop, w_current->toplevel->page_current->top, wbottom);
  printf("%d %d %d\n", wleft, w_current->toplevel->page_current->right, wright);
  printf("%d %d %d\n", wtop, w_current->toplevel->page_current->bottom, wbottom);
#endif

  /*
   * now check to see if bounding box encompasses the entire viewport.
   * We only need to test if one point on the screen clipping boundary
   * is indide the bounding box of the object.
   */
  if (w_current->toplevel->page_current->left >= wleft  &&
      w_current->toplevel->page_current->left <= wright &&
      w_current->toplevel->page_current->top >= wtop    &&
      w_current->toplevel->page_current->top <= wbottom ) {
    visible = 1;
  }

#if DEBUG
  printf("vis5 %d\n", visible);
#endif

  return(visible);
}
Пример #2
0
/*! \brief Check if a bounding box is visible on the screen.
 *  \par Function Description
 *  This function checks if a given bounding box is visible on the screen.
 *
 *  WARNING: top and bottom are mis-named in world-coords,
 *  top is the smallest "y" value, and bottom is the largest.
 *  Be careful! This doesn't correspond to what you'd expect.
 *
 *  \param [in] w_current  The GschemToplevel object.
 *  \param [in] wleft      Left coordinate of the bounding box.
 *  \param [in] wtop       Top coordinate of the bounding box.
 *  \param [in] wright     Right coordinate of the bounding box.
 *  \param [in] wbottom    Bottom coordinate of the bounding box.
 *  \return TRUE if bounding box is visible, FALSE otherwise
 */
int visible (GschemToplevel *w_current,
             int wleft, int wtop, int wright, int wbottom)
{
  int visible=FALSE;
  GschemPageGeometry *geometry = gschem_page_view_get_page_geometry (gschem_toplevel_get_current_page_view (w_current));

  visible = clip_nochange (geometry, wleft, wtop, wright, wtop);

#if DEBUG
  printf("vis1 %d\n", visible);
#endif

  if (!visible) {
    visible = clip_nochange (geometry, wleft, wbottom, wright, wbottom);
  } else {
    return(visible);
  }

#if DEBUG
  printf("vis2 %d\n", visible);
#endif

  if (!visible) {
    visible = clip_nochange (geometry, wleft, wtop, wleft, wbottom);
  } else {
    return(visible);
  }

#if DEBUG
  printf("vis3 %d\n", visible);
#endif

  if (!visible) {
    visible = clip_nochange (geometry, wright, wtop, wright, wbottom);
  } else {
    return(visible);
  }

#if DEBUG
  printf("vis4 %d\n", visible);
#endif

#if DEBUG
  printf("%d %d %d\n", wleft, geometry->viewport_top, wright);
  printf("%d %d %d\n", wtop, geometry->viewport_top, wbottom);
  printf("%d %d %d\n", wleft, geometry->viewport_right, wright);
  printf("%d %d %d\n", wtop, geometry->viewport_bottom, wbottom);
#endif

  /*
   * now check to see if bounding box encompasses the entire viewport.
   * We only need to test if one point on the screen clipping boundary
   * is indide the bounding box of the object.
   */
  if (geometry->viewport_left >= wleft  &&
      geometry->viewport_left <= wright &&
      geometry->viewport_top >= wtop    &&
      geometry->viewport_top <= wbottom ) {
    visible = 1;
  }

#if DEBUG
  printf("vis5 %d\n", visible);
#endif

  return(visible);
}