/*! \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);
}
/*! \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);
}