/*# proc: box_overlap_hori - determines if two boxes overlap horizontally.# proc:# proc: is_box_inside - determines if one box is inside another.# proc:*/#include <defs.h>/*************************************************************************/box_overlap_hori(cx1, cy1, cx2, cy2, nx1, ny1, nx2, ny2)int cx1, cy1, cx2, cy2, nx1, ny1, nx2, ny2;{   if(((nx1 <= cx1) && (cx1 <= nx2)) ||      ((cx1 <= nx1) && (nx1 <= cx2)))      return(TRUE);   else      return(FALSE);}/************************************************************/is_box_inside(bix, biy, bix2, biy2, box, boy, box2, boy2)int bix, biy, bix2, biy2, box, boy, box2, boy2;{   if((bix >= box) && (bix2 <= box2) &&      (biy >= boy) && (biy2 <= boy2))      return(TRUE);   else      return(FALSE);}