********> bugfix.26
Author:   Bill Ross
Date:     4/21/98

Programs: xleap

Severity: moderate

Description:	Crashes with floating point error when edit window of 1-atom
		molecule (such as an ion) is being created. Only seen on
		DEC Alphas, although it's a basic logic error.

Fix:		Make the folllowing changes to x3d.c:

------------------------------------------------------------------------------
*** OLD x3d.c
--- NEW x3d.c
***************
*** 639,646
  		x3dEngine->iScreenWidth, x3dEngine->iScreenHeight ));
  
      MESSAGE(( "Checking if scaling in X direction fits Y direction\n" ));
!     dScale = x3dEngine->iScreenWidth / dXWidth;
!     if ( dXWidth < VERYSMALL && dYWidth < VERYSMALL ) {
  	dScale = 1;
      } else if ( dScale * dYWidth < x3dEngine->iScreenWidth ) {
  	MESSAGE(( "Scaling X   scale = %lf\n", dScale ));

--- 639,645 -----
  		x3dEngine->iScreenWidth, x3dEngine->iScreenHeight ));
  
      MESSAGE(( "Checking if scaling in X direction fits Y direction\n" ));
!     if ( dXWidth < VERYSMALL )
  	dScale = 1;
      else
  	dScale = x3dEngine->iScreenWidth / dXWidth;
***************
*** 642,648
      dScale = x3dEngine->iScreenWidth / dXWidth;
      if ( dXWidth < VERYSMALL && dYWidth < VERYSMALL ) {
  	dScale = 1;
!     } else if ( dScale * dYWidth < x3dEngine->iScreenWidth ) {
  	MESSAGE(( "Scaling X   scale = %lf\n", dScale ));
      } else if ( dScale * dYWidth >= x3dEngine->iScreenWidth ){
  	dScale = x3dEngine->iScreenHeight/dYWidth;

--- 641,650 -----
      MESSAGE(( "Checking if scaling in X direction fits Y direction\n" ));
      if ( dXWidth < VERYSMALL )
  	dScale = 1;
!     else
! 	dScale = x3dEngine->iScreenWidth / dXWidth;
! 	
!     if ( dScale * dYWidth < x3dEngine->iScreenWidth ) {
  	MESSAGE(( "Scaling X   scale = %lf\n", dScale ));
      } else if ( dYWidth > VERYSMALL ) {
  	dScale = x3dEngine->iScreenHeight/dYWidth;
***************
*** 644,650
  	dScale = 1;
      } else if ( dScale * dYWidth < x3dEngine->iScreenWidth ) {
  	MESSAGE(( "Scaling X   scale = %lf\n", dScale ));
!     } else if ( dScale * dYWidth >= x3dEngine->iScreenWidth ){
  	dScale = x3dEngine->iScreenHeight/dYWidth;
  	MESSAGE(( "Scaling Y   scale = %lf\n", dScale ));
      }

--- 646,652 -----
  	
      if ( dScale * dYWidth < x3dEngine->iScreenWidth ) {
  	MESSAGE(( "Scaling X   scale = %lf\n", dScale ));
!     } else if ( dYWidth > VERYSMALL ) {
  	dScale = x3dEngine->iScreenHeight/dYWidth;
  	MESSAGE(( "Scaling Y   scale = %lf\n", dScale ));
      }
------------------------------------------------------------------------------