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- /*****************************************************************************
- *
- * viewpnt.c
- *
- * from DKBTrace (c) 1990 David Buck
- *
- * This module implements methods for managing the viewpoint.
- *
- * This software is freely distributable. The source and/or object code may be
- * copied or uploaded to communications services so long as this notice remains
- * at the top of each file. If any changes are made to the program, you must
- * clearly indicate in the documentation and in the programs startup message
- * who it was who made the changes. The documentation should also describe what
- * those changes were. This software may not be included in whole or in
- * part into any commercial package without the express written consent of the
- * author. It may, however, be included in other public domain or freely
- * distributed software so long as the proper credit for the software is given.
- *
- * This software is provided as is without any guarantees or warranty. Although
- * the author has attempted to find and correct any bugs in the software, he
- * is not responsible for any damage caused by the use of the software. The
- * author is under no obligation to provide service, corrections, or upgrades
- * to this package.
- *
- * Despite all the legal stuff above, if you do find bugs, I would like to hear
- * about them. Also, if you have any comments or questions, you may contact me
- * at the following address:
- *
- * David Buck
- * 22C Sonnet Cres.
- * Nepean Ontario
- * Canada, K2H 8W7
- *
- * I can also be reached on the following bulleton boards:
- *
- * OMX (613) 731-3419
- * Mystic (613) 596-4249 or (613) 596-4772
- *
- * Fidonet: 1:163/109.9
- * Internet: dbuck@ccs.carleton.ca
- * The "You Can Call Me RAY" BBS (708) 358-5611
- *
- * IBM Port by Aaron A. Collins. Aaron may be reached on the following BBS'es:
- *
- * The "You Can Call Me RAY" BBS (708) 358-5611
- * The Information Exchange BBS (708) 945-5575
- *
- *****************************************************************************/
-
- #include "frame.h"
- #include "vector.h"
- #include "dkbproto.h"
-
- METHODS Viewpoint_Methods =
- { NULL, NULL, NULL, NULL, Copy_Viewpoint,
- Translate_Viewpoint, Rotate_Viewpoint,
- Scale_Viewpoint, NULL};
-
- void *Copy_Viewpoint (Object)
- OBJECT *Object;
- {
- VIEWPOINT *Viewpoint = (VIEWPOINT *) Object;
- VIEWPOINT *New_Viewpoint;
-
- New_Viewpoint = Get_Viewpoint();
-
- New_Viewpoint -> Location = Viewpoint -> Location;
- New_Viewpoint -> Direction = Viewpoint -> Direction;
- New_Viewpoint -> Right = Viewpoint -> Right;
- New_Viewpoint -> Up = Viewpoint -> Up;
- return (New_Viewpoint);
- }
-
- void Translate_Viewpoint (Object, Vector)
- OBJECT *Object;
- VECTOR *Vector;
- {
- VAdd (((VIEWPOINT *) Object) -> Location,
- ((VIEWPOINT *) Object) -> Location,
- *Vector);
- }
-
- void Rotate_Viewpoint (Object, Vector)
- OBJECT *Object;
- VECTOR *Vector;
- {
- TRANSFORMATION Transformation;
- VIEWPOINT *Viewpoint = (VIEWPOINT *) Object;
-
- Get_Rotation_Transformation(&Transformation, Vector);
- MTransformVector (&(Viewpoint -> Location),
- &(Viewpoint -> Location), &Transformation);
-
- MTransformVector (&(Viewpoint -> Direction),
- &(Viewpoint -> Direction), &Transformation);
-
- MTransformVector (&(Viewpoint -> Up),
- &(Viewpoint -> Up), &Transformation);
-
- MTransformVector (&(Viewpoint -> Right),
- &(Viewpoint -> Right), &Transformation);
- }
-
- void Scale_Viewpoint (Object, Vector)
- OBJECT *Object;
- VECTOR *Vector;
- {
- TRANSFORMATION Transformation;
- VIEWPOINT *Viewpoint = (VIEWPOINT *) Object;
-
- Get_Scaling_Transformation(&Transformation, Vector);
- MTransformVector (&(Viewpoint -> Location),
- &(Viewpoint -> Location), &Transformation);
-
- MTransformVector (&(Viewpoint -> Direction),
- &(Viewpoint -> Direction), &Transformation);
-
- MTransformVector (&(Viewpoint -> Up),
- &(Viewpoint -> Up), &Transformation);
-
- MTransformVector (&(Viewpoint -> Right),
- &(Viewpoint -> Right), &Transformation);
- }
-
-