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viewpnt.c
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1990-08-26
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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:
*
* ATX (613) 526-4141
* OMX (613) 731-3419
* Mystic (613) 731-0088 or (613) 731-6698
*
* Fidonet: 1:163/109.9
* Internet: David_Buck@Carleton.CA
*
* IBM Port by Aaron A. Collins. Aaron may be reached on the following BBS'es:
*
* Lattice BBS (708) 916-1200
* The Information Exchange BBS (708) 945-5575
* Stillwaters BBS (708) 403-2826
*
*****************************************************************************/
#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);
}