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/**
** sipp - SImple Polygon Processor
**
** A general 3d graphic package
**
** Copyright Equivalent Software HB 1992
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 1, or any later version.
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
** You can receive a copy of the GNU General Public License from the
** Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**/
/**
** transforms.c - Functions that handles object transformations.
**/
#include <stdio.h>
#include <sipp.h>
/*
* Set the transformation matrix of OBJ to MATRIX.
*/
void
object_set_transf(obj, matrix)
Object *obj;
Transf_mat *matrix;
{
MatCopy(&obj->transf, matrix);
}
/*
* Retrieve the transformation matrix of OBJ
*/
Transf_mat *
object_get_transf(obj, matrix)
Object *obj;
Transf_mat *matrix;
{
Transf_mat *tmp;
if (matrix != NULL) {
MatCopy(matrix, &obj->transf);
return matrix;
} else {
tmp = transf_mat_create(NULL);
MatCopy(tmp, &obj->transf);
return tmp;
}
}
/*
* Set the transformation matrix of OBJ to the identity matrix.
*/
void
object_clear_transf(obj)
Object *obj;
{
MatCopy(&obj->transf, &ident_matrix);
}
/*
* Post multiply MATRIX into the transformation matrix of OBJ.
*/
void
object_transform(obj, matrix)
Object *obj;
Transf_mat *matrix;
{
mat_mul(&obj->transf, &obj->transf, matrix);
}
/*
* Rotate the object OBJ ANG radians about the x-axis.
*/
void
object_rot_x(obj, ang)
Object *obj;
double ang;
{
mat_rotate_x(&obj->transf, ang);
}
/*
* Rotate the object OBJ ANG radians about the y-axis.
*/
void
object_rot_y(obj, ang)
Object *obj;
double ang;
{
mat_rotate_y(&obj->transf, ang);
}
/*
* Rotate the object OBJ ANG radians about the z-axis.
*/
void
object_rot_z(obj, ang)
Object *obj;
double ang;
{
mat_rotate_z(&obj->transf, ang);
}
/*
* Rotate the object OBJ ANG radians about the line defined
* by POINT and VEC.
*/
void
object_rot(obj, point, vec, ang)
Object *obj;
Vector *point;
Vector *vec;
double ang;
{
mat_rotate(&obj->transf, point, vec, ang);
}
/*
* Scale the object OBJ with respect to the origin.
*/
void
object_scale(obj, xscale, yscale, zscale)
Object *obj;
double xscale, yscale, zscale;
{
mat_scale(&obj->transf, xscale, yscale, zscale);
}
/*
* Translate the object OBJ.
*/
void
object_move(obj, dx, dy, dz)
Object *obj;
double dx, dy, dz;
{
mat_translate(&obj->transf, dx, dy, dz);
}
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