68 lines
2.4 KiB
C
68 lines
2.4 KiB
C
/* xscreensaver, Copyright (c) 1998-2002 Jamie Zawinski <jwz@jwz.org>
|
|
*
|
|
* Permission to use, copy, modify, distribute, and sell this software and its
|
|
* documentation for any purpose is hereby granted without fee, provided that
|
|
* the above copyright notice appear in all copies and that both that
|
|
* copyright notice and this permission notice appear in supporting
|
|
* documentation. No representations are made about the suitability of this
|
|
* software for any purpose. It is provided "as is" without express or
|
|
* implied warranty.
|
|
*/
|
|
|
|
#ifndef __ROTATOR_H__
|
|
#define __ROTATOR_H__
|
|
|
|
typedef struct rotator rotator;
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* Returns a rotator object, which encapsulates rotation and motion state.
|
|
|
|
spin_[xyz]_speed indicates the relative speed of rotation.
|
|
Specify 0 if you don't want any rotation around that axis.
|
|
|
|
spin_accel specifies a scaling factor for the acceleration that is
|
|
randomly applied to spin: if you want the speed to change faster,
|
|
make this > 1.
|
|
|
|
wander_speed indicates the relative speed through space.
|
|
|
|
If randomize_initial_state_p is true, then the initial position and
|
|
rotation will be randomized (even if the spin speeds are 0.) If it
|
|
is false, then all values will be initially zeroed.
|
|
*/
|
|
extern rotator *make_rotator (double spin_x_speed,
|
|
double spin_y_speed,
|
|
double spin_z_speed,
|
|
double spin_accel,
|
|
double wander_speed,
|
|
int randomize_initial_state_p);
|
|
|
|
/* Rotates one step, and returns the new rotation values.
|
|
x, y, and z range from 0.0-1.0, the fraction through the circle
|
|
(*not* radians or degrees!)
|
|
If `update_p' is non-zero, then (maybe) rotate first.
|
|
*/
|
|
extern void get_rotation (rotator *rot,
|
|
double *x_ret, double *y_ret, double *z_ret,
|
|
int update_p);
|
|
|
|
/* Moves one step, and returns the new position values.
|
|
x, y, and z range from 0.0-1.0, the fraction through space:
|
|
scale those values as needed.
|
|
If `update_p' is non-zero, then (maybe) move first.
|
|
*/
|
|
extern void get_position (rotator *rot,
|
|
double *x_ret, double *y_ret, double *z_ret,
|
|
int update_p);
|
|
|
|
/* Destroys and frees a `rotator' object. */
|
|
extern void free_rotator (rotator *r);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#endif /* __ROTATOR_H__ */
|