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author | bnewbold <bnewbold@robocracy.org> | 2016-05-06 14:00:19 -0400 |
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committer | bnewbold <bnewbold@robocracy.org> | 2016-05-06 14:00:19 -0400 |
commit | 88608ff1d844d36b824e33aaa90cf25f1e028b1b (patch) | |
tree | 7ca29bc81d31cdb93f3f9d46b40d9c10d72f5217 /original/rotator.h | |
parent | ec1e1ec92d870ae3a57b06b3b214d304d729532b (diff) | |
download | exuberant-hacks-88608ff1d844d36b824e33aaa90cf25f1e028b1b.tar.gz exuberant-hacks-88608ff1d844d36b824e33aaa90cf25f1e028b1b.zip |
pull in original xscreensaver code
Diffstat (limited to 'original/rotator.h')
-rw-r--r-- | original/rotator.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/original/rotator.h b/original/rotator.h new file mode 100644 index 0000000..b3f36f6 --- /dev/null +++ b/original/rotator.h @@ -0,0 +1,60 @@ +/* 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; + +/* 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); + +#endif /* __ROTATOR_H__ */ |