OGSF library - setting and manipulating keyframes animation. More...

#include <stdlib.h>
#include <grass/gis.h>
#include <grass/glocale.h>
#include <grass/ogsf.h>

Include dependency graph for gk2.c:

Functions
int	GK_set_interpmode (int mode)
	Set interpolation mode.
void	GK_set_tension (float tens)
	Set value for tension when interpmode is KF_SPLINE.
void	GK_showtension_start (void)
void	GK_showtension_stop (void)
	Show tension stop ?
void	GK_update_tension (void)
	Update tension.
void	GK_print_keys (const char *name)
	Print keyframe info.
void	GK_update_frames (void)
	Recalculate path using the current number of frames requested.
void	GK_set_numsteps (int newsteps)
	Set the number of frames to be interpolated from keyframes.
void	GK_clear_keys (void)
	Deletes all keyframes, resets field masks.
int	GK_move_key (float oldpos, float precis, float newpos)
	Move keyframe.
int	GK_delete_key (float pos, float precis, int justone)
int	GK_add_key (float pos, unsigned long fmask, int force_replace, float precis)
	Add keyframe.
void	GK_do_framestep (int step, int render)
	Moves the animation to frame number "step".
void	GK_show_path (int flag)
	Draw the current path.
void	GK_show_vect (int flag)
	Show vector sets.
void	GK_show_site (int flag)
	Show point sets.
void	GK_show_vol (int flag)
	Show volumes.
void	GK_show_list (int flag)
	Show list.

Detailed Description

OGSF library - setting and manipulating keyframes animation.

GRASS OpenGL gsurf OGSF Library

This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.

Author: Bill Brown USACERL, GMSL/University of Illinois; Doxygenized by Martin Landa <landa.martin gmail.com> (May 2008)

Definition in file gk2.c.

Function Documentation

◆ GK_add_key()

int GK_add_key	(	float	pos,
		unsigned long	fmask,
		int	force_replace,
		float	precis )

Add keyframe.

The pos value is the relative position in the animation for this particular keyframe - used to compare relative distance to neighboring keyframes, it can be any floating point value.

The fmask value can be any of the following or'd together:

KF_FROMX_MASK
KF_FROMY_MASK
KF_FROMZ_MASK
KF_FROM_MASK (KF_FROMX_MASK | KF_FROMY_MASK | KF_FROMZ_MASK)
KF_DIRX_MASK
KF_DIRY_MASK
KF_DIRZ_MASK
KF_DIR_MASK (KF_DIRX_MASK | KF_DIRY_MASK | KF_DIRZ_MASK)
KF_FOV_MASK
KF_TWIST_MASK
KF_ALL_MASK (KF_FROM_MASK | KF_DIR_MASK | KF_FOV_MASK | KF_TWIST_MASK)

Other fields will be added later.

The value precis and the boolean force_replace are used to determine if a keyframe should be considered to be at the same position as a pre-existing keyframe. e.g., if anykey.pos - newkey.pos <= precis, GK_add_key() will fail unless force_replace is TRUE.

Parameters

pos	position
fmask
force_replace
precis	precision value

Returns: 1 if key is added; -1 key not added

Definition at line 431 of file gk2.c.

References G_debug(), GK_add_key(), GK_update_frames(), GS_get_fov(), GS_get_from(), GS_get_twist(), GS_get_viewdir(), NULL, X, and Y.

Referenced by GK_add_key().

◆ GK_clear_keys()

void GK_clear_keys ( void )

Deletes all keyframes, resets field masks.

Doesn't change number of frames requested.

Definition at line 312 of file gk2.c.

References GK_clear_keys(), gk_free_key(), and NULL.

Referenced by GK_clear_keys().

◆ GK_delete_key()

int GK_delete_key	(	float	pos,
		float	precis,
		int	justone )

Delete keyframe

The values pos and precis are used to determine which keyframes to delete. Any keyframes with their position within precis of pos will be deleted if justone is zero. If justone is non-zero, only the first (lowest pos) keyframe in the range will be deleted.

Parameters