OGSF library - setting and manipulating keyframes animation (lower level functions) More...

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

Include dependency graph for gk.c:

Go to the source code of this file.

Functions
Keylist *	gk_copy_key (Keylist *k)
	Copy keyframes.

unsigned long	gk_get_mask_sofar (float time, Keylist *keys)
	Get mask value.

int	gk_viable_keys_for_mask (unsigned long mask, Keylist keys, Keylist *keyret)
	ADD.

void	gk_follow_frames (Viewnode view, int numsteps, Keylist keys, int step, int onestep, int render, unsigned long mode)
	Checks key masks.

void	gk_free_key (Keylist *ok)
	Free keyframe list.

Viewnode *	gk_make_framesfromkeys (Keylist *keys, int keysteps, int newsteps, int loop, float t)
	Generate viewnode from keyframes.

double	get_key_neighbors (int nvk, double time, double range, int loop, Keylist karray[], Keylist km1, Keylist kp1, Keylist kp2, Keylist km2, double dt1, double *dt2)
	Find interval containing time.

double	lin_interp (float dt, float val1, float val2)
	Linear interpolation.

double	get_2key_neighbors (int nvk, float time, float range, int loop, Keylist karray[], Keylist km1, Keylist *kp1)
	Finds interval containing time, putting left (or equal) key at km1, right at kp1.

Viewnode *	gk_make_linear_framesfromkeys (Keylist *keys, int keysteps, int newsteps, int loop)
	Generate viewnode from keyframe list (linear interpolation)

void	correct_twist (Keylist *k)
	Correct twist value.

int	gk_draw_path (Viewnode views, int steps, Keylist keys)
	Draw path.

Detailed Description

OGSF library - setting and manipulating keyframes animation (lower level functions)

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 gk.c.

Function Documentation

◆ correct_twist()

void correct_twist ( Keylist * k )

Correct twist value.

Parameters

k	keyframe list

Definition at line 711 of file gk.c.

References key_node::fields, KF_TWIST, key_node::next, NULL, and t.

Referenced by gk_make_framesfromkeys(), and gk_make_linear_framesfromkeys().

◆ get_2key_neighbors()

double get_2key_neighbors	(	int	nvk,
		float	time,
		float	range,
		int	loop,
		Keylist *	karray[],
		Keylist **	km1,
		Keylist **	kp1
	)

Finds interval containing time, putting left (or equal) key at km1, right at kp1.

Parameters

nvk
time
range
loop
karray
km1
km2

Returns: interval value

Definition at line 564 of file gk.c.

References NULL.

Referenced by gk_make_linear_framesfromkeys().

◆ get_key_neighbors()

double get_key_neighbors	(	int	nvk,
		double	time,
		double	range,
		int	loop,
		Keylist *	karray[],
		Keylist **	km1,
		Keylist **	kp1,
		Keylist **	kp2,
		Keylist **	km2,
		double *	dt1,
		double *	dt2
	)

Find interval containing time.

Changed June 94 to handle masks - now need to have called get_viable_keys for appropriate mask first to build the ARRAY of viable keyframes.

Putting left (or equal) key at km1, right at kp1, 2nd to right at kp2, and second to left at km2. dt1 is given the length of the current + left intervals dt2 is given the length of the current + right intervals

Parameters

nvk
time
range
loop
karray
km1
kp1
kp2
km2
dt1
dt2

Returns: the length of the current interval; 0 on error

Definition at line 462 of file gk.c.

References NULL.

Referenced by gk_make_framesfromkeys().

◆ gk_copy_key()

Keylist * gk_copy_key ( Keylist * k )

Copy keyframes.

Parameters

k	source keyframes

Returns: pointer to Keylist struct (target)

Definition at line 45 of file gk.c.

References key_node::fieldmask, key_node::fields, G_malloc, KF_NUMFIELDS, key_node::look_ahead, NULL, and key_node::pos.

◆ gk_draw_path()

int gk_draw_path	(	Viewnode *	views,
		int	steps,
		Keylist *	keys
	)

Draw path.

Parameters

views	Viewnode struct
steps	step value
keys	keyframe list

Returns: 0 on failure; 1 on success

Definition at line 749 of file gk.c.

References CM_COLOR, view_node::fields, key_node::fields, GS_background_color(), GS_default_draw_color(), GS_get_from(), GS_get_longdim(), gsd_bgnline(), gsd_color_func(), gsd_colormode(), gsd_endline(), gsd_linewidth(), gsd_vert_func(), gsd_x(), gsd_zwritemask(), KF_FROMX, key_node::next, and NULL.

Referenced by gk_follow_frames(), GK_set_tension(), and GK_show_path().

◆ gk_follow_frames()

void gk_follow_frames	(	Viewnode *	view,
		int	numsteps,
		Keylist *	keys,
		int	step,
		int	onestep,
		int	render,
		unsigned long	mode
	)

Checks key masks.

Because if they're masked up until the current position, pre-existing (or current) field should be used.

Parameters

view	pointer to Viewmode struct
numsteps	number of steps
keys	list of keyframes
step	step value
onestep
render
mode

Definition at line 141 of file gk.c.

References view_node::fields, FM_LABEL, FM_PATH, FM_SITE, FM_VECT, FM_VOL, G_debug(), gk_draw_path(), gk_get_mask_sofar(), GP_alldraw_site(), GS_alldraw_cplane_fences(), GS_alldraw_surf(), GS_alldraw_wire(), GS_background_color(), GS_clear(), GS_done_draw(), GS_draw_all_list(), GS_get_from(), GS_get_viewdir(), GS_getlight_position(), GS_moveto(), GS_ready_draw(), GS_set_draw(), GS_set_fov(), GS_set_twist(), GS_set_viewdir(), GS_setlight_position(), GSD_BACK, GSD_FRONT, GV_alldraw_vect(), GVL_alldraw_vol(), KF_DIRX, KF_DIRX_MASK, KF_DIRY, KF_DIRY_MASK, KF_DIRZ, KF_DIRZ_MASK, KF_FOV, KF_FOV_MASK, KF_FROMX, KF_FROMX_MASK, KF_FROMY, KF_FROMY_MASK, KF_FROMZ, KF_FROMZ_MASK, KF_TWIST, KF_TWIST_MASK, X, x, Y, and Z.

Referenced by GK_do_framestep().

◆ gk_free_key()

void gk_free_key ( Keylist * ok )

Free keyframe list.

Parameters

ok	pointer to Keylist struct

Definition at line 271 of file gk.c.

References G_free(), and key_node::next.

Referenced by GK_clear_keys().

◆ gk_get_mask_sofar()

unsigned long gk_get_mask_sofar	(	float	time,
		Keylist *	keys
	)

Get mask value.

Get begin & end pos, AND all masks in keys <= pos

Time must be between 0.0 & 1.0

Parameters

time	timestamp
keys	list of keyframes

Returns: mask value

Definition at line 79 of file gk.c.

References key_node::fieldmask, key_node::next, and key_node::pos.

Referenced by gk_follow_frames().

◆ gk_make_framesfromkeys()

Viewnode * gk_make_framesfromkeys	(	Keylist *	keys,
		int	keysteps,
		int	newsteps,
		int	loop,
		float	t
	)

Generate viewnode from keyframes.

Here we use a cardinal cubic spline

Parameters

keys	list of keyframes
keysteps	keyframe step
newsteps	new step value
loop	loop indicator
t

Returns: pointer to Viewnode; NULL on failure

Definition at line 301 of file gk.c.

References _, correct_twist(), view_node::fields, key_node::fields, G_free(), G_malloc, G_warning(), get_key_neighbors(), gk_viable_keys_for_mask(), KF_NUMFIELDS, lin_interp(), key_node::next, NULL, key_node::pos, t, and x.

Referenced by GK_update_frames().

◆ gk_make_linear_framesfromkeys()

Viewnode * gk_make_linear_framesfromkeys	(	Keylist *	keys,
		int	keysteps,
		int	newsteps,
		int	loop
	)

Generate viewnode from keyframe list (linear interpolation)

Here we use linear interpolation. Loop variable isn't used, but left in for use in possible "linear interp with smoothing" version.

Parameters

keys	keyframe list
keysteps	step value
newsteps	new step value
loop	loop indicator

Returns: pointer to viewnode struct; NULL on failure

Definition at line 611 of file gk.c.

References _, correct_twist(), view_node::fields, G_free(), G_malloc, G_warning(), get_2key_neighbors(), gk_viable_keys_for_mask(), KF_NUMFIELDS, lin_interp(), key_node::next, NULL, and key_node::pos.

Referenced by GK_update_frames().

◆ gk_viable_keys_for_mask()

int gk_viable_keys_for_mask	(	unsigned long	mask,
		Keylist *	keys,
		Keylist **	keyret
	)

ADD.

Parameters

	mask	mask value
	keys	list of keyframes
[out]	keyret	output list of keyframes

Returns: number of output keyframes

Definition at line 113 of file gk.c.

References key_node::fieldmask, and key_node::next.

Referenced by gk_make_framesfromkeys(), and gk_make_linear_framesfromkeys().

◆ lin_interp()

double lin_interp	(	float	dt,
		float	val1,
		float	val2
	)

Linear interpolation.

Parameters

dt	coefficient
val2	value 2
val1	value 1

Returns: val1 + dt * (val2 - val1)

Definition at line 545 of file gk.c.

Referenced by gk_make_framesfromkeys(), and gk_make_linear_framesfromkeys().

Functions

Detailed Description

Function Documentation

◆ correct_twist()

◆ get_2key_neighbors()

◆ get_key_neighbors()

◆ gk_copy_key()

◆ gk_draw_path()

◆ gk_follow_frames()

◆ gk_free_key()

◆ gk_get_mask_sofar()

◆ gk_make_framesfromkeys()

◆ gk_make_linear_framesfromkeys()

◆ gk_viable_keys_for_mask()

◆ lin_interp()