change_view.c File Reference

Nviz library – Change view settings. More...

#include <math.h>
#include <grass/glocale.h>
#include <grass/nviz.h>

Include dependency graph for change_view.c:

Go to the source code of this file.

Functions
int	Nviz_resize_window (int width, int height)
	GL canvas resized. More...
int	Nviz_update_ranges (nv_data *dc)
	Update ranges. More...
int	Nviz_set_viewpoint_position (double x_pos, double y_pos)
	Change position of view. More...
void	Nviz_get_viewpoint_position (double *x_pos, double *y_pos)
int	Nviz_set_viewpoint_height (double height)
	Change viewpoint height. More...
void	Nviz_get_viewpoint_height (double *height)
int	Nviz_set_viewpoint_persp (int persp)
	Change viewpoint perspective (field of view) More...
int	Nviz_set_viewpoint_twist (int twist)
	Change viewpoint twist. More...
int	Nviz_change_exag (nv_data *data, double exag)
	Change z-exag value. More...
int	Nviz_look_here (double sx, double sy)
	Change focused point. More...
void	Nviz_get_modelview (double *modelMatrix)
	Get current modelview matrix. More...
void	Nviz_set_rotation (double angle, double x, double y, double z)
	Set rotation parameters. More...
void	Nviz_unset_rotation (void)
	Stop scene rotation. More...
void	Nviz_init_rotation (void)
	Stop scene rotation. More...
void	Nviz_flythrough (nv_data *data, float *fly_info, int *scale, int lateral)
	Fly through the scene. More...

Detailed Description

Nviz library – Change view settings.

Based on visualization/nviz/src/change_view.c

(C) 2008, 2010 by the GRASS Development Team This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.

Author

Updated/modified by Martin Landa <landa.martin gmail.com> (Google SoC 2008/2010)

Definition in file change_view.c.

Function Documentation

Nviz_change_exag()

int Nviz_change_exag	(	nv_data *	data,
		double	exag
	)

Change z-exag value.

Parameters

data	nviz data
exag	exag value

Returns

1

Definition at line 236 of file change_view.c.

Nviz_flythrough()

void Nviz_flythrough	(	nv_data *	data,
		float *	fly_info,
		int *	scale,
		int	lateral
	)

Fly through the scene.

Computes parameters needed for moving scene. Changes viewpoint and viewdir. Based on visualization/nviz/src/togl_flythrough.c and simplified.

Parameters

data	nviz data
fly_info	values computed from mouse movement
scale	rate of movement
lateral	type of movement

Definition at line 320 of file change_view.c.

Nviz_get_modelview()

void Nviz_get_modelview

(

double *

modelMatrix

)

Get current modelview matrix.

Definition at line 269 of file change_view.c.

Nviz_get_viewpoint_height()

void Nviz_get_viewpoint_height

(

double *

height

)

Definition at line 180 of file change_view.c.

Nviz_get_viewpoint_position()

void Nviz_get_viewpoint_position	(	double *	x_pos,
		double *	y_pos
	)

Definition at line 130 of file change_view.c.

References G_debug(), GS_get_from(), RANGE, RANGE_OFFSET, X, and Y.

Nviz_init_rotation()

void Nviz_init_rotation

(

void

)

Stop scene rotation.

Definition at line 302 of file change_view.c.

References GS_init_rotation().

Nviz_look_here()

int Nviz_look_here	(	double	sx,
		double	sy
	)

Change focused point.

Parameters

sx,sy

screen coordinates

Returns

1

Definition at line 259 of file change_view.c.

References G_debug(), and GS_look_here().

Nviz_resize_window()

int Nviz_resize_window	(	int	width,
		int	height
	)

GL canvas resized.

Parameters

width	window width
height	window height

Returns

1 on success

0 on failure (window resized by default to 20x20 px)

Definition at line 29 of file change_view.c.

Nviz_set_rotation()

void Nviz_set_rotation	(	double	angle,
		double	x,
		double	y,
		double	z
	)

Set rotation parameters.

Rotate scene by given parameters related to mouse drag event (difference from current state). Coordinates determine the second point of rotation axis, the first point is (0, 0, 0).

Parameters

angle	angle
x,y,z	axis coordinate

Definition at line 285 of file change_view.c.

References G_debug(), and GS_set_rotation().

Nviz_set_viewpoint_height()

int Nviz_set_viewpoint_height

(

double

height

)

Change viewpoint height.

Parameters

height

height value (world coordinates)

Returns

1

Definition at line 156 of file change_view.c.

Nviz_set_viewpoint_persp()

int Nviz_set_viewpoint_persp

(

int

persp

)

Change viewpoint perspective (field of view)

Parameters

persp

perspective value (0-100, in degrees)

Returns

1

Definition at line 197 of file change_view.c.

References G_debug(), and GS_set_fov().

Nviz_set_viewpoint_position()

int Nviz_set_viewpoint_position	(	double	x_pos,
		double	y_pos
	)

Change position of view.

Parameters

x_pos	x position (model coordinates)
y_pos	y position (model coordinates)

Returns

1

Definition at line 96 of file change_view.c.

References G_debug(), GS_get_from(), GS_moveto(), RANGE, RANGE_OFFSET, X, and Y.

Nviz_set_viewpoint_twist()

int Nviz_set_viewpoint_twist

(

int

twist

)

Change viewpoint twist.

Parameters

twist

persp twist value (-180-180, in degrees)

Returns

1

Definition at line 218 of file change_view.c.

References G_debug(), and GS_set_twist().

Nviz_unset_rotation()

void Nviz_unset_rotation

(

void

)

Stop scene rotation.

Definition at line 294 of file change_view.c.

References GS_unset_rotation().

Nviz_update_ranges()

int Nviz_update_ranges

(

nv_data *

dc

)

Update ranges.

Call whenever a new surface is added, deleted, or exag changes

Returns

1

Definition at line 60 of file change_view.c.

References GS_get_longdim(), GS_get_zrange_nz(), GS_global_exag(), nv_data::xyrange, and nv_data::zrange.