Nviz library – Change view settings. More...

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

Include dependency graph for change_view.c:

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

Detailed Description

Nviz library – Change view settings.

Based on visualization/nviz/src/change_view.c

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 238 of file change_view.c.

References G_debug(), GS_global_exag(), GS_set_global_exag(), Nviz_change_exag(), and Nviz_update_ranges().

Referenced by Nviz_change_exag().

◆ 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 [unused]
fly_info	values computed from mouse movement
scale	rate of movement
lateral	type of movement

Definition at line 324 of file change_view.c.

References GS_get_from(), GS_get_viewdir(), GS_moveto(), GS_set_viewdir(), Nviz_flythrough(), X, and Y.

Referenced by Nviz_flythrough().

◆ Nviz_get_modelview()

void Nviz_get_modelview ( double * modelMatrix )

Get current modelview matrix.

Definition at line 272 of file change_view.c.

References Nviz_get_modelview().

Referenced by Nviz_get_modelview().

◆ Nviz_get_viewpoint_height()

void Nviz_get_viewpoint_height ( double * height )

Definition at line 181 of file change_view.c.

References G_debug(), GS_get_from_real(), and Nviz_get_viewpoint_height().

Referenced by Nviz_get_viewpoint_height().

◆ Nviz_get_viewpoint_position()

void Nviz_get_viewpoint_position	(	double *	x_pos,
		double *	y_pos )

Definition at line 131 of file change_view.c.

References G_debug(), GS_get_from(), Nviz_get_viewpoint_position(), X, and Y.

Referenced by Nviz_get_viewpoint_position().

◆ Nviz_init_rotation()

void Nviz_init_rotation ( void )

Stop scene rotation.

Definition at line 306 of file change_view.c.

References GS_init_rotation(), and Nviz_init_rotation().

Referenced by Nviz_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 262 of file change_view.c.

References G_debug(), GS_look_here(), and Nviz_look_here().

Referenced by Nviz_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 30 of file change_view.c.

References G_debug(), GS_alldraw_wire(), GS_done_draw(), GS_ready_draw(), GS_set_draw(), GS_set_viewport(), and Nviz_resize_window().

Referenced by Nviz_resize_window().

◆ 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