trans.c File Reference

OGSF library - matrix transformation (higher level functions) More...

#include <math.h>
#include <grass/gis.h>
#include <grass/glocale.h>
#include <grass/gstypes.h>

Include dependency graph for trans.c:

Go to the source code of this file.

Macros
#define	MAX_STACK   20
#define	NPI   M_PI

Functions
void	P_scale (float x, float y, float z)
	ADD. More...
void	P_transform (int num_vert, float(*in)[4], float(*out)[4])
	Transform array of vectors using current T matrix. More...
int	P_pushmatrix (void)
	Push current transformation matrix onto matrix stack. More...
int	P_popmatrix (void)
	Pop top of matrix stack, placing it into the current transformation matrix. More...
void	P_rot (float angle, char axis)
	Rotate matrix. More...

Detailed Description

OGSF library - matrix transformation (higher level functions)

GRASS OpenGL gsurf OGSF Library

NOTE: This file should be REMOVED and any calls to the functions in this file should be replaced with appropriate OpenGL calls.

This routine should be available in GL!

Arguments are same as GL counterparts

I threw this code together in January at the beginning of this class. I was still learning about GL at the time. There are many places where the code could be improved.

(C) 1999-2008 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

Dave Gerdes Jan 1990 All rights reserved, US Army Construction Engineering Research Lab

Bill Brown USACERL (November 1993)

Doxygenized by Martin Landa <landa.martin gmail.com> (May 2008)

Definition in file trans.c.

Macro Definition Documentation

#define MAX_STACK   20

Definition at line 37 of file trans.c.

Referenced by P_pushmatrix().

#define NPI   M_PI

Definition at line 51 of file trans.c.

Referenced by P_rot().

Function Documentation

int P_popmatrix

(

void

)

Pop top of matrix stack, placing it into the current transformation matrix.

Returns

-1 on failure

0 on success

Definition at line 197 of file trans.c.

References G_warning().

Referenced by gsd_update_cpnorm(), P_rot(), and P_scale().

int P_pushmatrix

(

void

)

Push current transformation matrix onto matrix stack.

Definition at line 177 of file trans.c.

References G_warning(), and MAX_STACK.

Referenced by gsd_update_cpnorm(), P_rot(), and P_scale().

void P_rot	(	float	angle,
		char	axis
	)

Rotate matrix.

Parameters

angle	angle value
axis	('x, 'y', 'z')

Definition at line 217 of file trans.c.

References NPI, P_popmatrix(), and P_pushmatrix().

Referenced by gsd_update_cpnorm().

void P_scale	(	float	x,
		float	y,
		float	z
	)

ADD.

Parameters

x,y,z

Definition at line 75 of file trans.c.

References P_popmatrix(), P_pushmatrix(), and y.

void P_transform	(	int	num_vert,
		float(*)	in[4],
		float(*)	out[4]
	)

Transform array of vectors using current T matrix.

Multiply 'in' matrix (homogenous coordinate generally) by the current transformation matrix, placing the result in 'out'

[in][trans_mat] => [out]

Parameters

num_vert
in
out

Definition at line 117 of file trans.c.

Referenced by gsd_update_cpnorm().