/
volumes.c
3040 lines (2629 loc) · 89.9 KB
/
volumes.c
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/* ----------------------------------------------------------------------------
@COPYRIGHT :
Copyright 1993,1994,1995 David MacDonald,
McConnell Brain Imaging Centre,
Montreal Neurological Institute, McGill University.
Permission to use, copy, modify, and distribute this
software and its documentation for any purpose and without
fee is hereby granted, provided that the above copyright
notice appear in all copies. The author and McGill University
make no representations about the suitability of this
software for any purpose. It is provided "as is" without
express or implied warranty.
---------------------------------------------------------------------------- */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /*HAVE_CONFIG_H*/
#include <internal_volume_io.h>
#include <limits.h>
#include <float.h>
VIO_STR XYZ_dimension_names[] = { MIxspace, MIyspace, MIzspace };
VIO_STR File_order_dimension_names[] = { "", "", "", "", "" };
static VIO_STR default_dimension_names[VIO_MAX_DIMENSIONS][VIO_MAX_DIMENSIONS] =
{
{ MIxspace },
{ MIyspace, MIxspace },
{ MIzspace, MIyspace, MIxspace },
{ "", MIzspace, MIyspace, MIxspace },
{ "", "", MIzspace, MIyspace, MIxspace }
};
/* ----------------------------- MNI Header -----------------------------------
@NAME : get_default_dim_names
@INPUT : n_dimensions
@OUTPUT :
@RETURNS : list of dimension names
@DESCRIPTION: Returns the list of default dimension names for the given
number of dimensions.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : 1993 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI VIO_STR *get_default_dim_names(
int n_dimensions )
{
return( default_dimension_names[n_dimensions-1] );
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : convert_spatial_axis_to_dim_name
@INPUT : axis
@OUTPUT :
@RETURNS : dimension name
@DESCRIPTION: Returns the name of the dimension.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : 1993 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
static VIO_STR convert_spatial_axis_to_dim_name(
int axis )
{
switch( axis )
{
case VIO_X: return( MIxspace );
case VIO_Y: return( MIyspace );
case VIO_Z: return( MIzspace );
default: handle_internal_error(
"convert_spatial_axis_to_dim_name" ); break;
}
return( NULL );
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : convert_dim_name_to_spatial_axis
@INPUT : dimension_name
@OUTPUT : axis
@RETURNS : TRUE if axis name is a spatial dimension
@DESCRIPTION: Checks if the dimension name corresponds to a spatial dimension
and if so, passes back the corresponding axis index.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : 1993 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI VIO_BOOL convert_dim_name_to_spatial_axis(
VIO_STR name,
int *axis )
{
*axis = -1;
if( equal_strings( name, MIxspace ) )
*axis = VIO_X;
else if( equal_strings( name, MIyspace ) )
*axis = VIO_Y;
else if( equal_strings( name, MIzspace ) )
*axis = VIO_Z;
return( *axis >= 0 );
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : create_volume
@INPUT : n_dimensions - number of dimensions (1-5)
dimension_names - name of dimensions for use when reading file
data_type - type of the data, e.g. NC_BYTE
signed_flag - type is signed?
min_value - min and max value to be stored
max_value
@OUTPUT :
@RETURNS : VIO_Volume
@DESCRIPTION: Creates a VIO_Volume structure, and initializes it. In order to
later use the volume, you must call either set_volume_size()
and alloc_volume_data(), or one of the input volume routines,
which in turn calls these two.
The dimension_names are used when inputting
MINC files, in order to match with the dimension names in the
file. Typically, use dimension names
{ MIzspace, MIyspace, MIxspace } to read the volume from the
file in the order it is stored, or
{ MIxspace, MIyspace, MIzspace } to read it so you can subcript
the volume in x, y, z order.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : June, 1993 David MacDonald
@MODIFIED : Nov. 15, 1996 D. MacDonald - handles space type
@MODIFIED : May 22, 1996 D. MacDonald - now stores starts/steps
---------------------------------------------------------------------------- */
VIOAPI VIO_Volume create_volume(
int n_dimensions,
VIO_STR dimension_names[],
nc_type nc_data_type,
VIO_BOOL signed_flag,
VIO_Real voxel_min,
VIO_Real voxel_max )
{
int i, axis, sizes[VIO_MAX_DIMENSIONS];
VIO_Status status;
VIO_STR name;
volume_struct *volume;
VIO_Transform identity;
status = VIO_OK;
if( n_dimensions < 1 || n_dimensions > VIO_MAX_DIMENSIONS )
{
print_error(
"create_volume(): n_dimensions (%d) not in range 1 to %d.\n",
n_dimensions, VIO_MAX_DIMENSIONS );
status = VIO_ERROR;
}
if( status == VIO_ERROR )
{
return( (VIO_Volume) NULL );
}
ALLOC( volume, 1 );
volume->is_rgba_data = FALSE;
volume->is_cached_volume = FALSE;
volume->real_range_set = FALSE;
volume->real_value_scale = 1.0;
volume->real_value_translation = 0.0;
volume->is_labels = FALSE;
for_less( i, 0, VIO_N_DIMENSIONS )
volume->spatial_axes[i] = -1;
for_less( i, 0, n_dimensions )
{
volume->starts[i] = 0.0;
volume->separations[i] = 1.0;
volume->direction_cosines[i][VIO_X] = 0.0;
volume->direction_cosines[i][VIO_Y] = 0.0;
volume->direction_cosines[i][VIO_Z] = 0.0;
volume->irregular_starts[i] = NULL;
volume->irregular_widths[i] = NULL;
sizes[i] = 0;
if( dimension_names != (char **) NULL )
name = dimension_names[i];
else
name = default_dimension_names[n_dimensions-1][i];
if( convert_dim_name_to_spatial_axis( name, &axis ) )
{
volume->spatial_axes[axis] = i;
volume->direction_cosines[i][axis] = 1.0;
}
volume->dimension_names[i] = create_string( name );
}
create_empty_multidim_array( &volume->array, n_dimensions, VIO_NO_DATA_TYPE );
set_volume_type( volume, nc_data_type, signed_flag, voxel_min, voxel_max );
set_volume_sizes( volume, sizes );
make_identity_transform( &identity );
create_linear_transform( &volume->voxel_to_world_transform, &identity );
volume->voxel_to_world_transform_uptodate = TRUE;
volume->coordinate_system_name = create_string( MI_UNKNOWN_SPACE );
return( volume );
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : set_volume_type
@INPUT : volume
nc_data_type
signed_flag
voxel_min
voxel_max
@OUTPUT :
@RETURNS :
@DESCRIPTION: Sets the data type and valid range of the volume.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : 1993 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI void set_volume_type(
VIO_Volume volume,
nc_type nc_data_type,
VIO_BOOL signed_flag,
VIO_Real voxel_min,
VIO_Real voxel_max )
{
VIO_Data_types data_type;
if( nc_data_type != MI_ORIGINAL_TYPE )
{
switch( nc_data_type )
{
case NC_BYTE:
if( signed_flag )
data_type = VIO_SIGNED_BYTE;
else
data_type = VIO_UNSIGNED_BYTE;
break;
case NC_SHORT:
if( signed_flag )
data_type = VIO_SIGNED_SHORT;
else
data_type = VIO_UNSIGNED_SHORT;
break;
case NC_INT:
if( signed_flag )
data_type = VIO_SIGNED_INT;
else
data_type = VIO_UNSIGNED_INT;
break;
case NC_FLOAT:
data_type = VIO_FLOAT;
break;
default:
case NC_DOUBLE:
data_type = VIO_DOUBLE;
break;
}
set_multidim_data_type( &volume->array, data_type );
volume->signed_flag = signed_flag;
set_volume_voxel_range( volume, voxel_min, voxel_max );
}
volume->nc_data_type = nc_data_type;
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : set_volume_type2
@INPUT : volume
minc2_data_type
voxel_min
voxel_max
@OUTPUT :
@RETURNS :
@DESCRIPTION: Sets the data type and valid range of the volume.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : 2013 Vladimir FONOV
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI void set_volume_type2(
VIO_Volume volume,
mitype_t minc2_data_type,
VIO_Real voxel_min,
VIO_Real voxel_max )
{
VIO_Data_types data_type;
VIO_BOOL signed_flag=0;
if( minc2_data_type != MI_ORIGINAL_TYPE )
{
switch( minc2_data_type )
{
case MI_TYPE_BYTE:
data_type = VIO_SIGNED_BYTE;
signed_flag=1;
volume->nc_data_type=NC_BYTE;
break;
case MI_TYPE_UBYTE:
data_type = VIO_UNSIGNED_BYTE;
volume->nc_data_type=NC_BYTE;
break;
case MI_TYPE_SHORT:
data_type = VIO_SIGNED_SHORT;
signed_flag=1;
volume->nc_data_type=NC_SHORT;
break;
case MI_TYPE_USHORT:
data_type = VIO_UNSIGNED_SHORT;
volume->nc_data_type=NC_SHORT;
break;
case MI_TYPE_INT:
data_type = VIO_SIGNED_INT;
volume->nc_data_type=NC_INT;
signed_flag=1;
break;
case MI_TYPE_UINT:
data_type = VIO_UNSIGNED_INT;
volume->nc_data_type=NC_INT;
break;
case MI_TYPE_FLOAT:
data_type = VIO_FLOAT;
volume->nc_data_type=NC_FLOAT;
signed_flag=1;
break;
default:
case MI_TYPE_DOUBLE:
data_type = VIO_DOUBLE;
signed_flag=1;
volume->nc_data_type=NC_DOUBLE;
break;
}
set_multidim_data_type( &volume->array, data_type );
volume->signed_flag = signed_flag;
set_volume_voxel_range( volume, voxel_min, voxel_max );
}
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : set_volume_labels
@INPUT : volume
is_labels
@OUTPUT :
@RETURNS :
@DESCRIPTION: Sets the data type flag to specify that volume contains discrete labels
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : 2013 Vladimir FONOV
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI void set_volume_labels(
VIO_Volume volume,
VIO_BOOL is_labels )
{
volume->is_labels=is_labels;
/*TODO: add sanity check for floating point volumes (?)*/
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : set_volume_labels
@INPUT : volume
@OUTPUT : is_labels
@RETURNS :
@DESCRIPTION: Gets the data type flag specifying that volume contains discrete labels
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : 2013 Vladimir FONOV
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI VIO_BOOL get_volume_labels(
VIO_Volume volume )
{
return volume->is_labels;
}
VIOAPI mitype_t nc_type_to_minc2_type(
nc_type nc_data_type,
VIO_BOOL signed_flag )
{
if(nc_data_type==MI_ORIGINAL_TYPE)
return MI_ORIGINAL_TYPE;
if(signed_flag)
{
switch(nc_data_type)
{
case NC_BYTE:
return MI_TYPE_BYTE;
case NC_SHORT:
return MI_TYPE_SHORT;
case NC_INT:
return MI_TYPE_INT;
case NC_FLOAT:
return MI_TYPE_FLOAT;
default:
case NC_DOUBLE:
return MI_TYPE_DOUBLE;
}
} else {
switch(nc_data_type)
{
case NC_BYTE:
return MI_TYPE_UBYTE;
case NC_SHORT:
return MI_TYPE_USHORT;
case NC_INT:
return MI_TYPE_UINT;
case NC_FLOAT:
return MI_TYPE_FLOAT;
default:
case NC_DOUBLE:
return MI_TYPE_DOUBLE;
}
}
}
VIOAPI mitype_t vio_type_to_minc2_type(
VIO_Data_types vio_data_type)
{
switch( vio_data_type )
{
case VIO_SIGNED_BYTE:
return MI_TYPE_BYTE;
case VIO_UNSIGNED_BYTE:
return MI_TYPE_UBYTE;
case VIO_SIGNED_SHORT:
return MI_TYPE_SHORT;
case VIO_UNSIGNED_SHORT:
return MI_TYPE_USHORT;
case VIO_SIGNED_INT:
return MI_TYPE_INT;
case VIO_UNSIGNED_INT:
return MI_TYPE_UINT;
case VIO_FLOAT:
return MI_TYPE_FLOAT;
default:
case VIO_DOUBLE:
return MI_TYPE_DOUBLE;
}
}
VIOAPI VIO_Data_types minc2_type_to_vio_type(
mitype_t minc_data_type)
{
switch( minc_data_type )
{
case MI_TYPE_BYTE:
return VIO_SIGNED_BYTE;
case MI_TYPE_UBYTE:
return VIO_UNSIGNED_BYTE;
case MI_TYPE_SHORT:
return VIO_SIGNED_SHORT;
case MI_TYPE_USHORT:
return VIO_UNSIGNED_SHORT;
case MI_TYPE_INT:
return VIO_SIGNED_INT;
case MI_TYPE_UINT:
return VIO_UNSIGNED_INT;
case MI_TYPE_FLOAT:
return VIO_FLOAT;
default:
case MI_TYPE_DOUBLE:
return VIO_DOUBLE;
}
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : get_volume_nc_data_type
@INPUT : volume
@OUTPUT : signed_flag
@RETURNS : data type
@DESCRIPTION: Returns the NETCDF data type of the volume and passes back
the signed flag.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : 1993 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI nc_type get_volume_nc_data_type(
VIO_Volume volume,
VIO_BOOL *signed_flag )
{
if( signed_flag != (VIO_BOOL *) NULL )
*signed_flag = volume->signed_flag;
return( volume->nc_data_type );
}
VIOAPI mitype_t get_volume_minc2_data_type(
VIO_Volume volume)
{
return vio_type_to_minc2_type( get_multidim_data_type( &volume->array ) );
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : get_volume_data_type
@INPUT : volume
@OUTPUT :
@RETURNS : data type
@DESCRIPTION: Returns the data type of the volume (not the NETCDF type).
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : 1993 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI VIO_Data_types get_volume_data_type(
VIO_Volume volume )
{
return( get_multidim_data_type( &volume->array ) );
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : set_rgb_volume_flag
@INPUT : volume
flag
@OUTPUT :
@RETURNS :
@DESCRIPTION: Sets the flag indicating that the volume is an RGB volume.
Can only set the flag to TRUE if the volume is an unsigned
long volume.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : Nov 13, 1995 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI void set_rgb_volume_flag(
VIO_Volume volume,
VIO_BOOL flag )
{
if( !flag || get_volume_data_type(volume) == VIO_UNSIGNED_INT )
volume->is_rgba_data = flag;
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : is_an_rgb_volume
@INPUT : volume
@OUTPUT :
@RETURNS : TRUE if it is an RGB volume
@DESCRIPTION: Tests if the volume is an RGB volume.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : Jun 21, 1995 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI VIO_BOOL is_an_rgb_volume(
VIO_Volume volume )
{
return( volume->is_rgba_data );
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : alloc_volume_data
@INPUT : volume
@OUTPUT :
@RETURNS :
@DESCRIPTION: Allocates the memory for the volume. Assumes that the
volume type and sizes have been set.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : June, 1993 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI void alloc_volume_data(
VIO_Volume volume )
{
#ifdef HAVE_MINC1
unsigned long data_size;
data_size = (unsigned long) get_volume_total_n_voxels( volume ) *
(unsigned long) get_type_size( get_volume_data_type( volume ) );
if( get_n_bytes_cache_threshold() >= 0 &&
data_size > (unsigned long) get_n_bytes_cache_threshold() )
{
volume->is_cached_volume = TRUE;
initialize_volume_cache( &volume->cache, volume );
}
else
{
#endif /*HAVE_MINC1*/
volume->is_cached_volume = FALSE;
alloc_multidim_array( &volume->array );
#ifdef HAVE_MINC1
}
#endif /*HAVE_MINC1*/
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : volume_is_alloced
@INPUT : volume
@OUTPUT :
@RETURNS : TRUE if the volume is allocated
@DESCRIPTION: Checks if the volume data has been allocated.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : Sep. 1, 1995 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI VIO_BOOL volume_is_alloced(
VIO_Volume volume )
{
#ifdef HAVE_MINC1
return ( volume->is_cached_volume && volume_cache_is_alloced( &volume->cache )) ||
(!volume->is_cached_volume && multidim_array_is_alloced( &volume->array )) ;
#else
return multidim_array_is_alloced( &volume->array ) ;
#endif
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : free_volume_data
@INPUT : volume
@OUTPUT :
@RETURNS :
@DESCRIPTION: Frees the memory associated with the volume multidimensional data.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : June, 1993 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI void free_volume_data(
VIO_Volume volume )
{
#ifdef HAVE_MINC1
if( volume->is_cached_volume )
delete_volume_cache( &volume->cache, volume );
else
#endif
if( volume_is_alloced( volume ) )
delete_multidim_array( &volume->array );
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : delete_volume
@INPUT : volume
@OUTPUT :
@RETURNS :
@DESCRIPTION: Frees all memory from the volume and the volume struct itself.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : June, 1993 David MacDonald
@MODIFIED : Nov. 15, 1996 D. MacDonald - handles space type
---------------------------------------------------------------------------- */
VIOAPI void delete_volume(
VIO_Volume volume )
{
int d;
if( volume == (VIO_Volume) NULL )
{
print_error( "delete_volume(): cannot delete a null volume.\n" );
return;
}
free_volume_data( volume );
delete_general_transform( &volume->voxel_to_world_transform );
for_less( d, 0, get_volume_n_dimensions(volume) ) {
delete_string( volume->dimension_names[d] );
if( volume->irregular_starts[d] ) FREE( volume->irregular_starts[d] );
if( volume->irregular_widths[d] ) FREE( volume->irregular_widths[d] );
}
delete_string( volume->coordinate_system_name );
FREE( volume );
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : set_volume_n_dimensions
@INPUT : volume
@OUTPUT :
@RETURNS : TRUE if successful
@DESCRIPTION: Returns the number of dimensions of the volume
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : June, 1993 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI VIO_BOOL set_volume_n_dimensions(
VIO_Volume volume,
int n_dimensions)
{
if ( volume != NULL )
{
/* avoid leak by deleting excess dimensions */
int i;
for_less(i, n_dimensions, get_multidim_n_dimensions( &volume->array ))
{
FREE( volume->dimension_names[i] );
}
return set_multidim_n_dimensions( &volume->array, n_dimensions );
}
return FALSE;
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : get_volume_n_dimensions
@INPUT : volume
@OUTPUT :
@RETURNS : number of dimensions
@DESCRIPTION: Returns the number of dimensions of the volume
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : June, 1993 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI int get_volume_n_dimensions(
VIO_Volume volume )
{
if( volume )
return( get_multidim_n_dimensions( &volume->array ) );
else
return -1;
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : get_volume_sizes
@INPUT : volume
@OUTPUT : sizes
@RETURNS :
@DESCRIPTION: Passes back the sizes of each of the dimensions. Assumes sizes
has enough room for n_dimensions integers.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : June, 1993 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI void get_volume_sizes(
VIO_Volume volume,
int sizes[] )
{
get_multidim_sizes( &volume->array, sizes );
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : set_volume_sizes
@INPUT : volume
sizes
@OUTPUT :
@RETURNS :
@DESCRIPTION: Sets the sizes (number of voxels in each dimension) of the volume.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : 1993 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI void set_volume_sizes(
VIO_Volume volume,
int sizes[] )
{
set_multidim_sizes( &volume->array, sizes );
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : get_volume_total_n_voxels
@INPUT : volume
@OUTPUT :
@RETURNS : n voxels
@DESCRIPTION: Returns the total number of voxels in the volume.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : 1993 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
VIOAPI size_t get_volume_total_n_voxels(
VIO_Volume volume )
{
size_t n;
int i, sizes[VIO_MAX_DIMENSIONS];
n = 1;
get_volume_sizes( volume, sizes );
for_less( i, 0, get_volume_n_dimensions( volume ) )
n *= (size_t) sizes[i];
return( n );
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : assign_voxel_to_world_transform
@INPUT : volume
transform
@OUTPUT :
@RETURNS :
@DESCRIPTION: Updates the volume's transformation from voxel to world coords.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : May 20, 1997 D. MacDonald - created from
set_voxel_to_world_transform
@MODIFIED :
---------------------------------------------------------------------------- */
static void assign_voxel_to_world_transform(
VIO_Volume volume,
VIO_General_transform *transform )
{
delete_general_transform( &volume->voxel_to_world_transform );
volume->voxel_to_world_transform = *transform;
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : dot_vectors
@INPUT : n
v1
v2
@OUTPUT :
@RETURNS : Dot product
@DESCRIPTION: Computes the dot product of 2 n-dimensional vectors.
This function should be moved to some vector routines.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : 1993 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
static VIO_Real dot_vectors(
int n,
VIO_Real v1[],
VIO_Real v2[] )
{
int i;
VIO_Real d;
d = 0.0;
for_less( i, 0, n )
d += v1[i] * v2[i];
return( d );
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : cross_3D_vector
@INPUT : v1
v2
@OUTPUT : cross
@RETURNS :
@DESCRIPTION: Computes the cross product of 2 n-dimensional vectors.
This function should be moved to some vector routines.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : 1993 David MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
static void cross_3D_vector(
VIO_Real v1[],
VIO_Real v2[],
VIO_Real cross[] )
{
cross[0] = v1[1] * v2[2] - v1[2] * v2[1];
cross[1] = v1[2] * v2[0] - v1[0] * v2[2];
cross[2] = v1[0] * v2[1] - v1[1] * v2[0];
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : normalize_vector
@INPUT : n
v1
@OUTPUT : v1_normalized
@RETURNS :
@DESCRIPTION: Normalizes the length of v1 to 1, placing result in
v1_normalized
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : May 22, 1997 D. MacDonald
@MODIFIED :
---------------------------------------------------------------------------- */
static void normalize_vector(
VIO_Real v1[],
VIO_Real v1_normalized[] )
{
int d;
VIO_Real mag;
mag = dot_vectors( VIO_N_DIMENSIONS, v1, v1 );
if( mag <= 0.0 )
mag = 1.0;
mag = sqrt( mag );
for_less( d, 0, VIO_N_DIMENSIONS )
v1_normalized[d] = v1[d] / mag;
}
/* ----------------------------- MNI Header -----------------------------------
@NAME : compute_world_transform
@INPUT : spatial_axes
separations
translation_voxel
world_space_for_translation_voxel
direction_cosines
@OUTPUT : world_transform
@RETURNS :
@DESCRIPTION: Computes the linear transform from the indices of the spatial
dimensions (spatial_axes), the separations, the translation
(translation_voxel,world_space_for_translation_voxel) and
the direction cosines.
@METHOD :
@GLOBALS :
@CALLS :
@CREATED : 1993 David MacDonald
@MODIFIED : May 22, 1997 D. MacDonald - now uses starts/steps
---------------------------------------------------------------------------- */
VIOAPI void compute_world_transform(
int spatial_axes[VIO_N_DIMENSIONS],
VIO_Real separations[],
VIO_Real direction_cosines[][VIO_N_DIMENSIONS],
VIO_Real starts[],
VIO_General_transform *world_transform )
{
VIO_Transform transform;
VIO_Real separations_3D[VIO_N_DIMENSIONS];
VIO_Real directions[VIO_N_DIMENSIONS][VIO_N_DIMENSIONS];
VIO_Real starts_3D[VIO_N_DIMENSIONS];
VIO_Real normal[VIO_N_DIMENSIONS];
int dim, c, a1, a2, axis, n_axes;
int axis_list[VIO_N_DIMENSIONS];
/*--- find how many direction cosines are specified, and set the
3d separations and starts */
n_axes = 0;
for_less( c, 0, VIO_N_DIMENSIONS )
{
axis = spatial_axes[c];
if( axis >= 0 )