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/***********************************************************************
Axis order operation for use with transformation pipelines.
Kristian Evers, kreve@sdfe.dk, 2017-10-31
************************************************************************
Change the order and sign of 2,3 or 4 axes. Each of the possible four
axes are numbered with 1-4, such that the first input axis is 1, the
second is 2 and so on. The output ordering is controlled by a list of the
input axes re-ordered to the new mapping. Examples:
Reversing the order of the axes:
+proj=axisswap +order=4,3,2,1
Swapping the first two axes (x and y):
+proj=axisswap +order=2,1,3,4
The direction, or sign, of an axis can be changed by adding a minus in
front of the axis-number:
+proj=axisswap +order=1,-2,3,4
It is only necessary to specify the axes that are affected by the swap
operation:
+proj=axisswap +order=2,1
************************************************************************
* Copyright (c) 2017, Kristian Evers / SDFE
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
***********************************************************************/
#define PJ_LIB__
#include <errno.h>
#include "proj_internal.h"
#include "projects.h"
PROJ_HEAD(axisswap, "Axis ordering");
struct pj_opaque {
unsigned int axis[4];
int sign[4];
};
static int sign(int x) {
return (x > 0) - (x < 0);
}
static XY forward_2d(LP lp, PJ *P) {
struct pj_opaque *Q = (struct pj_opaque *) P->opaque;
unsigned int i;
PJ_COORD out, in;
in.lp = lp;
out = proj_coord_error();
for (i=0; i<2; i++)
out.v[i] = in.v[Q->axis[i]] * Q->sign[i];
return out.xy;
}
static LP reverse_2d(XY xy, PJ *P) {
struct pj_opaque *Q = (struct pj_opaque *) P->opaque;
unsigned int i;
PJ_COORD out, in;
in.xy = xy;
out = proj_coord_error();
for (i=0; i<2; i++)
out.v[Q->axis[i]] = in.v[i] * Q->sign[i];
return out.lp;
}
static XYZ forward_3d(LPZ lpz, PJ *P) {
struct pj_opaque *Q = (struct pj_opaque *) P->opaque;
unsigned int i;
PJ_COORD out, in;
in.lpz = lpz;
out = proj_coord_error();
for (i=0; i<3; i++)
out.v[i] = in.v[Q->axis[i]] * Q->sign[i];
return out.xyz;
}
static LPZ reverse_3d(XYZ xyz, PJ *P) {
struct pj_opaque *Q = (struct pj_opaque *) P->opaque;
unsigned int i;
PJ_COORD in, out;
out = proj_coord_error();
in.xyz = xyz;
for (i=0; i<3; i++)
out.v[Q->axis[i]] = in.v[i] * Q->sign[i];
return out.lpz;
}
static PJ_COORD forward_4d(PJ_COORD coo, PJ *P) {
struct pj_opaque *Q = (struct pj_opaque *) P->opaque;
unsigned int i;
PJ_COORD out;
out = proj_coord_error();
for (i=0; i<4; i++)
out.v[i] = coo.v[Q->axis[i]] * Q->sign[i];
return out;
}
static PJ_COORD reverse_4d(PJ_COORD coo, PJ *P) {
struct pj_opaque *Q = (struct pj_opaque *) P->opaque;
unsigned int i;
PJ_COORD out;
out = proj_coord_error();
for (i=0; i<4; i++)
out.v[Q->axis[i]] = coo.v[i] * Q->sign[i];
return out;
}
/***********************************************************************/
PJ *CONVERSION(axisswap,0) {
/***********************************************************************/
struct pj_opaque *Q = pj_calloc (1, sizeof (struct pj_opaque));
char *order, *s;
unsigned int i, j, n;
if (0==Q)
return pj_default_destructor (P, ENOMEM);
P->opaque = (void *) Q;
/* read axis order */
if (pj_param (P->ctx, P->params, "torder").i) {
order = pj_param(P->ctx, P->params, "sorder").s;
} else {
return pj_default_destructor(P, PJD_ERR_MISSING_ARGS);
}
/* fill axis list with indices from 4-7 to simplify duplicate search further down */
for (i=0; i<4; i++)
Q->axis[i] = i+4;
/* check that all characters are valid */
for (i=0; i<strlen(order); i++)
if (strchr("1234-,", order[i]) == 0) {
proj_log_error(P, "axisswap: unknown axis '%c'", order[i]);
return pj_default_destructor(P, PJD_ERR_AXIS);
}
/* read axes numbers and signs */
for ( s = order, n = 0; *s != '\0' && n < 4; ) {
Q->axis[n] = abs(atoi(s))-1;
Q->sign[n++] = sign(atoi(s));
while ( *s != '\0' && *s != ',' )
s++;
if ( *s == ',' )
s++;
}
/* check for duplicate axes */
for (i=0; i<4; i++)
for (j=0; j<4; j++) {
if (i==j)
continue;
if (Q->axis[i] == Q->axis[j]) {
proj_log_error(P, "swapaxis: duplicate axes specified");
return pj_default_destructor(P, PJD_ERR_AXIS);
}
}
/* only map fwd/inv functions that are possible with the given axis setup */
if (n == 4) {
P->fwd4d = forward_4d;
P->inv4d = reverse_4d;
}
if (n == 3 && Q->axis[0] < 3 && Q->axis[1] < 3 && Q->axis[2] < 3) {
P->fwd3d = forward_3d;
P->inv3d = reverse_3d;
}
if (n == 2 && Q->axis[0] < 2 && Q->axis[1] < 2) {
P->fwd = forward_2d;
P->inv = reverse_2d;
}
if (P->fwd4d == NULL && P->fwd3d == NULL && P->fwd == NULL) {
proj_log_error(P, "swapaxis: bad axis order");
return pj_default_destructor(P, PJD_ERR_AXIS);
}
if (pj_param(P->ctx, P->params, "tangularunits").i) {
P->left = PJ_IO_UNITS_RADIANS;
P->right = PJ_IO_UNITS_RADIANS;
} else {
P->left = PJ_IO_UNITS_METERS;
P->right = PJ_IO_UNITS_METERS;
}
return P;
}
int pj_axisswap_selftest (void) {return 10000;}
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