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rgeos_misc.c
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rgeos_misc.c
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#include "rgeos.h"
SEXP rgeos_area(SEXP env, SEXP obj, SEXP byid) {
return( rgeos_miscfunc(env, obj, byid, &GEOSArea_r) );
}
SEXP rgeos_length(SEXP env, SEXP obj, SEXP byid) {
return( rgeos_miscfunc(env, obj, byid, &GEOSLength_r) );
}
SEXP rgeos_miscfunc(SEXP env, SEXP obj, SEXP byid, p_miscfunc miscfunc) {
SEXP ans;
GEOSContextHandle_t GEOShandle = getContextHandle(env);
GEOSGeom geom = rgeos_convert_R2geos(env, obj);
int type = GEOSGeomTypeId_r(GEOShandle, geom);
int n = (LOGICAL_POINTER(byid)[0] && type == GEOS_GEOMETRYCOLLECTION) ?
GEOSGetNumGeometries_r(GEOShandle, geom) : 1;
int pc=0;
PROTECT(ans = NEW_NUMERIC(n)); pc++;
GEOSGeom curgeom = geom;
for(int i=0; i<n; i++) {
if ( n > 1) {
curgeom = (GEOSGeom) GEOSGetGeometryN_r(GEOShandle, geom, i);
if (curgeom == NULL) error("rgeos_miscfunc: unable to get subgeometries");
}
double val;
if (!miscfunc(GEOShandle, curgeom, &val))
error("rgeos_miscfunc: unable to calculate");
NUMERIC_POINTER(ans)[i] = val;
}
GEOSGeom_destroy_r(GEOShandle, geom);
UNPROTECT(pc);
return(ans);
}
SEXP rgeos_distance(SEXP env, SEXP spgeom1, SEXP spgeom2, SEXP byid) {
return( rgeos_distancefunc(env, spgeom1, spgeom2, byid, &GEOSDistance_r) );
}
SEXP rgeos_hausdorffdistance(SEXP env, SEXP spgeom1, SEXP spgeom2, SEXP byid) {
return( rgeos_distancefunc(env, spgeom1, spgeom2, byid, &GEOSHausdorffDistance_r) );
}
SEXP rgeos_distancefunc(SEXP env, SEXP spgeom1, SEXP spgeom2, SEXP byid, p_distfunc distfunc) {
GEOSContextHandle_t GEOShandle = getContextHandle(env);
GEOSGeom geom1 = rgeos_convert_R2geos(env, spgeom1);
int type1 = GEOSGeomTypeId_r(GEOShandle, geom1);
GEOSGeom geom2;
int type2;
int sym_ans = FALSE;
if (spgeom2 == R_NilValue) {
sym_ans = TRUE;
geom2 = geom1;
type2 = GEOSGeomTypeId_r(GEOShandle, geom2);
} else {
geom2 = rgeos_convert_R2geos(env, spgeom2);
type2 = GEOSGeomTypeId_r(GEOShandle, geom2);
}
int m = (LOGICAL_POINTER(byid)[0] && type1 == GEOS_GEOMETRYCOLLECTION) ?
GEOSGetNumGeometries_r(GEOShandle, geom1) : 1;
int n = (LOGICAL_POINTER(byid)[1] && type2 == GEOS_GEOMETRYCOLLECTION) ?
GEOSGetNumGeometries_r(GEOShandle, geom2) : 1;
if (m == -1) error("rgeos_distancefunc: invalid number of subgeometries in geometry 1");
if (n == -1) error("rgeos_distancefunc: invalid number of subgeometries in geometry 2");
int pc=0;
SEXP ans;
PROTECT(ans = NEW_NUMERIC(m*n)); pc++;
GEOSGeom curgeom1 = geom1;
GEOSGeom curgeom2 = geom2;
for(int i=0; i<m; i++) {
if ( m > 1) {
curgeom1 = (GEOSGeom) GEOSGetGeometryN_r(GEOShandle, geom1, i);
if (curgeom1 == NULL)
error("rgeos_binpredfunc: unable to get subgeometries from geometry 1");
}
for(int j=0; j<n; j++) {
if(sym_ans && j > i)
break;
if ( n > 1) {
curgeom2 = (GEOSGeom) GEOSGetGeometryN_r(GEOShandle, geom2, j);
if (curgeom2 == NULL)
error("rgeos_binpredfunc: unable to get subgeometries from geometry 2");
}
double dist;
if (!distfunc(GEOShandle, curgeom1, curgeom2, &dist))
error("rgeos_distancefunc: unable to calculate distance");
NUMERIC_POINTER(ans)[n*i+j] = dist;
if (sym_ans) NUMERIC_POINTER(ans)[n*j+i] = dist;
}
}
if (LOGICAL_POINTER(byid)[0] || LOGICAL_POINTER(byid)[1]) {
SEXP dims;
PROTECT(dims = NEW_INTEGER(2)); pc++;
INTEGER_POINTER(dims)[0] = n;
INTEGER_POINTER(dims)[1] = m;
setAttrib(ans, R_DimSymbol, dims);
}
GEOSGeom_destroy_r(GEOShandle, geom1);
if (!sym_ans)
GEOSGeom_destroy_r(GEOShandle, geom2);
UNPROTECT(pc);
return(ans);
}
SEXP rgeos_hausdorffdistancedensify(SEXP env, SEXP spgeom1, SEXP spgeom2, SEXP densifyFrac, SEXP byid) {
return( rgeos_distancedensifyfunc(env, spgeom1, spgeom2, densifyFrac, byid, &GEOSHausdorffDistanceDensify_r) );
}
SEXP rgeos_distancedensifyfunc(SEXP env, SEXP spgeom1, SEXP spgeom2, SEXP densifyFrac, SEXP byid, p_distdenfunc distfunc) {
GEOSContextHandle_t GEOShandle = getContextHandle(env);
GEOSGeom geom1 = rgeos_convert_R2geos(env, spgeom1);
int type1 = GEOSGeomTypeId_r(GEOShandle, geom1);
GEOSGeom geom2;
int type2;
int sym_ans = FALSE;
if (spgeom2 == R_NilValue) {
sym_ans = TRUE;
geom2 = geom1;
type2 = GEOSGeomTypeId_r(GEOShandle, geom2);
} else {
geom2 = rgeos_convert_R2geos(env, spgeom2);
type2 = GEOSGeomTypeId_r(GEOShandle, geom2);
}
int m = (LOGICAL_POINTER(byid)[0] && type1 == GEOS_GEOMETRYCOLLECTION) ?
GEOSGetNumGeometries_r(GEOShandle, geom1) : 1;
int n = (LOGICAL_POINTER(byid)[1] && type2 == GEOS_GEOMETRYCOLLECTION) ?
GEOSGetNumGeometries_r(GEOShandle, geom2) : 1;
if (m == -1) error("rgeos_distancefunc: invalid number of subgeometries in geometry 1");
if (n == -1) error("rgeos_distancefunc: invalid number of subgeometries in geometry 2");
double frac = NUMERIC_POINTER(densifyFrac)[0];
int pc=0;
SEXP ans;
PROTECT(ans = NEW_NUMERIC(m*n)); pc++;
GEOSGeom curgeom1 = geom1;
GEOSGeom curgeom2 = geom2;
for(int i=0; i<m; i++) {
if ( m > 1) {
curgeom1 = (GEOSGeom) GEOSGetGeometryN_r(GEOShandle, geom1, i);
if (curgeom1 == NULL)
error("rgeos_binpredfunc: unable to get subgeometries from geometry 1");
}
for(int j=0; j<n; j++) {
if(sym_ans && j > i)
break;
if ( n > 1) {
curgeom2 = (GEOSGeom) GEOSGetGeometryN_r(GEOShandle, geom2, j);
if (curgeom2 == NULL)
error("rgeos_binpredfunc: unable to get subgeometries from geometry 2");
}
double dist;
if (!distfunc(GEOShandle, curgeom1, curgeom2, frac, &dist))
error("rgeos_distancefunc: unable to calculate distance");
NUMERIC_POINTER(ans)[n*i+j] = dist;
if (sym_ans) NUMERIC_POINTER(ans)[n*j+i] = dist;
}
}
if (n != 1 && m !=1) {
SEXP dims;
PROTECT(dims = NEW_INTEGER(2)); pc++;
INTEGER_POINTER(dims)[0] = n;
INTEGER_POINTER(dims)[1] = m;
setAttrib(ans, R_DimSymbol, dims);
}
GEOSGeom_destroy_r(GEOShandle, geom1);
if (!sym_ans)
GEOSGeom_destroy_r(GEOShandle, geom2);
UNPROTECT(pc);
return(ans);
}
#ifdef HAVE_NEARESTPOINTS
SEXP rgeos_nearestpoints(SEXP env, SEXP spgeom1, SEXP spgeom2) {
GEOSContextHandle_t GEOShandle = getContextHandle(env);
GEOSGeom geom1 = rgeos_convert_R2geos(env, spgeom1);
GEOSGeom geom2 = rgeos_convert_R2geos(env, spgeom2);
// Returns the closest points of the two geometries, 0 on exception.
// The first point comes from geom1 geometry and
// the second point comes from geom2.
GEOSCoordSequence* s = GEOSNearestPoints_r(GEOShandle, geom1, geom2);
SEXP coordmat;
if (s == 0) {
coordmat = R_NilValue;
} else {
coordmat = rgeos_CoordSeq2crdMat(env, s, 0, 0);
}
GEOSCoordSeq_destroy_r(GEOShandle, s);
return(coordmat);
}
#endif