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//
// test suite for c-api GEOSLineSubstring
#include <tut/tut.hpp>
// geos
#include <geos_c.h>
#include "capi_test_utils.h"
namespace tut {
//
// test group
//
// common data used in test cases.
struct test_capigeoslinesubstring_data : public capitest::utility {
};
typedef test_group<test_capigeoslinesubstring_data> group;
typedef group::object object;
group test_capigeoslinesubstring_group("capi::GEOSLineSubstring");
//
// test cases
//
// basic LineString input
template<>
template<>
void object::test<1>
()
{
input_ = GEOSGeomFromWKT("LINESTRING (0 0, 2 2)");
result_ = GEOSLineSubstring(input_, 0, 0.5);
expected_ = GEOSGeomFromWKT("LINESTRING (0 0, 1 1)");
ensure_geometry_equals(result_, expected_);
}
// MultiLineString also accepted
template<>
template<>
void object::test<2>
()
{
input_ = GEOSGeomFromWKT("MULTILINESTRING((0 0, 0 100),(0 -5, 0 0))");
result_ = GEOSLineSubstring(input_, 0.5, 1);
expected_ = GEOSGeomFromWKT("MULTILINESTRING ((0 52.5, 0 100), (0 -5, 0 0))");
ensure_geometry_equals(result_, expected_);
}
// collapse returns zero-length linestring
template<>
template<>
void object::test<3>
()
{
input_ = GEOSGeomFromWKT("LINESTRING (0 0, 2 2)");
result_ = GEOSLineSubstring(input_, 0.5, 0.5);
expected_ = GEOSGeomFromWKT("LINESTRING (1 1, 1 1)");
ensure_geometry_equals(result_, expected_);
}
// fractions out of range throw an error
template<>
template<>
void object::test<4>
()
{
input_ = GEOSGeomFromWKT("LINESTRING (0 0, 2 2)");
result_ = GEOSLineSubstring(input_, 0.5, 1.5);
ensure(result_ == nullptr);
result_ = GEOSLineSubstring(input_, 0.5, -0.1);
ensure(result_ == nullptr);
}
// Z dimension is interpolated
template<>
template<>
void object::test<5>
()
{
input_ = GEOSGeomFromWKT("LINESTRINGZ (0 0 0, 2 2 5)");
result_ = GEOSLineSubstring(input_, 0, 0.5);
expected_ = GEOSGeomFromWKT("LINESTRING (0 0 0, 1 1 2.5)");
ensure_geometry_equals(result_, expected_);
// check 3rd dimension that isgnored by ensure_geometry_equals
ensure(GEOSHasZ(result_));
auto seq = GEOSGeom_getCoordSeq(expected_);
double z0, z1;
GEOSCoordSeq_getZ(seq, 0, &z0);
GEOSCoordSeq_getZ(seq, 1, &z1);
ensure_equals(z0, 0);
ensure_equals(z1, 2.5);
}
// reversed fractions give a reversed substring
template<>
template<>
void object::test<6>
()
{
input_ = GEOSGeomFromWKT("LINESTRING (0 0, 1 1)");
result_ = GEOSLineSubstring(input_, 0.5, 0);
expected_ = GEOSGeomFromWKT("LINESTRING(0.5 0.5, 0 0)");
ensure_geometry_equals(result_, expected_);
}
template<>
template<>
void object::test<7>()
{
input_ = fromWKT("CIRCULARSTRING (0 0, 1 1, 2 0)");
ensure(input_);
result_ = GEOSLineSubstring(input_, 0.5, 0);
ensure("curved geometries not supported", result_ == nullptr);
}
// NaN start fraction
// https://github.com/libgeos/geos/issues/1077
template<>
template<>
void object::test<8>
()
{
input_ = fromWKT("LINESTRING EMPTY");
double start = std::numeric_limits<double>::quiet_NaN();
double end = 0.1;
result_ = GEOSLineSubstring(input_, start, end);
ensure(result_ == nullptr);
}
template<>
template<>
void object::test<9>
()
{
input_ = fromWKT("POLYGON ((0 0, 1 0, 1 1, 0 0))");
result_ = GEOSLineSubstring(input_, 0.2, 0.3);
ensure(result_ == nullptr);
}
} // namespace tut
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