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//
// Test Suite for geos::algorithm::distance::DiscreteHausdorffDistance
// Ported from JTS junit/algorithm/distance/DiscreteHausdorffDistanceTest.java rev. 1.2
#include <tut/tut.hpp>
// geos
#include <geos/constants.h>
#include <geos/io/WKTReader.h>
#include <geos/algorithm/distance/DiscreteHausdorffDistance.h>
#include <geos/geom/PrecisionModel.h>
#include <geos/geom/GeometryFactory.h>
#include <geos/geom/Geometry.h> // required for use in unique_ptr
#include <geos/geom/Coordinate.h>
// std
#include <cmath>
#include <string>
#include <memory>
#include <cfenv>
namespace geos {
namespace geom {
class Geometry;
}
}
using namespace geos::geom;
using namespace geos::algorithm::distance; // for Location
namespace tut {
//
// Test Group
//
// Test data, not used
struct test_DiscreteHausdorffDistance_data {
typedef std::unique_ptr<Geometry> GeomPtr;
test_DiscreteHausdorffDistance_data()
:
pm(),
gf(GeometryFactory::create(&pm)),
reader(gf.get())
{}
static const double TOLERANCE;
void
runTest(const std::string& wkt1, const std::string& wkt2,
double expectedDistance)
{
GeomPtr g1(reader.read(wkt1));
GeomPtr g2(reader.read(wkt2));
double distance = DiscreteHausdorffDistance::distance(*g1, *g2);
double diff = std::fabs(distance - expectedDistance);
// std::cerr << "expectedDistance:" << expectedDistance << " actual distance:" << distance << std::endl;
ensure(diff <= TOLERANCE);
}
void
runTest(const std::string& wkt1, const std::string& wkt2,
double densifyFactor, double expectedDistance)
{
GeomPtr g1(reader.read(wkt1));
GeomPtr g2(reader.read(wkt2));
double distance = DiscreteHausdorffDistance::distance(*g1,
*g2, densifyFactor);
double diff = std::fabs(distance - expectedDistance);
// std::cerr << "expectedDistance:" << expectedDistance << " actual distance:" << distance << std::endl;
ensure(diff <= TOLERANCE);
}
PrecisionModel pm;
GeometryFactory::Ptr gf;
geos::io::WKTReader reader;
};
const double test_DiscreteHausdorffDistance_data::TOLERANCE = 0.00001;
typedef test_group<test_DiscreteHausdorffDistance_data> group;
typedef group::object object;
group test_DiscreteHausdorffDistance_group("geos::algorithm::distance::DiscreteHausdorffDistance");
//
// Test Cases
//
// 1 - testLineSegments
template<>
template<>
void object::test<1>
()
{
runTest("LINESTRING (0 0, 2 1)",
"LINESTRING (0 0, 2 0)", 1.0);
// zero densify factor
try {
runTest("LINESTRING (0 0, 2 1)",
"LINESTRING EMPTY", 0.0, 0);
}
catch(const geos::util::IllegalArgumentException& ) {
// We do expect an exception
}
// too big densify factor
try {
runTest("LINESTRING (0 0, 2 1)",
"LINESTRING EMPTY", 1 + 1e-10, 0);
}
catch(const geos::util::IllegalArgumentException& ) {
// We do expect an exception
}
// too small positive densify factor
try {
runTest("LINESTRING (0 0, 2 1)",
"LINESTRING EMPTY", 1e-30, 0);
}
catch(const geos::util::IllegalArgumentException& ) {
// We do expect an exception
}
}
// 2 - testLineSegments2
template<>
template<>
void object::test<2>
()
{
runTest("LINESTRING (0 0, 2 0)",
"LINESTRING (0 1, 1 2, 2 1)", 2.0);
}
// 3 - testLinePoints
template<>
template<>
void object::test<3>
()
{
runTest("LINESTRING (0 0, 2 0)",
"MULTIPOINT ((0 1), (1 0), (2 1))", 1.0);
}
// 4 - testLinesShowingDiscretenessEffect
//
// Shows effects of limiting HD to vertices
// Answer is not true Hausdorff distance.
//
template<>
template<>
void object::test<4>
()
{
runTest("LINESTRING (130 0, 0 0, 0 150)",
"LINESTRING (10 10, 10 150, 130 10)", 14.142135623730951);
// densifying provides accurate HD
runTest("LINESTRING (130 0, 0 0, 0 150)",
"LINESTRING (10 10, 10 150, 130 10)", 0.5, 70.0);
}
// https://github.com/libgeos/geos/issues/569
//
// Segfault in Hausdorff distance with empty geometries
//
template<>
template<>
void object::test<5>
()
{
GeomPtr g1(reader.read("POINT (1 1)"));
GeomPtr g2(reader.read("POINT EMPTY"));
double distance = DiscreteHausdorffDistance::distance(*g1, *g2);
ensure(std::isnan(distance));
}
// https://github.com/libgeos/geos/issues/515
//
// Avoid FE_INVALID floating point errors being raised
//
template<>
template<>
void object::test<6>
()
{
std::feclearexcept(FE_ALL_EXCEPT);
runTest(
"LINESTRING (0 0, 100 0, 10 100, 10 100)",
"LINESTRING (0 100, 0 10, 80 10)", 0.001, 47.89);
ensure("FE_INVALID raised", !std::fetestexcept(FE_INVALID));
}
// Crash on collection with empty components
// https://github.com/libgeos/geos/issues/840
template<>
template<>
void object::test<7>
()
{
auto g1 = reader.read("GEOMETRYCOLLECTION (POINT EMPTY, LINESTRING (0 0, 1 1))");
auto g2 = reader.read("POINT (1 2)");
auto g3 = reader.read("LINESTRING (0 0, 1 1)");
ensure_equals(DiscreteHausdorffDistance::distance(*g1, *g2),
DiscreteHausdorffDistance::distance(*g2, *g3));
}
// see https://github.com/libgeos/geos/issues/987
template<>
template<>
void object::test<8>
()
{
runTest("LINEARRING (0 0, 0 10, 10 10, 10 0, 0 0)",
"LINEARRING (1 1, 1 9, 8 8, 9 1, 1 1)",
2.8284271247461903);
}
} // namespace tut
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