polardbxengine/unittest/gunit/gis_test_geom.h

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#ifndef UNITTEST_GUNIT_GIS_TEST_GEOM_H_INCLUDED
#define UNITTEST_GUNIT_GIS_TEST_GEOM_H_INCLUDED

#include <cmath>  // M_PI, M_PI_2

#include "sql/gis/geometries_cs.h"  // gis::{Cartesian,Geographic}*

// Header-only definitions of sample geometries useful for testing
// Note that the internal point representation for geographic coordinates is
// (eastwards (-pi, pi], northwards [pi/2, pi/2]) in radians.

namespace {
namespace test_geom {

using Cpt = gis::Cartesian_point;
using Cls = gis::Cartesian_linestring;
using Cgc = gis::Cartesian_geometrycollection;
using Gpt = gis::Geographic_point;
using Gls = gis::Geographic_linestring;
using Ggc = gis::Geographic_geometrycollection;

inline Cpt point_origin() { return {0.0, 0.0}; }

inline Cls linestring_line() {
  // Slanted line
  Cls ls;
  ls.push_back(Cpt{-1, -1});
  ls.push_back(Cpt{+1, +1});
  return ls;
}

inline Cls linestring_right_angle() {
  // _|-shape
  Cls ls;
  ls.push_back(Cpt{-1, -1});
  ls.push_back(Cpt{+1, -1});
  ls.push_back(Cpt{+1, +1});
  return ls;
}

inline Cls linestring_triangle() {
  // Closed _|-shape
  Cls ls;
  ls.push_back(Cpt{-1, -1});
  ls.push_back(Cpt{+1, -1});
  ls.push_back(Cpt{+1, +1});
  ls.push_back(Cpt{-1, -1});
  return ls;
}

inline Cls linestring_selfintersecting() {
  // Open bow / fish-shape, like: ><|
  Cls ls;
  ls.push_back(Cpt{-1, +1});
  ls.push_back(Cpt{+1, -1});
  ls.push_back(Cpt{+1, +1});
  ls.push_back(Cpt{-1, -1});
  return ls;
}

inline Cls linestring_selfintersecting_closed() {
  // Bow-shape, like |><|
  Cls ls;
  ls.push_back(Cpt{-1, +1});
  ls.push_back(Cpt{+1, -1});
  ls.push_back(Cpt{+1, +1});
  ls.push_back(Cpt{-1, -1});
  ls.push_back(Cpt{-1, +1});
  return ls;
}

inline Cls linestring_selftangential() {
  Cls ls;
  ls.push_back(Cpt{-1.0, -0.75});
  ls.push_back(Cpt{+1.0, -0.75});
  ls.push_back(Cpt{+0.0, +0.00});  // Tangent point
  ls.push_back(Cpt{+0.5, -0.50});
  ls.push_back(Cpt{-0.5, -0.50});  // Tangent line
  ls.push_back(Cpt{+0.5, +0.50});  // Touch at midpoint
  ls.push_back(Cpt{-1.0, -0.75});
  return ls;
}

inline Gls linestring_pole_alias() {
  // Line between two coordinates both mapping to the north-pole
  Gls ls;
  ls.push_back(Gpt{0, M_PI_2});
  ls.push_back(Gpt{1, M_PI_2});
  return ls;
}

inline Cgc geometrycollection_empty() { return {}; }

inline Cgc geometrycollection_crossintersecting() {
  Cgc gc;
  {
    Cls ls;
    ls.push_back(Cpt{-1, -1});
    ls.push_back(Cpt{+1, +1});
    gc.push_back(ls);
  }
  {
    Cls ls;
    ls.push_back(Cpt{-1, +1});
    ls.push_back(Cpt{+1, -1});
    gc.push_back(ls);
  }
  return gc;
}

inline Cgc geometrycollection_subintersecting() {
  Cgc gc;
  gc.push_back(linestring_selfintersecting());
  return gc;
}

inline Ggc bug26495068() {
  // Regression test for Bug#26495068
  // Certain geometries crossing the anti-meridian give incorrect results.
  auto deg = [](double x) { return x * M_PI / 180; };
  Ggc gc;
  {
    Gls ls;
    ls.push_back(Gpt{deg(135), deg(0)});
    ls.push_back(Gpt{deg(-150), deg(36)});
    gc.push_back(ls);
  }
  {
    Gls ls;
    ls.push_back(Gpt{deg(-101), deg(0)});
    ls.push_back(Gpt{deg(-178), deg(30)});
    gc.push_back(ls);
  }
  return gc;
}

}  // namespace test_geom
}  // namespace

#endif  // include guard