mapnik/tests/cxx/geometry_hit_test.cpp

#include "catch.hpp"

#include <mapnik/geometry.hpp>
#include <mapnik/hit_test_filter.hpp>
#include <mapnik/geometry_correct.hpp>

TEST_CASE("geometry ops") {

SECTION("hit_test_filter") {
    using namespace mapnik::geometry;
    {
        geometry geom(point(0,0));
        REQUIRE( mapnik::hit_test(geom,0,0,0) );
    }
    {
        geometry geom(point(0,0));
        REQUIRE( mapnik::hit_test(geom,1,0,1) );
    }
    {
        geometry geom(point(0,0));
        REQUIRE( mapnik::hit_test(geom,0,1,1) );
    }
    {
        geometry geom(point(0,0));
        REQUIRE( mapnik::hit_test(geom,1,1,1.5) );
    }
    {
        line_string line;
        line.add_coord(0,0);
        line.add_coord(1,1);
        line.add_coord(2,2);
        geometry geom(line);
        REQUIRE( mapnik::hit_test(geom,0,0,1.5) );
    }
    {
        line_string line;
        line.add_coord(0,0);
        line.add_coord(1,1);
        line.add_coord(2,2);
        multi_line_string multi_line;
        multi_line.emplace_back(std::move(line));
        geometry geom(multi_line);
        REQUIRE( mapnik::hit_test(geom,0,0,1.5) );
    }
    {
        polygon poly;
        linear_ring ring;
        ring.add_coord(0,0);
        ring.add_coord(-10,0);
        ring.add_coord(-10,10);
        ring.add_coord(0,10);
        ring.add_coord(0,0);
        poly.set_exterior_ring(std::move(ring));
        geometry geom(poly);
        REQUIRE( mapnik::hit_test(geom,-5,5,0) );

        multi_polygon mp;
        mp.push_back(poly);
        geometry geom_mp(mp);
        REQUIRE( mapnik::hit_test(geom_mp,-5,5,0) );

        correct(geom);
        REQUIRE( mapnik::hit_test(geom,-5,5,0) );
        correct(geom_mp);
        REQUIRE( mapnik::hit_test(geom_mp,-5,5,0) );

        geometry_collection gc;
        REQUIRE( !mapnik::hit_test(geometry(gc),-5,5,0) );
        gc.push_back(geom_mp);
        REQUIRE( mapnik::hit_test(geometry(gc),-5,5,0) );
        REQUIRE( !mapnik::hit_test(geometry(gc),-50,-50,0) );
        gc.emplace_back(point(-50,-50));
        REQUIRE( mapnik::hit_test(geometry(gc),-50,-50,0) );
    }

    {
        // polygon with hole
        polygon poly;
        linear_ring ring;
        ring.add_coord(0,0);
        ring.add_coord(-10,0);
        ring.add_coord(-10,10);
        ring.add_coord(0,10);
        ring.add_coord(0,0);
        poly.set_exterior_ring(std::move(ring));
        linear_ring hole;
        hole.add_coord(-7,7);
        hole.add_coord(-7,3);
        hole.add_coord(-3,3);
        hole.add_coord(-3,7);
        hole.add_coord(-7,7);
        poly.add_hole(std::move(hole));
        geometry geom(poly);
        REQUIRE( !mapnik::hit_test(geom,-5,5,0) );
        // add another hole inside the first hole
        // which should be considered a hit
        linear_ring fill;
        fill.add_coord(-6,4);
        fill.add_coord(-6,6);
        fill.add_coord(-4,6);
        fill.add_coord(-4,4);
        fill.add_coord(-6,4);
        poly.add_hole(std::move(fill));
        REQUIRE( mapnik::hit_test(geometry(poly),-5,5,0) );
    }
}

}