mapnik/test/unit/core/box2d_test.cpp

#include "catch.hpp"

#include <mapnik/coord.hpp>
#include <mapnik/geometry/box2d.hpp>
#include "agg_trans_affine.h"

TEST_CASE("box2d")
{
    SECTION("coord init")
    {
        auto c = mapnik::coord2d(100, 100);

        REQUIRE(c.x == 100);
        REQUIRE(c.y == 100);
    }

    SECTION("coord multiplication")
    {
        auto c = mapnik::coord2d(100, 100);
        c *= 2;

        REQUIRE(c.x == 200);
        REQUIRE(c.y == 200);
    }

    SECTION("envelope init")
    {
        auto e = mapnik::box2d<double>(100, 100, 200, 200);

        REQUIRE(e.contains(100, 100));
        REQUIRE(e.contains(100, 200));
        REQUIRE(e.contains(200, 200));
        REQUIRE(e.contains(200, 100));

        REQUIRE(e.contains(e.center()));

        REQUIRE(!e.contains(99.9, 99.9));
        REQUIRE(!e.contains(99.9, 200.1));
        REQUIRE(!e.contains(200.1, 200.1));
        REQUIRE(!e.contains(200.1, 99.9));

        REQUIRE(e.width() == 100);
        REQUIRE(e.height() == 100);

        REQUIRE(e.minx() == 100);
        REQUIRE(e.miny() == 100);

        REQUIRE(e.maxx() == 200);
        REQUIRE(e.maxy() == 200);

        REQUIRE(e[0] == 100);
        REQUIRE(e[1] == 100);
        REQUIRE(e[2] == 200);
        REQUIRE(e[3] == 200);
        REQUIRE(e[0] == e[-4]);
        REQUIRE(e[1] == e[-3]);
        REQUIRE(e[2] == e[-2]);
        REQUIRE(e[3] == e[-1]);

        auto c = e.center();

        REQUIRE(c.x == 150);
        REQUIRE(c.y == 150);
    }

    SECTION("envelope static init")
    {
        auto e = mapnik::box2d<double>(100, 100, 200, 200);

        mapnik::box2d<double> e1, e2, e3;
        REQUIRE(e1.from_string("100 100 200 200"));
        REQUIRE(e2.from_string("100,100,200,200"));
        REQUIRE(e3.from_string("100 , 100 , 200 , 200"));

        REQUIRE(e == e1);
        REQUIRE(e == e2);
        REQUIRE(e == e3);
    }

    SECTION("envelope multiplication")
    {
        // no width then no impact of multiplication
        {
            auto a = mapnik::box2d<int>(100, 100, 100, 100);
            a *= 5;

            REQUIRE(a.minx() == 100);
            REQUIRE(a.miny() == 100);
            REQUIRE(a.maxx() == 100);
            REQUIRE(a.maxy() == 100);
        }

        {
            auto a = mapnik::box2d<double>(100.0, 100.0, 100.0, 100.0);
            a *= 5;

            REQUIRE(a.minx() == 100);
            REQUIRE(a.miny() == 100);
            REQUIRE(a.maxx() == 100);
            REQUIRE(a.maxy() == 100);
        }

        {
            auto a = mapnik::box2d<double>(100.0, 100.0, 100.001, 100.001);
            a *= 5;

            REQUIRE(a.minx() == Approx(99.9980));
            REQUIRE(a.miny() == Approx(99.9980));
            REQUIRE(a.maxx() == Approx(100.0030));
            REQUIRE(a.maxy() == Approx(100.0030));
        }

        {
            auto e = mapnik::box2d<double>(100, 100, 200, 200);
            e *= 2;

            REQUIRE(e.minx() == 50);
            REQUIRE(e.miny() == 50);
            REQUIRE(e.maxx() == 250);
            REQUIRE(e.maxy() == 250);

            REQUIRE(e.contains(50, 50));
            REQUIRE(e.contains(50, 250));
            REQUIRE(e.contains(250, 250));
            REQUIRE(e.contains(250, 50));

            REQUIRE(!e.contains(49.9, 49.9));
            REQUIRE(!e.contains(49.9, 250.1));
            REQUIRE(!e.contains(250.1, 250.1));
            REQUIRE(!e.contains(250.1, 49.9));

            REQUIRE(e.contains(e.center()));

            REQUIRE(e.width() == 200);
            REQUIRE(e.height() == 200);

            REQUIRE(e.minx() == 50);
            REQUIRE(e.miny() == 50);

            REQUIRE(e.maxx() == 250);
            REQUIRE(e.maxy() == 250);

            auto c = e.center();

            REQUIRE(c.x == 150);
            REQUIRE(c.y == 150);
        }
    }

    SECTION("envelope clipping")
    {
        auto e1 = mapnik::box2d<double>(-180, -90, 180, 90);
        auto e2 = mapnik::box2d<double>(-120, 40, -110, 48);
        e1.clip(e2);
        REQUIRE(e1 == e2);

        // madagascar in merc
        e1 = mapnik::box2d<double>(4772116.5490, -2744395.0631, 5765186.4203, -1609458.0673);
        e2 = mapnik::box2d<double>(5124338.3753, -2240522.1727, 5207501.8621, -2130452.8520);
        e1.clip(e2);
        REQUIRE(e1 == e2);

        // nz in lon/lat
        e1 = mapnik::box2d<double>(163.8062, -47.1897, 179.3628, -33.9069);
        e2 = mapnik::box2d<double>(173.7378, -39.6395, 174.4849, -38.9252);
        e1.clip(e2);
        REQUIRE(e1 == e2);
    }

    SECTION("mapnik::box2d intersects")
    {
        mapnik::box2d<double> b0(0, 0, 100, 100);
        // another box2d
        mapnik::box2d<double> b1(100, 100, 200, 200);
        CHECK(b0.intersects(b1));
        CHECK(b1.intersects(b0));
        mapnik::box2d<double> b2(100.001, 100, 200, 200);
        CHECK(!b0.intersects(b2));
        CHECK(!b2.intersects(b0));
        // coord
        CHECK(b0.intersects(mapnik::coord<double, 2>(100, 100)));
        CHECK(!b0.intersects(mapnik::coord<double, 2>(100.001, 100)));
    }

    SECTION("mapnik::box2d intersect")
    {
        mapnik::box2d<double> b0(0, 0, 100, 100);
        mapnik::box2d<double> b1(100, 100, 200, 200);
        CHECK(b0.intersect(b1) == mapnik::box2d<double>(100, 100, 100, 100));
        CHECK(b1.intersect(b0) == mapnik::box2d<double>(100, 100, 100, 100));
        mapnik::box2d<double> b2(100.001, 100, 200, 200);
        CHECK(b0.intersect(b2) == mapnik::box2d<double>());
        CHECK(b2.intersect(b0) == mapnik::box2d<double>());
    }

    SECTION("mapnik::box2d re_center")
    {
        mapnik::box2d<double> b(0, 0, 100, 100);
        b.re_center(0, 0);
        CHECK(b == mapnik::box2d<double>(-50, -50, 50, 50));
        b.re_center(mapnik::coord2d(50, 50));
        CHECK(b == mapnik::box2d<double>(0, 0, 100, 100));
    }

    SECTION("mapnik::box2d operator+=")
    {
        mapnik::box2d<double> b(0, 0, 50, 50);
        b += mapnik::box2d<double>(100, 100, 200, 200);
        CHECK(b == mapnik::box2d<double>(0, 0, 200, 200));
        b += 100;
        CHECK(b == mapnik::box2d<double>(-100, -100, 300, 300));
    }

    SECTION("mapnik::box2d operator*=  operator=/ ")
    {
        mapnik::box2d<double> b(0, 0, 100, 100);
        b *= 2.0;
        CHECK(b == mapnik::box2d<double>(-50, -50, 150, 150));
        b /= 2.0;
        CHECK(b == mapnik::box2d<double>(0, 0, 100, 100));

        agg::trans_affine tr;
        tr.translate(-50, -50);
        tr.scale(2.0);
        b *= tr;
        CHECK(b == mapnik::box2d<double>(-100, -100, 100, 100));
    }
} // TEST_CASE