libcruft-util/test/geom/ellipse.cpp

#include "tap.hpp"

#include "geom/ellipse.hpp"
#include "geom/ray.hpp"
#include "point.hpp"
#include "vector.hpp"

int
main ()
{
    util::TAP::logger tap;

    static struct {
        util::geom::ellipse3f shape;
        util::geom::ray3f caster;
        float distance;
        const char *message;
    } const TESTS[] = {
        {
            .shape  = { .origin = {0}, .radius = {1}, .up = {0,1,0} },
            .caster = { .origin = { 0, 0, -2 }, .direction = util::vector3f{ 0, 0, 1 } },
            .distance = 1,
            .message = "sphere on origin, ray mostly on origin"
        },

        {
            .shape = { .origin = {0}, .radius = {1,1,1.5}, .up = {0,1,0} },
            .caster = { .origin = {0,0,-2}, .direction = util::vector3f{0,0,1} },
            .distance = .5f,
            .message = "ellipse on origin, extended on z, ray along z",
        },

        {
            .shape = { .origin = 1, .radius = 1, .up = { 0, 1, 0 } },
            .caster = { .origin = {1,1,3}, .direction = {0,0,-1} },
            .distance = 1.f,
            .message = "ellipse at 1,1,1, ray along -z",
        }
    };


    for (auto const& t: TESTS) {
        tap.expect_eq (t.distance, distance (t.caster, t.shape), "%s", t.message);
    }

    return tap.status ();
}