109 lines
4.2 KiB
C++
109 lines
4.2 KiB
C++
#include <doctest/doctest.h>
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#include "fgc/Geometry.h"
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using namespace fgc;
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// Fields in order: counts_per_deg, center_count, deg_at_center, min_deg, max_deg.
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TEST_CASE("AxisMap converts degrees and counts about the anchored centre") {
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AxisMap m{983.33, 500000, 0.0, -90.0, 90.0};
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CHECK(m.toCounts(0.0) == 500000);
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CHECK(m.toCounts(90.0) == 588500); // lround(500000 + 90*983.33)
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CHECK(m.toDeg(500000) == doctest::Approx(0.0));
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CHECK(m.toDeg(m.toCounts(45.0)) == doctest::Approx(45.0).epsilon(0.001));
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}
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TEST_CASE("a non-zero deg_at_center shifts the whole map") {
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// The centre points at 137.4 deg true; everything else follows from that.
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AxisMap m{-529.8, 500000, 137.4, 137.4 - 160.0, 137.4 + 160.0};
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CHECK(m.toCounts(137.4) == 500000);
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CHECK(m.toDeg(500000) == doctest::Approx(137.4));
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// Negative counts_per_deg: a higher heading is a lower count.
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CHECK(m.toCounts(147.4) < 500000);
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CHECK(m.toDeg(m.toCounts(200.0)) == doctest::Approx(200.0).epsilon(0.001));
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}
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TEST_CASE("AxisMap clamps to the soft range on the way out") {
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AxisMap m{10.0, 0, 0.0, -90.0, 90.0};
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CHECK(m.toCounts(200.0) == 900); // clamped to +90
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CHECK(m.toCounts(-200.0) == -900); // clamped to -90
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CHECK(m.toCounts(45.0) == 450);
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}
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TEST_CASE("AxisMap supports a negative (flipped) direction") {
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AxisMap m{-10.0, 1000, 0.0, -90.0, 90.0};
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CHECK(m.toCounts(10.0) == 900);
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CHECK(m.toDeg(900) == doctest::Approx(10.0));
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}
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TEST_CASE("AxisMap toDeg guards against a zero scale") {
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// Degrades to "we are at the centre", not to an unrelated zero.
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AxisMap m{0.0, 0, 42.0, -90.0, 90.0};
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CHECK(m.toDeg(12345) == doctest::Approx(42.0));
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}
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TEST_CASE("wrap360 and wrap180 normalise at and across the boundaries") {
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CHECK(wrap360(0.0) == doctest::Approx(0.0));
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CHECK(wrap360(360.0) == doctest::Approx(0.0));
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CHECK(wrap360(361.0) == doctest::Approx(1.0));
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CHECK(wrap360(-1.0) == doctest::Approx(359.0));
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CHECK(wrap360(-361.0) == doctest::Approx(359.0));
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CHECK(wrap360(180.0) == doctest::Approx(180.0));
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// A tiny negative must land at 0, never at exactly 360.
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CHECK(wrap360(-1e-15) < 360.0);
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CHECK(wrap180(0.0) == doctest::Approx(0.0));
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CHECK(wrap180(179.0) == doctest::Approx(179.0));
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CHECK(wrap180(180.0) == doctest::Approx(-180.0));
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CHECK(wrap180(181.0) == doctest::Approx(-179.0));
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CHECK(wrap180(-179.0) == doctest::Approx(-179.0));
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CHECK(wrap180(359.0) == doctest::Approx(-1.0));
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}
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TEST_CASE("headingDeg reports a compass bearing regardless of the linear degree") {
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// Centre at 350 deg true; +20 deg of travel crosses north.
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AxisMap m{100.0, 500000, 350.0, 350.0 - 160.0, 350.0 + 160.0};
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CHECK(m.headingDeg(500000) == doctest::Approx(350.0));
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// Linear 370 deg is the compass bearing 10 deg.
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CHECK(m.headingDeg(m.toCounts(370.0)) == doctest::Approx(10.0));
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}
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TEST_CASE("headingToCounts reaches across north") {
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AxisMap m{100.0, 500000, 350.0, 350.0 - 160.0, 350.0 + 160.0};
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// 10 deg true is 20 deg past the centre the short way, well inside travel.
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auto c = m.headingToCounts(10.0);
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REQUIRE(c.has_value());
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CHECK(*c == 502000);
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CHECK(m.headingDeg(*c) == doctest::Approx(10.0));
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// And the other way, back past north.
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auto d = m.headingToCounts(330.0);
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REQUIRE(d.has_value());
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CHECK(*d == 498000);
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}
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TEST_CASE("headingToCounts refuses the dead arc instead of clamping to a limit") {
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// 320 deg of travel centred on 0 deg true: reachable is 200..360..160.
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AxisMap m{100.0, 500000, 0.0, -160.0, 160.0};
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CHECK(m.headingToCounts(90.0).has_value());
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CHECK(m.headingToCounts(270.0).has_value()); // == -90, inside
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CHECK(m.headingToCounts(160.0).has_value()); // exactly on the limit
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CHECK_FALSE(m.headingToCounts(180.0).has_value()); // dead centre of the gap
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CHECK_FALSE(m.headingToCounts(170.0).has_value());
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CHECK_FALSE(m.headingToCounts(190.0).has_value());
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// The point of returning nullopt: 180 must NOT come back as the 160 limit.
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CHECK(m.headingToCounts(180.0) != m.headingToCounts(160.0));
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}
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TEST_CASE("headingToCounts refuses a degenerate scale") {
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AxisMap m{0.0, 500000, 0.0, -160.0, 160.0};
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CHECK_FALSE(m.headingToCounts(90.0).has_value());
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}
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