73 lines
2.8 KiB
C++
73 lines
2.8 KiB
C++
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// SPDX-License-Identifier: LGPL-3.0-or-later
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#include <algorithm>
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#include <catch2/catch_test_macros.hpp>
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#include <catch2/generators/catch_generators.hpp>
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#include <catch2/generators/catch_generators_adapters.hpp>
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#include <catch2/generators/catch_generators_random.hpp>
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#include "util.h"
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TEST_CASE("Transform Mirror") {
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// elementary operations
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REQUIRE(transform(TRANSFORM_MIRROR_X, 10, 20) == std::make_pair(10, -20));
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REQUIRE(transform(TRANSFORM_MIRROR_Y, 10, 20) == std::make_pair(-10, 20));
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// composite operations
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REQUIRE(transform(TRANSFORM_MIRROR_X | TRANSFORM_MIRROR_Y, 10, 20) ==
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std::make_pair(-10, -20));
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}
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TEST_CASE("Transform Rotate") {
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REQUIRE(transform(TRANSFORM_ROTATE_CW, 10, 20) ==
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std::make_pair(-20, 10)); // 4th quadrant
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REQUIRE(transform(TRANSFORM_ROTATE_CW, -20, 10) ==
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std::make_pair(-10, -20)); // 3rd quadrant
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REQUIRE(transform(TRANSFORM_ROTATE_CW, -10, -20) ==
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std::make_pair(20, -10)); // 2nd quadrant
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REQUIRE(transform(TRANSFORM_ROTATE_CW, 20, -10) ==
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std::make_pair(10, 20)); // 1st quadrant
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REQUIRE(transform(TRANSFORM_ROTATE_CCW, 20, -10) ==
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std::make_pair(-10, -20)); // 1nd quadrant
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REQUIRE(transform(TRANSFORM_ROTATE_CCW, -10, -20) ==
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std::make_pair(-20, 10)); // 2rd quadrant
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REQUIRE(transform(TRANSFORM_ROTATE_CCW, -20, 10) ==
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std::make_pair(10, 20)); // 3th quadrant
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REQUIRE(transform(TRANSFORM_ROTATE_CCW, 10, 20) ==
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std::make_pair(20, -10)); // 4st quadrant
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}
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TEST_CASE("Transform Rotate + Mirror") {
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REQUIRE(transform(TRANSFORM_ROTATE_CW | TRANSFORM_MIRROR_X, 10, 20) ==
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std::make_pair(-20, -10));
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REQUIRE(transform(TRANSFORM_ROTATE_CW | TRANSFORM_MIRROR_Y, 10, 20) ==
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std::make_pair(20, 10));
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REQUIRE(
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transform(TRANSFORM_ROTATE_CW | TRANSFORM_MIRROR_X | TRANSFORM_MIRROR_Y,
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10, 20) == std::make_pair(20, -10));
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REQUIRE(transform(TRANSFORM_ROTATE_CCW | TRANSFORM_MIRROR_X, 10, 20) ==
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std::make_pair(20, 10));
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REQUIRE(transform(TRANSFORM_ROTATE_CCW | TRANSFORM_MIRROR_Y, 10, 20) ==
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std::make_pair(-20, -10));
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REQUIRE(
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transform(TRANSFORM_ROTATE_CCW | TRANSFORM_MIRROR_X | TRANSFORM_MIRROR_Y,
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10, 20) == std::make_pair(-20, 10));
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}
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TEST_CASE("Transform = Inverse Transform ○ Transform") {
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int x = GENERATE(take(10, random(-100, 100)));
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int y = GENERATE(take(10, random(-100, 100)));
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// this iterates over all possible transformations,
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// even bogus ones (like rotating cw and ccw)
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for (Transformation transformation = 0; transformation < 0b10000;
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transformation++) {
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int xt, yt;
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std::tie(xt, yt) = transform(transformation, x, y);
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int xti, yti;
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std::tie(xti, yti) = transform_inv(transformation, xt, yt);
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REQUIRE(x == xti);
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REQUIRE(y == yti);
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}
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}
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