348 lines
8.6 KiB
C++
348 lines
8.6 KiB
C++
#include <cmath>
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#include <sstream>
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#include <gtest/gtest.h>
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#include <wrmath/geom/quaternion.h>
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using namespace std;
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using namespace wr;
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TEST(Quaternion, SelfTest)
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{
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geom::Quaternion_SelfTest();
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}
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TEST(Quaterniond, Addition)
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{
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geom::Quaterniond p(geom::Vector4d {3.0, 1.0, -2.0, 1.0});
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geom::Quaterniond q(geom::Vector4d {2.0, -1.0, 2.0, 3.0});
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geom::Quaterniond expected(geom::Vector4d{5.0, 0.0, 0.0, 4.0});
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EXPECT_EQ(p + q, expected);
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EXPECT_EQ(expected - q, p);
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EXPECT_NE(expected - q, q); // exercise !=
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}
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TEST(Quaterniond, Conjugate)
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{
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geom::Quaterniond p {2.0, 3.0, 4.0, 5.0};
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geom::Quaterniond q {2.0, -3.0, -4.0, -5.0};
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EXPECT_EQ(p.conjugate(), q);
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}
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TEST(Quaterniond, Euler)
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{
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geom::Quaterniond p = geom::quaterniond(geom::Vector3d{5.037992718099102, 6.212303632611285, 1.7056797335843106}, M_PI/4.0);
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geom::Quaterniond q = geom::quaterniond_from_euler(p.euler());
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EXPECT_EQ(p, q);
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}
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TEST(Quaterniond, Identity)
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{
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geom::Quaterniond p {3.0, 1.0, -2.0, 1.0};
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geom::Quaterniond q;
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EXPECT_TRUE(q.isIdentity());
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EXPECT_EQ(p * q, p);
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}
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TEST(Quaterniond, Inverse)
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{
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geom::Quaterniond p {2.0, 3.0, 4.0, 5.0};
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geom::Quaterniond q {0.03704, -0.05556, -0.07407, -0.09259};
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EXPECT_EQ(p.inverse(), q);
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}
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TEST(Quaterniond, Norm)
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{
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geom::Quaterniond p {5.563199889674063, 0.9899139811480784, 9.387110042325054, 6.161341707794767};
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double norm = 12.57016663729933;
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EXPECT_DOUBLE_EQ(p.norm(), norm);
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}
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TEST(Quaterniond, Product)
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{
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geom::Quaterniond p {3.0, 1.0, -2.0, 1.0};
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geom::Quaterniond q {2.0, -1.0, 2.0, 3.0};
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geom::Quaterniond expected {8.0, -9.0, -2.0, 11.0};
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EXPECT_EQ(p * q, expected);
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}
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TEST(Quaterniond, Rotate)
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{
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// This test aims to rotate a vector v using a quaternion.
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// c.f. https://math.stackexchange.com/questions/40164/how-do-you-rotate-a-vector-by-a-unit-quaternion
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// If we assume a standard IMU frame of reference following the
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// right hand rule:
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// + The x axis points toward magnetic north
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// + The y axis points toward magnentic west
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// + The z axis points toward the sky
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// Given a vector pointing due north, rotating by 90º about
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// the y-axis should leave us pointing toward the sky.
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geom::Vector3d v {1.0, 0.0, 0.0}; // a vector pointed north
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geom::Vector3d yAxis {0.0, 1.0, 0.0}; // a vector representing the y axis.
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double angle = M_PI / 2; // 90º rotation
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// A quaternion representing a 90º rotation about the y axis.
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geom::Quaterniond p = geom::quaterniond(yAxis, angle);
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geom::Vector3d vr {0.0, 0.0, 1.0}; // expected rotated vector.
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// A rotation quaternion should be a unit quaternion.
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EXPECT_TRUE(p.isUnitQuaternion());
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EXPECT_EQ(p.rotate(v), vr);
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}
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TEST(Quaterniond, ShortestSLERP)
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{
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// Our starting point is an orientation that is yawed 45° - our
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// orientation is pointed π/4 radians in the X axis.
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geom::Quaterniond p {0.92388, 0.382683, 0, 0};
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// Our ending point is an orientation that is yawed -45° - or
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// pointed -π/4 radians in the X axis.
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geom::Quaterniond q {0.92388, -0.382683, 0, 0};
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// The halfway point should be oriented midway about the X axis. It turns
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// out this is an identity quaternion.
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geom::Quaterniond r;
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EXPECT_EQ(geom::ShortestSLERP(p, q, 0.0), p);
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EXPECT_EQ(geom::ShortestSLERP(p, q, 1.0), q);
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EXPECT_EQ(geom::ShortestSLERP(p, q, 0.5), r);
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}
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TEST(Quaterniond, ShortestSLERP2)
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{
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// Start with an orientation pointing forward, all Euler angles
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// set to 0.
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geom::Quaterniond start {1.0, 0.0, 0.0, 0.0};
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// The goal is to end up face up, or 90º pitch (still facing forward).
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geom::Quaterniond end {0.707107, 0, -0.707107, 0};
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// Halfway to the endpoint should be a 45º pitch.
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geom::Quaterniond halfway {0.92388, 0, -0.382683, 0};
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// 2/3 of the way should be 60º pitch.
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geom::Quaterniond twoThirds {0.866025, 0, -0.5, 0};
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EXPECT_EQ(ShortestSLERP(start, end, 0.0), start);
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EXPECT_EQ(ShortestSLERP(start, end, 1.0), end);
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EXPECT_EQ(ShortestSLERP(start, end, 0.5), halfway);
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EXPECT_EQ(ShortestSLERP(start, end, 2.0/3.0), twoThirds);
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}
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TEST(Quaterniond, Unit)
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{
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geom::Quaterniond q {0.0, 0.5773502691896258, 0.5773502691896258, 0.5773502691896258};
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EXPECT_TRUE(q.isUnitQuaternion());
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}
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TEST(Quaterniond, UtilityCreator)
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{
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geom::Vector3d v {1.0, 1.0, 1.0};
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double w = M_PI;
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geom::Quaterniond p = geom::quaterniond(v, w);
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geom::Quaterniond q {0.0, 0.5773502691896258, 0.5773502691896258, 0.5773502691896258};
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EXPECT_EQ(p, q);
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}
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TEST(Quaternionf, Addition)
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{
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geom::Quaternionf p {3.0, 1.0, -2.0, 1.0};
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geom::Quaternionf q {2.0, -1.0, 2.0, 3.0};
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geom::Quaternionf expected {5.0, 0.0, 0.0, 4.0};
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EXPECT_EQ(p + q, expected);
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EXPECT_EQ(expected - q, p);
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EXPECT_NE(expected - q, q); // exercise !=
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}
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TEST(Quaternionf, Conjugate)
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{
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geom::Quaternionf p {2.0, 3.0, 4.0, 5.0};
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geom::Quaternionf q {2.0, -3.0, -4.0, -5.0};
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EXPECT_EQ(p.conjugate(), q);
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}
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TEST(Quaternionf, Euler)
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{
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geom::Quaternionf p = geom::quaternionf(geom::Vector3f{5.037992718099102, 6.212303632611285, 1.7056797335843106}, M_PI/4.0);
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geom::Quaternionf q = geom::quaternionf_from_euler(p.euler());
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EXPECT_EQ(p, q);
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}
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TEST(Quaternionf, Identity)
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{
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geom::Quaternionf p {1.0, 3.0, 1.0, -2.0};
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geom::Quaternionf q;
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EXPECT_EQ(p * q, p);
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}
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TEST(Quaternionf, Inverse)
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{
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geom::Quaternionf p {2.0, 3.0, 4.0, 5.0};
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geom::Quaternionf q {0.03704, -0.05556, -0.07407, -0.09259};
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EXPECT_EQ(p.inverse(), q);
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}
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TEST(Quaternionf, Norm)
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{
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geom::Quaternionf p {0.9899139811480784, 9.387110042325054, 6.161341707794767, 5.563199889674063};
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float norm = 12.57016663729933;
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EXPECT_FLOAT_EQ(p.norm(), norm);
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}
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TEST(Quaternionf, Product)
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{
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geom::Quaternionf p {3.0, 1.0, -2.0, 1.0};
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geom::Quaternionf q {2.0, -1.0, 2.0, 3.0};
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geom::Quaternionf expected {8.0, -9.0, -2.0, 11.0};
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EXPECT_EQ(p * q, expected);
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}
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TEST(Quaternionf, Rotate)
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{
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geom::Vector3f v {1.0, 0.0, 0.0};
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geom::Vector3f yAxis {0.0, 1.0, 0.0};
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float angle = M_PI / 2;
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geom::Quaternionf p = geom::quaternionf(yAxis, angle);
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geom::Vector3f vr {0.0, 0.0, 1.0};
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EXPECT_TRUE(p.isUnitQuaternion());
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EXPECT_EQ(p.rotate(v), vr);
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}
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TEST(Quaternionf, ShortestSLERP)
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{
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// Our starting point is an orientation that is yawed 45° - our
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// orientation is pointed π/4 radians in the X axis.
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geom::Quaternionf p {0.92388, 0.382683, 0, 0};
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// Our ending point is an orientation that is yawed -45° - or
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// pointed -π/4 radians in the X axis.
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geom::Quaternionf q {0.92388, -0.382683, 0, 0};
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// The halfway point should be oriented midway about the X axis. It turns
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// out this is an identity quaternion.
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geom::Quaternionf r;
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EXPECT_EQ(geom::ShortestSLERP(p, q, (float)0.0), p);
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EXPECT_EQ(geom::ShortestSLERP(p, q, (float)1.0), q);
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EXPECT_EQ(geom::ShortestSLERP(p, q, (float)0.5), r);
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}
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TEST(Quaternionf, ShortestSLERP2)
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{
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// Start with an orientation pointing forward, all Euler angles
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// set to 0.
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geom::Quaternionf start {1.0, 0.0, 0.0, 0.0};
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// The goal is to end up face up, or 90º pitch (still facing forward).
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geom::Quaternionf end {0.707107, 0, -0.707107, 0};
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// Halfway to the endpoint should be a 45º pitch.
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geom::Quaternionf halfway {0.92388, 0, -0.382683, 0};
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// 2/3 of the way should be 60º pitch.
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geom::Quaternionf twoThirds {0.866025, 0, -0.5, 0};
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EXPECT_EQ(ShortestSLERP(start, end, (float)0.0), start);
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EXPECT_EQ(ShortestSLERP(start, end, (float)1.0), end);
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EXPECT_EQ(ShortestSLERP(start, end, (float)0.5), halfway);
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EXPECT_EQ(ShortestSLERP(start, end, (float)(2.0/3.0)), twoThirds);
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}
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TEST(Quaternionf, Unit)
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{
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geom::Quaternionf q {0.0, 0.5773502691896258, 0.5773502691896258, 0.5773502691896258};
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EXPECT_TRUE(q.isUnitQuaternion());
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}
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TEST(Quaternionf, UtilityCreator)
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{
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geom::Vector3f v {1.0, 1.0, 1.0};
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float w = M_PI;
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geom::Quaternionf p = geom::quaternionf(v, w);
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geom::Quaternionf q {0.0, 0.5773502691896258, 0.5773502691896258, 0.5773502691896258};
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EXPECT_EQ(p, q);
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}
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TEST(QuaternionMiscellaneous, SanityChecks)
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{
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geom::Vector4d q {4.0, 1.0, 2.0, 3.0};
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geom::Vector3d v {1.0, 2.0, 3.0};
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double w = 4.0;
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geom::Quaterniond p(q);
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geom::Quaterniond u = p.unitQuaternion();
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EXPECT_EQ(p.axis(), v);
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EXPECT_DOUBLE_EQ(p.angle(), w);
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EXPECT_TRUE(u.isUnitQuaternion());
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}
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TEST(QuaternionMiscellaneous, OutputStream)
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{
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geom::Quaternionf p {4.0, 1.0, 2.0, 3.0};
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geom::Quaterniond q {4.0, 1.0, 2.0, 3.0};
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stringstream ss;
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ss << p;
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EXPECT_EQ(ss.str(), "4 + <1, 2, 3>");
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ss.str("");
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ss << q;
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EXPECT_EQ(ss.str(), "4 + <1, 2, 3>");
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}
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TEST(QuaternionMiscellanous, InitializerConstructor)
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{
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geom::Quaternionf p {1.0, 1.0, 1.0, 1.0};
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geom::Quaternionf q(geom::Vector4f {1.0, 1.0, 1.0, 1.0});
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EXPECT_EQ(p, q);
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EXPECT_FLOAT_EQ(p.norm(), 2.0);
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}
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int
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main(int argc, char **argv)
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{
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::testing::InitGoogleTest(&argc, argv);
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return RUN_ALL_TESTS();
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}
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