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#include <QtTest/QtTest>

#include <qgraphicsitem.h>

#include <qgraphicstransform.h>

#include "../../shared/util.h"

class tst_QGraphicsTransform : public QObject {

    Q_OBJECT

public slots:

    void initTestCase();

    void cleanupTestCase();

    void init();

    void cleanup();

private slots:

    void scale();

    void rotation();

    void rotation3d_data();

    void rotation3d();

};

// This will be called before the first test function is executed.

// It is only called once.

void tst_QGraphicsTransform::initTestCase()

{

}

// This will be called after the last test function is executed.

// It is only called once.

void tst_QGraphicsTransform::cleanupTestCase()

{

}

// This will be called before each test function is executed.

void tst_QGraphicsTransform::init()

{

}

// This will be called after every test function.

void tst_QGraphicsTransform::cleanup()

{

}

static QTransform transform2D(const QGraphicsTransform& t)

{

    QMatrix4x4 m;

    t.applyTo(&m);

    return m.toTransform(0);

}

void tst_QGraphicsTransform::scale()

{

    QGraphicsScale scale;

    // check initial conditions

    QCOMPARE(scale.xScale(), qreal(1));

    QCOMPARE(scale.yScale(), qreal(1));

    QCOMPARE(scale.zScale(), qreal(1));

    QCOMPARE(scale.origin(), QVector3D(0, 0, 0));

    scale.setOrigin(QVector3D(10, 10, 0));

    QCOMPARE(scale.xScale(), qreal(1));

    QCOMPARE(scale.yScale(), qreal(1));

    QCOMPARE(scale.zScale(), qreal(1));

    QCOMPARE(scale.origin(), QVector3D(10, 10, 0));

    QMatrix4x4 t;

    scale.applyTo(&t);

    QCOMPARE(t, QMatrix4x4());

    QCOMPARE(transform2D(scale), QTransform());

    scale.setXScale(10);

    scale.setOrigin(QVector3D(0, 0, 0));

    QCOMPARE(scale.xScale(), qreal(10));

    QCOMPARE(scale.yScale(), qreal(1));

    QCOMPARE(scale.zScale(), qreal(1));

    QCOMPARE(scale.origin(), QVector3D(0, 0, 0));

    QTransform res;

    res.scale(10, 1);

    QCOMPARE(transform2D(scale), res);

    QCOMPARE(transform2D(scale).map(QPointF(10, 10)), QPointF(100, 10));

    scale.setOrigin(QVector3D(10, 10, 0));

    QCOMPARE(transform2D(scale).map(QPointF(10, 10)), QPointF(10, 10));

    QCOMPARE(transform2D(scale).map(QPointF(11, 10)), QPointF(20, 10));

    scale.setYScale(2);

    scale.setZScale(4.5);

    scale.setOrigin(QVector3D(1, 2, 3));

    QCOMPARE(scale.xScale(), qreal(10));

    QCOMPARE(scale.yScale(), qreal(2));

    QCOMPARE(scale.zScale(), qreal(4.5));

    QCOMPARE(scale.origin(), QVector3D(1, 2, 3));

    QMatrix4x4 t2;

    scale.applyTo(&t2);

    QCOMPARE(t2.map(QVector3D(4, 5, 6)), QVector3D(31, 8, 16.5));

    // Because the origin has a non-zero z, mapping (4, 5) in 2D

    // will introduce a projective component into the result.

    QTransform t3 = t2.toTransform();

    QCOMPARE(t3.map(QPointF(4, 5)), QPointF(31 / t3.m33(), 8 / t3.m33()));

}

// QMatrix4x4 uses float internally, whereas QTransform uses qreal.

// This can lead to issues with qFuzzyCompare() where it uses double

// precision to compare values that have no more than float precision

// after conversion from QMatrix4x4 to QTransform.  The following

// definitions correct for the difference.

static inline bool fuzzyCompare(qreal p1, qreal p2)

{

    // increase delta on small machines using float instead of double

    if (sizeof(qreal) == sizeof(float))

        return (qAbs(p1 - p2) <= 0.00002f * qMin(qAbs(p1), qAbs(p2)));

    else

        return (qAbs(p1 - p2) <= 0.00001f * qMin(qAbs(p1), qAbs(p2)));

}

static bool fuzzyCompare(const QTransform& t1, const QTransform& t2)

{

    return fuzzyCompare(t1.m11(), t2.m11()) &&

           fuzzyCompare(t1.m12(), t2.m12()) &&

           fuzzyCompare(t1.m13(), t2.m13()) &&

           fuzzyCompare(t1.m21(), t2.m21()) &&

           fuzzyCompare(t1.m22(), t2.m22()) &&

           fuzzyCompare(t1.m23(), t2.m23()) &&

           fuzzyCompare(t1.m31(), t2.m31()) &&

           fuzzyCompare(t1.m32(), t2.m32()) &&

           fuzzyCompare(t1.m33(), t2.m33());

}

void tst_QGraphicsTransform::rotation()

{

    QGraphicsRotation rotation;

    QCOMPARE(rotation.axis(), QVector3D(0, 0, 1));

    QCOMPARE(rotation.origin(), QVector3D(0, 0, 0));

    QCOMPARE(rotation.angle(), (qreal)0);

    rotation.setOrigin(QVector3D(10, 10, 0));

    QCOMPARE(rotation.axis(), QVector3D(0, 0, 1));

    QCOMPARE(rotation.origin(), QVector3D(10, 10, 0));

    QCOMPARE(rotation.angle(), (qreal)0);

    QMatrix4x4 t;

    rotation.applyTo(&t);

    QCOMPARE(t, QMatrix4x4());

    QCOMPARE(transform2D(rotation), QTransform());

    rotation.setAngle(40);

    rotation.setOrigin(QVector3D(0, 0, 0));

    QCOMPARE(rotation.axis(), QVector3D(0, 0, 1));

    QCOMPARE(rotation.origin(), QVector3D(0, 0, 0));

    QCOMPARE(rotation.angle(), (qreal)40);

    QTransform res;

    res.rotate(40);

    QVERIFY(fuzzyCompare(transform2D(rotation), res));

    rotation.setOrigin(QVector3D(10, 10, 0));

    rotation.setAngle(90);

    QCOMPARE(transform2D(rotation).map(QPointF(10, 10)), QPointF(10, 10));

    QCOMPARE(transform2D(rotation).map(QPointF(20, 10)), QPointF(10, 20));

}

Q_DECLARE_METATYPE(Qt::Axis);

void tst_QGraphicsTransform::rotation3d_data()

{

    QTest::addColumn<Qt::Axis>("axis");

    QTest::addColumn<qreal>("angle");

    for (int angle = 0; angle <= 360; angle++) {

        QTest::newRow("test rotation on X") << Qt::XAxis << qreal(angle);

        QTest::newRow("test rotation on Y") << Qt::YAxis << qreal(angle);

        QTest::newRow("test rotation on Z") << Qt::ZAxis << qreal(angle);

    }

}

void tst_QGraphicsTransform::rotation3d()

{

    QFETCH(Qt::Axis, axis);

    QFETCH(qreal, angle);

    QGraphicsRotation rotation;

    rotation.setAxis(axis);

    QMatrix4x4 t;

    rotation.applyTo(&t);

    QVERIFY(t.isIdentity());

    QVERIFY(transform2D(rotation).isIdentity());

    rotation.setAngle(angle);

    // QGraphicsRotation uses a correct mathematical rotation in 3D.

    // QTransform's Qt::YAxis rotation is inverted from the mathematical

    // version of rotation.  We correct for that here.

    QTransform expected;

    if (axis == Qt::YAxis && angle != 180.)

        expected.rotate(-angle, axis);

    else

        expected.rotate(angle, axis);

    QVERIFY(fuzzyCompare(transform2D(rotation), expected));

    //now let's check that a null vector will not change the transform

    rotation.setAxis(QVector3D(0, 0, 0));

    rotation.setOrigin(QVector3D(10, 10, 0));

    t.setIdentity();

    rotation.applyTo(&t);

    QVERIFY(t.isIdentity());

    QVERIFY(transform2D(rotation).isIdentity());

    rotation.setAngle(angle);

    QVERIFY(t.isIdentity());

    QVERIFY(transform2D(rotation).isIdentity());

    rotation.setOrigin(QVector3D(0, 0, 0));

    QVERIFY(t.isIdentity());

    QVERIFY(transform2D(rotation).isIdentity());

}

QTEST_MAIN(tst_QGraphicsTransform)

#include "tst_qgraphicstransform.moc"