qt5base-lts/tests/auto/gui/painting/qpolygon/tst_qpolygon.cpp

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#include <QtTest/QtTest>

#include <qpolygon.h>
#include <qpainterpath.h>
#include <math.h>

#include <qpainter.h>
#include <qdialog.h>

class tst_QPolygon : public QObject
{
    Q_OBJECT

public:
    tst_QPolygon();

private slots:
    void makeEllipse();
    void swap();
};

tst_QPolygon::tst_QPolygon()
{
}

void tst_QPolygon::makeEllipse()
{
    // create an ellipse with R1 = R2 = R, i.e. a circle
    QPolygon pa;
    const int R = 50; // radius
    QPainterPath path;
    path.addEllipse(0, 0, 2*R, 2*R);
    pa = path.toSubpathPolygons().at(0).toPolygon();

    int i;
    // make sure that all points are R+-1 away from the center
    bool err = false;
    for (i = 1; i < pa.size(); i++) {
	QPoint p = pa.at( i );
	double r = sqrt( pow( double(p.x() - R), 2.0 ) + pow( double(p.y() - R), 2.0 ) );
	// ### too strict ? at least from visual inspection it looks
	// quite odd around the main axes. 2.0 passes easily.
	err |= ( qAbs( r - double(R) ) > 2.0 );
    }
    QVERIFY( !err );
}

void tst_QPolygon::swap()
{
    QPolygon p1(QVector<QPoint>() << QPoint(0,0) << QPoint(10,10) << QPoint(-10,10));
    QPolygon p2(QVector<QPoint>() << QPoint(0,0) << QPoint( 0,10) << QPoint( 10,10) << QPoint(10,0));
    p1.swap(p2);
    QCOMPARE(p1.count(),4);
    QCOMPARE(p2.count(),3);
}

QTEST_APPLESS_MAIN(tst_QPolygon)
#include "tst_qpolygon.moc"