/*!
\fn QRegion QMatrix::map(const QRegion ®ion) const
\overload
Creates and returns a QRegion object that is a copy of the given
\a region, mapped into the coordinate system defined by this matrix.
Calling this method can be rather expensive if rotations or
shearing are used.
*/
QRegion QMatrix::map(const QRegion &r) const
{
if (_m11 == 1.0 && _m22 == 1.0 && _m12 == 0.0 && _m21 == 0.0) { // translate or identity
if (_dx == 0.0 && _dy == 0.0) // Identity
return r;
QRegion copy(r);
copy.translate(qRound(_dx), qRound(_dy));
return copy;
}
QPainterPath p = map(qt_regionToPath(r));
return p.toFillPolygon().toPolygon();
}
QT_END_NAMESPACE
#endif
void tst_QRegion::regionToPath()
{
#ifdef QT_BUILD_INTERNAL
QFETCH(QPainterPath, path);
for (int i = 0; i < 360; i += 10) {
QTransform transform;
transform.scale(5, 5);
transform.rotate(i);
QPainterPath mapped = transform.map(path);
QRegion region(mapped.toFillPolygon().toPolygon());
QPainterPath a;
a.addRegion(region);
QPainterPath b = qt_regionToPath(region);
QRect r = a.boundingRect().toAlignedRect();
QImage ia(r.size(), QImage::Format_RGB32);
ia.fill(0xffffffff);
QImage ib = ia;
QPainter p(&ia);
p.translate(-r.x(), -r.y());
p.fillPath(a, Qt::red);
p.end();
p.begin(&ib);
p.translate(-r.x(), -r.y());
p.fillPath(b, Qt::red);
p.end();
QCOMPARE(ia, ib);
QCOMPARE(a.boundingRect(), b.boundingRect());
}
#endif
}
