QPoint PolygonPrivate::getPrevPoint(std::vector<QPoint>::const_iterator current) const
{
const int currentY = current->y();
for (auto prev = current;;)
{
if (prev == m_points.begin())
prev = --m_points.end();
else
--prev;
if (prev->y() != currentY)
return *prev;
}
}
QPoint PolygonPrivate::getNextPoint(int& shift, std::vector<QPoint>::const_iterator current) const
{
const int currentY = current->y();
shift = 0;
for (auto next = current;;)
{
++shift;
if (next == --m_points.end())
next = m_points.begin();
else
++next;
if (next->y() != currentY)
return *next;
}
}