bool LuRatio(void)
{ bool ok = true;
size_t n = 2; // number rows in A
double ratio;
// values for independent and dependent variables
CPPAD_TEST_VECTOR<double> x(n*n), y(n*n+1);
// pivot vectors
CPPAD_TEST_VECTOR<size_t> ip(n), jp(n);
// set x equal to the identity matrix
x[0] = 1.; x[1] = 0;
x[2] = 0.; x[3] = 1.;
// create a fnction object corresponding to this value of x
CppAD::ADFun<double> *FunPtr = NewFactor(n, x, ok, ip, jp);
// use function object to factor matrix
y = FunPtr->Forward(0, x);
ratio = y[n*n];
ok &= (ratio == 1.);
ok &= CheckLuFactor(n, x, y, ip, jp);
// set x so that the pivot ratio will be infinite
x[0] = 0. ; x[1] = 1.;
x[2] = 1. ; x[3] = 0.;
// try to use old function pointer to factor matrix
y = FunPtr->Forward(0, x);
ratio = y[n*n];
// check to see if we need to refactor matrix
ok &= (ratio > 10.);
if( ratio > 10. )
{ delete FunPtr; // to avoid a memory leak
FunPtr = NewFactor(n, x, ok, ip, jp);
}
// now we can use the function object to factor matrix
y = FunPtr->Forward(0, x);
ratio = y[n*n];
ok &= (ratio == 1.);
ok &= CheckLuFactor(n, x, y, ip, jp);
delete FunPtr; // avoid memory leak
return ok;
}
/**
* @brief scrollingTime call each time when need handle scrolling.
* @param x value from 0.0 to 1.0
*/
void VMainGraphicsView::scrollingTime(qreal x)
{
Q_UNUSED(x);
qreal factor = 1.0;
if (_numScheduledScalings < 0)
{
verticalScrollBar()->setValue(qRound(verticalScrollBar()->value() + factor*3.5));
emit NewFactor(factor);
}
else
{
// if (verticalScrollBar()->value() > 0)
// {
verticalScrollBar()->setValue(qRound(verticalScrollBar()->value() - factor*3.5));
emit NewFactor(factor);
// }
}
}
/**
* @brief scalingTime call each time when need handle scaling.
* @param x value from 0.0 to 1.0
*/
void VMainGraphicsView::scalingTime(qreal x)
{
Q_UNUSED(x);
const QPointF p0scene = mapToScene(mapFromGlobal(QCursor::pos()));
qreal factor = 1.0 + static_cast<qreal>(_numScheduledScalings) / 50.0;
scale(factor, factor);
const QPointF p1mouse = mapFromScene(p0scene);
const QPointF move = p1mouse - this->mapFromGlobal(QCursor::pos()); // The move
horizontalScrollBar()->setValue(static_cast<qint32>(move.x()) + horizontalScrollBar()->value());
verticalScrollBar()->setValue(static_cast<qint32>(move.y()) + verticalScrollBar()->value());
VAbstractTool::NewSceneRect(this->scene(), this);
emit NewFactor(factor);
}
//---------------------------------------------------------------------------------------------------------------------
void VMainGraphicsView::ZoomOut()
{
scale(1.0/1.1, 1.0/1.1);
VAbstractTool::NewSceneRect(this->scene(), this);
emit NewFactor(1.0/1.1);
}
