Visualization::AnchorLayoutConstraintSolver Class Reference

This class can solve the linear program given by a list of elements and anchors. More...

Public Member Functions
	AnchorLayoutConstraintSolver ()
virtual	~AnchorLayoutConstraintSolver ()
void	placeElements (const QVector< FormElement * > &elements, QList< AnchorLayoutAnchor * > &anchors, AnchorLayoutAnchor::Orientation orientation, Item *item)
	Taking a list of elements and a list of anchors, computes the positions along the axis given by orientation for all the elements, relative to the item. More...

Private Member Functions
void	addConstraint (int type, QVector< QPair< int, float >> constraintRow, float result)
void	cleanUpConstraintSolver ()
int	endVariable (int elementIndex)
void	initializeConstraintSolver (int numVariables)
void	prepareLP (const QVector< FormElement * > &elements, QList< AnchorLayoutAnchor * > &anchors, AnchorLayoutAnchor::Orientation orientation, Item *item)
void	setMinimizeObjective (QVector< float > objectiveRow)
QVector< float >	solveConstraints ()
int	startVariable (int elementIndex)
void	updateLP (const QVector< FormElement * > &elements, AnchorLayoutAnchor::Orientation orientation, Item *item)

Private Attributes
int *	columnIndices_ {}
_lprec *	lp_ {}
int	numVariables_ {}
double *	rowValues_ {}

Detailed Description

This class can solve the linear program given by a list of elements and anchors.

That is, it can place elements along an axis, even if there are some circular dependencies involved. This solver is only used, if there are such dependencies along the axis to be handled.

The library used to solve the linear programming problem is lp_solve.

Constructor & Destructor Documentation

AnchorLayoutConstraintSolver()

Visualization::AnchorLayoutConstraintSolver::AnchorLayoutConstraintSolver

(

)

~AnchorLayoutConstraintSolver()

Visualization::AnchorLayoutConstraintSolver::~AnchorLayoutConstraintSolver ( )

virtual

Member Function Documentation

addConstraint()

void Visualization::AnchorLayoutConstraintSolver::addConstraint ( int  type, QVector< QPair< int, float >>  constraintRow, float  result  )

private

cleanUpConstraintSolver()

void Visualization::AnchorLayoutConstraintSolver::cleanUpConstraintSolver ( )

private

endVariable()

int Visualization::AnchorLayoutConstraintSolver::endVariable ( int  elementIndex )

inlineprivate

initializeConstraintSolver()

void Visualization::AnchorLayoutConstraintSolver::initializeConstraintSolver ( int  numVariables )

private

placeElements()

void Visualization::AnchorLayoutConstraintSolver::placeElements	(	const QVector< FormElement * > &	elements,
		QList< AnchorLayoutAnchor * > &	anchors,
		AnchorLayoutAnchor::Orientation	orientation,
		Item *	item
	)

Taking a list of elements and a list of anchors, computes the positions along the axis given by orientation for all the elements, relative to the item.

prepareLP()

void Visualization::AnchorLayoutConstraintSolver::prepareLP ( const QVector< FormElement * > &  elements, QList< AnchorLayoutAnchor * > &  anchors, AnchorLayoutAnchor::Orientation  orientation, Item *  item  )

private

setMinimizeObjective()

void Visualization::AnchorLayoutConstraintSolver::setMinimizeObjective ( QVector< float >  objectiveRow )

private

solveConstraints()

QVector< float > Visualization::AnchorLayoutConstraintSolver::solveConstraints ( )

private

startVariable()

int Visualization::AnchorLayoutConstraintSolver::startVariable ( int  elementIndex )

inlineprivate

updateLP()

void Visualization::AnchorLayoutConstraintSolver::updateLP ( const QVector< FormElement * > &  elements, AnchorLayoutAnchor::Orientation  orientation, Item *  item  )

private

Member Data Documentation

columnIndices_

int* Visualization::AnchorLayoutConstraintSolver::columnIndices_ {}

private

lp_

_lprec* Visualization::AnchorLayoutConstraintSolver::lp_ {}

private

numVariables_

int Visualization::AnchorLayoutConstraintSolver::numVariables_ {}

private

rowValues_

double* Visualization::AnchorLayoutConstraintSolver::rowValues_ {}

private