QSimplexConstraint Struct Reference

#include <qsimplex_p.h>

Public Types
enum	Ratio { LessOrEqual = 0, Equal, MoreOrEqual }

Public Functions
void	invert ()
bool	isSatisfied ()
	QSimplexConstraint ()
QString	toString ()

Public Variables
QSimplexVariable *	artificial
qreal	constant
QPair< QSimplexVariable *, qreal >	helper
Ratio	ratio
QHash< QSimplexVariable *, qreal >	variables

Detailed Description

Warning

This function is not part of the public interface.

Representation of a LP constraint like:

(c1 * X1) + (c2 * X2) + ... = K or <= K or >= K

Where (ci, Xi) are the pairs in "variables" and K the real "constant".

Definition at line 81 of file qsimplex_p.h.

Enumerations

Ratio

enum QSimplexConstraint::Ratio

Enumerator
LessOrEqual
Equal
MoreOrEqual

Definition at line 85 of file qsimplex_p.h.

               {
        LessOrEqual = 0,
        Equal,
        MoreOrEqual
    };

Constructors and Destructors

QSimplexConstraint()

QSimplexConstraint::QSimplexConstraint ( )

inline

Definition at line 83 of file qsimplex_p.h.

: constant(0), ratio(Equal), artificial(0) {}

Functions

invert()

void QSimplexConstraint::invert

(

)

Definition at line 692 of file qsimplex_p.cpp.

Referenced by QSimplex::simplifyConstraints().

{
    constant = -constant;
    ratio = Ratio(2 - ratio);

    QHash<QSimplexVariable *, qreal>::iterator iter;
    for (iter = variables.begin(); iter != variables.end(); ++iter) {
        iter.value() = -iter.value();
    }
}

isSatisfied()

bool QSimplexConstraint::isSatisfied ( )

inline

Definition at line 100 of file qsimplex_p.h.

Referenced by QSimplex::simplifyConstraints().

                       {
        qreal leftHandSide(0);

        QHash<QSimplexVariable *, qreal>::const_iterator iter;
        for (iter = variables.constBegin(); iter != variables.constEnd(); ++iter) {
            leftHandSide += iter.value() * iter.key()->result;
        }

        Q_ASSERT(constant > 0 || qFuzzyCompare(1, 1 + constant));

        if ((leftHandSide == constant) || qAbs(leftHandSide - constant) < 0.0000001)
            return true;

        switch (ratio) {
        case LessOrEqual:
            return leftHandSide < constant;
        case MoreOrEqual:
            return leftHandSide > constant;
        default:
            return false;
        }
    }

toString()

QString QSimplexConstraint::toString ( )

inline

Definition at line 124 of file qsimplex_p.h.

                       {
        QString result;
        result += QString::fromAscii("-- QSimplexConstraint %1 --").arg(quintptr(this), 0, 16);

        QHash<QSimplexVariable *, qreal>::const_iterator iter;
        for (iter = variables.constBegin(); iter != variables.constEnd(); ++iter) {
            result += QString::fromAscii("  %1 x %2").arg(iter.value()).arg(quintptr(iter.key()), 0, 16);
        }

        switch (ratio) {
        case LessOrEqual:
            result += QString::fromAscii("  (less) <= %1").arg(constant);
            break;
        case MoreOrEqual:
            result += QString::fromAscii("  (more) >= %1").arg(constant);
            break;
        default:
            result += QString::fromAscii("  (eqal) == %1").arg(constant);
        }

        return result;
    }

Properties

artificial

QSimplexVariable* QSimplexConstraint::artificial

Definition at line 96 of file qsimplex_p.h.

Referenced by QSimplex::setConstraints().

constant

qreal QSimplexConstraint::constant

Definition at line 92 of file qsimplex_p.h.

Referenced by QGraphicsAnchorLayoutPrivate::constraintsFromSizeHints(), createSlack(), QSimplex::setConstraints(), shiftConstraints(), QSimplex::simplifyConstraints(), and QGraphicsAnchorLayoutPrivate::solvePreferred().

helper

QPair<QSimplexVariable *, qreal> QSimplexConstraint::helper

Definition at line 95 of file qsimplex_p.h.

Referenced by QSimplex::setConstraints().

ratio

Ratio QSimplexConstraint::ratio

Definition at line 93 of file qsimplex_p.h.

Referenced by QGraphicsAnchorLayoutPrivate::constraintsFromSizeHints(), createSlack(), QSimplex::setConstraints(), and QSimplex::simplifyConstraints().

variables

QHash<QSimplexVariable *, qreal> QSimplexConstraint::variables

Definition at line 91 of file qsimplex_p.h.

Referenced by QGraphicsAnchorLayoutPrivate::addAnchorMaybeParallel(), GraphPath::constraint(), QGraphicsAnchorLayoutPrivate::constraintsFromSizeHints(), QGraphicsAnchorLayoutPrivate::createCenterAnchors(), createSlack(), QGraphicsAnchorLayoutPrivate::getGraphParts(), getVariables(), QGraphicsAnchorLayoutPrivate::restoreSimplifiedConstraints(), QSimplex::setConstraints(), shiftConstraints(), QSimplex::simplifyConstraints(), QGraphicsAnchorLayoutPrivate::solveMinMax(), QGraphicsAnchorLayoutPrivate::solvePreferred(), and QSimplex::solver().

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The documentation for this struct was generated from the following files:

• /src/gui/graphicsview/qsimplex_p.h
• /src/gui/graphicsview/qsimplex_p.cpp