snaps to path points More...

#include <KoSnapStrategy.h>

Inheritance diagram for NodeSnapStrategy:

Public Member Functions
QPainterPath	decoration (const KoViewConverter &converter) const override
	returns the current snap strategy decoration

	NodeSnapStrategy ()

bool	snap (const QPointF &mousePosition, KoSnapProxy *proxy, qreal maxSnapDistance) override

Public Member Functions inherited from KoSnapStrategy
	KoSnapStrategy (KoSnapGuide::Strategy type)

QPointF	snappedPosition () const
	returns the snapped position form the last call to snapToPoints

SnapType	snappedType () const

KoSnapGuide::Strategy	type () const
	returns the strategies type

virtual	~KoSnapStrategy ()

Additional Inherited Members
Public Types inherited from KoSnapStrategy
enum	SnapType { ToPoint = 0 , ToLine }

Static Public Member Functions inherited from KoSnapStrategy
static qreal	scalarProduct (const QPointF &p1, const QPointF &p2)

static qreal	squareDistance (const QPointF &p1, const QPointF &p2)

Protected Member Functions inherited from KoSnapStrategy
void	setSnappedPosition (const QPointF &position, SnapType snapType)
	sets the current snapped position

Detailed Description

snaps to path points

Definition at line 77 of file KoSnapStrategy.h.

Constructor & Destructor Documentation

◆ NodeSnapStrategy()

NodeSnapStrategy::NodeSnapStrategy ( )

Definition at line 134 of file KoSnapStrategy.cpp.

    : KoSnapStrategy(KoSnapGuide::NodeSnapping)
{
}

Member Function Documentation

◆ decoration()

QPainterPath NodeSnapStrategy::decoration ( const KoViewConverter & converter ) const

overridevirtual

returns the current snap strategy decoration

Implements KoSnapStrategy.

Definition at line 163 of file KoSnapStrategy.cpp.

{
    QRectF unzoomedRect = converter.viewToDocument(QRectF(0, 0, 11, 11));
    unzoomedRect.moveCenter(snappedPosition());
    QPainterPath decoration;
    decoration.addEllipse(unzoomedRect);
    return decoration;
}

References decoration(), KoSnapStrategy::snappedPosition(), and KoViewConverter::viewToDocument().

◆ snap()

bool NodeSnapStrategy::snap	(	const QPointF &	mousePosition,
		KoSnapProxy *	proxy,
		qreal	maxSnapDistance )

overridevirtual

Implements KoSnapStrategy.

Definition at line 139 of file KoSnapStrategy.cpp.

{
    Q_ASSERT(std::isfinite(maxSnapDistance));
    const qreal maxDistance = maxSnapDistance * maxSnapDistance;
    qreal minDistance = HUGE_VAL;
 
    QRectF rect(-maxSnapDistance, -maxSnapDistance, maxSnapDistance, maxSnapDistance);
    rect.moveCenter(mousePosition);
    QList<QPointF> points = proxy->pointsInRect(rect, false);
    QPointF snappedPoint = mousePosition;
 
    foreach (const QPointF &point, points) {
        qreal distance = squareDistance(mousePosition, point);
        if (distance < maxDistance && distance < minDistance) {
            snappedPoint = point;
            minDistance = distance;
        }
    }
 
    setSnappedPosition(snappedPoint, ToPoint);
 
    return (minDistance < HUGE_VAL);
}

References distance(), KoSnapProxy::pointsInRect(), KoSnapStrategy::setSnappedPosition(), KoSnapStrategy::squareDistance(), and KoSnapStrategy::ToPoint.

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

libs/flake/KoSnapStrategy.h
libs/flake/KoSnapStrategy.cpp