IntersectionSnapStrategy Class Reference

snaps to intersections of shapes More...

#include <KoSnapStrategy.h>

Inheritance diagram for IntersectionSnapStrategy:

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

Definition at line 101 of file KoSnapStrategy.h.

Constructor & Destructor Documentation

IntersectionSnapStrategy()

IntersectionSnapStrategy::IntersectionSnapStrategy

(

)

Definition at line 374 of file KoSnapStrategy.cpp.

    : KoSnapStrategy(KoSnapGuide::IntersectionSnapping)
{
}

Member Function Documentation

decoration()

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

overridevirtual

returns the current snap strategy decoration

Implements KoSnapStrategy.

Definition at line 412 of file KoSnapStrategy.cpp.

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

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

snap()

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

overridevirtual

Implements KoSnapStrategy.

Definition at line 379 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);
    QPointF snappedPoint = mousePosition;
 
    QList<KoPathSegment> segments = proxy->segmentsInRect(rect, false);
    int segmentCount = segments.count();
    for (int i = 0; i < segmentCount; ++i) {
        const KoPathSegment &s1 = segments[i];
        for (int j = i + 1; j < segmentCount; ++j) {
            QList<QPointF> isects = s1.intersections(segments[j]);
            Q_FOREACH (const QPointF &point, isects) {
                if (! rect.contains(point))
                    continue;
                qreal distance = squareDistance(mousePosition, point);
                if (distance < maxDistance && distance < minDistance) {
                    snappedPoint = point;
                    minDistance = distance;
                }
            }
        }
    }
 
    setSnappedPosition(snappedPoint, ToPoint);
 
    return (minDistance < HUGE_VAL);
}

References distance(), s1, KoSnapProxy::segmentsInRect(), KoSnapStrategy::setSnappedPosition(), KoSnapStrategy::squareDistance(), and KoSnapStrategy::ToPoint.

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

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