21#include <QGraphicsScene>
22#include <QGraphicsRectItem>
43 const double dx = position.x() -
start.x();
44 const double dy = position.y() -
start.y();
46 if ( constrainSquare )
48 if ( std::fabs( dx ) > std::fabs( dy ) )
50 width = std::fabs( dx );
55 height = std::fabs( dy );
59 x =
start.x() - ( ( dx < 0 ) ? width : 0 );
60 y =
start.y() - ( ( dy < 0 ) ? height : 0 );
90 x =
start.x() - width;
91 y =
start.y() - height;
96 return QRectF( x, y, width, height );
128 if ( mRubberBandItem )
130 canvas()->scene()->removeItem( mRubberBandItem );
131 delete mRubberBandItem;
138 mRubberBandItem =
new QGraphicsRectItem( 0, 0, 0, 0 );
139 mRubberBandItem->setBrush(
brush() );
140 mRubberBandItem->setPen(
pen() );
141 mRubberBandStartPos = position;
142 t.translate( position.x(), position.y() );
143 mRubberBandItem->setTransform( t );
144 mRubberBandItem->setZValue( 1000 );
145 canvas()->scene()->addItem( mRubberBandItem );
146 canvas()->scene()->update();
151 if ( !mRubberBandItem )
156 const bool constrainSquare = modifiers & Qt::ShiftModifier;
157 const bool fromCenter = modifiers & Qt::AltModifier;
159 const QRectF newRect =
updateRect( mRubberBandStartPos, position, constrainSquare, fromCenter );
160 mRubberBandItem->setRect( 0, 0, newRect.width(), newRect.height() );
162 t.translate( newRect.x(), newRect.y() );
163 mRubberBandItem->setTransform( t );
168 const bool constrainSquare = modifiers & Qt::ShiftModifier;
169 const bool fromCenter = modifiers & Qt::AltModifier;
171 if ( mRubberBandItem )
173 canvas()->scene()->removeItem( mRubberBandItem );
174 delete mRubberBandItem;
175 mRubberBandItem =
nullptr;
177 return updateRect( mRubberBandStartPos, position, constrainSquare, fromCenter );
Plot canvas is a class for displaying interactive 2d charts and plots.
void start(QPointF position, Qt::KeyboardModifiers modifiers) override
Called when a rubber band should be created at the specified starting position (in canvas coordinate ...
void update(QPointF position, Qt::KeyboardModifiers modifiers) override
Called when a rubber band should be updated to reflect a temporary ending position (in canvas coordin...
QgsPlotRectangularRubberBand(QgsPlotCanvas *canvas=nullptr)
Constructor for QgsPlotRectangularRubberBand.
~QgsPlotRectangularRubberBand() override
QRectF finish(QPointF position=QPointF(), Qt::KeyboardModifiers modifiers=Qt::KeyboardModifiers()) override
Called when a rubber band use has finished and the rubber band is no longer required.
QgsPlotRubberBand is an abstract base class for temporary rubber band items in various shapes,...
QBrush brush() const
Returns the brush used for drawing the rubber band.
void setBrush(const QBrush &brush)
Sets the brush used for drawing the rubber band.
QgsPlotRubberBand(QgsPlotCanvas *canvas=nullptr)
Constructor for QgsPlotRubberBand.
QgsPlotCanvas * canvas() const
Returns the canvas associated with the rubber band.
QRectF updateRect(QPointF start, QPointF position, bool constrainSquare, bool fromCenter)
Calculates an updated bounding box rectangle from a original start position and new position.
virtual void start(QPointF position, Qt::KeyboardModifiers modifiers)=0
Called when a rubber band should be created at the specified starting position (in canvas coordinate ...
void setPen(const QPen &pen)
Sets the pen used for drawing the rubber band.
QPen pen() const
Returns the pen used for drawing the rubber band.