19#include "moc_qgsplotrubberband.cpp"
22#include <QGraphicsScene>
23#include <QGraphicsRectItem>
44 const double dx = position.x() -
start.x();
45 const double dy = position.y() -
start.y();
47 if ( constrainSquare )
49 if ( std::fabs( dx ) > std::fabs( dy ) )
51 width = std::fabs( dx );
56 height = std::fabs( dy );
60 x =
start.x() - ( ( dx < 0 ) ? width : 0 );
61 y =
start.y() - ( ( dy < 0 ) ? height : 0 );
91 x =
start.x() - width;
92 y =
start.y() - height;
97 return QRectF( x, y, width, height );
129 if ( mRubberBandItem )
131 canvas()->scene()->removeItem( mRubberBandItem );
132 delete mRubberBandItem;
139 mRubberBandItem =
new QGraphicsRectItem( 0, 0, 0, 0 );
140 mRubberBandItem->setBrush(
brush() );
141 mRubberBandItem->setPen(
pen() );
142 mRubberBandStartPos = position;
143 t.translate( position.x(), position.y() );
144 mRubberBandItem->setTransform( t );
145 mRubberBandItem->setZValue( 1000 );
146 canvas()->scene()->addItem( mRubberBandItem );
147 canvas()->scene()->update();
152 if ( !mRubberBandItem )
157 const bool constrainSquare = modifiers & Qt::ShiftModifier;
158 const bool fromCenter = modifiers & Qt::AltModifier;
160 const QRectF newRect =
updateRect( mRubberBandStartPos, position, constrainSquare, fromCenter );
161 mRubberBandItem->setRect( 0, 0, newRect.width(), newRect.height() );
163 t.translate( newRect.x(), newRect.y() );
164 mRubberBandItem->setTransform( t );
169 const bool constrainSquare = modifiers & Qt::ShiftModifier;
170 const bool fromCenter = modifiers & Qt::AltModifier;
172 if ( mRubberBandItem )
174 canvas()->scene()->removeItem( mRubberBandItem );
175 delete mRubberBandItem;
176 mRubberBandItem =
nullptr;
178 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.