KDChart::ReverseMapper Class Reference

#include <ReverseMapper.h>

Collaboration diagram for KDChart::ReverseMapper:

[legend]

List of all members.

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Detailed Description

The ReverseMapper stores information about objects on a chart and their respective model indexes.

Definition at line 49 of file ReverseMapper.h.

Public Member Functions
void	addCircle (int row, int column, const QPointF &location, const QSizeF &diameter)
void	addItem (ChartGraphicsItem *item)
void	addLine (int row, int column, const QPointF &from, const QPointF &to)
void	addPolygon (int row, int column, const QPolygonF &polygon)
void	addRect (int row, int column, const QRectF &rect)
QRectF	boundingRect (int row, int column) const
void	clear ()
QModelIndexList	indexesAt (const QPointF &point) const
QModelIndexList	indexesIn (const QRect &rect) const
QPolygonF	polygon (int row, int column) const
	ReverseMapper (AbstractDiagram *diagram)
	ReverseMapper ()
void	setDiagram (AbstractDiagram *diagram)
	~ReverseMapper ()

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Constructor & Destructor Documentation

ReverseMapper::ReverseMapper

(

)

Definition at line 45 of file ReverseMapper.cpp.

    : m_scene( 0 )
    , m_diagram( 0 )
{
}

ReverseMapper::ReverseMapper

(

AbstractDiagram *

diagram

)

[explicit]

Definition at line 51 of file ReverseMapper.cpp.

    : m_scene( 0 )
    , m_diagram( diagram )
{
}

ReverseMapper::~ReverseMapper

(

)

Definition at line 57 of file ReverseMapper.cpp.

{
    delete m_scene; m_scene = 0;
}

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Member Function Documentation

void ReverseMapper::addCircle	(	int	row,
		int	column,
		const QPointF &	location,
		const QSizeF &	diameter
	)

Definition at line 144 of file ReverseMapper.cpp.

References addPolygon().

Referenced by addLine().

{
    QPainterPath path;
    QPointF ossfet( -0.5*diameter.width(), -0.5*diameter.height() );
    path.addEllipse( QRectF( location + ossfet, diameter ) );
    addPolygon( row, column, QPolygonF( path.toFillPolygon() ) );
}

void ReverseMapper::addItem

(

ChartGraphicsItem *

item

)

Definition at line 125 of file ReverseMapper.cpp.

References KDChart::ChartGraphicsItem::column(), and KDChart::ChartGraphicsItem::row().

Referenced by addPolygon().

{
    Q_ASSERT( m_scene );
    m_scene->addItem( item );
    m_itemMap.insert( m_diagram->model()->index( item->row(), item->column(), m_diagram->rootIndex() ), item );
}

void ReverseMapper::addLine	(	int	row,
		int	column,
		const QPointF &	from,
		const QPointF &	to
	)

Definition at line 152 of file ReverseMapper.cpp.

References addCircle(), and addPolygon().

{
    // that's no line, dude... make a small circle around that point, instead
    if( from == to )
    {
        addCircle( row, column, from, QSizeF( 1.5, 1.5 ) );
        return;
    }
    // lines do not make good polygons to click on. we calculate a 2
    // pixel wide rectangle, where the original line is excatly
    // centered in.
    // make a 3 pixel wide polygon from the line:
    static const QPointF pixel( 1.0, 1.0 );
    QPointF left, right;
    if ( from.x() < to.x() ) {
        left = from;
        right = to;
    } else {
        right = from;
        left = to;
    }
    const QPointF lineVector( right - left );
    const qreal lineVectorLength = sqrt( lineVector.x() * lineVector.x() + lineVector.y() * lineVector.y() );
    const QPointF lineVectorUnit( lineVector / lineVectorLength );
    const QPointF normOfLineVectorUnit( -lineVectorUnit.y(), lineVectorUnit.x() );
    // now the four polygon end points:
    const QPointF one( left - lineVectorUnit + normOfLineVectorUnit );
    const QPointF two( left - lineVectorUnit - normOfLineVectorUnit );
    const QPointF three( right + lineVectorUnit - normOfLineVectorUnit );
    const QPointF four( right + lineVectorUnit + normOfLineVectorUnit );
    addPolygon( row, column, QPolygonF() << one << two << three << four );
}

void ReverseMapper::addPolygon	(	int	row,
		int	column,
		const QPolygonF &	polygon
	)

Definition at line 137 of file ReverseMapper.cpp.

References addItem().

Referenced by addCircle(), addLine(), and addRect().

{
    ChartGraphicsItem* item = new ChartGraphicsItem( row, column );
    item->setPolygon( polygon );
    addItem( item );
}

void ReverseMapper::addRect	(	int	row,
		int	column,
		const QRectF &	rect
	)

Definition at line 132 of file ReverseMapper.cpp.

References addPolygon().

{
    addPolygon( row, column, QPolygonF( rect ) );
}

QRectF ReverseMapper::boundingRect	(	int	row,
		int	column
	)			const

Definition at line 119 of file ReverseMapper.cpp.

{
    const QModelIndex index = m_diagram->model()->index( row, column, m_diagram->rootIndex() );
    return m_itemMap.contains( index ) ? m_itemMap[ index ]->polygon().boundingRect() : QRectF();
}

void ReverseMapper::clear

(

)

Definition at line 68 of file ReverseMapper.cpp.

{
    delete m_scene;
    m_scene = new QGraphicsScene();
}

QModelIndexList ReverseMapper::indexesAt

(

const QPointF &

point

)

const

Definition at line 93 of file ReverseMapper.cpp.

References KDChart::ChartGraphicsItem::column(), and KDChart::ChartGraphicsItem::row().

{
    Q_ASSERT( m_diagram );
    if ( m_scene && m_scene->sceneRect().contains( point ) ) {
        QList<QGraphicsItem *> items = m_scene->items( point );
        QModelIndexList indexes;
        Q_FOREACH( QGraphicsItem* item, items ) {
            ChartGraphicsItem* i = qgraphicsitem_cast<ChartGraphicsItem*>( item );
            if ( i ) {
                QModelIndex index ( m_diagram->model()->index( i->row(), i->column(), m_diagram->rootIndex() ) );
                if( !indexes.contains(index) )
                    indexes << index;
            }
        }
        return indexes;
    } else {
        return QModelIndexList();
    }
}

QModelIndexList ReverseMapper::indexesIn

(

const QRect &

rect

)

const

Definition at line 74 of file ReverseMapper.cpp.

References KDChart::ChartGraphicsItem::column(), and KDChart::ChartGraphicsItem::row().

{
    Q_ASSERT( m_diagram );
    if ( m_scene && m_scene->sceneRect().intersects( rect ) ) {
        QList<QGraphicsItem *> items = m_scene->items( rect );
        QModelIndexList indexes;
        Q_FOREACH( QGraphicsItem* item, items ) {
            ChartGraphicsItem* i = qgraphicsitem_cast<ChartGraphicsItem*>( item );
            if ( i ) {
                QModelIndex index ( m_diagram->model()->index( i->row(), i->column(), m_diagram->rootIndex() ) );
                indexes << index;
            }
        }
        return indexes;
    } else {
        return QModelIndexList();
    }
}

QPolygonF ReverseMapper::polygon	(	int	row,
		int	column
	)			const

Definition at line 113 of file ReverseMapper.cpp.

{
    const QModelIndex index = m_diagram->model()->index( row, column, m_diagram->rootIndex() );
    return m_itemMap.contains( index ) ? m_itemMap[ index ]->polygon() : QPolygon();
}

void ReverseMapper::setDiagram

(

AbstractDiagram *

diagram

)

Definition at line 62 of file ReverseMapper.cpp.

{

    m_diagram = diagram;
}

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

• ReverseMapper.h
• ReverseMapper.cpp

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