qwt_plot_graphicitem.cpp

Go to the documentation of this file.

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#include "qwt_plot_graphicitem.h"
#include "qwt_scale_map.h"
#include "qwt_painter.h"
#include "qwt_text.h"
#include "qwt_graphic.h"

class QwtPlotGraphicItem::PrivateData
{
public:
    PrivateData()
    {
    }

    QRectF boundingRect;
    QwtGraphic graphic;
};

QwtPlotGraphicItem::QwtPlotGraphicItem( const QString& title ):
    QwtPlotItem( QwtText( title ) )
{
    init();
}

QwtPlotGraphicItem::QwtPlotGraphicItem( const QwtText& title ):
    QwtPlotItem( title )
{
    init();
}

QwtPlotGraphicItem::~QwtPlotGraphicItem()
{
    delete d_data;
}

void QwtPlotGraphicItem::init()
{
    d_data = new PrivateData();
    d_data->boundingRect = QwtPlotItem::boundingRect();

    setItemAttribute( QwtPlotItem::AutoScale, true );
    setItemAttribute( QwtPlotItem::Legend, false );

    setZ( 8.0 );
}

int QwtPlotGraphicItem::rtti() const
{
    return QwtPlotItem::Rtti_PlotGraphic;
}

void QwtPlotGraphicItem::setGraphic(
    const QRectF &rect, const QwtGraphic &graphic )
{
    d_data->boundingRect = rect;
    d_data->graphic = graphic;
    
    legendChanged();
    itemChanged();
}

QwtGraphic QwtPlotGraphicItem::graphic() const
{
    return d_data->graphic;
}

QRectF QwtPlotGraphicItem::boundingRect() const
{
    return d_data->boundingRect;
}

void QwtPlotGraphicItem::draw( QPainter *painter,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRectF &canvasRect ) const
{
    if ( d_data->graphic.isEmpty() )
        return;

    QRectF r = QwtScaleMap::transform( xMap, yMap, boundingRect() );

    if ( !r.intersects( canvasRect ) )
        return;

    if ( QwtPainter::roundingAlignment( painter ) )
    {
        r.setLeft ( qRound( r.left() ) );
        r.setRight ( qRound( r.right() ) );
        r.setTop ( qRound( r.top() ) );
        r.setBottom ( qRound( r.bottom() ) );
    }

    d_data->graphic.render( painter, r );
}