/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2018-     Equinor ASA
//
//  ResInsight is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
//  FITNESS FOR A PARTICULAR PURPOSE.
//
//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
//  for more details.
//
/////////////////////////////////////////////////////////////////////////////////

#include "RiuQwtPlotItemGroup.h"

#include "qwt_graphic.h"

#include <QRect>

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
RiuQwtPlotItemGroup::RiuQwtPlotItemGroup()
{
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
RiuQwtPlotItemGroup::~RiuQwtPlotItemGroup()
{
    this->detach();
    for ( QwtPlotItem* item : m_plotItems )
    {
        delete item;
    }
    for ( QwtPlotItem* legendItem : m_legendItems )
    {
        delete legendItem;
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiuQwtPlotItemGroup::addPlotItem( QwtPlotItem* plotItem )
{
    m_plotItems.push_back( plotItem );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiuQwtPlotItemGroup::addLegendItem( QwtPlotItem* legendItem )
{
    m_legendItems.push_back( legendItem );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiuQwtPlotItemGroup::draw( QPainter* painter, const QwtScaleMap& xMap, const QwtScaleMap& yMap, const QRectF& canvasRect ) const
{
    for ( const QwtPlotItem* item : m_plotItems )
    {
        item->draw( painter, xMap, yMap, canvasRect );
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QRectF RiuQwtPlotItemGroup::boundingRect() const
{
    QRectF totalBoundingRect;
    for ( const QwtPlotItem* item : m_plotItems )
    {
        totalBoundingRect = totalBoundingRect.united( item->boundingRect() );
    }
    return totalBoundingRect;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QwtGraphic RiuQwtPlotItemGroup::legendIcon( int index, const QSizeF& size ) const
{
    QwtGraphic graphic;
    graphic.setDefaultSize( size );

    QPainter painter( &graphic );
    painter.setRenderHint( QPainter::Antialiasing, testRenderHint( QwtPlotItem::RenderAntialiased ) );

    for ( QwtPlotItem* legendItem : m_legendItems )
    {
        QwtGraphic subGraphic   = legendItem->legendIcon( index, legendItem->legendIconSize() );
        QRectF     boundingRect = legendItem->boundingRect();
        QImage     subImage     = subGraphic.toImage();
        QRectF     subRect( 0.0, 0.0, legendItem->legendIconSize().width(), legendItem->legendIconSize().height() );
        // Symbols may not have a bounding width/height. Force the width height to be the same as the icon
        boundingRect.setWidth( subRect.width() );
        boundingRect.setHeight( subRect.height() );
        // Paint onto the existing icon
        painter.drawImage( boundingRect, subImage, subRect );
    }
    return graphic;
}