KDChartNormalPlotter_p.cpp

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/****************************************************************************
** Copyright (C) 2001-2010 Klaralvdalens Datakonsult AB.  All rights reserved.
**
** This file is part of the KD Chart library.
**
** Licensees holding valid commercial KD Chart licenses may use this file in
** accordance with the KD Chart Commercial License Agreement provided with
** the Software.
**
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 and version 3 as published by the
** Free Software Foundation and appearing in the file LICENSE.GPL included.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** Contact info@kdab.com if any conditions of this licensing are not
** clear to you.
**
**********************************************************************/

#include "KDChartNormalPlotter_p.h"
#include "KDChartPlotter.h"

#include <limits>

using namespace KDChart;
using namespace std;

NormalPlotter::NormalPlotter( Plotter* d )
    : PlotterType( d )
{
}

Plotter::PlotType NormalPlotter::type() const
{
    return Plotter::Normal;
}

const QPair< QPointF, QPointF > NormalPlotter::calculateDataBoundaries() const
{
    return compressor().dataBoundaries();
}

void NormalPlotter::paint( PaintContext* ctx )
{
    reverseMapper().clear();

    Q_ASSERT( dynamic_cast< CartesianCoordinatePlane* >( ctx->coordinatePlane() ) );
    const CartesianCoordinatePlane* const plane = static_cast< CartesianCoordinatePlane* >( ctx->coordinatePlane() );
    const int colCount = compressor().modelDataColumns();
    const int rowCount = compressor().modelDataRows();

    if( colCount == 0 || rowCount == 0 )
        return;

    DataValueTextInfoList textInfoList;

    for( int column = 0; column < colCount; ++column )
    {
        LineAttributesInfoList lineList;
        LineAttributes laPreviousCell;
        CartesianDiagramDataCompressor::CachePosition previousCellPosition;
        CartesianDiagramDataCompressor::DataPoint lastPoint;

        for( int row = 0; row < rowCount; ++row )
        {
            const CartesianDiagramDataCompressor::CachePosition position( row, column );
            const CartesianDiagramDataCompressor::DataPoint point = compressor().data( position );

            const QModelIndex sourceIndex = attributesModel()->mapToSource( point.index );
            LineAttributes laCell = diagram()->lineAttributes( sourceIndex );
            const LineAttributes::MissingValuesPolicy policy = laCell.missingValuesPolicy();

            if( ISNAN( point.key ) || ISNAN( point.value ) )
            {
                switch( policy )
                {
                case LineAttributes::MissingValuesAreBridged: // we just bridge both values
                    continue;
                case LineAttributes::MissingValuesShownAsZero: // fall-through since that attribute makes no sense for the plotter
                case LineAttributes::MissingValuesHideSegments: // fall-through since they're just hidden
                default:
                    previousCellPosition = CartesianDiagramDataCompressor::CachePosition();
                    lastPoint = CartesianDiagramDataCompressor::DataPoint();
                    continue;
                }
            }

            // area corners, a + b are the line ends:
            const QPointF a( plane->translate( QPointF( lastPoint.key, lastPoint.value ) ) );
            const QPointF b( plane->translate( QPointF( point.key, point.value ) ) );
            if( a.toPoint() == b.toPoint() )
                continue;

            const QPointF c( plane->translate( QPointF( lastPoint.key, 0.0 ) ) );
            const QPointF d( plane->translate( QPointF( point.key, 0.0 ) ) );

            // add the pieces to painting if this is not hidden:
            if ( !point.hidden /*&& !ISNAN( lastPoint.key ) && !ISNAN( lastPoint.value ) */) {
                // add data point labels:
                const PositionPoints pts = PositionPoints( b, a, d, c );
                // if necessary, add the area to the area list:
                QList<QPolygonF> areas;
                if ( laCell.displayArea() ) {
                    QPolygonF polygon;
                    polygon << a << b << d << c;
                    areas << polygon;
                }
                appendDataValueTextInfoToList( diagram(), textInfoList, sourceIndex, pts,
                                               Position::NorthWest, Position::SouthWest,
                                               point.value );
                if( !ISNAN( lastPoint.key ) && !ISNAN( lastPoint.value ) )
                {
                    paintAreas( ctx, attributesModel()->mapToSource( lastPoint.index ), areas, laCell.transparency() );
                    lineList.append( LineAttributesInfo( sourceIndex, a, b ) );
                }
            }

            // wrap it up:
            previousCellPosition = position;
            laPreviousCell = laCell;
            lastPoint = point;
        }
        LineAttributes::MissingValuesPolicy policy = LineAttributes::MissingValuesAreBridged; //unused
        paintElements( ctx, textInfoList, lineList, policy );
    }
}