KDChartNormalPlotter_p.cpp

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00001 /* -*- Mode: C++ -*-
00002    KDChart - a multi-platform charting engine
00003    */
00004 
00005 /****************************************************************************
00006  ** Copyright (C) 2005-2007 Klarälvdalens Datakonsult AB.  All rights reserved.
00007  **
00008  ** This file is part of the KD Chart library.
00009  **
00010  ** This file may be distributed and/or modified under the terms of the
00011  ** GNU General Public License version 2 as published by the Free Software
00012  ** Foundation and appearing in the file LICENSE.GPL included in the
00013  ** packaging of this file.
00014  **
00015  ** Licensees holding valid commercial KD Chart licenses may use this file in
00016  ** accordance with the KD Chart Commercial License Agreement provided with
00017  ** the Software.
00018  **
00019  ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
00020  ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
00021  **
00022  ** See http://www.kdab.net/kdchart for
00023  **   information about KD Chart Commercial License Agreements.
00024  **
00025  ** Contact info@kdab.net if any conditions of this
00026  ** licensing are not clear to you.
00027  **
00028  **********************************************************************/
00029 
00030 #include "KDChartPlotter.h"
00031 #include "KDChartNormalPlotter_p.h"
00032 
00033 using namespace KDChart;
00034 
00035 NormalPlotter::NormalPlotter( Plotter* d )
00036     : PlotterType( d )
00037 {
00038 }
00039 
00040 Plotter::PlotType NormalPlotter::type() const
00041 {
00042     return Plotter::Normal;
00043 }
00044 
00045 const QPair< QPointF, QPointF > NormalPlotter::calculateDataBoundaries() const
00046 {
00047     const int rowCount = compressor().modelDataRows();
00048     const int colCount = compressor().modelDataColumns();
00049     double xMin = 0;
00050     double xMax = 0;
00051     double yMin = 0;
00052     double yMax = 0;
00053 
00054     bool first = true;
00055     for( int column = 0; column < colCount; ++column )
00056     {
00057         for ( int row = 0; row < rowCount; ++row )
00058         {
00059             const CartesianDiagramDataCompressor::CachePosition position( row, column );
00060             const CartesianDiagramDataCompressor::DataPoint point = compressor().data( position );
00061 
00062             const double valueX = point.key;
00063             const double valueY = point.value;
00064 
00065             if( first )
00066             {
00067                 xMin = valueX;
00068                 xMax = valueX;
00069                 yMin = valueY;
00070                 yMax = valueY;
00071             }
00072             else
00073             {
00074                 xMin = qMin( xMin, valueX );
00075                 xMax = qMax( xMax, valueX );
00076                 yMin = qMin( yMin, valueY );
00077                 yMax = qMax( yMax, valueY );
00078             }
00079 
00080             first = false;
00081         }
00082     }
00083 
00084     const QPointF bottomLeft( QPointF( xMin, qMin( 0.0, yMin ) ) );
00085     const QPointF topRight( QPointF( xMax, yMax ) );
00086     return QPair< QPointF, QPointF >( bottomLeft, topRight );
00087 }
00088 
00089 void NormalPlotter::paint( PaintContext* ctx )
00090 {
00091     reverseMapper().clear();
00092 
00093     Q_ASSERT( dynamic_cast< CartesianCoordinatePlane* >( ctx->coordinatePlane() ) );
00094     const CartesianCoordinatePlane* const plane = static_cast< CartesianCoordinatePlane* >( ctx->coordinatePlane() );
00095     const int colCount = compressor().modelDataColumns();
00096     const int rowCount = compressor().modelDataRows();
00097 
00098     if( colCount == 0 || rowCount == 0 )
00099         return;
00100 
00101     DataValueTextInfoList textInfoList;
00102     LineAttributesInfoList lineList;
00103     LineAttributes::MissingValuesPolicy policy; // ???
00104     
00105     for( int column = 0; column < colCount; ++column )
00106     {
00107         LineAttributes laPreviousCell;
00108         CartesianDiagramDataCompressor::CachePosition previousCellPosition;
00109 
00110         for( int row = 0; row < rowCount; ++row )
00111         {
00112             const CartesianDiagramDataCompressor::CachePosition position( row, column );
00113             const CartesianDiagramDataCompressor::DataPoint point = compressor().data( position );
00114             LineAttributes laCell;
00115             if( row > 0 )
00116             {
00117                 const QModelIndex sourceIndex = attributesModel()->mapToSource( point.index );
00118                 const CartesianDiagramDataCompressor::DataPoint lastPoint = compressor().data( previousCellPosition );
00119                 // area corners, a + b are the line ends:
00120                 const QPointF a( plane->translate( QPointF( lastPoint.key, lastPoint.value ) ) );
00121                 const QPointF b( plane->translate( QPointF( point.key, point.value ) ) );
00122                 const QPointF c( plane->translate( QPointF( lastPoint.key, 0.0 ) ) );
00123                 const QPointF d( plane->translate( QPointF( point.key, 0.0 ) ) );
00124                 // add the line to the list:
00125                 laCell = diagram()->lineAttributes( sourceIndex );
00126                 // add data point labels:
00127                 const PositionPoints pts = PositionPoints( b, a, d, c );
00128                 // if necessary, add the area to the area list:
00129                 QList<QPolygonF> areas;
00130                 if ( laCell.displayArea() ) {
00131                     QPolygonF polygon;
00132                     polygon << a << b << d << c;
00133                     areas << polygon;
00134                 }
00135                 // add the pieces to painting if this is not hidden:
00136                 if ( ! point.hidden ) {
00137                     appendDataValueTextInfoToList( diagram(), textInfoList, sourceIndex, pts,
00138                                                    Position::NorthWest, Position::SouthWest,
00139                                                    point.value );
00140                     paintAreas( ctx, attributesModel()->mapToSource( lastPoint.index ), areas, laCell.transparency() );
00141                     lineList.append( LineAttributesInfo( sourceIndex, a, b ) );
00142                 }
00143             }
00144             // wrap it up:
00145             previousCellPosition = position;
00146             laPreviousCell = laCell;
00147         }
00148     }
00149     paintElements( ctx, textInfoList, lineList, policy );
00150 }

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