KDChartPercentBarDiagram_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 <QModelIndex>
00031 
00032 #include "KDChartBarDiagram.h"
00033 #include "KDChartTextAttributes.h"
00034 #include "KDChartAttributesModel.h"
00035 #include "KDChartAbstractCartesianDiagram.h"
00036 #include "KDChartPercentBarDiagram_p.h"
00037 
00038 using namespace KDChart;
00039 
00040 PercentBarDiagram::PercentBarDiagram( BarDiagram* d )
00041     : BarDiagramType( d )
00042 {
00043 }
00044 
00045 BarDiagram::BarType PercentBarDiagram::type() const
00046 {
00047     return BarDiagram::Percent;
00048 }
00049 
00050 const QPair<QPointF, QPointF> PercentBarDiagram::calculateDataBoundaries() const
00051 {
00052     const int rowCount = compressor().modelDataRows();
00053     const int colCount = compressor().modelDataColumns();
00054 
00055     const double xMin = 0;
00056     const double xMax = diagram()->model() ? diagram()->model()->rowCount( diagram()->rootIndex() ) : 0;
00057     double yMin = 0.0, yMax = 0.0;
00058     for( int col = 0; col < colCount; ++col )
00059     {
00060         for( int row = 0; row < rowCount; ++row )
00061         {
00062             // Ordinate should begin at 0 the max value being the 100% pos
00063             const QModelIndex idx = diagram()->model()->index( row, col, diagram()->rootIndex() );
00064             // only positive values are handled
00065             double value = diagram()->model()->data( idx ).toDouble();
00066             if ( value > 0 )
00067                 yMax = qMax( yMax, value );
00068         }
00069     }
00070     // special cases
00071     if (  yMax == yMin ) {
00072         if ( yMin == 0.0 )
00073             yMax = 0.1; //we need at list a range
00074         else
00075             yMax = 0.0; // they are the same but negative
00076     }
00077     const QPointF bottomLeft( QPointF( xMin, yMin ) );
00078     const QPointF topRight( QPointF( xMax, yMax ) );
00079 
00080     //qDebug() << "BarDiagram::calculateDataBoundaries () returns ( " << bottomLeft << topRight <<")";
00081     return QPair< QPointF, QPointF >( bottomLeft,  topRight );
00082 }
00083 
00084 void PercentBarDiagram::paint( PaintContext* ctx )
00085 {
00086     reverseMapper().clear();
00087 
00088     const QPair<QPointF,QPointF> boundaries = diagram()->dataBoundaries(); // cached
00089 
00090     const QPointF boundLeft = ctx->coordinatePlane()->translate( boundaries.first ) ;
00091     const QPointF boundRight = ctx->coordinatePlane()->translate( boundaries.second );
00092 
00093     const int rowCount = compressor().modelDataRows();
00094     const int colCount = compressor().modelDataColumns();
00095 
00096     BarAttributes ba = diagram()->barAttributes( diagram()->model()->index( 0, 0, diagram()->rootIndex() ) );
00097     double barWidth = 0;
00098     double maxDepth = 0;
00099     double width = boundRight.x() - boundLeft.x();
00100     double groupWidth = width/ (rowCount + 2);
00101     double spaceBetweenBars = 0;
00102     double spaceBetweenGroups = 0;
00103 
00104     if ( ba.useFixedBarWidth() ) {
00105         barWidth = ba.fixedBarWidth();
00106         groupWidth += barWidth;
00107 
00108         // Pending Michel set a min and max value for the groupWidth
00109         // related to the area.width
00110         if ( groupWidth < 0 )
00111             groupWidth = 0;
00112 
00113         if ( groupWidth  * rowCount > ctx->rectangle().width() )
00114             groupWidth = ctx->rectangle().width() / rowCount;
00115     }
00116 
00117     // maxLimit: allow the space between bars to be larger until area.width()
00118     // is covered by the groups.
00119     double maxLimit = rowCount * (groupWidth + ((colCount-1) * ba.fixedDataValueGap()) );
00120 
00121 
00122     //Pending Michel: FixMe
00123     if ( ba.useFixedDataValueGap() ) {
00124         if ( ctx->rectangle().width() > maxLimit )
00125             spaceBetweenBars += ba.fixedDataValueGap();
00126         else
00127             spaceBetweenBars = ((ctx->rectangle().width()/rowCount) - groupWidth)/(colCount-1);
00128     }
00129 
00130     if ( ba.useFixedValueBlockGap() )
00131         spaceBetweenGroups += ba.fixedValueBlockGap();
00132 
00133     calculateValueAndGapWidths( rowCount, colCount,groupWidth,
00134                                 barWidth, spaceBetweenBars, spaceBetweenGroups );
00135 
00136     DataValueTextInfoList list;
00137     const double maxValue = 100; // always 100 %
00138     double sumValues = 0;
00139     QVector <double > sumValuesVector;
00140 
00141     //calculate sum of values for each column and store
00142     for( int row = 0; row < rowCount; ++row )
00143     {
00144         for( int col = 0; col < colCount; ++col )
00145         {
00146             const CartesianDiagramDataCompressor::CachePosition position( row, col );
00147             const CartesianDiagramDataCompressor::DataPoint point = compressor().data( position );
00148             if ( point.value > 0 )
00149                 sumValues += point.value;
00150             if ( col == colCount - 1 ) {
00151                 sumValuesVector <<  sumValues ;
00152                 sumValues = 0;
00153             }
00154         }
00155     }
00156 
00157     // calculate stacked percent value
00158     for( int col = 0; col < colCount; ++col )
00159     {
00160         double offset = spaceBetweenGroups;
00161         if( ba.useFixedBarWidth() )
00162             offset -= ba.fixedBarWidth();
00163         
00164         if( offset < 0 )
00165             offset = 0;
00166 
00167         for( int row = 0; row < rowCount ; ++row )
00168         {
00169             const CartesianDiagramDataCompressor::CachePosition position( row, col );
00170             const CartesianDiagramDataCompressor::DataPoint p = compressor().data( position );
00171             QModelIndex sourceIndex = attributesModel()->mapToSource( p.index );
00172             ThreeDBarAttributes threeDAttrs = diagram()->threeDBarAttributes( sourceIndex );
00173 
00174             if ( threeDAttrs.isEnabled() ){
00175                 if ( barWidth > 0 )
00176                     barWidth =  (width - ((offset+(threeDAttrs.depth()))*rowCount))/ rowCount;
00177                 if ( barWidth <= 0 ) {
00178                     barWidth = 0;
00179                     maxDepth = offset - ( width/rowCount);
00180                 }
00181             }else{
00182                 barWidth = (ctx->rectangle().width() - (offset*rowCount))/ rowCount;
00183             }
00184 
00185             const double value = p.value;
00186             double stackedValues = 0.0;
00187             double key = 0.0;
00188             
00189             // calculate stacked percent value
00190             // we only take in account positives values for now.
00191             for( int k = col; k >= 0 ; --k )
00192             {
00193                 const CartesianDiagramDataCompressor::CachePosition position( row, k );
00194                 const CartesianDiagramDataCompressor::DataPoint point = compressor().data( position );
00195                 if ( point.value > 0)
00196                     stackedValues += point.value;
00197                 key = point.key;
00198             }
00199 
00200             QPointF point, previousPoint;
00201             if(  sumValuesVector.at( row ) != 0 && value > 0 ) {
00202                 point = ctx->coordinatePlane()->translate( QPointF( key,  stackedValues / sumValuesVector.at( row ) * maxValue ) );
00203                 point.rx() += offset / 2;
00204 
00205                 previousPoint = ctx->coordinatePlane()->translate( QPointF( key, ( stackedValues - value)/sumValuesVector.at(row)* maxValue ) );
00206             }
00207             const double barHeight = previousPoint.y() - point.y();
00208 
00209             const QRectF rect( point, QSizeF( barWidth, barHeight ) );
00210             appendDataValueTextInfoToList( diagram(), list, sourceIndex, PositionPoints( rect ),
00211                                               Position::NorthWest, Position::SouthEast,
00212                                               p.value );
00213             paintBars( ctx, sourceIndex, rect, maxDepth );
00214         }
00215     }
00216     paintDataValueTextsAndMarkers(  diagram(),  ctx,  list,  false );
00217 }

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