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

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