KD Chart 2: KDChartNormalBarDiagram_p.cpp Source File

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# KDChartNormalBarDiagram_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 "KDChartNormalBarDiagram_p.h"
    00037
    00038 using namespace KDChart;
    00039
    00040 NormalBarDiagram::NormalBarDiagram( BarDiagram* d )
    00041     : BarDiagramType( d )
    00042 {
    00043 }
    00044
    00045 BarDiagram::BarType NormalBarDiagram::type() const
    00046 {
    00047     return BarDiagram::Normal;
    00048 }
    00049
    00050 const QPair<QPointF, QPointF> NormalBarDiagram::calculateDataBoundaries() const
    00051 {
    00052     const int rowCount = compressor().modelDataRows();
    00053     const int colCount = compressor().modelDataColumns();
    00054
    00055     double xMin = 0.0;
    00056     double xMax = diagram()->model() ? diagram()->model()->rowCount( diagram()->rootIndex() ) : 0;
    00057     double yMin = 0.0, yMax = 0.0;
    00058
    00059     bool bStarting = true;
    00060     for ( int column = 0; column < colCount; ++column )
    00061     {
    00062         for ( int row = 0; row < rowCount; ++row )
    00063         {
    00064             const CartesianDiagramDataCompressor::CachePosition position( row, column );
    00065             const CartesianDiagramDataCompressor::DataPoint point = compressor().data( position );
    00066             const double value = point.value;
    00067             // this is always true yMin can be 0 in case all values
    00068             // are the same
    00069             // same for yMax it can be zero if all values are negative
    00070             if( bStarting ){
    00071                 yMin = value;
    00072                 yMax = value;
    00073                 bStarting = false;
    00074             }else{
    00075                 yMin = qMin( yMin, value );
    00076                 yMax = qMax( yMax, value );
    00077             }
    00078         }
    00079     }
    00080
    00081     // special cases
    00082     if (  yMax == yMin ) {
    00083         if ( yMin == 0.0 )
    00084             yMax = 0.1; //we need at least a range
    00085         else if( yMax < 0.0 )
    00086             yMax = 0.0; // they are the same and negative
    00087         else if( yMin > 0.0 )
    00088             yMin = 0.0; // they are the same but positive
    00089     }
    00090     const QPointF bottomLeft ( QPointF( xMin, yMin ) );
    00091     const QPointF topRight ( QPointF( xMax, yMax ) );
    00092
    00093     return QPair< QPointF, QPointF >( bottomLeft,  topRight );
    00094 }
    00095
    00096 void NormalBarDiagram::paint(  PaintContext* ctx )
    00097 {
    00098     reverseMapper().clear();
    00099
    00100     const QPair<QPointF,QPointF> boundaries = diagram()->dataBoundaries(); // cached
    00101
    00102     const QPointF boundLeft = ctx->coordinatePlane()->translate( boundaries.first ) ;
    00103     const QPointF boundRight = ctx->coordinatePlane()->translate( boundaries.second );
    00104
    00105     const int rowCount = attributesModel()->rowCount(attributesModelRootIndex());
    00106     const int colCount = attributesModel()->columnCount(attributesModelRootIndex());
    00107
    00108     BarAttributes ba = diagram()->barAttributes( diagram()->model()->index( 0, 0, diagram()->rootIndex() ) );
    00109     double barWidth = 0;
    00110     double maxDepth = 0;
    00111     double width = boundRight.x() - boundLeft.x();
    00112     double groupWidth = width / (rowCount + 2);
    00113     double spaceBetweenBars = 0;
    00114     double spaceBetweenGroups = 0;
    00115
    00116     if ( ba.useFixedBarWidth() ) {
    00117
    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     //Pending Michel: FixMe
    00135     if ( ba.useFixedDataValueGap() ) {
    00136         if ( ctx->rectangle().width() > maxLimit )
    00137             spaceBetweenBars += ba.fixedDataValueGap();
    00138         else
    00139             spaceBetweenBars = ((ctx->rectangle().width()/rowCount) - groupWidth)/(colCount-1);
    00140     }
    00141
    00142     if ( ba.useFixedValueBlockGap() ) {
    00143         spaceBetweenGroups += ba.fixedValueBlockGap();
    00144     }
    00145
    00146     calculateValueAndGapWidths( rowCount, colCount,groupWidth,
    00147                                 barWidth, spaceBetweenBars, spaceBetweenGroups );
    00148
    00149     DataValueTextInfoList list;
    00150
    00151     for( int row = 0; row < rowCount; ++row )
    00152     {
    00153         double offset = -groupWidth/2 + spaceBetweenGroups/2;
    00154
    00155         if ( ba.useFixedDataValueGap() )
    00156         {
    00157             if ( spaceBetweenBars > 0 )
    00158             {
    00159                 if ( ctx->rectangle().width() > maxLimit )
    00160                     offset -= ba.fixedDataValueGap();
    00161                 else
    00162                     offset -= ((ctx->rectangle().width()/rowCount) - groupWidth)/(colCount-1);
    00163
    00164             }
    00165             else
    00166             {
    00167                 offset += barWidth/2;
    00168             }
    00169         }
    00170
    00171         for( int column=0; column< colCount; ++column )
    00172         {
    00173             // paint one group
    00174             const CartesianDiagramDataCompressor::CachePosition position( row,  column );
    00175             const CartesianDiagramDataCompressor::DataPoint point = compressor().data( position );
    00176             const QModelIndex sourceIndex = attributesModel()->mapToSource( point.index );
    00177             const qreal value = point.value;//attributesModel()->data( sourceIndex ).toDouble();
    00178             QPointF topPoint = ctx->coordinatePlane()->translate( QPointF( point.key + 0.5, value ) );
    00179             QPointF bottomPoint =  ctx->coordinatePlane()->translate( QPointF( point.key, 0 ) );
    00180             const double barHeight = bottomPoint.y() - topPoint.y();
    00181             topPoint.setX( topPoint.x() + offset );
    00182             const QRectF rect( topPoint, QSizeF( barWidth, barHeight ) );
    00183             appendDataValueTextInfoToList( diagram(), list, sourceIndex, PositionPoints( rect ),
    00184                                            Position::NorthWest, Position::SouthEast,
    00185                                            point.value );
    00186             paintBars( ctx, sourceIndex, rect, maxDepth );
    00187
    00188             offset += barWidth + spaceBetweenBars;
    00189         }
    00190     }
    00191     paintDataValueTextsAndMarkers(  diagram(),  ctx,  list,  false );
    00192 }