KDChartTernaryPointDiagram.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 <limits>
00031 
00032 #include <QPainter>
00033 
00034 #include <KDChartPaintContext>
00035 
00036 #include "TernaryPoint.h"
00037 #include "TernaryConstants.h"
00038 #include "KDChartTernaryPointDiagram.h"
00039 #include "KDChartTernaryPointDiagram_p.h"
00040 
00041 using namespace KDChart;
00042 
00043 #define d d_func()
00044 
00045 TernaryPointDiagram::Private::Private()
00046     : AbstractTernaryDiagram::Private()
00047 {
00048 }
00049 
00050 TernaryPointDiagram::TernaryPointDiagram ( QWidget* parent,
00051                                            TernaryCoordinatePlane* plane )
00052     : AbstractTernaryDiagram( new Private(), parent, plane )
00053 {
00054     init();
00055     setDatasetDimension( 3 ); // the third column is implicit
00056 }
00057 
00058 TernaryPointDiagram::~TernaryPointDiagram()
00059 {
00060 }
00061 
00062 void TernaryPointDiagram::init()
00063 {
00064     d->reverseMapper.setDiagram( this );
00065 }
00066 
00067 void  TernaryPointDiagram::resize (const QSizeF& area)
00068 {
00069     Q_UNUSED( area );
00070 }
00071 
00072 void  TernaryPointDiagram::paint (PaintContext *paintContext)
00073 {
00074     d->reverseMapper.clear();
00075 
00076     d->paint( paintContext );
00077 
00078     // sanity checks:
00079     if ( model() == 0 ) return;
00080 
00081     QPainter* p = paintContext->painter();
00082     PainterSaver s( p );
00083 
00084     TernaryCoordinatePlane* plane =
00085         (TernaryCoordinatePlane*) paintContext->coordinatePlane();
00086     Q_ASSERT( plane );
00087 
00088     double x, y, z;
00089 
00090     int columnCount = model()->columnCount( rootIndex() );
00091     for(int column=0; column<columnCount; column+=datasetDimension() )
00092     {
00093         int numrows = model()->rowCount( rootIndex() );
00094         for( int row = 0; row < numrows; row++ )
00095         {
00096             QModelIndex base = model()->index( row, column );
00097             // see if there is data otherwise skip
00098             if( ! model()->data( model()->index( row, column+0 ) ).isNull() )
00099             {
00100                 p->setPen( pen( base ) );
00101                 p->setBrush( brush( base ) );
00102 
00103                 // retrieve data
00104                 x = qMax( model()->data( model()->index( row, column+0 ) ).toDouble(),
00105                           0.0 );
00106                 y = qMax( model()->data( model()->index( row, column+1 ) ).toDouble(),
00107                           0.0 );
00108                 z = qMax( model()->data( model()->index( row, column+2 ) ).toDouble(),
00109                           0.0 );
00110 
00111                 // fix messed up data values (paint as much as possible)
00112                 double total = x + y + z;
00113                 if ( fabs( total ) > 3 * std::numeric_limits<double>::epsilon() ) {
00114                     TernaryPoint tPunkt( x / total, y / total );
00115                     QPointF diagramLocation = translate( tPunkt );
00116                     QPointF widgetLocation = plane->translate( diagramLocation );
00117 
00118                     paintMarker( p, model()->index( row, column ), widgetLocation );
00119                     QString text = tr( "(%1, %2, %3)" )
00120                                    .arg( x * 100, 0, 'f', 0 )
00121                                    .arg( y * 100, 0, 'f', 0 )
00122                                    .arg( z * 100, 0, 'f', 0 );
00123                     d->paintDataValueText( p, base, widgetLocation, text );
00124                 } else {
00125                     // ignore and do not paint this point, garbage data
00126                     qDebug() << "TernaryPointDiagram::paint: data point x/y/z:"
00127                              << x << "/" << y << "/" << z << "ignored, unusable.";
00128                 }
00129             }
00130         }
00131     }
00132 }
00133 
00134 const QPair< QPointF, QPointF >  TernaryPointDiagram::calculateDataBoundaries () const
00135 {
00136     // this is a constant, because we defined it to be one:
00137     static QPair<QPointF, QPointF> Boundaries(
00138         TriangleBottomLeft,
00139         QPointF( TriangleBottomRight.x(), TriangleHeight ) );
00140     return Boundaries;
00141 }
00142 

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