KDChartNormalLineDiagram_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 <QAbstractItemModel>
00031 
00032 #include "KDChartBarDiagram.h"
00033 #include "KDChartLineDiagram.h"
00034 #include "KDChartTextAttributes.h"
00035 #include "KDChartAttributesModel.h"
00036 #include "KDChartAbstractCartesianDiagram.h"
00037 #include "KDChartNormalLineDiagram_p.h"
00038 
00039 using namespace KDChart;
00040 
00041 NormalLineDiagram::NormalLineDiagram( LineDiagram* d )
00042     : LineDiagramType( d )
00043 {
00044 }
00045 
00046 LineDiagram::LineType NormalLineDiagram::type() const
00047 {
00048     return LineDiagram::Normal;
00049 }
00050 
00051 const QPair< QPointF, QPointF > NormalLineDiagram::calculateDataBoundaries() const
00052 {
00053     const int rowCount = compressor().modelDataRows();
00054     const int colCount = compressor().modelDataColumns();
00055     double xMin = 0;
00056     double xMax = diagram()->model() ? diagram()->model()->rowCount( diagram()->rootIndex() ) - 1 : 0;
00057     double yMin = 0;
00058     double yMax = 0;
00059 
00060     bool first = true;
00061     for( int column = 0; column < colCount; ++column )
00062     {
00063         for ( int row = 0; row < rowCount; ++row )
00064         {
00065             const CartesianDiagramDataCompressor::CachePosition position( row, column );
00066             const CartesianDiagramDataCompressor::DataPoint point = compressor().data( position );
00067 
00068             if ( first ) {
00069                     yMin = point.value;
00070                     yMax = point.value;
00071             } else {
00072                 yMin = qMin( yMin, point.value );
00073                 yMax = qMax( yMax, point.value );
00074             }
00075 
00076             first = false;
00077         }
00078     }
00079 
00080     const QPointF bottomLeft( QPointF( xMin, qMin( 0.0, yMin ) ) );
00081     const QPointF topRight( QPointF( xMax, yMax ) );
00082     return QPair< QPointF, QPointF >( bottomLeft, topRight );
00083 }
00084 
00085 void NormalLineDiagram::paint( PaintContext* ctx )
00086 {
00087     reverseMapper().clear();
00088     Q_ASSERT( dynamic_cast<CartesianCoordinatePlane*>( ctx->coordinatePlane() ) );
00089     CartesianCoordinatePlane* plane = static_cast<CartesianCoordinatePlane*>( ctx->coordinatePlane() );
00090     const int columnCount = compressor().modelDataColumns();
00091     const int rowCount = compressor().modelDataRows();
00092     if ( columnCount == 0 || rowCount == 0 ) return; // maybe blank out the area?
00093 
00094 // FIXME integrate column index retrieval to compressor:
00095 // the compressor should only pass through visiblel columns
00096     int maxFound = 0;
00097 //     {   // find the last column number that is not hidden
00098 //         for( int column =  datasetDimension() - 1;
00099 //              column <  columnCount;
00100 //              column += datasetDimension() )
00101 //             if( ! diagram()->isHidden( column ) )
00102 //                 maxFound = column;
00103 //     }
00104     maxFound = columnCount;
00105     // ^^^ temp
00106 
00107     DataValueTextInfoList textInfoList;
00108     LineAttributesInfoList lineList;
00109     LineAttributes::MissingValuesPolicy policy; // ???
00110 
00111     for( int column  = 0; column < columnCount; ++column ) {
00112         LineAttributes laPreviousCell;
00113         CartesianDiagramDataCompressor::CachePosition previousCellPosition;
00114 
00115         for ( int row = 0; row < rowCount; ++row ) {
00116             const CartesianDiagramDataCompressor::CachePosition position( row, column );
00117             // get where to draw the line from:
00118             const CartesianDiagramDataCompressor::DataPoint point = compressor().data( position );
00119             LineAttributes laCell;
00120             if ( row > 0 ) { // position 0 is not really painted, since it takes two points to make a line :-)
00121                 const QModelIndex sourceIndex = attributesModel()->mapToSource( point.index );
00122                 const CartesianDiagramDataCompressor::DataPoint lastPoint = compressor().data( previousCellPosition );
00123                 // area corners, a + b are the line ends:
00124                 const QPointF a( plane->translate( QPointF( lastPoint.key, lastPoint.value ) ) );
00125                 const QPointF b( plane->translate( QPointF( point.key, point.value ) ) );
00126                 const QPointF c( plane->translate( QPointF( lastPoint.key, 0.0 ) ) );
00127                 const QPointF d( plane->translate( QPointF( point.key, 0.0 ) ) );
00128                 // add the line to the list:
00129                 laCell = diagram()->lineAttributes( sourceIndex );
00130                 // add data point labels:
00131                 const PositionPoints pts = PositionPoints( b, a, d, c );
00132                 // if necessary, add the area to the area list:
00133                 QList<QPolygonF> areas;
00134                 if ( laCell.displayArea() ) {
00135                     QPolygonF polygon;
00136                     polygon << a << b << d << c;
00137                     areas << polygon;
00138                 }
00139                 // add the pieces to painting if this is not hidden:
00140                 if ( ! point.hidden ) {
00141                     appendDataValueTextInfoToList( diagram(), textInfoList, sourceIndex, pts,
00142                                                    Position::NorthWest, Position::SouthWest,
00143                                                    point.value );
00144                     paintAreas( ctx, attributesModel()->mapToSource( lastPoint.index ), areas, laCell.transparency() );
00145                     lineList.append( LineAttributesInfo( sourceIndex, a, b ) );
00146                 }
00147             }
00148             // wrap it up:
00149             previousCellPosition = position;
00150             laPreviousCell = laCell;
00151         }
00152     }
00153 
00154     paintElements( ctx, textInfoList, lineList, policy );
00155 }

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