Quantum GIS API Documentation  1.7.4
src/core/composer/qgsdoubleboxscalebarstyle.cpp
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00001 /***************************************************************************
00002                             qgsdoubleboxscalebarstyle.cpp
00003                             -----------------------------
00004     begin                : June 2008
00005     copyright            : (C) 2008 by Marco Hugentobler
00006     email                : marco.hugentobler@karto.baug.ethz.ch
00007  ***************************************************************************/
00008 /***************************************************************************
00009  *                                                                         *
00010  *   This program is free software; you can redistribute it and/or modify  *
00011  *   it under the terms of the GNU General Public License as published by  *
00012  *   the Free Software Foundation; either version 2 of the License, or     *
00013  *   (at your option) any later version.                                   *
00014  *                                                                         *
00015  ***************************************************************************/
00016 
00017 #include "qgsdoubleboxscalebarstyle.h"
00018 #include "qgscomposerscalebar.h"
00019 #include <QList>
00020 #include <QPainter>
00021 
00022 QgsDoubleBoxScaleBarStyle::QgsDoubleBoxScaleBarStyle( const QgsComposerScaleBar* bar ): QgsScaleBarStyle( bar )
00023 {
00024 
00025 }
00026 
00027 QgsDoubleBoxScaleBarStyle::QgsDoubleBoxScaleBarStyle(): QgsScaleBarStyle( 0 )
00028 {
00029 
00030 }
00031 
00032 QgsDoubleBoxScaleBarStyle::~QgsDoubleBoxScaleBarStyle()
00033 {
00034 
00035 }
00036 
00037 QString QgsDoubleBoxScaleBarStyle::name() const
00038 {
00039   return "Double Box";
00040 }
00041 
00042 void QgsDoubleBoxScaleBarStyle::draw( QPainter* p, double xOffset ) const
00043 {
00044   if ( !mScaleBar )
00045   {
00046     return;
00047   }
00048   double barTopPosition = mScaleBar->fontAscentMillimeters( mScaleBar->font() ) + mScaleBar->labelBarSpace() + mScaleBar->boxContentSpace();
00049   double segmentHeight = mScaleBar->height() / 2;
00050 
00051   p->save();
00052   p->setPen( p->pen() );
00053 
00054   QList<QPair<double, double> > segmentInfo;
00055   mScaleBar->segmentPositions( segmentInfo );
00056 
00057   bool useColor = true; //alternate brush color/white
00058 
00059 
00060 
00061   QList<QPair<double, double> >::const_iterator segmentIt = segmentInfo.constBegin();
00062   for ( ; segmentIt != segmentInfo.constEnd(); ++segmentIt )
00063   {
00064     //draw top half
00065     if ( useColor )
00066     {
00067       p->setBrush( mScaleBar->brush() );
00068     }
00069     else //white
00070     {
00071       p->setBrush( QColor( 255, 255, 255 ) );
00072     }
00073 
00074     QRectF segmentRectTop( segmentIt->first + xOffset, barTopPosition, segmentIt->second, segmentHeight );
00075     p->drawRect( segmentRectTop );
00076 
00077     //draw bottom half
00078     if ( useColor )
00079     {
00080       p->setBrush( QColor( 255, 255, 255 ) );
00081     }
00082     else //white
00083     {
00084       p->setBrush( mScaleBar->brush() );
00085     }
00086 
00087     QRectF segmentRectBottom( segmentIt->first + xOffset, barTopPosition + segmentHeight, segmentIt->second, segmentHeight );
00088     p->drawRect( segmentRectBottom );
00089     useColor = !useColor;
00090   }
00091 
00092   p->restore();
00093 
00094   //draw labels using the default method
00095   drawLabels( p );
00096 }
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