qgsticksscalebarstyle.cpp

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/***************************************************************************
                            qgsticksscalebarstyle.cpp
                            -------------------------
    begin                : June 2008
    copyright            : (C) 2008 by Marco Hugentobler
    email                : marco.hugentobler@karto.baug.ethz.ch
 ***************************************************************************/
/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#include "qgsticksscalebarstyle.h"
#include "qgscomposerscalebar.h"
#include "qgscomposerutils.h"
#include <QPainter>

QgsTicksScaleBarStyle::QgsTicksScaleBarStyle( const QgsComposerScaleBar* bar ): QgsScaleBarStyle( bar )
{
  mTickPosition = TicksMiddle;
}

QgsTicksScaleBarStyle::QgsTicksScaleBarStyle(): QgsScaleBarStyle( 0 )
{
  mTickPosition = TicksMiddle;
}

QgsTicksScaleBarStyle::~QgsTicksScaleBarStyle()
{

}

QString QgsTicksScaleBarStyle::name() const
{
  switch ( mTickPosition )
  {
    case TicksUp:
      return "Line Ticks Up";
    case TicksDown:
      return "Line Ticks Down";
    case TicksMiddle:
      return "Line Ticks Middle";
  }
  return "";  // to make gcc happy
}

void QgsTicksScaleBarStyle::draw( QPainter* p, double xOffset ) const
{
  if ( !mScaleBar )
  {
    return;
  }
  double barTopPosition = QgsComposerUtils::fontAscentMM( mScaleBar->font() ) + mScaleBar->labelBarSpace() + mScaleBar->boxContentSpace();
  double middlePosition = barTopPosition + mScaleBar->height() / 2.0;
  double bottomPosition = barTopPosition + mScaleBar->height();

  p->save();
  //antialiasing on
  p->setRenderHint( QPainter::Antialiasing, true );
  p->setPen( mScaleBar->pen() );

  QList<QPair<double, double> > segmentInfo;
  mScaleBar->segmentPositions( segmentInfo );

  QList<QPair<double, double> >::const_iterator segmentIt = segmentInfo.constBegin();
  for ( ; segmentIt != segmentInfo.constEnd(); ++segmentIt )
  {
    p->drawLine( QLineF( segmentIt->first + xOffset, barTopPosition, segmentIt->first + xOffset, barTopPosition + mScaleBar->height() ) );
  }

  //draw last tick and horizontal line
  if ( !segmentInfo.isEmpty() )
  {
    double lastTickPositionX = segmentInfo.last().first + mScaleBar->segmentMillimeters() + xOffset;
    double verticalPos;
    switch ( mTickPosition )
    {
      case TicksDown:
        verticalPos = barTopPosition;
        break;
      case TicksMiddle:
        verticalPos = middlePosition;
        break;
      case TicksUp:
        verticalPos = bottomPosition;
        break;
    }
    //horizontal line
    p->drawLine( QLineF( xOffset + segmentInfo.at( 0 ).first, verticalPos, lastTickPositionX, verticalPos ) );
    //last vertical line
    p->drawLine( QLineF( lastTickPositionX, barTopPosition, lastTickPositionX, barTopPosition + mScaleBar->height() ) );
  }

  p->restore();

  //draw labels using the default method
  drawLabels( p );
}