Used to create a histogram that can be shown in a Qwt Plot. See QmitkHistogramWidget for an example of its usage. More...

#include <QmitkHistogram.h>

Inheritance diagram for QmitkHistogram:

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Collaboration diagram for QmitkHistogram:

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List of all members.

Classes
class	HistogramData
Public Member Functions
	QmitkHistogram (const QString &title=QString::null)
	QmitkHistogram (const QwtText &title)
virtual	~QmitkHistogram ()
void	setData (const QwtIntervalData &data)
const QwtIntervalData &	data () const
void	setColor (const QColor &)
QColor	color () const
virtual QwtDoubleRect	boundingRect () const
virtual void	draw (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &) const
	Draw the item.
void	setBaseline (double reference)
double	baseline () const
Protected Member Functions
virtual void	drawBar (QPainter *, Qt::Orientation o, const QRect &) const

Detailed Description

Used to create a histogram that can be shown in a Qwt Plot. See QmitkHistogramWidget for an example of its usage.

Definition at line 32 of file QmitkHistogram.h.

Constructor & Destructor Documentation

QmitkHistogram::QmitkHistogram ( const QString & title = QString::null ) [explicit]

Definition at line 39 of file QmitkHistogram.cpp.

                                                  :
QwtPlotItem(QwtText(title))
{
  init();
}

QmitkHistogram::QmitkHistogram ( const QwtText & title ) [explicit]

Definition at line 33 of file QmitkHistogram.cpp.

                                                  :
QwtPlotItem(title)
{
  init();
}

QmitkHistogram::~QmitkHistogram ( ) [virtual]

Definition at line 45 of file QmitkHistogram.cpp.

{
  delete m_Data;
}

Member Function Documentation

double QmitkHistogram::baseline ( ) const

Definition at line 70 of file QmitkHistogram.cpp.

References QmitkHistogram::HistogramData::reference.

Referenced by draw().

{
  return m_Data->reference;
}

QwtDoubleRect QmitkHistogram::boundingRect ( ) const [virtual]

Returns:: An invalid bounding rect: QwtDoubleRect(1.0, 1.0, -2.0, -2.0)

Reimplemented from QwtPlotItem.

Definition at line 100 of file QmitkHistogram.cpp.

References QwtDoubleRect::bottom(), QwtIntervalData::boundingRect(), QmitkHistogram::HistogramData::data, QwtDoubleRect::isValid(), QmitkHistogram::HistogramData::reference, QwtDoubleRect::setBottom(), QwtDoubleRect::setTop(), and QwtDoubleRect::top().

{
  QwtDoubleRect rect = m_Data->data.boundingRect();
  if ( !rect.isValid() ) 
    return rect;

  if ( rect.bottom() < m_Data->reference ) 
    rect.setBottom( m_Data->reference );
  else if ( rect.top() > m_Data->reference ) 
    rect.setTop( m_Data->reference );

  return rect;
}

QColor QmitkHistogram::color ( ) const

Definition at line 95 of file QmitkHistogram.cpp.

References QmitkHistogram::HistogramData::color.

Referenced by drawBar(), and setColor().

{
  return m_Data->color;
}

const QwtIntervalData & QmitkHistogram::data ( ) const

Definition at line 81 of file QmitkHistogram.cpp.

References QmitkHistogram::HistogramData::data.

Referenced by setData().

{
  return m_Data->data;
}

void QmitkHistogram::draw	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRect &	canvasRect
	)		const `[virtual]`

Draw the item.

Parameters:

painter	Painter
xMap	Maps x-values into pixel coordinates.
yMap	Maps y-values into pixel coordinates.
canvasRect	Contents rect of the canvas in painter coordinates

Implements QwtPlotItem.

Definition at line 114 of file QmitkHistogram.cpp.

References baseline(), QmitkHistogram::HistogramData::color, QmitkHistogram::HistogramData::data, drawBar(), int(), QwtIntervalData::interval(), QwtDoubleInterval::maxValue(), QwtDoubleInterval::minValue(), qwtMin, QwtIntervalData::size(), QwtScaleMap::transform(), and QwtIntervalData::value().

{
  const QwtIntervalData &iData = m_Data->data;

  painter->setPen(QPen(m_Data->color));

  //const int x0 = xMap.transform(baseline());
  const int y0 = yMap.transform(baseline());

  for ( int i = 0; i < (int)iData.size(); i++ )
  {
    const int y2 = yMap.transform(iData.value(i));
    if ( y2 == y0 )
      continue;

    int x1 = xMap.transform(iData.interval(i).minValue());
    int x2 = xMap.transform(iData.interval(i).maxValue());
    if ( x1 > x2 )
      qSwap(x1, x2);

    if ( i < (int)iData.size() - 2 )
    {
      const int xx1 = xMap.transform(iData.interval(i+1).minValue());
      const int xx2 = xMap.transform(iData.interval(i+1).maxValue());

      if ( x2 == qwtMin(xx1, xx2) )
      {
        const int yy2 = yMap.transform(iData.value(i+1));
        if ( yy2 != y0 && ( (yy2 < y0 && y2 < y0) ||
          (yy2 > y0 && y2 > y0) ) )
        {
          // One pixel distance between neighbored bars
          x2--;
        }
      }
    }
    drawBar(painter, Qt::Vertical,
      QRect(x1, y0, x2 - x1, y2 - y0) );
  }
}

void QmitkHistogram::drawBar	(	QPainter *	painter,
		Qt::Orientation	o,
		const QRect &	rect
	)		const `[protected, virtual]`

Definition at line 156 of file QmitkHistogram.cpp.

References color(), QwtPainter::drawLine(), and QwtPainter::drawRect().

Referenced by draw().

{
  painter->save();

  const QColor color(painter->pen().color());
#if QT_VERSION >= 0x040000
  const QRect r = rect.normalized();
#else
  const QRect r = rect.normalize();
#endif

  const int factor = 125;
  const QColor light(color.light(factor));
  const QColor dark(color.dark(factor));

  painter->setBrush(color);
  painter->setPen(Qt::NoPen);
  QwtPainter::drawRect(painter, r.x() + 1, r.y() + 1,
    r.width() - 2, r.height() - 2);
  painter->setBrush(Qt::NoBrush);

  painter->setPen(QPen(light, 2));
#if QT_VERSION >= 0x040000
  QwtPainter::drawLine(painter,
    r.left() + 1, r.top() + 2, r.right() + 1, r.top() + 2);
#else
  QwtPainter::drawLine(painter,
    r.left(), r.top() + 2, r.right() + 1, r.top() + 2);
#endif

  painter->setPen(QPen(dark, 2));
#if QT_VERSION >= 0x040000
  QwtPainter::drawLine(painter, 
    r.left() + 1, r.bottom(), r.right() + 1, r.bottom());
#else
  QwtPainter::drawLine(painter, 
    r.left(), r.bottom(), r.right() + 1, r.bottom());
#endif

  painter->setPen(QPen(light, 1));

#if QT_VERSION >= 0x040000
  QwtPainter::drawLine(painter, 
    r.left(), r.top() + 1, r.left(), r.bottom());
  QwtPainter::drawLine(painter,
    r.left() + 1, r.top() + 2, r.left() + 1, r.bottom() - 1);
#else
  QwtPainter::drawLine(painter, 
    r.left(), r.top() + 1, r.left(), r.bottom() + 1);
  QwtPainter::drawLine(painter,
    r.left() + 1, r.top() + 2, r.left() + 1, r.bottom());
#endif

  painter->setPen(QPen(dark, 1));

#if QT_VERSION >= 0x040000
  QwtPainter::drawLine(painter, 
    r.right() + 1, r.top() + 1, r.right() + 1, r.bottom());
  QwtPainter::drawLine(painter, 
    r.right(), r.top() + 2, r.right(), r.bottom() - 1);
#else
  QwtPainter::drawLine(painter, 
    r.right() + 1, r.top() + 1, r.right() + 1, r.bottom() + 1);
  QwtPainter::drawLine(painter, 
    r.right(), r.top() + 2, r.right(), r.bottom());
#endif

  painter->restore();
}

void QmitkHistogram::setBaseline ( double reference )

Definition at line 61 of file QmitkHistogram.cpp.

References QwtPlotItem::itemChanged(), and QmitkHistogram::HistogramData::reference.

{
  if ( m_Data->reference != reference )
  {
    m_Data->reference = reference;
    itemChanged();
  }
}

void QmitkHistogram::setColor ( const QColor & color )

Definition at line 86 of file QmitkHistogram.cpp.

References color(), QmitkHistogram::HistogramData::color, and QwtPlotItem::itemChanged().

Referenced by QmitkHistogramWidget::SetHistogram().

{
  if ( m_Data->color != color )
  {
    m_Data->color = color;
    itemChanged();
  }
}

void QmitkHistogram::setData ( const QwtIntervalData & data )

Definition at line 75 of file QmitkHistogram.cpp.

References data(), QmitkHistogram::HistogramData::data, and QwtPlotItem::itemChanged().

Referenced by QmitkHistogramWidget::SetHistogram().

{
  m_Data->data = data;
  itemChanged();
}

The documentation for this class was generated from the following files:

QmitkHistogram Class Reference

Classes

Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation