source: ntrip/trunk/BNC/qwtpolar/qwt_polar_marker.cpp@ 7987

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * QwtPolar Widget Library
 * Copyright (C) 2008   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#include "qwt_polar_marker.h"
#include "qwt_polar.h"
#include <qwt_scale_map.h>
#include <qwt_symbol.h>
#include <qwt_text.h>
#include <qpainter.h>

static const int LabelDist = 2;

class QwtPolarMarker::PrivateData
{
public:
    PrivateData():
        align( Qt::AlignCenter )
    {
        symbol = new QwtSymbol();
    }

    ~PrivateData()
    {
        delete symbol;
    }

    QwtText label;
    Qt::Alignment align;
    QPen pen;
    const QwtSymbol *symbol;

    QwtPointPolar pos;
};

//! Sets alignment to Qt::AlignCenter, and style to NoLine
QwtPolarMarker::QwtPolarMarker():
    QwtPolarItem( QwtText( "Marker" ) )
{
    d_data = new PrivateData;

    setItemAttribute( QwtPolarItem::AutoScale );
    setZ( 30.0 );
}

//! Destructor
QwtPolarMarker::~QwtPolarMarker()
{
    delete d_data;
}

//! \return QwtPolarItem::Rtti_PlotMarker
int QwtPolarMarker::rtti() const
{
    return QwtPolarItem::Rtti_PolarMarker;
}

//! \return Position of the marker
QwtPointPolar QwtPolarMarker::position() const
{
    return d_data->pos;
}

//! Change the position of the marker
void QwtPolarMarker::setPosition( const QwtPointPolar &pos )
{
    if ( d_data->pos != pos )
    {
        d_data->pos = pos;
        itemChanged();
    }
}

/*!
  Draw the marker

  \param painter Painter
  \param azimuthMap Maps azimuth values to values related to 0.0, M_2PI
  \param radialMap Maps radius values into painter coordinates.
  \param pole Position of the pole in painter coordinates
  \param radius Radius of the complete plot area in painter coordinates
  \param canvasRect Contents rect of the canvas in painter coordinates
*/
void QwtPolarMarker::draw( QPainter *painter,
    const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap,
    const QPointF &pole, double radius,
    const QRectF &canvasRect ) const
{
    Q_UNUSED( radius );
    Q_UNUSED( canvasRect );

    const double r = radialMap.transform( d_data->pos.radius() );
    const double a = azimuthMap.transform( d_data->pos.azimuth() );

    const QPointF pos = qwtPolar2Pos( pole, r, a );


    // draw symbol
    QSize sSym( 0, 0 );
    if ( d_data->symbol->style() != QwtSymbol::NoSymbol )
    {
        sSym = d_data->symbol->size();
        d_data->symbol->drawSymbol( painter, pos );
    }

    // draw label
    if ( !d_data->label.isEmpty() )
    {
        int xlw = qMax( int( d_data->pen.width() ), 1 );
        int ylw = xlw;

        int xlw1 = qMax( ( xlw + 1 ) / 2, ( sSym.width() + 1 ) / 2 ) + LabelDist;
        xlw = qMax( xlw / 2, ( sSym.width() + 1 ) / 2 ) + LabelDist;
        int ylw1 = qMax( ( ylw + 1 ) / 2, ( sSym.height() + 1 ) / 2 ) + LabelDist;
        ylw = qMax( ylw / 2, ( sSym. height() + 1 ) / 2 ) + LabelDist;

        QRect tr( QPoint( 0, 0 ), d_data->label.textSize( painter->font() ).toSize() );
        tr.moveCenter( QPoint( 0, 0 ) );

        int dx = pos.x();
        int dy = pos.y();

        if ( d_data->align & Qt::AlignTop )
            dy += tr.y() - ylw1;
        else if ( d_data->align & Qt::AlignBottom )
            dy -= tr.y() - ylw1;

        if ( d_data->align & Qt::AlignLeft )
            dx += tr.x() - xlw1;
        else if ( d_data->align & Qt::AlignRight )
            dx -= tr.x() - xlw1;

        tr.translate( dx, dy );
        d_data->label.draw( painter, tr );
    }
}

/*!
  \brief Assign a symbol
  \param symbol New symbol
  \sa symbol()
*/
void QwtPolarMarker::setSymbol( const QwtSymbol *symbol )
{
    if ( d_data->symbol != symbol )
    {
        delete d_data->symbol;
        d_data->symbol = symbol;
        itemChanged();
    }
}

/*!
  \return the symbol
  \sa setSymbol(), QwtSymbol
*/
const QwtSymbol *QwtPolarMarker::symbol() const
{
    return d_data->symbol;
}

/*!
  \brief Set the label
  \param label label text
  \sa label()
*/
void QwtPolarMarker::setLabel( const QwtText& label )
{
    if ( label != d_data->label )
    {
        d_data->label = label;
        itemChanged();
    }
}

/*!
  \return the label
  \sa setLabel()
*/
QwtText QwtPolarMarker::label() const
{
    return d_data->label;
}

/*!
  \brief Set the alignment of the label

  The alignment determines where the label is drawn relative to
  the marker's position.

  \param align Alignment. A combination of AlignTop, AlignBottom,
    AlignLeft, AlignRight, AlignCenter, AlgnHCenter,
    AlignVCenter.
  \sa labelAlignment()
*/
void QwtPolarMarker::setLabelAlignment( Qt::Alignment align )
{
    if ( align == d_data->align )
        return;

    d_data->align = align;
    itemChanged();
}

/*!
  \return the label alignment
  \sa setLabelAlignment()
*/
Qt::Alignment QwtPolarMarker::labelAlignment() const
{
    return d_data->align;
}

/*!
   Interval, that is necessary to display the item
   This interval can be useful for operations like clipping or autoscaling

   \param scaleId Scale index
   \return bounding interval ( == position )

   \sa position()
*/
QwtInterval QwtPolarMarker::boundingInterval( int scaleId ) const
{
    const double v = ( scaleId == QwtPolar::ScaleRadius )
        ? d_data->pos.radius() : d_data->pos.azimuth();

    return QwtInterval( v, v );
}