qwt_polar_marker.cpp

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/* -*- 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;
};

QwtPolarMarker::QwtPolarMarker():
    QwtPolarItem( QwtText( "Marker" ) )
{
    d_data = new PrivateData;

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

QwtPolarMarker::~QwtPolarMarker()
{
    delete d_data;
}

int QwtPolarMarker::rtti() const
{
    return QwtPolarItem::Rtti_PolarMarker;
}

QwtPointPolar QwtPolarMarker::position() const
{
    return d_data->pos;
}

void QwtPolarMarker::setPosition( const QwtPointPolar &pos )
{
    if ( d_data->pos != pos )
    {
        d_data->pos = pos;
        itemChanged();
    }
}

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 );
    }
}

void QwtPolarMarker::setSymbol( const QwtSymbol *symbol )
{
    if ( d_data->symbol != symbol )
    {
        delete d_data->symbol;
        d_data->symbol = symbol;
        itemChanged();
    }
}

const QwtSymbol *QwtPolarMarker::symbol() const
{
    return d_data->symbol;
}

void QwtPolarMarker::setLabel( const QwtText& label )
{
    if ( label != d_data->label )
    {
        d_data->label = label;
        itemChanged();
    }
}

QwtText QwtPolarMarker::label() const
{
    return d_data->label;
}

void QwtPolarMarker::setLabelAlignment( Qt::Alignment align )
{
    if ( align == d_data->align )
        return;

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

Qt::Alignment QwtPolarMarker::labelAlignment() const
{
    return d_data->align;
}

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

    return QwtInterval( v, v );
}