qwt_compass.cpp

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   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
 *****************************************************************************/

// vim: expandtab

#include <math.h>
#include <qpainter.h>
#include <qpixmap.h>
#include <qevent.h>
#include "qwt_math.h"
#include "qwt_scale_draw.h"
#include "qwt_paint_buffer.h"
#include "qwt_painter.h"
#include "qwt_dial_needle.h"
#include "qwt_compass_rose.h"
#include "qwt_compass.h"

class QwtCompass::PrivateData
{
public:
    PrivateData():
        rose(NULL)
    {
    }

    ~PrivateData()
    {
        delete rose;
    }

    QwtCompassRose *rose;
    QMap<double, QString> labelMap;
};

QwtCompass::QwtCompass(QWidget* parent):
    QwtDial(parent)
{
    initCompass();
}

#if QT_VERSION < 0x040000

QwtCompass::QwtCompass(QWidget* parent, const char *name):
    QwtDial(parent, name)
{
    initCompass();
}

#endif

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

void QwtCompass::initCompass()
{
    d_data = new PrivateData;

    setScaleOptions(ScaleLabel); // Only labels, no backbone, no ticks

    setOrigin(270.0);
    setWrapping(true);


    d_data->labelMap.insert(0.0, QString::fromLatin1("N"));
    d_data->labelMap.insert(45.0, QString::fromLatin1("NE"));
    d_data->labelMap.insert(90.0, QString::fromLatin1("E"));
    d_data->labelMap.insert(135.0, QString::fromLatin1("SE"));
    d_data->labelMap.insert(180.0, QString::fromLatin1("S"));
    d_data->labelMap.insert(225.0, QString::fromLatin1("SW"));
    d_data->labelMap.insert(270.0, QString::fromLatin1("W"));
    d_data->labelMap.insert(315.0, QString::fromLatin1("NW"));

#if 0
    d_data->labelMap.insert(22.5, QString::fromLatin1("NNE"));
    d_data->labelMap.insert(67.5, QString::fromLatin1("NEE"));
    d_data->labelMap.insert(112.5, QString::fromLatin1("SEE"));
    d_data->labelMap.insert(157.5, QString::fromLatin1("SSE"));
    d_data->labelMap.insert(202.5, QString::fromLatin1("SSW"));
    d_data->labelMap.insert(247.5, QString::fromLatin1("SWW"));
    d_data->labelMap.insert(292.5, QString::fromLatin1("NWW"));
    d_data->labelMap.insert(337.5, QString::fromLatin1("NNW"));
#endif
}

void QwtCompass::drawScaleContents(QPainter *painter, 
        const QPoint &center, int radius) const
{
    QPalette::ColorGroup cg;
    if ( isEnabled() )
        cg = hasFocus() ? QPalette::Active : QPalette::Inactive;
    else
        cg = QPalette::Disabled;

    double north = origin();
    if ( isValid() )
    {
        if ( mode() == RotateScale )
            north -= value(); 
    }

    const int margin = 4;
    drawRose(painter, center, radius - margin, 360.0 - north,  cg);
}

void QwtCompass::drawRose(QPainter *painter, const QPoint &center,
    int radius, double north, QPalette::ColorGroup cg) const
{
    if ( d_data->rose )
        d_data->rose->draw(painter, center, radius, north,  cg);
}

void QwtCompass::setRose(QwtCompassRose *rose)
{
    if ( rose != d_data->rose )
    {
        if ( d_data->rose )
            delete d_data->rose;

        d_data->rose = rose;
        update();
    }
}

const QwtCompassRose *QwtCompass::rose() const 
{ 
    return d_data->rose; 
}

QwtCompassRose *QwtCompass::rose() 
{ 
    return d_data->rose; 
}

void QwtCompass::keyPressEvent(QKeyEvent *kev) 
{
    if (isReadOnly()) 
        return;

#if 0
    if ( kev->key() == Key_5 )
    {
        invalidate(); // signal ???
        return;
    }
#endif

    double newValue = value();

    if ( kev->key() >= Qt::Key_1 && kev->key() <= Qt::Key_9 )
    {
        if ( mode() != RotateNeedle || kev->key() == Qt::Key_5 )
            return;

        switch (kev->key()) 
        {
            case Qt::Key_6: 
                newValue = 180.0 * 0.0;
                break;
            case Qt::Key_3: 
                newValue = 180.0 * 0.25;
                break;
            case Qt::Key_2: 
                newValue = 180.0 * 0.5;
                break;
            case Qt::Key_1: 
                newValue = 180.0 * 0.75;
                break;
            case Qt::Key_4: 
                newValue = 180.0 * 1.0;
                break;
            case Qt::Key_7: 
                newValue = 180.0 * 1.25;
                break;
            case Qt::Key_8: 
                newValue = 180.0 * 1.5;
                break;
            case Qt::Key_9: 
                newValue = 180.0 * 1.75;
                break;
        }
        newValue -= origin();
        setValue(newValue);
    }
    else
    {
        QwtDial::keyPressEvent(kev);
    }
}

const QMap<double, QString> &QwtCompass::labelMap() const 
{ 
    return d_data->labelMap; 
}

QMap<double, QString> &QwtCompass::labelMap() 
{ 
    return d_data->labelMap; 
}

void QwtCompass::setLabelMap(const QMap<double, QString> &map) 
{ 
    d_data->labelMap = map; 
}

QwtText QwtCompass::scaleLabel(double value) const
{
#if 0
    // better solution ???
    if ( value == -0 )
        value = 0.0;
#endif

    if ( value < 0.0 )
        value += 360.0;

    if ( d_data->labelMap.contains(value) )
        return d_data->labelMap[value];

    return QwtText();
}

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