qwt_interval_symbol.cpp

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/* -*- 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
 *****************************************************************************/

#include "qwt_interval_symbol.h"
#include "qwt_painter.h"
#include "qwt_math.h"
#include <qpainter.h>

#if QT_VERSION < 0x040601
#define qAtan2(y, x) ::atan2(y, x)
#define qFastSin(x) qSin(x)
#define qFastCos(x) qCos(x)
#endif

class QwtIntervalSymbol::PrivateData
{
public:
    PrivateData():
        style( QwtIntervalSymbol::NoSymbol ),
        width( 6 )
    {
    }

    bool operator==( const PrivateData &other ) const
    {
        return ( style == other.style )
            && ( width == other.width )
            && ( brush == other.brush )
            && ( pen == other.pen );
    }

    QwtIntervalSymbol::Style style;
    int width;

    QPen pen;
    QBrush brush;
};

QwtIntervalSymbol::QwtIntervalSymbol( Style style )
{
    d_data = new PrivateData();
    d_data->style = style;
}

QwtIntervalSymbol::QwtIntervalSymbol( const QwtIntervalSymbol &other )
{
    d_data = new PrivateData();
    *d_data = *other.d_data;
}

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

QwtIntervalSymbol &QwtIntervalSymbol::operator=( 
    const QwtIntervalSymbol &other )
{
    *d_data = *other.d_data;
    return *this;
}

bool QwtIntervalSymbol::operator==( 
    const QwtIntervalSymbol &other ) const
{
    return *d_data == *other.d_data;
}

bool QwtIntervalSymbol::operator!=( 
    const QwtIntervalSymbol &other ) const
{
    return !( *d_data == *other.d_data );
}

void QwtIntervalSymbol::setStyle( Style style )
{
    d_data->style = style;
}

QwtIntervalSymbol::Style QwtIntervalSymbol::style() const
{
    return d_data->style;
}

void QwtIntervalSymbol::setWidth( int width )
{
    d_data->width = width;
}

int QwtIntervalSymbol::width() const
{
    return d_data->width;
}

void QwtIntervalSymbol::setBrush( const QBrush &brush )
{
    d_data->brush = brush;
}

const QBrush& QwtIntervalSymbol::brush() const
{
    return d_data->brush;
}

void QwtIntervalSymbol::setPen( const QColor &color, 
    qreal width, Qt::PenStyle style )
{   
    setPen( QPen( color, width, style ) );
}

void QwtIntervalSymbol::setPen( const QPen &pen )
{
    d_data->pen = pen;
}

const QPen& QwtIntervalSymbol::pen() const
{
    return d_data->pen;
}

void QwtIntervalSymbol::draw( QPainter *painter, Qt::Orientation orientation,
    const QPointF &from, const QPointF &to ) const
{
    const qreal pw = qMax( painter->pen().widthF(), qreal( 1.0 ) );

    QPointF p1 = from;
    QPointF p2 = to;
    if ( QwtPainter::roundingAlignment( painter ) )
    {
        p1 = p1.toPoint();
        p2 = p2.toPoint();
    }

    switch ( d_data->style )
    {
        case QwtIntervalSymbol::Bar:
        {
            QwtPainter::drawLine( painter, p1, p2 );
            if ( d_data->width > pw )
            {
                if ( ( orientation == Qt::Horizontal ) 
                    && ( p1.y() == p2.y() ) )
                {
                    const double sw = d_data->width;

                    const double y = p1.y() - sw / 2;
                    QwtPainter::drawLine( painter,
                        p1.x(), y, p1.x(), y + sw );
                    QwtPainter::drawLine( painter,
                        p2.x(), y, p2.x(), y + sw );
                }
                else if ( ( orientation == Qt::Vertical ) 
                    && ( p1.x() == p2.x() ) )
                {
                    const double sw = d_data->width;

                    const double x = p1.x() - sw / 2;
                    QwtPainter::drawLine( painter,
                        x, p1.y(), x + sw, p1.y() );
                    QwtPainter::drawLine( painter,
                        x, p2.y(), x + sw, p2.y() );
                }
                else
                {
                    const double sw = d_data->width;

                    const double dx = p2.x() - p1.x();
                    const double dy = p2.y() - p1.y();
                    const double angle = qAtan2( dy, dx ) + M_PI_2;
                    double dw2 = sw / 2.0;

                    const double cx = qFastCos( angle ) * dw2;
                    const double sy = qFastSin( angle ) * dw2;

                    QwtPainter::drawLine( painter,
                        p1.x() - cx, p1.y() - sy,
                        p1.x() + cx, p1.y() + sy );
                    QwtPainter::drawLine( painter,
                        p2.x() - cx, p2.y() - sy,
                        p2.x() + cx, p2.y() + sy );
                }
            }
            break;
        }
        case QwtIntervalSymbol::Box:
        {
            if ( d_data->width <= pw )
            {
                QwtPainter::drawLine( painter, p1, p2 );
            }
            else
            {
                if ( ( orientation == Qt::Horizontal ) 
                    && ( p1.y() == p2.y() ) )
                {
                    const double sw = d_data->width;

                    const double y = p1.y() - d_data->width / 2;
                    QwtPainter::drawRect( painter,
                        p1.x(), y, p2.x() - p1.x(),  sw );
                }
                else if ( ( orientation == Qt::Vertical )
                    && ( p1.x() == p2.x() ) )
                {
                    const double sw = d_data->width;

                    const double x = p1.x() - d_data->width / 2;
                    QwtPainter::drawRect( painter,
                        x, p1.y(), sw, p2.y() - p1.y() );
                }
                else
                {
                    const double sw = d_data->width;

                    const double dx = p2.x() - p1.x();
                    const double dy = p2.y() - p1.y();
                    const double angle = qAtan2( dy, dx ) + M_PI_2;
                    double dw2 = sw / 2.0;

                    const double cx = qFastCos( angle ) * dw2;
                    const double sy = qFastSin( angle ) * dw2;

                    QPolygonF polygon;
                    polygon += QPointF( p1.x() - cx, p1.y() - sy );
                    polygon += QPointF( p1.x() + cx, p1.y() + sy );
                    polygon += QPointF( p2.x() + cx, p2.y() + sy );
                    polygon += QPointF( p2.x() - cx, p2.y() - sy );

                    QwtPainter::drawPolygon( painter, polygon );
                }
            }
            break;
        }
        default:;
    }
}