qwt_polar_panner.cpp

/******************************************************************************
 * 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_panner.h"
#include "qwt_polar_plot.h"
#include "qwt_polar_canvas.h"
#include "qwt_scale_div.h"
#include "qwt_point_polar.h"
 
QwtPolarPanner::QwtPolarPanner( QwtPolarCanvas* canvas )
    : QwtPanner( canvas )
{
    connect( this, SIGNAL(panned(int,int)),
        SLOT(movePlot(int,int)) );
}
 
QwtPolarPanner::~QwtPolarPanner()
{
}
 
QwtPolarCanvas* QwtPolarPanner::canvas()
{
    return qobject_cast< QwtPolarCanvas* >( parent() );
}
 
const QwtPolarCanvas* QwtPolarPanner::canvas() const
{
    return qobject_cast< const QwtPolarCanvas* >( parent() );
}
 
QwtPolarPlot* QwtPolarPanner::plot()
{
    QwtPolarCanvas* c = canvas();
    if ( c )
        return c->plot();
 
    return NULL;
}
 
const QwtPolarPlot* QwtPolarPanner::plot() const
{
    const QwtPolarCanvas* c = canvas();
    if ( c )
        return c->plot();
 
    return NULL;
}
 
void QwtPolarPanner::movePlot( int dx, int dy )
{
    QwtPolarPlot* plot = QwtPolarPanner::plot();
    if ( plot == NULL || ( dx == 0 && dy == 0 ) )
        return;
 
    const QwtScaleMap map = plot->scaleMap( QwtPolar::Radius );
 
    QwtPointPolar pos = plot->zoomPos();
    if ( map.s1() <= map.s2() )
    {
        pos.setRadius(
            map.transform( map.s1() + pos.radius() ) - map.p1() );
        pos.setPoint( pos.toPoint() - QPointF( dx, -dy ) );
        pos.setRadius(
            map.invTransform( map.p1() + pos.radius() ) - map.s1() );
    }
    else
    {
        pos.setRadius(
            map.transform( map.s1() - pos.radius() ) - map.p1() );
        pos.setPoint( pos.toPoint() - QPointF( dx, -dy ) );
        pos.setRadius(
            map.s1() - map.invTransform( map.p1() + pos.radius() ) );
    }
 
    const bool doAutoReplot = plot->autoReplot();
    plot->setAutoReplot( false );
 
    plot->zoom( pos, plot->zoomFactor() );
 
    plot->setAutoReplot( doAutoReplot );
    plot->replot();
}
 
void QwtPolarPanner::widgetMousePressEvent( QMouseEvent* event )
{
    const QwtPolarPlot* plot = QwtPolarPanner::plot();
    if ( plot )
    {
        if ( plot->zoomFactor() < 1.0 )
            QwtPanner::widgetMousePressEvent( event );
    }
}
 
#include "moc_qwt_polar_panner.cpp"