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119 lines
2.9 KiB
C++
119 lines
2.9 KiB
C++
3 weeks ago
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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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* QwtPolar Widget Library
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* Copyright (C) 2008 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#include "qwt_polar_panner.h"
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#include "qwt_polar_plot.h"
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#include "qwt_polar_canvas.h"
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#include <qwt_scale_div.h>
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#include <qwt_point_polar.h>
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//! Create a plot panner for a polar plot canvas
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QwtPolarPanner::QwtPolarPanner( QwtPolarCanvas *canvas ):
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QwtPanner( canvas )
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{
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connect( this, SIGNAL( panned( int, int ) ),
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SLOT( movePlot( int, int ) ) );
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}
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//! Destructor
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QwtPolarPanner::~QwtPolarPanner()
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{
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}
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//! \return observed plot canvas
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QwtPolarCanvas *QwtPolarPanner::canvas()
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{
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return qobject_cast<QwtPolarCanvas *>( parent() );
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}
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//! \return observed plot canvas
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const QwtPolarCanvas *QwtPolarPanner::canvas() const
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{
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return qobject_cast<const QwtPolarCanvas *>( parent() );
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}
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//! \return observed plot
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QwtPolarPlot *QwtPolarPanner::plot()
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{
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QwtPolarCanvas *c = canvas();
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if ( c )
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return c->plot();
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return NULL;
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}
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//! \return observed plot
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const QwtPolarPlot *QwtPolarPanner::plot() const
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{
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const QwtPolarCanvas *c = canvas();
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if ( c )
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return c->plot();
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return NULL;
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}
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/*!
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Adjust the zoomed area according to dx/dy
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\param dx Pixel offset in x direction
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\param dy Pixel offset in y direction
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\sa QwtPanner::panned(), QwtPolarPlot::zoom()
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*/
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void QwtPolarPanner::movePlot( int dx, int dy )
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{
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QwtPolarPlot *plot = QwtPolarPanner::plot();
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if ( plot == NULL || ( dx == 0 && dy == 0 ) )
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return;
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const QwtScaleMap map = plot->scaleMap( QwtPolar::Radius );
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QwtPointPolar pos = plot->zoomPos();
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if ( map.s1() <= map.s2() )
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{
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pos.setRadius(
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map.transform( map.s1() + pos.radius() ) - map.p1() );
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pos.setPoint( pos.toPoint() - QPointF( dx, -dy ) );
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pos.setRadius(
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map.invTransform( map.p1() + pos.radius() ) - map.s1() );
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}
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else
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{
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pos.setRadius(
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map.transform( map.s1() - pos.radius() ) - map.p1() );
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pos.setPoint( pos.toPoint() - QPointF( dx, -dy ) );
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pos.setRadius(
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map.s1() - map.invTransform( map.p1() + pos.radius() ) );
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}
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const bool doAutoReplot = plot->autoReplot();
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plot->setAutoReplot( false );
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plot->zoom( pos, plot->zoomFactor() );
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plot->setAutoReplot( doAutoReplot );
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plot->replot();
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}
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/*!
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Block panning when the plot zoom factor is >= 1.0.
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\param event Mouse event
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*/
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void QwtPolarPanner::widgetMousePressEvent( QMouseEvent *event )
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{
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const QwtPolarPlot *plot = QwtPolarPanner::plot();
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if ( plot )
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{
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if ( plot->zoomFactor() < 1.0 )
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QwtPanner::widgetMousePressEvent( event );
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}
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}
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