mirror of
https://github.com/qgis/QGIS.git
synced 2025-10-05 00:09:32 -04:00
33fc476d89
* require qwt >=6.2 (and fallback to internal 6.3 if system's qwt doesn't suffice) * debian doesn't have qwt for Qt6 and won't have it for trixie
119 lines
2.9 KiB
C++
119 lines
2.9 KiB
C++
/******************************************************************************
|
|
* 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"
|
|
|
|
//! Create a plot panner for a polar plot canvas
|
|
QwtPolarPanner::QwtPolarPanner( QwtPolarCanvas* canvas )
|
|
: QwtPanner( canvas )
|
|
{
|
|
connect( this, SIGNAL(panned(int,int)),
|
|
SLOT(movePlot(int,int)) );
|
|
}
|
|
|
|
//! Destructor
|
|
QwtPolarPanner::~QwtPolarPanner()
|
|
{
|
|
}
|
|
|
|
//! \return observed plot canvas
|
|
QwtPolarCanvas* QwtPolarPanner::canvas()
|
|
{
|
|
return qobject_cast< QwtPolarCanvas* >( parent() );
|
|
}
|
|
|
|
//! \return observed plot canvas
|
|
const QwtPolarCanvas* QwtPolarPanner::canvas() const
|
|
{
|
|
return qobject_cast< const QwtPolarCanvas* >( parent() );
|
|
}
|
|
|
|
//! \return observed plot
|
|
QwtPolarPlot* QwtPolarPanner::plot()
|
|
{
|
|
QwtPolarCanvas* c = canvas();
|
|
if ( c )
|
|
return c->plot();
|
|
|
|
return NULL;
|
|
}
|
|
|
|
//! \return observed plot
|
|
const QwtPolarPlot* QwtPolarPanner::plot() const
|
|
{
|
|
const QwtPolarCanvas* c = canvas();
|
|
if ( c )
|
|
return c->plot();
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*!
|
|
Adjust the zoomed area according to dx/dy
|
|
|
|
\param dx Pixel offset in x direction
|
|
\param dy Pixel offset in y direction
|
|
|
|
\sa QwtPanner::panned(), QwtPolarPlot::zoom()
|
|
*/
|
|
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();
|
|
}
|
|
|
|
/*!
|
|
Block panning when the plot zoom factor is >= 1.0.
|
|
|
|
\param event Mouse event
|
|
*/
|
|
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"
|