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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_plot_panner.h"
#include "qwt_scale_div.h"
#include "qwt_plot.h"
#include "qwt_painter.h"
#include <qbitmap.h>
#include <qstyle.h>
#include <qstyleoption.h>
static QBitmap qwtBorderMask( const QWidget *canvas, const QSize &size )
{
const QRect r( 0, 0, size.width(), size.height() );
QPainterPath borderPath;
( void )QMetaObject::invokeMethod(
const_cast< QWidget *>( canvas ), "borderPath", Qt::DirectConnection,
Q_RETURN_ARG( QPainterPath, borderPath ), Q_ARG( QRect, r ) );
if ( borderPath.isEmpty() )
{
if ( canvas->contentsRect() == canvas->rect() )
return QBitmap();
QBitmap mask( size );
mask.fill( Qt::color0 );
QPainter painter( &mask );
painter.fillRect( canvas->contentsRect(), Qt::color1 );
return mask;
}
QImage image( size, QImage::Format_ARGB32_Premultiplied );
image.fill( Qt::color0 );
QPainter painter( &image );
painter.setClipPath( borderPath );
painter.fillRect( r, Qt::color1 );
// now erase the frame
painter.setCompositionMode( QPainter::CompositionMode_DestinationOut );
if ( canvas->testAttribute(Qt::WA_StyledBackground ) )
{
QStyleOptionFrame opt;
opt.initFrom(canvas);
opt.rect = r;
canvas->style()->drawPrimitive( QStyle::PE_Frame, &opt, &painter, canvas );
}
else
{
const QVariant borderRadius = canvas->property( "borderRadius" );
const QVariant frameWidth = canvas->property( "frameWidth" );
if ( borderRadius.type() == QVariant::Double
&& frameWidth.type() == QVariant::Int )
{
const double br = borderRadius.toDouble();
const int fw = frameWidth.toInt();
if ( br > 0.0 && fw > 0 )
{
painter.setPen( QPen( Qt::color1, fw ) );
painter.setBrush( Qt::NoBrush );
painter.setRenderHint( QPainter::Antialiasing, true );
painter.drawPath( borderPath );
}
}
}
painter.end();
const QImage mask = image.createMaskFromColor(
QColor( Qt::color1 ).rgb(), Qt::MaskOutColor );
return QBitmap::fromImage( mask );
}
class QwtPlotPanner::PrivateData
{
public:
PrivateData()
{
for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
isAxisEnabled[axis] = true;
}
bool isAxisEnabled[QwtPlot::axisCnt];
};
/*!
\brief A panner for the canvas of a QwtPlot
The panner is enabled for all axes
\param canvas Plot canvas to pan, also the parent object
\sa setAxisEnabled()
*/
QwtPlotPanner::QwtPlotPanner( QWidget *canvas ):
QwtPanner( canvas )
{
d_data = new PrivateData();
connect( this, SIGNAL( panned( int, int ) ),
SLOT( moveCanvas( int, int ) ) );
}
//! Destructor
QwtPlotPanner::~QwtPlotPanner()
{
delete d_data;
}
/*!
\brief En/Disable an axis
Axes that are enabled will be synchronized to the
result of panning. All other axes will remain unchanged.
\param axis Axis, see QwtPlot::Axis
\param on On/Off
\sa isAxisEnabled(), moveCanvas()
*/
void QwtPlotPanner::setAxisEnabled( int axis, bool on )
{
if ( axis >= 0 && axis < QwtPlot::axisCnt )
d_data->isAxisEnabled[axis] = on;
}
/*!
Test if an axis is enabled
\param axis Axis, see QwtPlot::Axis
\return True, if the axis is enabled
\sa setAxisEnabled(), moveCanvas()
*/
bool QwtPlotPanner::isAxisEnabled( int axis ) const
{
if ( axis >= 0 && axis < QwtPlot::axisCnt )
return d_data->isAxisEnabled[axis];
return true;
}
//! Return observed plot canvas
QWidget *QwtPlotPanner::canvas()
{
return parentWidget();
}
//! Return Observed plot canvas
const QWidget *QwtPlotPanner::canvas() const
{
return parentWidget();
}
//! Return plot widget, containing the observed plot canvas
QwtPlot *QwtPlotPanner::plot()
{
QWidget *w = canvas();
if ( w )
w = w->parentWidget();
return qobject_cast<QwtPlot *>( w );
}
//! Return plot widget, containing the observed plot canvas
const QwtPlot *QwtPlotPanner::plot() const
{
const QWidget *w = canvas();
if ( w )
w = w->parentWidget();
return qobject_cast<const QwtPlot *>( w );
}
/*!
Adjust the enabled axes according to dx/dy
\param dx Pixel offset in x direction
\param dy Pixel offset in y direction
\sa QwtPanner::panned()
*/
void QwtPlotPanner::moveCanvas( int dx, int dy )
{
if ( dx == 0 && dy == 0 )
return;
QwtPlot *plot = this->plot();
if ( plot == NULL )
return;
const bool doAutoReplot = plot->autoReplot();
plot->setAutoReplot( false );
for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
{
if ( !d_data->isAxisEnabled[axis] )
continue;
const QwtScaleMap map = plot->canvasMap( axis );
const double p1 = map.transform( plot->axisScaleDiv( axis ).lowerBound() );
const double p2 = map.transform( plot->axisScaleDiv( axis ).upperBound() );
double d1, d2;
if ( axis == QwtPlot::xBottom || axis == QwtPlot::xTop )
{
d1 = map.invTransform( p1 - dx );
d2 = map.invTransform( p2 - dx );
}
else
{
d1 = map.invTransform( p1 - dy );
d2 = map.invTransform( p2 - dy );
}
plot->setAxisScale( axis, d1, d2 );
}
plot->setAutoReplot( doAutoReplot );
plot->replot();
}
/*!
Calculate a mask from the border path of the canvas
\return Mask as bitmap
\sa QwtPlotCanvas::borderPath()
*/
QBitmap QwtPlotPanner::contentsMask() const
{
if ( canvas() )
return qwtBorderMask( canvas(), size() );
return QwtPanner::contentsMask();
}
/*!
\return Pixmap with the content of the canvas
*/
QPixmap QwtPlotPanner::grab() const
{
const QWidget *cv = canvas();
if ( cv && cv->inherits( "QGLWidget" ) )
{
// we can't grab from a QGLWidget
QPixmap pm( cv->size() );
QwtPainter::fillPixmap( cv, pm );
QPainter painter( &pm );
const_cast<QwtPlot *>( plot() )->drawCanvas( &painter );
return pm;
}
return QwtPanner::grab();
}