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#include "scalepicker.h"
#include <qwt_plot.h>
#include <qwt_scale_widget.h>
#include <qevent.h>
#include <qmath.h>
ScalePicker::ScalePicker( QwtPlot *plot ):
QObject( plot )
{
for ( uint i = 0; i < QwtPlot::axisCnt; i++ )
{
QwtScaleWidget *scaleWidget = plot->axisWidget( i );
if ( scaleWidget )
scaleWidget->installEventFilter( this );
}
}
bool ScalePicker::eventFilter( QObject *object, QEvent *event )
{
if ( event->type() == QEvent::MouseButtonPress )
{
QwtScaleWidget *scaleWidget = qobject_cast<QwtScaleWidget *>( object );
if ( scaleWidget )
{
QMouseEvent *mouseEvent = static_cast<QMouseEvent *>( event );
mouseClicked( scaleWidget, mouseEvent->pos() );
return true;
}
}
return QObject::eventFilter( object, event );
}
void ScalePicker::mouseClicked( const QwtScaleWidget *scale, const QPoint &pos )
{
QRect rect = scaleRect( scale );
int margin = 10; // 10 pixels tolerance
rect.setRect( rect.x() - margin, rect.y() - margin,
rect.width() + 2 * margin, rect.height() + 2 * margin );
if ( rect.contains( pos ) ) // No click on the title
{
// translate the position in a value on the scale
double value = 0.0;
int axis = -1;
const QwtScaleDraw *sd = scale->scaleDraw();
switch( scale->alignment() )
{
case QwtScaleDraw::LeftScale:
{
value = sd->scaleMap().invTransform( pos.y() );
axis = QwtPlot::yLeft;
break;
}
case QwtScaleDraw::RightScale:
{
value = sd->scaleMap().invTransform( pos.y() );
axis = QwtPlot::yRight;
break;
}
case QwtScaleDraw::BottomScale:
{
value = sd->scaleMap().invTransform( pos.x() );
axis = QwtPlot::xBottom;
break;
}
case QwtScaleDraw::TopScale:
{
value = sd->scaleMap().invTransform( pos.x() );
axis = QwtPlot::xTop;
break;
}
}
Q_EMIT clicked( axis, value );
}
}
// The rect of a scale without the title
QRect ScalePicker::scaleRect( const QwtScaleWidget *scale ) const
{
const int bld = scale->margin();
const int mjt = qCeil( scale->scaleDraw()->maxTickLength() );
const int sbd = scale->startBorderDist();
const int ebd = scale->endBorderDist();
QRect rect;
switch( scale->alignment() )
{
case QwtScaleDraw::LeftScale:
{
rect.setRect( scale->width() - bld - mjt, sbd,
mjt, scale->height() - sbd - ebd );
break;
}
case QwtScaleDraw::RightScale:
{
rect.setRect( bld, sbd,
mjt, scale->height() - sbd - ebd );
break;
}
case QwtScaleDraw::BottomScale:
{
rect.setRect( sbd, bld,
scale->width() - sbd - ebd, mjt );
break;
}
case QwtScaleDraw::TopScale:
{
rect.setRect( sbd, scale->height() - bld - mjt,
scale->width() - sbd - ebd, mjt );
break;
}
}
return rect;
}
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