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// code borrowed from event_filter qwt examples
// and modified for GC LTM purposes
#include <qapplication.h>
#include <qevent.h>
#include <qwhatsthis.h>
#include <qpainter.h>
#include <qwt_plot.h>
#include <qwt_symbol.h>
#include <qwt_scale_map.h>
#include <qwt_plot_canvas.h>
#include <qwt_plot_curve.h>
#include "LTMCanvasPicker.h"
#include <QDebug>
LTMCanvasPicker::LTMCanvasPicker(QwtPlot *plot):
QObject(plot),
d_selectedCurve(NULL),
d_selectedPoint(-1)
{
QwtPlotCanvas *canvas = plot->canvas();
canvas->installEventFilter(this);
// We want the focus, but no focus rect. The
canvas->setFocusPolicy(Qt::StrongFocus);
canvas->setFocusIndicator(QwtPlotCanvas::ItemFocusIndicator);
}
bool LTMCanvasPicker::event(QEvent *e)
{
if ( e->type() == QEvent::User )
{
//showCursor(true);
return true;
}
return QObject::event(e);
}
bool LTMCanvasPicker::eventFilter(QObject *object, QEvent *e)
{
if ( object != (QObject *)plot()->canvas() )
return false;
switch(e->type())
{
default:
QApplication::postEvent(this, new QEvent(QEvent::User));
break;
case QEvent::MouseButtonPress:
select(((QMouseEvent *)e)->pos(), true);
break;
case QEvent::MouseMove:
select(((QMouseEvent *)e)->pos(), false);
break;
}
return QObject::eventFilter(object, e);
}
// Select the point at a position. If there is no point
// deselect the selected point
void LTMCanvasPicker::select(const QPoint &pos, bool clicked)
{
QwtPlotCurve *curve = NULL;
double dist = 10e10;
int index = -1;
const QwtPlotItemList& itmList = plot()->itemList();
for ( QwtPlotItemIterator it = itmList.begin();
it != itmList.end(); ++it )
{
if ( (*it)->rtti() == QwtPlotItem::Rtti_PlotCurve )
{
QwtPlotCurve *c = (QwtPlotCurve*)(*it);
double d = -1;
int idx = c->closestPoint(pos, &d);
if ( d != -1 && d < dist )
{
curve = c;
index = idx;
dist = d;
}
}
}
d_selectedCurve = NULL;
d_selectedPoint = -1;
if ( curve && dist < 10 ) // 10 pixels tolerance
{
// picked one
d_selectedCurve = curve;
d_selectedPoint = index;
if (clicked)
pointClicked(curve, index); // emit
else
pointHover(curve, index); // emit
} else {
// didn't
if (clicked)
pointClicked(NULL, -1); // emit
else
pointHover(NULL, -1); // emit
}
}
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