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#include <qevent.h>
#include <qwt_plot.h>
#include <qwt_scale.h>
#include "scalepicker.h"
ScalePicker::ScalePicker(QwtPlot *plot):
QObject(plot)
{
for ( uint i = 0; i < QwtPlot::axisCnt; i++ )
{
QwtScale *scale = (QwtScale *)plot->axis(i);
if ( scale )
scale->installEventFilter(this);
}
}
bool ScalePicker::eventFilter(QObject *object, QEvent *e)
{
if ( object->inherits("QwtScale") &&
e->type() == QEvent::MouseButtonPress )
{
mouseClicked((const QwtScale *)object,
((QMouseEvent *)e)->pos());
return TRUE;
}
return QObject::eventFilter(object, e);
}
void ScalePicker::mouseClicked(const QwtScale *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->position())
{
case QwtScale::Left:
{
value = sd->invTransform(pos.y());
axis = QwtPlot::yLeft;
break;
}
case QwtScale::Right:
{
value = sd->invTransform(pos.y());
axis = QwtPlot::yRight;
break;
}
case QwtScale::Bottom:
{
value = sd->invTransform(pos.x());
axis = QwtPlot::xBottom;
break;
}
case QwtScale::Top:
{
value = sd->invTransform(pos.x());
axis = QwtPlot::xTop;
break;
}
}
emit clicked(axis, value);
}
}
// The rect of a scale without the title
QRect ScalePicker::scaleRect(const QwtScale *scale) const
{
const int bld = scale->baseLineDist();
const int mjt = scale->scaleDraw()->majTickLength();
const int sbd = scale->startBorderDist();
const int ebd = scale->endBorderDist();
QRect rect;
switch(scale->position())
{
case QwtScale::Left:
{
rect.setRect(scale->width() - bld - mjt, sbd,
mjt, scale->height() - sbd - ebd);
break;
}
case QwtScale::Right:
{
rect.setRect(bld, sbd,
mjt, scale->height() - sbd - ebd);
break;
}
case QwtScale::Bottom:
{
rect.setRect(sbd, bld,
scale->width() - sbd - ebd, mjt);
break;
}
case QwtScale::Top:
{
rect.setRect(sbd, scale->height() - bld - mjt,
scale->width() - sbd - ebd, mjt);
break;
}
}
return rect;
}
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