void SHistogram::updating()
{
this->stopping();
::fwData::Histogram::csptr histogram = this->getInput< ::fwData::Histogram>(s_HISTOGRAM_INPUT);
::fwData::Histogram::fwHistogramValues values = histogram->getValues();
m_layer = new QGraphicsItemGroup();
if (!values.empty())
{
// Update color with opacity
QColor color = m_color.color();
color.setAlphaF( m_opacity );
m_color.setColor( color );
const float min = histogram->getMinValue();
const float binsWidth = histogram->getBinsWidth();
// Initialize the path with a start point:
// The value preceding the current value that we'll use to build the arcs of the path
Point2DType startPoint = this->mapAdaptorToScene(Point2DType(min, values[0]), m_xAxis, m_yAxis);
Point2DType pair;
QBrush brush = QBrush(m_color.color());
// Build the graphic items:
const int nbValues = (int)values.size();
for(int i = 1; i < nbValues; ++i)
{
pair = this->mapAdaptorToScene(Point2DType(min + i * binsWidth, values[i]), m_xAxis, m_yAxis);
QPainterPath painter( QPointF(startPoint.first, 0) );
painter.lineTo( startPoint.first, startPoint.second );
painter.lineTo( pair.first, pair.second );
painter.lineTo( pair.first, 0 );
QGraphicsPathItem* item = new QGraphicsPathItem( painter );
item->setPath( painter );
item->setBrush( brush );
item->setPen( Qt::NoPen );
item->setCacheMode( QGraphicsItem::DeviceCoordinateCache );
m_layer->addToGroup( item );
startPoint = pair;
}
// Adjust the layer's position and zValue depending on the associated axis
m_layer->setPos(m_xAxis->getOrigin(), m_yAxis->getOrigin());
m_layer->setZValue(m_zValue);
// Add to the scene the unique item which gather the whole set of rectangle graphic items:
this->getScene2DRender()->getScene()->addItem( m_layer );
}
}
IAdaptor::Point2DType IAdaptor::mapSceneToAdaptor(Point2DType _xy, ::scene2D::data::Axis::sptr _xAxis, ::scene2D::data::Axis::sptr _yAxis )
{
// Do the reverse operation of the mapAdaptorToScene function
double x, y;
if (_xAxis->getScaleType() == "LOG")
{
x = 10 * exp( _xy.first ) / _xAxis->getScale();
}
else
{
x = ( _xy.first ) / _xAxis->getScale();
}
if (_yAxis->getScaleType() == "LOG")
{
y = 10 * ( _xy.second ) / _yAxis->getScale();
}
else
{
y = _xy.second / _yAxis->getScale();
}
return Point2DType( x , y );
}