#include <cpBaseQtApplication/Connection.h>
#include <cpBaseQtApplication/Port.h>

#include <QBrush>
#include <QGraphicsScene>
#include <QPainter>
#include <QPen>

// -------------------------------------------------------------------------
cpBaseQtApplication::Connection::
Connection( QGraphicsItem* parent, QGraphicsScene* scene )
  : Superclass( parent, scene )
{
  this->setPen( QPen( Qt::black, 2 ) );
  this->setBrush( Qt::NoBrush );
  this->setZValue( -1 );
  this->m_Port1 = NULL;
  this->m_Port2 = NULL;
  this->setFlag( QGraphicsItem::ItemIsSelectable );
}

// -------------------------------------------------------------------------
cpBaseQtApplication::Connection::
~Connection( )
{
  if( this->m_Port1 != NULL )
    this->m_Port1->connections( ).
      remove( this->m_Port1->connections( ).indexOf( this ) );

  if( this->m_Port2 != NULL )
    this->m_Port2->setConnection( NULL );
}

// -------------------------------------------------------------------------
void cpBaseQtApplication::Connection::
setPos1( const QPointF& p )
{
  this->m_Pos1 = p;
}

// -------------------------------------------------------------------------
void cpBaseQtApplication::Connection::
setPos2( const QPointF& p )
{
  this->m_Pos2 = p;
}

// -------------------------------------------------------------------------
void cpBaseQtApplication::Connection::
setPort1( OutputPort* p )
{
  if( p != NULL )
  {
    p->connections( ).append( this );
    this->m_Port1 = p;

  } // fi
}

// -------------------------------------------------------------------------
void cpBaseQtApplication::Connection::
setPort2( InputPort* p )
{
  if( p != NULL )
  {
    if( p->connection( ) == NULL )
    {
      p->setConnection( this );
      this->m_Port2 = p;

    } // fi

  } // fi
}

// -------------------------------------------------------------------------
void cpBaseQtApplication::Connection::
updatePosFromPorts( )
{
  if( this->m_Port1 != NULL )
    this->m_Pos1 =
      this->m_Port1->scenePos( ) +
      QPointF( this->m_Port1->radius( ), this->m_Port1->radius( ) );
  if( this->m_Port2 != NULL )
    this->m_Pos2 =
      this->m_Port2->scenePos( ) +
      QPointF( this->m_Port2->radius( ), this->m_Port2->radius( ) );
}

// -------------------------------------------------------------------------
void cpBaseQtApplication::Connection::
updatePath( )
{
  QPainterPath p;
  p.moveTo( this->m_Pos1 );

  qreal dx = this->m_Pos2.x( ) - this->m_Pos1.x( );
  qreal dy = this->m_Pos2.y( ) - this->m_Pos1.y( );
  QPointF c1( this->m_Pos1.x( ) + dx * 0.25, this->m_Pos1.y( ) + dy * 0.1 );
  QPointF c2( this->m_Pos1.x( ) + dx * 0.75, this->m_Pos1.y( ) + dy * 0.9 );
  p.cubicTo( c1, c2, this->m_Pos2 );

  this->setPath( p );
}

// -------------------------------------------------------------------------
cpBaseQtApplication::OutputPort* cpBaseQtApplication::Connection::
port1( ) const
{
  return( this->m_Port1 );
}

// -------------------------------------------------------------------------
cpBaseQtApplication::InputPort* cpBaseQtApplication::Connection::
port2( ) const
{
  return( this->m_Port2 );
}

// -------------------------------------------------------------------------
void cpBaseQtApplication::Connection::
paint(
  QPainter* painter,
  const QStyleOptionGraphicsItem* option,
  QWidget* widget
  )
{
  Q_UNUSED( option );
  Q_UNUSED( widget );

  if( this->isSelected( ) )
    painter->setPen( QPen( Qt::red, 5 ) );
  else
    painter->setPen( QPen( Qt::black, 2 ) );
  this->setBrush( Qt::NoBrush );
  painter->drawPath( this->path( ) );
}

// eof - $RCSfile$