diff --git a/src/wallitem.cpp b/src/wallitem.cpp
new file mode 100644
--- /dev/null
+++ b/src/wallitem.cpp
@@ -0,0 +1,173 @@
+/*
+ *
+ *  This file is part of the Virtual Leaf.
+ *
+ *  The Virtual Leaf is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  The Virtual Leaf is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with the Virtual Leaf.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *  Copyright 2010 Roeland Merks.
+ *
+ */
+
+#include <string>
+#include <QGraphicsScene>
+#include <QVector>
+#include "canvas.h"
+#include "wallitem.h"
+#include "parameter.h"
+#include "node.h"
+#include "transporterdialog.h"
+
+static const std::string _module_id("$Id$");
+
+WallItem::WallItem( Wall *w, int wallnumber, QGraphicsScene *canvas )
+  : QGraphicsLineItem( 0, canvas ), SimItemBase( w, canvas){
+
+  wn = wallnumber;
+
+  extern Parameter par;
+  //Wall *w=&getWall();
+  
+  // Draw amount of "PIN1"
+  //double val = wn==1?(w->Transporters1(1)/par.Pi_tot)*255.:(w->Transporters2(1)/par.Pi_tot)*255.;
+  
+  /* if (val > 255 || val < 0 ) { 
+     std::cerr << "val = " << val << endl;
+     if (wn == 1) {
+     std::cerr << "Transporters1(1) = " << w->Transporters1(1) << endl;
+     } else {
+     std::cerr << "Transporters2(1) = " << w->Transporters2(1) << endl;
+     }
+    
+     }*/
+  
+  
+	  setColor();
+  
+	  // line with "PIN1"is a bit inside the cell wall
+	  Vector edgevec = (*(w->N2())) - (*(w->N1()));
+	  Vector perp = edgevec.Normalised().Perp2D();
+	  
+	  Vector offs = Cell::Offset();
+	  double factor = Cell::Factor();
+	  
+	  Vector from = ( offs + *(w->N1()) ) * factor + (wn==1?-1:1) * par.outlinewidth * 0.5 * factor * perp;
+	  Vector to = ( offs + *(w->N2()) ) *factor + (wn==1?-1:1) * par.outlinewidth * 0.5 * factor * perp;
+	  
+	  
+	  Vector tmp_centroid = ( *(w->N2()) + *(w->N1()) )/2.;
+	  Vector centroid = ( offs + tmp_centroid ) * factor;
+	  
+	  QString text=QString("%1").arg(w->Index());
+
+	  /*  if (0) {
+		  QGraphicsSimpleTextItem *ctext = new QGraphicsSimpleTextItem ( text, 0, canvas );
+		  ctext->setPen( QPen(QColor("orange")) );
+		  ctext->setZValue(20);
+		  ctext->setFont( QFont( "Helvetica", par.nodenumsize, QFont::Bold) );
+		  //ctext->setTextFlags(Qt::AlignCenter);
+		  ctext->show();
+		  ctext ->setPos(centroid.x,
+						 centroid.y );
+	  }*/
+	  
+	  setLine(( from.x ),
+			  ( from.y ),
+			  ( to.x ),
+			  ( to.y ) );
+	  setZValue(12);
+  }
+
+
+void WallItem::setColor(void) {
+
+  QColor diffcolor;
+  static const QColor purple("Purple");
+  static const QColor blue("blue");
+  
+  Wall *w=&getWall();
+  double tr = wn==1?w->Transporters1(1):w->Transporters2(1);
+  CellBase *c = wn==1?w->C1():w->C2();
+  diffcolor.setRgb( (int)( ( tr / (1 + tr) )*255.), 0, 0);
+  //diffcolor.setRgb( (int)( ((wn==1?w->Transporters1(1):w->Transporters2(1)))*255.), 0, 0);
+  /* if (wn==1) {
+     cerr << "Transporter: " << w->Transporters1(1) << endl;
+     } else {
+     cerr << "Transporter: " << w->Transporters2(1) << endl;
+     }*/
+  
+  if (w->AuxinSource() && c->BoundaryPolP()) {
+    setPen( QPen(purple , par.outlinewidth) );
+  } else {
+    if (w->AuxinSink() && c->BoundaryPolP()) {
+      setPen( QPen(blue, par.outlinewidth));
+    } else {
+      setPen (QPen(diffcolor, par.outlinewidth) );
+    }
+  }
+  
+//   if (c->BoundaryPolP()) {
+//     setPen(QPen(QColor("red"), 20));
+//   }
+}
+
+void WallItem::OnClick(QMouseEvent *e) {
+  
+
+	Wall *w=&getWall();
+	cerr << "Wall ID = " << w->Index() << ", this = " << w << "\n";
+	cerr << "Wall item = " << this << "\n";
+	cerr << "C1 = " << w->C1()->Index() << ", C2 = " << w->C2()->Index() << endl;
+	cerr << "N1 = " << w->N1()->Index() << ", N2 = " << w->N2()->Index() << endl;
+	//double tr = wn==1?w->Transporters1(1):w->Transporters2(1);
+	CellBase *c = wn==1?w->C1():w->C2();
+
+	TransporterDialog dialog(w, c, wn);
+	dialog.exec();
+
+	if (e->button() == Qt::RightButton) {
+		QString message;
+		if (wn==1) {
+			message=QString("Transporter 1 = %1, color = %2, length = %3\n").arg(w->Transporters1(1)).arg(pen().color().red()).arg(getWall().Length());
+		} else {
+			message=QString("Transporter 2 = %1, color = %2, length = %3\n").arg(w->Transporters2(1)).arg(pen().color().red()).arg(getWall().Length());
+		}
+		
+		//extern MainBase *main_window;
+		//((Main *)main_window)->UserMessage(message);
+		
+	} else {
+		if (e->button() == Qt::LeftButton) {
+			if (c->BoundaryPolP()) {
+				w->cycleWallType();
+			} else {
+				if (e->modifiers() == Qt::ShiftModifier) {
+					wn==1?w->setTransporters1(1,0):w->setTransporters2(1,0);					
+					
+				} else {
+					// set high amount of PIN1
+					//cerr << "Setting PIN1\n";
+					wn==1?w->setTransporters1(1,10):w->setTransporters2(1,10);
+				}
+			}
+			setColor();
+			update(boundingRect());
+		} 
+		/* else {
+			if (e->button() == Qt::MidButton && (e->modifiers == Qt::ShiftModifier & Qt::ControlModifier)) {
+				// hidden feature for correcting 
+			}*/
+		
+	
+	}
+}