diff --git a/wrap/gui/trackball.cpp b/wrap/gui/trackball.cpp
index 59d9fe5b..52340f7b 100644
--- a/wrap/gui/trackball.cpp
+++ b/wrap/gui/trackball.cpp
@@ -24,6 +24,9 @@
   History
 
 $Log: not supported by cvs2svn $
+Revision 1.8  2004/06/09 14:01:13  cignoni
+Heavily restructured. To be completed only rotation works...
+
 Revision 1.7  2004/05/14 03:15:09  ponchio
 Redesigned partial version.
 
@@ -128,7 +131,7 @@ void Trackball::ApplyInverse() {
 /***************************************************************/
 
 void Trackball::DrawCircle() {
-  const int nside=18;
+  int nside=DH.CircleStep;
   const double pi2=3.14159265*2.0;
   glBegin(GL_LINE_STRIP);
   for(double i=0;i<=nside;i++){
@@ -178,8 +181,8 @@ void Trackball::Draw() {
   glPushMatrix();
   ApplyInverse();
   glBegin(GL_POINTS);
-    for(int i=0;i<Hits.size();++i)
-    glVertex(Hits[i]);
+  for(vector<Point3f>::iterator vi=Hits.begin();vi!=Hits.end();++vi)
+    glVertex(*vi);
   glEnd();
   glPopMatrix();
 
@@ -187,12 +190,14 @@ void Trackball::Draw() {
   
   glTranslate(center);
   glScalef(radius,radius,radius);
+  glScalef(1.0f/track.sca,1.0f/track.sca,1.0f/track.sca);
+
 
   /// Here start the real drawing stuff
   
   float amb[4] ={.3f,.3f,.3f,1.0f};
   float col[4] ={.5f,.5f,.8f,1.0f};
-  float col2[4]={.9f,.9f,1.0f,1.0f};
+  //float col2[4]={.9f,.9f,1.0f,1.0f};
   glPushAttrib(GL_ENABLE_BIT | GL_LINE_BIT | GL_CURRENT_BIT | GL_LIGHTING_BIT);
   glLineWidth(2.0);
   glEnable(GL_LIGHTING);
@@ -287,8 +292,14 @@ void Trackball::MouseUp(int /* x */, int /* y */, int button) {
   current_button &= (~button);
   SetCurrentAction();
 } 
-
-void Trackball::MouseWheel(Trackball::Button /* notch */ ) {
+ // it assumes that a notch of 1.0 is a single step of the wheel
+void Trackball::MouseWheel(float notch  ) {
+  if(current_mode == NULL)
+  {
+    SphereMode tm;
+    tm.TrackMode::Apply(this, notch);
+  }
+  current_mode->Apply(this, notch);
 }
 
 void Trackball::ButtonDown(Trackball::Button button) {
diff --git a/wrap/gui/trackball.h b/wrap/gui/trackball.h
index e70b4791..80f1733f 100644
--- a/wrap/gui/trackball.h
+++ b/wrap/gui/trackball.h
@@ -25,6 +25,9 @@
   History
 
 $Log: not supported by cvs2svn $
+Revision 1.7  2004/06/09 14:01:13  cignoni
+Heavily restructured. To be completed only rotation works...
+
 Revision 1.6  2004/05/14 03:15:09  ponchio
 Redesigned partial version.
 
@@ -73,9 +76,20 @@ namespace vcg {
   Transform interpolate(const Transform &a, const Transform &b, float t);
 
   class TrackMode;
-
-  class Trackball: public Transform {
+   class Trackball: public Transform {
   public:
+ class DrawingHint
+    {
+    public:
+      DrawingHint() {  CircleStep=32;   }
+
+      int CircleStep;
+    };
+
+
+ DrawingHint DH;
+
+  
     enum Button { BUTTON_NONE   = 0x0000, 
 		  BUTTON_LEFT   = 0x0001, 
 		  BUTTON_MIDDLE = 0x0002, 
@@ -94,7 +108,7 @@ namespace vcg {
     void SetTransform(const Transform &transform, int miilisec = 0);
 
     //operating
-    void GetView();
+    void GetView();\
     void Apply();
     void ApplyInverse();
     void Draw();
@@ -102,15 +116,15 @@ namespace vcg {
     void Reset();
 
     // Internal Drawing stuff
-    static void DrawCircle ();
-    static void DrawPlane();
-    static void DrawPlaneHandle();
+    void DrawCircle ();
+    void DrawPlane();
+    void DrawPlaneHandle();
 
     //interface
     void MouseDown(int x, int y, /*Button*/ int button);
     void MouseMove(int x, int y); 
     void MouseUp(int x, int y, /*Button */ int button); 
-    void MouseWheel(Button notch);
+    void MouseWheel(float notch);  // it assumes that a notch of 1.0 is a single step of the wheel
     void ButtonUp(Button button);
     void ButtonDown(Button button);
 
@@ -154,7 +168,7 @@ namespace vcg {
   
     int current_button;
     TrackMode *current_mode;
-
+   
     std::map<int, TrackMode *> modes;
 
     Similarityf last_track;
diff --git a/wrap/gui/trackmode.cpp b/wrap/gui/trackmode.cpp
index 6f5b15a2..0da7359a 100644
--- a/wrap/gui/trackmode.cpp
+++ b/wrap/gui/trackmode.cpp
@@ -24,6 +24,9 @@
   History
 
 $Log: not supported by cvs2svn $
+Revision 1.6  2004/06/09 14:01:13  cignoni
+Heavily restructured. To be completed only rotation works...
+
 Revision 1.5  2004/05/14 03:15:09  ponchio
 Redesigned partial version.
 
@@ -48,6 +51,12 @@ Adding copyright.
 using namespace std;
 
 using namespace vcg;
+
+
+void TrackMode::Apply(Trackball *trackball, float WheelNotch) {
+    trackball->track.sca*=pow(1.2f,WheelNotch);
+ };
+
 /// Compute the plane plane perpedicular to view dir and passing through manip center
 Plane3f TrackMode::GetViewPlane(const View<float> &camera, const Point3f &center) {
   Point3f vp = camera.ViewPoint();
@@ -143,8 +152,8 @@ bool SphereMode::HitHyper(Point3f center,  float radius, Point3f viewpoint, Plan
   float x1,x2,xval,yval;
   if(delta>0)
   {
-    x1= (- b - sqrt(delta))/(2.0*a);
-    x2= (- b + sqrt(delta))/(2.0*a);
+    x1= (- b - sqrt(delta))/(2.0f*a);
+    x2= (- b + sqrt(delta))/(2.0f*a);
     
     xval=x1; // always take the minimum value solution
     yval=c/xval;     //  alternatively it also oould be the other part of the equation yval=-(hitplaney/viewpointx)*xval+hitplaney;
diff --git a/wrap/gui/trackmode.h b/wrap/gui/trackmode.h
index 8fa50812..53b55216 100644
--- a/wrap/gui/trackmode.h
+++ b/wrap/gui/trackmode.h
@@ -24,6 +24,9 @@
   History
 
 $Log: not supported by cvs2svn $
+Revision 1.6  2004/06/09 14:01:13  cignoni
+Heavily restructured. To be completed only rotation works...
+
 Revision 1.5  2004/05/14 03:15:09  ponchio
 Redesigned partial version.
 
@@ -54,6 +57,8 @@ class TrackMode {
 public:
   virtual ~TrackMode() {}
   virtual void Apply(Trackball *trackball, Point3f new_point) = 0;
+  virtual void Apply(Trackball *trackball, float WheelNotch);
+
   virtual void Draw() {}
  protected:
   Plane3f GetViewPlane(const View<float> &view, const Point3f &center);