From 632f4842f13092e2aa5ce196867fab4bac6b920d Mon Sep 17 00:00:00 2001
From: ponchio <federico.ponchio@isti.cnr.it>
Date: Tue, 28 Oct 2008 16:43:56 +0000
Subject: [PATCH] Polar mode now working.

---
 wrap/gui/trackmode.cpp | 25 ++++++++++++++++++++-----
 wrap/gui/trackmode.h   |  8 +++++++-
 2 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/wrap/gui/trackmode.cpp b/wrap/gui/trackmode.cpp
index 7a9aa3f7..b6954092 100644
--- a/wrap/gui/trackmode.cpp
+++ b/wrap/gui/trackmode.cpp
@@ -781,15 +781,30 @@ void PolarMode::Apply (Trackball * tb, Point3f new_point)
   float dx = (hitNew.X() - hitOld.X());
   float dy = (hitNew.Y() - hitOld.Y());
 
-  const float PI2=6.283185307179586232f;
+  const float scale = 0.5*M_PI; //sensitivity of the mouse
+  const float top = 0.9*M_PI/2; //maximum top view angle
 
-  float anglex =  dx/(tb->radius * PI2);
-  float angley = -dy/(tb->radius * PI2);
-
-  tb->track.rot = Quaternionf (anglex,Point3f(0,1,0)) * Quaternionf (angley,Point3f(1,0,0)) * tb->last_track.rot ;
+  float anglex =  dx/(tb->radius * scale);
+  float angley = -dy/(tb->radius * scale);
+  enda = alpha + anglex;
+  endb = beta + angley;
+  if(endb > top) endb = top;
+  if(endb < -top) endb = -top;
+  tb->track.rot = Quaternionf (endb, Point3f(1,0,0)) * 
+                  Quaternionf (enda, Point3f(0,1,0)) ;
 
 }
 
+void PolarMode::SetAction() {
+  alpha = enda;
+  beta = endb;
+}
+
+void PolarMode::Reset() {
+  alpha = beta = enda = endb = 0;
+}
+
+
 void PolarMode::Draw(Trackball * tb){
   DrawSphereIcon(tb,true );
 }
diff --git a/wrap/gui/trackmode.h b/wrap/gui/trackmode.h
index e5e02ca3..994d5a39 100644
--- a/wrap/gui/trackmode.h
+++ b/wrap/gui/trackmode.h
@@ -1016,16 +1016,22 @@ private:
 };
 
 // Polar mode.
+/* WARNING this mode is not compatible with the other rotation modes */
 
 class PolarMode:public TrackMode {
 public:
+  PolarMode(): alpha(0), beta(0), enda(0), endb(0) {}
    void Apply (Trackball * trackball, Point3f new_point);
 
   const char *Name () {
     return "PolarMode";
   };
-
+  void SetAction();
+  void Reset(); 
  void Draw (Trackball * trackball);
+private:
+ double alpha, beta; //rotation in y and x axis
+ double enda, endb;  //store intermediate values of alpha and beta
 };