From 2b34388ea671ba65d7e7dafb36f9d20dfec01f5a Mon Sep 17 00:00:00 2001
From: david <david>
Date: Sat, 22 Dec 2001 23:18:28 +0000
Subject: [PATCH] Modified FGSubsystem::update() to take an int parameter for
 delta time (i.e. multiloop).  Most subsystems currently ignore the parameter,
 but eventually, it will allow all subsystems to update by time rather than by
 framerate.

---
 src/Main/viewer.cxx     | 48 +++++++++++++++++++++++++++++++++++++++++
 src/Main/viewer.hxx     |  7 ++++++
 src/Main/viewer_rph.hxx |  2 +-
 3 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/src/Main/viewer.cxx b/src/Main/viewer.cxx
index b723733ff..c13e17806 100644
--- a/src/Main/viewer.cxx
+++ b/src/Main/viewer.cxx
@@ -57,3 +57,51 @@ void FGViewer::update() {
 // Destructor
 FGViewer::~FGViewer( void ) {
 }
+
+void
+FGViewer::init ()
+{
+}
+
+void
+FGViewer::bind ()
+{
+}
+
+void
+FGViewer::unbind ()
+{
+}
+
+void
+FGViewer::update (int dt)
+{
+  for ( int i = 0; i < dt; i++ ) {
+    if ( fabs(get_goal_view_offset() - get_view_offset()) < 0.05 ) {
+      set_view_offset( get_goal_view_offset() );
+      break;
+    } else {
+      // move current_view.view_offset towards
+      // current_view.goal_view_offset
+      if ( get_goal_view_offset() > get_view_offset() )
+	{
+	  if ( get_goal_view_offset() - get_view_offset() < SGD_PI ){
+	    inc_view_offset( 0.01 );
+	  } else {
+	    inc_view_offset( -0.01 );
+	  }
+	} else {
+	  if ( get_view_offset() - get_goal_view_offset() < SGD_PI ){
+	    inc_view_offset( -0.01 );
+	  } else {
+	    inc_view_offset( 0.01 );
+	  }
+	}
+      if ( get_view_offset() > SGD_2PI ) {
+	inc_view_offset( -SGD_2PI );
+      } else if ( get_view_offset() < 0 ) {
+	inc_view_offset( SGD_2PI );
+      }
+    }
+  }
+}
diff --git a/src/Main/viewer.hxx b/src/Main/viewer.hxx
index ccb51e5c0..e5307f3de 100644
--- a/src/Main/viewer.hxx
+++ b/src/Main/viewer.hxx
@@ -34,6 +34,8 @@
 
 #include <plib/sg.h>		// plib include
 
+#include "fgfs.hxx"
+
 
 #define FG_FOV_MIN 0.1
 #define FG_FOV_MAX 179.9
@@ -129,6 +131,11 @@ public:
     // Destructor
     virtual ~FGViewer( void );
 
+    virtual void init ();
+    virtual void bind ();
+    virtual void unbind ();
+    virtual void update (int dt);
+
     //////////////////////////////////////////////////////////////////////
     // setter functions
     //////////////////////////////////////////////////////////////////////
diff --git a/src/Main/viewer_rph.hxx b/src/Main/viewer_rph.hxx
index fc8a580a5..dbd4cbb7a 100644
--- a/src/Main/viewer_rph.hxx
+++ b/src/Main/viewer_rph.hxx
@@ -69,7 +69,7 @@ public:
     ~FGViewerRPH( void );
 
     // Initialize a view class
-    void init( void );
+//      void init( void );
 
     //////////////////////////////////////////////////////////////////////
     // setter functions
-- 
2.39.5