X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FMain%2Fviewer.hxx;h=107401a373fa572b73e82251c09718a63caaa104;hb=e2dd3ac3e5682a47200f668343f91a617382f3fb;hp=087b59c75dd23b5d528178b4e0aadba3b5cd2e5b;hpb=f24b6a4098c79a1c47d6dfba97e959fb0e7c6d38;p=flightgear.git

diff --git a/src/Main/viewer.hxx b/src/Main/viewer.hxx
index 087b59c75..107401a37 100644
--- a/src/Main/viewer.hxx
+++ b/src/Main/viewer.hxx
@@ -35,6 +35,10 @@
 #include <plib/sg.h>		// plib include
 
 
+#define FG_FOV_MIN 0.1
+#define FG_FOV_MAX 179.9
+
+
 // Define a structure containing view information
 class FGViewer {
 
@@ -55,9 +59,16 @@ protected:
 
     fgViewType _type;
 
+    // the field of view in the x (width) direction
+    double fov; 
+
+    // ratio of x and y fov's; fov(y) = fov(x) * win_ratio
+    double win_ratio;
+
     // the current view offset angle from forward (rotated about the
     // view_up vector)
     double view_offset;
+    bool reverse_view_offset;
 
     // the goal view offset angle  (used for smooth view changes)
     double goal_view_offset;
@@ -79,6 +90,9 @@ protected:
     // translated to scenery.center
     sgVec3 zero_elev;
 
+    // height ASL of the terrain for our current view position
+    // (future?) double ground_elev;
+
     // pilot offset from center of gravity.  The X axis is positive
     // out the tail, Y is out the right wing, and Z is positive up.
     // Distances in meters of course.
@@ -102,7 +116,7 @@ protected:
     inline void set_clean() { dirty = false; }
 
     // Update the view volume, position, and orientation
-    virtual void update();
+    virtual void update() = 0;
 
 public:
 
@@ -115,6 +129,8 @@ public:
     //////////////////////////////////////////////////////////////////////
     // setter functions
     //////////////////////////////////////////////////////////////////////
+    inline void set_fov( double amount ) { fov = amount; }
+    inline void set_win_ratio( double r ) { win_ratio = r; }
     inline void set_view_offset( double a ) {
 	set_dirty();
 	view_offset = a;
@@ -126,6 +142,15 @@ public:
     inline void set_goal_view_offset( double a) {
 	set_dirty();
 	goal_view_offset = a;
+	while ( goal_view_offset < 0 ) {
+	    goal_view_offset += 360.0;
+	}
+	while ( goal_view_offset > 360.0 ) {
+	    goal_view_offset -= 360.0;
+	}
+    }
+    inline void set_reverse_view_offset( bool val ) {
+	reverse_view_offset = val;
     }
     inline void set_geod_view_pos( double lon, double lat, double alt ) {
 	// data should be in radians and meters asl
@@ -150,7 +175,10 @@ public:
     inline int get_type() const { return _type ; }
     inline int is_a( int t ) const { return get_type() == t ; }
     inline bool is_dirty() const { return dirty; }
+    inline double get_fov() const { return fov; }
+    inline double get_win_ratio() const { return win_ratio; }
     inline double get_view_offset() const { return view_offset; }
+    inline bool get_reverse_view_offset() const { return reverse_view_offset; }
     inline double get_goal_view_offset() const { return goal_view_offset; }
     inline double *get_geod_view_pos() { return geod_view_pos; }
     inline float *get_pilot_offset() { return pilot_offset; }
@@ -171,6 +199,11 @@ public:
 	if ( dirty ) { update(); }
 	return zero_elev;
     }
+    // (future?)
+    // inline double get_ground_elev() {
+    //  if ( dirty ) { update(); }
+    //	return ground_elev;
+    // }
     inline float *get_surface_south() {
 	if ( dirty ) { update(); }
 	return surface_south;