Replace the data/Airports/basic.dat.gz and data/Airports/runways.dat.gz with

[flightgear.git] / src / AIModel / AIBase.cxx

diff --git a/src/AIModel/AIBase.cxx b/src/AIModel/AIBase.cxx
index 935d5c660ac9ee3c0d310f70b69e435da6d53b9e..b5459a38f2ffd8245a56ce7b29acb91ab0b5a63e 100644 (file)
--- a/src/AIModel/AIBase.cxx
+++ b/src/AIModel/AIBase.cxx
@@ -78,8 +78,8 @@ FGAIBase::~FGAIBase() {
 }
 
 void FGAIBase::update(double dt) {
-    ft_per_deg_lat = 366468.96 - 3717.12 * cos(pos.lat()/SG_RADIANS_TO_DEGREES);
-    ft_per_deg_lon = 365228.16 * cos(pos.lat() / SG_RADIANS_TO_DEGREES);
+    ft_per_deg_lat = 366468.96 - 3717.12 * cos(pos.lat()*SGD_DEGREES_TO_RADIANS);
+    ft_per_deg_lon = 365228.16 * cos(pos.lat()*SGD_DEGREES_TO_RADIANS);
 
     // Calculate rho at altitude, using standard atmosphere
     // For the temperature T and the pressure p,
@@ -98,9 +98,23 @@ void FGAIBase::update(double dt) {
     }
 
     rho = p / (1718 * (T + 459.7));
+       
+       // calculate the speed of sound at altitude
+       // a = sqrt ( g * R * (T + 459.7))
+       // where:
+       // a = speed of sound [ft/s]
+       // g = specific heat ratio, which is usually equal to 1.4  
+       // R = specific gas constant, which equals 1716 ft-lb/slug/°R 
+       
+       a = sqrt ( 1.4 * 1716 * (T + 459.7));
+       
+       // calculate Mach number
+       
+       Mach = speed/a;
+       
+//     cout  << "Speed(ft/s) "<< speed <<" Altitude(ft) "<< altitude << " Mach " << Mach;
 }
 
-
 void FGAIBase::Transform() {
     if (!invisible) {
       aip.setPosition(pos.lon(), pos.lat(), pos.elev() * SG_METER_TO_FEET);
@@ -122,7 +136,7 @@ bool FGAIBase::init() {
    props = root->getNode(_type_str.c_str(), index, true);
 
    if (model_path != "") {
-      model = sgLoad3DModel( globals->get_fg_root(),
+      model = load3DModel( globals->get_fg_root(),
                             model_path.c_str(),
                              props,
                             globals->get_sim_time_sec() );
@@ -143,6 +157,36 @@ bool FGAIBase::init() {
    return true;
 }
 
+
+ssgBranch * FGAIBase::load3DModel(const string& fg_root, 
+                                 const string &path,
+                                 SGPropertyNode *prop_root, 
+                                 double sim_time_sec)
+{
+  // some more code here to check whether a model with this name has already been loaded
+  // if not load it, otherwise, get the memory pointer and do something like 
+  // SetModel as in ATC/AIEntity.cxx
+  //SSGBranch *model;
+  model = manager->getModel(path);
+  if (!(model))
+    {
+      model = sgLoad3DModel(fg_root,
+                           path,
+                           prop_root,
+                           sim_time_sec);
+      manager->setModel(path, model);
+      model->ref();
+    }
+  //else
+  //  {
+  //    model->ref();
+  //    aip.init(model);
+  //    aip.setVisible(false);
+  //    globals->get_scenery()->get_scene_graph()->addKid(aip.getSceneGraph());
+  // do some setModel stuff.
+  return model;
+}
+
 bool FGAIBase::isa( object_type otype ) {
  if ( otype == _otype ) { return true; }
  else { return false; } 
@@ -189,6 +233,7 @@ void FGAIBase::bind() {
                SGRawValueFunctions<bool>(_isNight));
    props->setBoolValue("controls/lighting/beacon", true);
    props->setBoolValue("controls/lighting/strobe", true);
+   props->setBoolValue("controls/glide-path", true);
 }
 
 void FGAIBase::unbind() {