drop /ai/models/ballistic[]/impact/signal node, and allow instead to define

a report node in the submodels config:

  <impact-reports>/sim/model/cow/impact</impact-reports>

When an impact happens, then the path of the submodel will be written to
this node. An attached listener function can evaluate the impact properties.

src/AIModel/AIBallistic.cxx

@@ -48,6 +48,7 @@ FGAIBallistic::FGAIBallistic() :
     _load_resistance(0),
     _solid(false),
     _impact_data(false),
+    _impact_report_node(0),
     _impact_energy(0),
     _impact_speed(0),
     _impact_lat(0),
@@ -82,6 +83,7 @@ void FGAIBallistic::readFromScenario(SGPropertyNode* scFileNode) {
     setNoRoll(scFileNode->getBoolValue("no-roll", false));
     setRandom(scFileNode->getBoolValue("random", false));
     setImpact(scFileNode->getBoolValue("impact", false));
+    setImpactReportNode(scFileNode->getStringValue("impact-reports"));
     setName(scFileNode->getStringValue("name", "Bomb"));
 }
 
@@ -202,6 +204,13 @@ void FGAIBallistic::setImpact(bool i) {
     _impact = i;
 }
 
+void FGAIBallistic::setImpactReportNode(const string& path) {
+    if (path.empty())
+        _impact_report_node = 0;
+    else
+        _impact_report_node = fgGetNode(path.c_str(), true);
+}
+
 void FGAIBallistic::setName(const string& n) {
     _name = n;
 }
@@ -326,6 +335,8 @@ void FGAIBallistic::handle_impact() {
 
     // report impact by setting tied variables
     if (_ht_agl_ft <= 0) {
+        _impact_data = true;
+
         _impact_lat = pos.getLatitudeDeg();
         _impact_lon = pos.getLongitudeDeg();
         _impact_elev = elevation_m;
@@ -333,8 +344,8 @@ void FGAIBallistic::handle_impact() {
         _impact_energy = (_mass * slugs_to_kgs) * _impact_speed
                 * _impact_speed / (2 * 1000);
 
-        props->setBoolValue("impact/signal", true); // for listeners
+        if (_impact_report_node)
-        _impact_data = true;
+            _impact_report_node->setStringValue(props->getPath());
     }
 }
 

src/AIModel/AIBallistic.hxx

@@ -55,6 +55,7 @@ public:
     void setRandom( bool r );
     void setName(const string&);
     void setImpact(bool i);
+    void setImpactReportNode(const string&);
 
     double _getTime() const;
 
@@ -82,6 +83,7 @@ private:
     bool   _solid;           // if true ground is solid for FDMs
     bool   _impact;          // if true an impact point on the terrain is calculated
     bool   _impact_data;     // if true impact data have been set
+    SGPropertyNode_ptr _impact_report_node;
 
     double _impact_energy;
     double _impact_speed;

src/AIModel/submodel.cxx

@@ -211,6 +211,7 @@ bool FGSubmodelMgr::release(submodel* sm, double dt)
     ballist->setNoRoll(sm->no_roll);
     ballist->setName(sm->name);
     ballist->setImpact(sm->impact);
+    ballist->setImpactReportNode(sm->impact_reports);
     ai->attach(ballist);
 
     if (sm->count > 0)
@@ -489,6 +490,7 @@ void FGSubmodelMgr::setData(int id, string& path, bool serviceable)
         sm->aero_stabilised = entry_node->getBoolValue("aero-stabilised", true);
         sm->no_roll         = entry_node->getBoolValue("no-roll", false);
         sm->impact          = entry_node->getBoolValue("impact", false);
+        sm->impact_reports  = entry_node->getStringValue("impact-reports");
         sm->contents_node   = fgGetNode(entry_node->getStringValue("contents", "none"), false);
         sm->speed_node      = fgGetNode(entry_node->getStringValue("speed-node", "none"), false);
 

src/AIModel/submodel.hxx

@@ -60,6 +60,7 @@ public:
         bool               no_roll;
         bool               serviceable;
         bool               impact;
+        string             impact_reports;
     }
     submodel;