#248: support enabling AI module at run-time

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

diff --git a/src/AIModel/performancedata.cxx b/src/AIModel/performancedata.cxx
index f07ad6132d2724fd7a86e4a343c6a1d7976327b8..f8da70de615ac9c2566fa46b1bfeb0b84c2aead6 100644 (file)
--- a/src/AIModel/performancedata.cxx
+++ b/src/AIModel/performancedata.cxx
@@ -6,6 +6,13 @@
 #include "performancedata.hxx"
 #include "AIAircraft.hxx"
 
+
+// For now, make this a define
+// Later on, additional class variables can simulate settings such as braking power
+// also, the performance parameters can be tweaked a little to add some personality
+// to the AIAircraft.
+#define BRAKE_SETTING 1.6
+
 PerformanceData::PerformanceData(double acceleration,
                                 double deceleration,
                                 double climbRate,
@@ -42,7 +49,7 @@ PerformanceData::PerformanceData( const std::string& filename)
 PerformanceData::~PerformanceData()
 {}
 
-double PerformanceData::actualSpeed(FGAIAircraft* ac, double tgt_speed, double dt) {
+double PerformanceData::actualSpeed(FGAIAircraft* ac, double tgt_speed, double dt, bool maxBrakes) {
     // if (tgt_speed > _vTaxi & ac->onGround()) // maximum taxi speed on ground
     //    tgt_speed = _vTaxi;
     // bad idea for a take off roll :-)
@@ -59,7 +66,13 @@ double PerformanceData::actualSpeed(FGAIAircraft* ac, double tgt_speed, double d
     } else if (speed_diff < 0.0) { // decelerate
         if (ac->onGround()) {
             // deceleration performance is better due to wheel brakes.
-            speed -= 3 * _deceleration * dt;
+            double brakePower = 0;
+            if (maxBrakes) {
+                brakePower = 3;
+            } else {
+                brakePower = BRAKE_SETTING;
+            }
+            speed -= brakePower * _deceleration * dt;
         } else {
             speed -= _deceleration * dt;
         }
@@ -120,7 +133,8 @@ double PerformanceData::actualPitch(FGAIAircraft* ac, double tgt_pitch, double d
 
 double PerformanceData::actualAltitude(FGAIAircraft* ac, double tgt_altitude, double dt) {
     if (ac->onGround()) {
-        //FIXME: return a value here
+        //FIXME: a return sensible value here
+        return 0.0; // 0 for now to avoid compiler errors
     } else
         return ac->getAltitude() + ac->getVerticalSpeed()*dt/60.0;
 }
@@ -129,7 +143,7 @@ double PerformanceData::actualVerticalSpeed(FGAIAircraft* ac, double tgt_vs, dou
     double vs = ac->getVerticalSpeed();
     double vs_diff = tgt_vs - vs;
 
-    if (fabs(vs_diff) > 10.0) {
+    if (fabs(vs_diff) > .001) {
         if (vs_diff > 0.0) {
             vs += _climbRate * dt / 3.0; //TODO avoid hardcoded 3 secs to attain climb rate from level flight