Ref T185 Enable spline interpolation with only one position update,

by just copying it three times, so planes can be rendered without waiting for more updates.

src/blackmisc/aviation/aircraftpartslist.cpp

@@ -22,5 +22,9 @@ namespace BlackMisc
             CSequence<CAircraftParts>(other)
         { }
 
+        CAircraftPartsList::CAircraftPartsList(std::initializer_list<CAircraftParts> il) :
+            CSequence<CAircraftParts>(il)
+        { }
+
     } // namespace
 } // namespace

src/blackmisc/aviation/aircraftpartslist.h

@@ -39,6 +39,9 @@ namespace BlackMisc
 
             //! Construct from a base class object.
             CAircraftPartsList(const CSequence<CAircraftParts> &other);
+
+            //! Construct from initializer list.
+            CAircraftPartsList(std::initializer_list<CAircraftParts> il);
         };
 
     } //namespace

src/blackmisc/aviation/aircraftsituationlist.cpp

@@ -27,5 +27,9 @@ namespace BlackMisc
             CSequence<CAircraftSituation>(other)
         { }
 
+        CAircraftSituationList::CAircraftSituationList(std::initializer_list<CAircraftSituation> il) :
+            CSequence<CAircraftSituation>(il)
+        { }
+
     } // namespace
 } // namespace

src/blackmisc/aviation/aircraftsituationlist.h

@@ -45,6 +45,8 @@ namespace BlackMisc
             //! Construct from a base class object.
             CAircraftSituationList(const CSequence<CAircraftSituation> &other);
 
+            //! Construct from initializer list.
+            CAircraftSituationList(std::initializer_list<CAircraftSituation> il);
         };
     } // namespace
 } // namespace

src/blackmisc/simulation/interpolator.cpp

@@ -265,12 +265,26 @@ namespace BlackMisc
         template <typename Derived>
         void CInterpolator<Derived>::addAircraftSituation(const CAircraftSituation &situation)
         {
+            if (m_aircraftSituations.isEmpty())
+            {
+                // make sure we have enough situations to do start interpolating immediately without waiting for more updates
+                m_aircraftSituations = { situation, situation };
+                m_aircraftSituations.back().addMsecs(-10000); // number here does
+                m_aircraftSituations.front().addMsecs(-5000); // not really matter
+            }
             m_aircraftSituations.push_frontMaxElements(situation, IRemoteAircraftProvider::MaxSituationsPerCallsign);
         }
 
         template <typename Derived>
         void CInterpolator<Derived>::addAircraftParts(const CAircraftParts &parts)
         {
+            if (m_aircraftParts.isEmpty())
+            {
+                // make sure we have enough parts to do start interpolating immediately without waiting for more updates
+                m_aircraftParts = { parts, parts };
+                m_aircraftParts.back().addMsecs(-10000); // number here does
+                m_aircraftParts.front().addMsecs(-5000); // not really matter
+            }
             m_aircraftParts.push_front(parts);
             IRemoteAircraftProvider::removeOutdatedParts(m_aircraftParts);
 

src/blackmisc/timestampbased.cpp

@@ -137,6 +137,11 @@ namespace BlackMisc
         this->m_timestampMSecsSinceEpoch = QDateTime::currentMSecsSinceEpoch();
     }
 
+    void ITimestampBased::addMsecs(qint64 ms)
+    {
+        this->m_timestampMSecsSinceEpoch += ms;
+    }
+
     QString ITimestampBased::getFormattedUtcTimestampDhms() const
     {
         return this->hasValidTimestamp() ?

src/blackmisc/timestampbased.h

@@ -86,6 +86,9 @@ namespace BlackMisc
         //! Set the current time as timestamp
         void setCurrentUtcTime();
 
+        //! Add the given number of milliseconds to the timestamp.
+        void addMsecs(qint64 ms);
+
         //! Formatted timestamp
         QString getFormattedUtcTimestampDhms() const;