From 60c70c34f641c5772fb273bd80c0453f13d40837 Mon Sep 17 00:00:00 2001
From: Klaus Basan <klaus.basan@klausbasan.de>
Date: Mon, 26 Mar 2018 00:55:10 +0200
Subject: [PATCH] Ref T259, Ref T243 prefill provider situations, so
 interpolator can immediately start

---
 .../simulation/remoteaircraftprovider.cpp          |  9 ++++++++-
 src/blackmisc/timestampobjectlist.cpp              | 14 ++++++++++++++
 src/blackmisc/timestampobjectlist.h                |  3 +++
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/src/blackmisc/simulation/remoteaircraftprovider.cpp b/src/blackmisc/simulation/remoteaircraftprovider.cpp
index ef9cf8acf..81e3aedb5 100644
--- a/src/blackmisc/simulation/remoteaircraftprovider.cpp
+++ b/src/blackmisc/simulation/remoteaircraftprovider.cpp
@@ -167,7 +167,14 @@ namespace BlackMisc
             // list from new to old
             QWriteLocker lock(&m_lockSituations);
             CAircraftSituationList &situationList = m_situationsByCallsign[situation.getCallsign()];
-            situationList.push_frontKeepLatestFirstAdjustOffset(situation, IRemoteAircraftProvider::MaxSituationsPerCallsign);
+            if (situationList.isEmpty())
+            {
+                situationList.prefillLatestAdjustedFirst(situation, IRemoteAircraftProvider::MaxSituationsPerCallsign);
+            }
+            else
+            {
+                situationList.push_frontKeepLatestFirstAdjustOffset(situation, IRemoteAircraftProvider::MaxSituationsPerCallsign);
+            }
 
             // check sort order
             Q_ASSERT_X(situationList.isSortedAdjustedLatestFirst(), Q_FUNC_INFO, "wrong sort order");
diff --git a/src/blackmisc/timestampobjectlist.cpp b/src/blackmisc/timestampobjectlist.cpp
index 9f108c1d1..9e7db1548 100644
--- a/src/blackmisc/timestampobjectlist.cpp
+++ b/src/blackmisc/timestampobjectlist.cpp
@@ -377,6 +377,20 @@ namespace BlackMisc
         //  0: os 5 adj  5
     }
 
+    template<class OBJ, class CONTAINER>
+    void ITimestampWithOffsetObjectList<OBJ, CONTAINER>::prefillLatestAdjustedFirst(const OBJ &value, int elements, qint64 deltaTimeMs)
+    {
+        this->container().clear();
+        const qint64 os = -1 * qAbs(deltaTimeMs < 0 ? value.getTimeOffsetMs() : deltaTimeMs);
+        this->container().push_front(value);
+        for (int i = 1; i < elements; i++)
+        {
+            OBJ copy(value);
+            copy.addMsecs(os * i);
+            this->container().push_back(copy);
+        }
+    }
+
     template<class OBJ, class CONTAINER>
     bool ITimestampWithOffsetObjectList<OBJ, CONTAINER>::isSortedAdjustedLatestLast() const
     {
diff --git a/src/blackmisc/timestampobjectlist.h b/src/blackmisc/timestampobjectlist.h
index ed97760c1..67171c916 100644
--- a/src/blackmisc/timestampobjectlist.h
+++ b/src/blackmisc/timestampobjectlist.h
@@ -147,6 +147,9 @@ namespace BlackMisc
         //! \remark adjust offset to average offset of two adjacent elements so adjusted values are sorted
         void push_frontKeepLatestFirstAdjustOffset(const OBJ &value, int maxElements = -1);
 
+        //! Prefill with elements
+        void prefillLatestAdjustedFirst(const OBJ &value, int elements, qint64 deltaTimeMs = -1);
+
         //! Is completely sorted: latest last
         //! \remark all object must have a valid timestamp
         bool isSortedAdjustedLatestLast() const;