Ghost finish times based on replay data (#3262)

* New ghost kart function to compute finish time

* Don't estimate the finish time for ghosts, use replay data

src/karts/ghost_kart.cpp

@@ -27,6 +27,7 @@
 #include "modes/linear_world.hpp"
 #include "modes/world.hpp"
 #include "replay/replay_recorder.hpp"
+#include "tracks/track.hpp"
 
 #include "LinearMath/btQuaternion.h"
 
@@ -234,6 +235,23 @@ float GhostKart::getSpeed() const
            +  rd *m_all_physic_info[current_index + 1].m_speed;
 }   // getSpeed
 
+// ----------------------------------------------------------------------------
+/** Compute the time at which the ghost finished the race */
+void GhostKart::computeFinishTime()
+{
+    // In egg hunts, the finish time is the moment at which all egs are collected
+    if (race_manager->isEggHuntMode())
+    {
+        m_finish_time = 0; //FIXME : do a real computation
+    }
+    else // linear races
+    {
+        float full_distance = race_manager->getNumLaps()
+                            * Track::getCurrentTrack()->getTrackLength();
+        m_finish_time = getTimeForDistance(full_distance);
+    }
+}
+
 // ----------------------------------------------------------------------------
 /** Returns the time at which the kart was at a given distance.
   * Returns -1.0f if none */

src/karts/ghost_kart.hpp

@@ -48,6 +48,10 @@ private:
 
     unsigned int                             m_last_egg_idx = 0;
 
+    // ----------------------------------------------------------------------------
+    /** Compute the time at which the ghost finished the race */
+    void          computeFinishTime();
+
 public:
                   GhostKart(const std::string& ident, unsigned int world_kart_id,
                             int position, float color_hue);
@@ -82,6 +86,10 @@ public:
     /** Returns the speed of the kart in meters/second. */
     virtual float getSpeed() const OVERRIDE;
 
+    // ------------------------------------------------------------------------
+    /** Returns the finished time for a ghost kart. */
+    float  getGhostFinishTime() { computeFinishTime(); return m_finish_time; }
+
     // ------------------------------------------------------------------------
     /** Returns the time at which the kart was at a given distance.
       * Returns -1.0f if none */
@@ -93,3 +101,4 @@ public:
     
 };   // GhostKart
 #endif
+

src/modes/linear_world.cpp

@@ -25,6 +25,7 @@
 #include "config/user_config.hpp"
 #include "karts/abstract_kart.hpp"
 #include "karts/controller/controller.hpp"
+#include "karts/ghost_kart.hpp"
 #include "karts/kart_properties.hpp"
 #include "graphics/material.hpp"
 #include "guiengine/modaldialog.hpp"
@@ -621,6 +622,13 @@ float LinearWorld::estimateFinishTimeForKart(AbstractKart* kart)
     float full_distance = race_manager->getNumLaps()
                         * Track::getCurrentTrack()->getTrackLength();
 
+    // For ghost karts, use the replay data rather than estimating
+    if (kart->isGhostKart())
+    {
+        GhostKart* gk = dynamic_cast<GhostKart*>(kart);
+        return gk->getGhostFinishTime();
+    }
+
     if(full_distance == 0)
         full_distance = 1.0f;   // For 0 lap races avoid warning below