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/*  Project STARSHATTER
    John DiCamillo
    Copyright © 1997-2002. All Rights Reserved.

    SUBSYSTEM:    Stars.exe
    FILE:         Contact.h
    AUTHOR:       John DiCamillo


    OVERVIEW
    ========
    Sensor Contact class
*/

#ifndef Contact_h
#define Contact_h

#include "Types.h"
#include "SimObject.h"
#include "System.h"
#include "Geometry.h"

// +--------------------------------------------------------------------+

class Ship;
class Shot;

class Contact : public SimObserver
{
   friend class Sensor;

public:
   static const char* TYPENAME() { return "Contact"; }

   Contact();
   Contact(Ship* s, float p, float a);
   Contact(Shot* s, float p, float a);
   virtual ~Contact();

   int operator == (const Contact& c) const;

   Ship*    GetShip()   const { return ship;  }
   Shot*    GetShot()   const { return shot;  }
   Point    Location()  const { return loc;   }

   double   PasReturn() const { return d_pas; }
   double   ActReturn() const { return d_act; }
   bool     PasLock()   const;
   bool     ActLock()   const;
   double   Age()       const;
   bool     IsProbed()  const { return probe; }

   DWORD    AcquisitionTime() const { return acquire_time; }

   int      GetIFF(const Ship* observer)    const;
   void     GetBearing(const Ship* observer, double& az, double& el, double& r) const;
   double   Range(const Ship* observer,
                  double      limit=75e3)   const;

   bool     InFront(const Ship* observer)   const;
   bool     Threat(const Ship* observer)    const;
   bool     Visible(const Ship* observer)   const;

   void     Reset();
   void     Merge(Contact* c);
   void     ClearTrack();
   void     UpdateTrack();
   int      TrackLength()     const { return ntrack;   }
   Point    TrackPoint(int i) const;

   virtual bool         Update(SimObject* obj);
   virtual const char*  GetObserverName() const;

private:
   Ship*    ship;
   Shot*    shot;
   Point    loc;
   DWORD    acquire_time;
   DWORD    time;

   Point*   track;
   int      ntrack;
   DWORD    track_time;

   float    d_pas;   // power output
   float    d_act;   // mass, size
   bool     probe;   // scanned by probe
};

#endif Contact_h