Environmental Process Example

Table of Contents

• Implementation of Environmental Process Objects
• Example Code
  • Environmental Process Publisher
  • Environmental Process Listener

Some sample code to demonstrait the usage of Environmental Process Objects in VR-Link.

Environmental Process objects represent things happening in the simulated environment like chemical clouds, chaff, or vapor trails.

Implementation of Environmental Process Objects

Environmental Process Objects are implemented in four main classes

• DtEnvironmentProcessPublisher The class used by the simulator of the Environmental Process
• DtReflectedEnvironmentProcess A class used by the viewer of the Environmental Process to represent a single Process
• DtReflectedEnvironmentProcessList A class used by the viewer of the Environmental Process
• DtEnvironmentProcessRepository A class used to hold the State of the object in each of the above classes

Example Code

Environmental Process Publisher

A function which creates and publishes an Environmental Process Object.

#include <vl/environmentProcessRepository.h>
#include <vl/environmentProcessPublisher.h>

#include "PointRec.h"
#include "Point2Rec.h"
#include <iostream>

class DtExerciseConn;

void publishEnvPro(DtExerciseConn *exConn)
{
   // Create publishers
   DtEnvironmentProcessPublisher pub(exConn);

   // Hold on to its state repository, where we can set data
   DtEnvironmentProcessRepository &esr = *pub.epsr();


   // Fill in unrealistic sample data
   DtEntityIdentifier entId("1:3:1");
   DtEnvironmentTypeRecord envType;

   envType.setClassOfEnv(1);
   envType.setKind(2);
   envType.setDomain(3);
   envType.setCategory(4);
   envType.setSubCategory(5);
   envType.setSpecific(6);
   envType.setExtra(7);

   esr.setEnvironmentalProcessID(entId);
   esr.setEnvironmentType(envType);
   esr.setModelType(DtEnvironmentModelUnknown);
   esr.setEnvironmentalStatus(DtTrue);
   esr.setSequenceNumber(10);
   esr.setNumberOfEnvironmentalRecords(3);

   int size = (sizeof(Point1GeometryData) - sizeof(DtNetEnvironmentalRecord))*8;
   if (esr.setRecordBitSize(0, size) && esr.setRecordBitSize(1, size) &&
       esr.setRecordBitSize(2, size))
   {
      std::cout<< "Setting size was successful" << std::endl;
   }
   else
   {
      std::cout<< "Setting size was unsucessfull" << std::endl;
   }

   for ( int i = 0; i < esr.numberOfEnvironmentalRecords(); i++)
   {
      Point1GeometryData* rec = (Point1GeometryData*) esr.recordPointer(i);
      rec->myIndex = i;
      rec->myType = DtPointRecord1Type;
      rec->pos[0] = i*10 + 10;
      rec->pos[1] = i*10 + 10;
      rec->pos[2] = i*10 + 10;
   }

}
    

Environmental Process Listener

Sample code to listen for Environmental Process objects.

#include <vl/fom.h>
#include <vl/environmentProcessRepository.h>
#include <vl/reflectedEnvironmentProcess.h>
#include <vl/reflectedEnvironmentProcessList.h>


class DtExerciseConn;


// A callback for when a DtReflectedEnvironmentProcess object is updated.
void printEnvProc(DtReflectedEnvironmentProcess* obj, void* userData)
{
  obj->epsr()->printData();
}

// A callback for when a new DtReflectedEnvironmentProcess object is added.
void envProcAddedCb(DtReflectedEnvironmentProcess* obj, void* userData)
{
   // register a callback for when an existing object is updated. 
   obj->addPostUpdateCallback(printEnvProc, userData);
}

// Create a reflected list and register interest in object creation.
void listenEnvProc(DtExerciseConn *exConn)
{
   DtReflectedEnvironmentProcessList rel(exConn);
   rel.addEnvironmentProcessAdditionCallback(envProcAddedCb, NULL);
}