exampleWindowObjectHud

Table of Contents

• Overview
• Example details
• Building the Example
• Running the Example
• Example Source Files
• DtWindowObjectHudDriver.h
• DtWindowObjectHudDriver.cxx
• exampleWindowObjectHudPluginInit.h
• exampleWindowObjectHudPluginInit.cxx
• DtHeadingTape.h
• DtHeadingTape.cxx
• DtPitchLadder.h
• DtPitchLadder.cxx
• DtHudConstants.h

Overview

Shows how to create and manipulate DtWindowObjects in VR-Vantage.

Example details

The VR-Vantage Control Toolkit lets you create 2D window objects such as lines, polygons and textboxes.

This example demonstrates an aircraft Head-Up Display (HUD), built using these window objects.

It gets the view orientation information from the observer to update a heading tape, pitch ladder, and horizon line.

The heading tape indicates the observer's heading from 0 to 360 degrees, and loops around when constantly moving in a circle.

The pitch ladder displays the observer pitch from -40 to + 40 degrees.

You can see the HUD moving by holding down the right mouse button and moving the observer view around. To roll the observer view, press 9 on the NUMPAD of the keyboard. To reset the view, press 5 on the NUMPAD of the keyboard.

Building the Example

VR-Vantage includes pre-built versions of the example plug-in. To build it yourself, follow the instructions at Building VR-Vantage Examples, Applications, and Plug-ins.

Running the Example

This example is a plug-in. You can run it by running ./bin/exampleWindowObjectHud_stealth.bat (on Windows from cmd.exe) or ./bin64/exampleWindowObjectHud_stealth.sh (on Linux). For more information about running examples, please see Running Applications and Examples.

Example Source Files

• DtWindowObjectHudDriver.h
• DtWindowObjectHudDriver.cxx
• exampleWindowObjectHudPluginInit.h
• exampleWindowObjectHudPluginInit.cxx
• DtHeadingTape.h
• DtHeadingTape.cxx
• DtPitchLadder.h
• DtPitchLadder.cxx
• DtHudConstants.h

---

DtWindowObjectHudDriver.h

// /****************************************************************************** 
// ** Copyright (c) 2020 MAK Technologies, Inc. 
// ** All rights reserved. 
// ******************************************************************************/ 


#pragma once

#include <vrvCore/DtDriver.h>
#include <vrvCore/DtAgentManager.h>

#include <matrix/vlVector.h>

namespace makVrv
{
   class DtWindowEllipseAgent;
   class DtPitchLadder;
   class DtHeadingTape;
   class DtObserver;
   class DtWindowObjectHudDriver : public DtDriver
   {
   public:
      DtWindowObjectHudDriver( DtAgentManager& agentManager, const std::string& instanceName );

      virtual ~DtWindowObjectHudDriver();

      virtual const std::string& className() const;
   protected:
      virtual bool onStart();

      virtual bool onStop();

      virtual bool onTick();

      DtWindowEllipseAgent* myCenterDot;

      DtPitchLadder* myPitchLadder;
      DtHeadingTape* myHeadingTape;
   };
}

DtWindowObjectHudDriver.cxx

// /****************************************************************************** 
// ** Copyright (c) 2020 MAK Technologies, Inc. 
// ** All rights reserved. 
// ******************************************************************************/ 


#include "DtWindowObjectHudDriver.h"

#include <vrvCore/DtDe.h>
#include <vrvCore/DtDriverManager.h>
#include <vrvCore/DtInputDriver.h>
#include <vrvCore/DtObserver.h>
#include <vrvCore/DtObserverObjectAgent.hpp>

#include <vrvCore/DtWindowObjectAgent.hpp>
#include <vrvCore/DtWindowPolygonAgent.hpp>
#include <vrvCore/DtWindowLineAgent.hpp>
#include <vrvCore/DtWindowTextAgent.hpp>
#include <vrvCore/DtWindowSurfaceAgent.hpp>
#include <vrvCore/DtWindowEllipseAgent.hpp>

#include <vrvCore/DtWindowObject.h>

#include <vrvCore/DtDisplayConfigurationGenerator.h>
#include <vrvCore/DtDriverManager.h>
#include <vrvCore/DtInputDriver.h>
#include <vrvCore/DtAttachManager.h>
#include <vrvCore/DtObserverModeManager.h>

#include "DtPitchLadder.h"
#include "DtHeadingTape.h"
#include "DtHudConstants.h"

#include <matrix/vlQuaternion.h>
#include <iostream>

namespace makVrv
{
   DtWindowObjectHudDriver::DtWindowObjectHudDriver(
      DtAgentManager& agentManager, const std::string& instanceName )
      : DtDriver( agentManager, instanceName )
      , myPitchLadder(0)
      , myHeadingTape(0)
      , myCenterDot(0)
   {
      // Tell the driver to start automatically when added to the DE
      setAutoStart( true );

      // This driver can't be started or stopped from the GUI; myUserControllableFlag sets this property
      myUserControllableFlag = false;

   }

   DtWindowObjectHudDriver::~DtWindowObjectHudDriver()
   {
   }
   const std::string& DtWindowObjectHudDriver::className() const
   {
      // name must be static, since it's returned by reference
      static std::string name( "DtWindowObjectHudDriver" );
      return name;
   }
  

   bool DtWindowObjectHudDriver::onStart()
   {
      // Iterate through displays
      DtDisplayConfigurations::const_iterator displayCurIter = myAgentManager.de().deConfiguration().displayConfigurations().begin();
      DtDisplayConfigurations::const_iterator displayEndIter = myAgentManager.de().deConfiguration().displayConfigurations().end();
      std::string dName;
      for ( ; displayCurIter != displayEndIter; ++displayCurIter )
      {
         DtDisplayConfiguration* dec = *displayCurIter;
         dName = dec->name();

         // Iterate through all the windows
         DtWindowConfigurations::const_iterator viewCurIter = dec->windowConfigurations().begin();
         DtWindowConfigurations::const_iterator viewEndIter = dec->windowConfigurations().end();
         for ( ; viewCurIter != viewEndIter; ++viewCurIter )
         {
            DtWindowConfiguration* wc = *viewCurIter;
            std::string wName = wc->name();
            if ( wName == "Window 1" )
            {
               wc->setSize( 1000, 1000 );
               DtDisplayProxySP display = myAgentManager.de().findDisplay( dName );
               if ( display )
               {
                  DtWindowProxySP window = display->findWindow( wName );
                  if ( window )
                  {
                     display->modifyWindow( window, *wc );
                  }
               }
            }
         }
      }

      // Create center dot
      myCenterDot = DtWindowEllipseAgent::create( myAgentManager );
      myCenterDot->setPosition( 0.5, 0.5 );
      myCenterDot->setNumVertices( 20 );
      myCenterDot->setDimensions( 0.005, 0.005 );
      myCenterDot->setColor( HudColorR, HudColorG, HudColorB, HudColorA );

      DtObserver* observer = myAgentManager.de().driverManager().inputDriver().findObserverByName(
         "Observer 1" );

      if ( observer )
      {
         observer->agent().resetAttachment();
         observer->agent().level();

         myPitchLadder = new DtPitchLadder( myAgentManager.de(), *observer );
         myHeadingTape = new DtHeadingTape( myAgentManager.de(), *observer );
         myPitchLadder->init();
         myHeadingTape->init();
      }
      return true ;
   }
   bool DtWindowObjectHudDriver::onStop()
   {
      if( myCenterDot )
      {
         delete myCenterDot;
         myCenterDot = 0;
      }
      if( myPitchLadder )
      {
         delete myPitchLadder;
         myPitchLadder = 0;
      }
      if( myHeadingTape )
      {
         delete myHeadingTape;
         myHeadingTape = 0;
      }
      return true;
   }

   bool DtWindowObjectHudDriver::onTick()
   {
      if( myPitchLadder  )
      {
         myPitchLadder->tick();
      }
      if( myHeadingTape )
      {
         myHeadingTape->tick();
      }
      return true;
   }
}

exampleWindowObjectHudPluginInit.h

/******************************************************************************
** Copyright (c) 2020 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once


// Get proper local export symbol
#include "exampleWindowObjectHudPlugin.h"

// Setup proper plugin export symbol
#define DT_DE_PLUGIN_EXPORT_MACRO DT_DLL_EXAMPLEWINDOWOBJECTHUD

// Declare & export the plugin initialization function (bool initDeModule(DtDe* de))
#include <vrvCore/exportPlugin.h>

namespace makVrv { class DtDe; }

// Work function for the plugin initialization
DT_DLL_EXAMPLEWINDOWOBJECTHUD void init( makVrv::DtDe& de);

void loadDriver( makVrv::DtDe* de );

exampleWindowObjectHudPluginInit.cxx

/******************************************************************************
** Copyright (c) 2020 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#include "exampleWindowObjectHudPluginInit.h"

#include <vrvCore/DtDe.h>
#include <vrvCore/DtDriverManager.h>
#include <vrvCore/DtInputDriver.h>
#include <vrvCore/DtAgentManager.h>

#include <boost/bind.hpp>
#include <string>

#include "DtWindowObjectHudDriver.h"

using namespace makVrv;


void init( DtDe& de )
{
   // Ensure that init only gets called once
   // (not strictly necessary here, but this is good practice in general)
   DT_DE_INIT_ONCE( de );
   // We only want to create the accessory if we're running in master mode:
   if ( de.isInMasterMode() )
   {
      // The accessory must be created after the DE's initialization is
      // finished, to make sure all the objects it uses exist.
      de.signal_postInitialize.connect( boost::bind( &loadDriver, &de ) );
   }
}

bool initDeModule( makVrv::DtDe* de )
{
   // Setup the plugin
   init( *de );
   return true;
}

void loadDriver( makVrv::DtDe* de )
{
   de->signal_postInitialize.disconnect( boost::bind(
      &loadDriver, de ) );

   DtWindowObjectHudDriver* driver = new DtWindowObjectHudDriver( de->agentManager(), "winowObjectHudDriver" );

   de->driverManager().addDriver( driver );
}

DtHeadingTape.h

// /****************************************************************************** 
// ** Copyright (c) 2020 MAK Technologies, Inc. 
// ** All rights reserved. 
// ******************************************************************************/ 


#pragma once

#include <vector>

// Use the VR-Vantage namespace.
// All classes in VR-Vantage are in this namespace.
namespace makVrv
{
   class DtDe;
   class DtWindowObjectAgent;
   class DtWindowSurfaceAgent;
   class DtObserver;

   class DtHeadingTape
   {
   public:
      DtHeadingTape( DtDe& de, DtObserver& observer );

      virtual ~DtHeadingTape();

      virtual void init();

      virtual void tick();
   protected:
      typedef std::vector<DtWindowObjectAgent*> DtWindowObjects;
   protected:
      DtDe& myDe;
      DtObserver& myObserver;
      DtWindowObjects myWindowAgents;
      DtWindowObjectAgent* myHeadingTapeLowObject;
      DtWindowObjectAgent* myheadingTapeHighObject;
      DtWindowSurfaceAgent* mySurface;
   };
}

DtHeadingTape.cxx

// /****************************************************************************** 
// ** Copyright (c) 2020 MAK Technologies, Inc. 
// ** All rights reserved. 
// ******************************************************************************/ 


#include "DtHeadingTape.h"
#include "DtHudConstants.h"

#include <vrvCore/DtDe.h>
#include <vrvCore/DtDriverManager.h>
#include <vrvCore/DtInputDriver.h>
#include <vrvCore/DtObserver.h>
#include <vrvCore/DtObserverObjectAgent.hpp>

#include <vrvCore/DtWindowObjectAgent.hpp>
#include <vrvCore/DtWindowPolygonAgent.hpp>
#include <vrvCore/DtWindowLineAgent.hpp>
#include <vrvCore/DtWindowTextAgent.hpp>
#include <vrvCore/DtWindowSurfaceAgent.hpp>
#include <vrvCore/DtWindowEllipseAgent.hpp>

#include <vrvCore/DtWindowObject.h>

#include <sstream>

namespace makVrv
{
   DtHeadingTape::DtHeadingTape( DtDe& de, DtObserver& observer )
      : myDe(de)
      , myWindowAgents()
      , mySurface(0)
      , myHeadingTapeLowObject( 0 )
      , myheadingTapeHighObject( 0 )
      , myObserver(observer)
   {
   }
   DtHeadingTape::~DtHeadingTape()
   {
      DtWindowObjects::iterator iter = myWindowAgents.begin();
      DtWindowObjects::iterator endIter = myWindowAgents.end();
      for ( ; iter != endIter; ++iter )
      {
         DtWindowObjectAgent* toDelete = *iter;
         delete toDelete;
         toDelete = 0;
      }
      myWindowAgents.clear();

      myHeadingTapeLowObject = 0;
      myheadingTapeHighObject = 0;
      mySurface = 0;
   }
   void DtHeadingTape::init()
   {
      mySurface = DtWindowSurfaceAgent::create( myDe.agentManager() );
      if ( mySurface )
      {
         // Screen is (0.0,0.0) bottom left corner to (1.0,1.0) top right corner
         mySurface->setPosition( 0.5, 0.85 );
         mySurface->setScale( 1.0, 0.25 );
         // This clip box will automatically clip any object outside it, provided
         // that the object is a child of this surface object
         mySurface->setClipBox( 0.4, 0.805, 0.6, 0.95 );

         myWindowAgents.push_back( mySurface );
      }
      else
      {
         return;
      }

      DtWindowPolygonAgent* headingArrow = DtWindowPolygonAgent::create( myDe.agentManager() );
      headingArrow->setVertex( 0, 0.0, 0.075 );
      headingArrow->setVertex( 1, 0.005, 0.045 );
      headingArrow->setVertex( 2, 0.00, 0.095 );
      headingArrow->setVertex( 3, -0.005, 0.045 );
      headingArrow->setColor( HudColorR, HudColorG, HudColorB, HudColorA );
      headingArrow->setFill( true );
      mySurface->addChild( headingArrow->uniqueId() );
      myWindowAgents.push_back( headingArrow );

      // These low and high heading objects are used to control the tapes
      // in the tick method. All of other heading lines are attached to these
      // as children. The heading lines are specified in the coordinate system 
      // of these objects
      myHeadingTapeLowObject = DtWindowLineAgent::create( myDe.agentManager() );
      myHeadingTapeLowObject->setPosition( 0.0, 0.0 );
      myWindowAgents.push_back( myHeadingTapeLowObject );
      mySurface->addChild( myHeadingTapeLowObject->uniqueId() );

      myheadingTapeHighObject = DtWindowLineAgent::create( myDe.agentManager() );
      myheadingTapeHighObject->setPosition( 0.0, 0.0 );
      myWindowAgents.push_back( myheadingTapeHighObject );
      mySurface->addChild( myheadingTapeHighObject->uniqueId() );

      for ( int i = 0; i <= 36; ++i )
      {
         DtWindowLineAgent* lowHeadingLine = DtWindowLineAgent::create( myDe.agentManager() );

         // Line every 5 degrees
         double xOffset = (HeadingScreenUnitsPerDegree * 5) * i;
         // 0 - 180 line
         lowHeadingLine->setVertex( 0, 0.0, 0.1 );
         lowHeadingLine->setVertex( 1, 0.0, 0.175 );
         lowHeadingLine->setColor( HudColorR, HudColorG, HudColorB, HudColorA );
         lowHeadingLine->setWidth( 3 );
         lowHeadingLine->setPosition( xOffset, 0.0 );
         myHeadingTapeLowObject->addChild( lowHeadingLine->uniqueId() );
         myWindowAgents.push_back( lowHeadingLine );

         // 180 - 0 line
         DtWindowLineAgent* highHeadingLine = DtWindowLineAgent::create( myDe.agentManager() );
         highHeadingLine->setVertex( 0, 0.0, 0.1 );
         highHeadingLine->setVertex( 1, 0.0, 0.175 );
         highHeadingLine->setColor( HudColorR, HudColorG, HudColorB, HudColorA );
         highHeadingLine->setWidth( 3 );
         highHeadingLine->setPosition( -xOffset, 0.0 );
         myheadingTapeHighObject->addChild( highHeadingLine->uniqueId() );
         myWindowAgents.push_back( highHeadingLine );

         if ( i % 2 == 0 ) // every second line
         {
            float textXOffset = (float)-0.005;
            float textYOffset = (float)0.05;
            DtWindowTextAgent* lowHeadingText = DtWindowTextAgent::create( myDe.agentManager() );
            lowHeadingText->setColor( HudColorR, HudColorG, HudColorB, HudColorA );
            lowHeadingText->setTopLeftCorner( (float)textXOffset, (float)textYOffset );
            
            std::ostringstream ss;
            ss << i / 2;
            std::string onScreenStr = ss.str();

            if ( i < 20 )
            {
               // pad a 0 for text str < 10 
               onScreenStr = "0" + onScreenStr;
            }
            lowHeadingText->setText( onScreenStr );
            lowHeadingText->setFont( "FreeMono.otf", HudFontSize );
            lowHeadingText->setVisible( true );
            lowHeadingText->setAlignment( 0 );

            lowHeadingLine->addChild( lowHeadingText->uniqueId() );
            myWindowAgents.push_back( lowHeadingText );

            DtWindowTextAgent* highHeadingText = DtWindowTextAgent::create( myDe.agentManager() );
            highHeadingText->setColor( HudColorR, HudColorG, HudColorB, HudColorA );
            highHeadingText->setTopLeftCorner( (float)textXOffset, (float)textYOffset );
            if ( i == 0 )
            {
               onScreenStr = "00";
            }
            else
            {
               ss.str( std::string() );
               int headingOutput = (36 - (i / 2));
               ss << headingOutput;
               onScreenStr = ss.str();
            }
            highHeadingText->setText( onScreenStr );
            highHeadingText->setFont( "FreeMono.otf", HudFontSize );
            highHeadingText->setVisible( true );
            highHeadingText->setAlignment( 0 );

            highHeadingLine->addChild( highHeadingText->uniqueId() );
            myWindowAgents.push_back( highHeadingText );
         }
      }
   }
   void DtHeadingTape::tick()
   {
      double curPhi, curTheta, curPsi;
      myObserver.getTopographicOrientation( curPhi, curTheta, curPsi );//ypr
      double xPos = 0.0;
      double yPos = 0.0;
      // The tapes are spilt in two so we do not need an endless tape. Imagine we are flying 
      // in a circle, or rotating in a hover, when the tape comes back around to 00 we slot
      // the 0->180 tape onto the end of 180->360. 
      if ( myHeadingTapeLowObject )
      {
         DtWindowObject* lowHeadingTape = myHeadingTapeLowObject->findObject();
         if ( lowHeadingTape )
         {
            lowHeadingTape->getPosition( xPos, yPos );
            if ( DtDeg2Rad( -180.0 ) < curPhi && curPhi < DtDeg2Rad( -135.0 ) )
            {
               // 0.015 = screen units per degree of rotation
               // the tape is 180 * 0.015 = 2.7
               // Tapes are centered on 0.0
               xPos = ((-180.0 - DtRad2Deg( curPhi )) * HeadingScreenUnitsPerDegree) - 2.7;
            }
            else
            {
               xPos = (DtRad2Deg( curPhi ) * (-HeadingScreenUnitsPerDegree));
            }
            myHeadingTapeLowObject->setPosition( xPos, yPos );
         }
      }
      if ( myheadingTapeHighObject )
      {

         DtWindowObject* highHeadingTape = myheadingTapeHighObject->findObject();
         if ( highHeadingTape )
         {
            highHeadingTape->getPosition( xPos, yPos );
            if ( DtDeg2Rad( 135.0 ) < curPhi && curPhi < DtDeg2Rad( 180.0 ) )
            {
               // 0.015 = screen units per degree of rotation
               // the tape is 180 * 0.015 = 2.7 long
               // Tapes are centered on 0.0
               xPos = ((180.0 - DtRad2Deg( curPhi )) * HeadingScreenUnitsPerDegree) + 2.7;
            }
            else
            {
               xPos = (DtRad2Deg( curPhi ) * (-HeadingScreenUnitsPerDegree));
            }
            myheadingTapeHighObject->setPosition( xPos, yPos );
         }
      }
   }
}

DtPitchLadder.h

// /****************************************************************************** 
// ** Copyright (c) 2020 MAK Technologies, Inc. 
// ** All rights reserved. 
// ******************************************************************************/ 


#pragma once

#include <vector>

// Use the VR-Vantage namespace.
// All classes in VR-Vantage are in this namespace.
namespace makVrv
{
   class DtDe;
   class DtWindowObjectAgent;
   class DtWindowSurfaceAgent;
   class DtObserver;
   
   class DtPitchLadder
   {
   public:
      DtPitchLadder( DtDe& de, DtObserver& observer );

      virtual ~DtPitchLadder();

      virtual void init();

      virtual void tick();
   protected:
      virtual void drawHorizon();
      virtual void drawPitchLadder();
   protected:
      typedef std::vector<DtWindowObjectAgent*> DtWindowObjects;
   protected:
      DtDe& myDe;
      DtWindowObjects myWindowAgents;
      DtWindowObjectAgent* myPitchLadderRootObject;

      DtWindowSurfaceAgent* mySurface;
      DtWindowObjectAgent* myHorizonRootObject;
      DtObserver& myObserver;

      double lastPhi;
      double lastTheta;
      double lastPsi;
   };
}

DtPitchLadder.cxx

// /****************************************************************************** 
// ** Copyright (c) 2020 MAK Technologies, Inc. 
// ** All rights reserved. 
// ******************************************************************************/ 


#include "DtPitchLadder.h"
#include "DtHudConstants.h"

#include <vrvCore/DtDe.h>
#include <vrvCore/DtDriverManager.h>
#include <vrvCore/DtInputDriver.h>
#include <vrvCore/DtObserver.h>
#include <vrvCore/DtObserverObjectAgent.hpp>

#include <vrvCore/DtWindowObjectAgent.hpp>
#include <vrvCore/DtWindowPolygonAgent.hpp>
#include <vrvCore/DtWindowLineAgent.hpp>
#include <vrvCore/DtWindowTextAgent.hpp>
#include <vrvCore/DtWindowSurfaceAgent.hpp>
#include <vrvCore/DtWindowEllipseAgent.hpp>

#include <vrvCore/DtWindowObject.h>

namespace makVrv
{
   DtPitchLadder::DtPitchLadder( DtDe& de, DtObserver& observer )
      : myDe(de)
      , myWindowAgents()
      , myPitchLadderRootObject(0)
      , mySurface(0)
      , lastPhi(0.0)
      , lastTheta(0.0)
      , lastPsi(0.0)
      , myObserver( observer )
      , myHorizonRootObject(0)
   {
   }
   DtPitchLadder::~DtPitchLadder()
   {
      DtWindowObjects::iterator iter = myWindowAgents.begin();
      DtWindowObjects::iterator endIter = myWindowAgents.end();
      for ( ; iter != endIter; ++iter )
      {
         DtWindowObjectAgent* toDelete = *iter;
         delete toDelete;
         toDelete = 0;
      }
      myWindowAgents.clear();

      myPitchLadderRootObject = 0;
      mySurface = 0;
   }
   void DtPitchLadder::init()
   {
      myObserver.getTopographicOrientation( lastPhi, lastTheta, lastPsi );

      mySurface = DtWindowSurfaceAgent::create( myDe.agentManager() );
      if ( mySurface )
      {
         // Screen is (0.0,0.0) bottom left corner to (1.0,1.0) top right corner
         // This clip box will automatically clip any object outside it, provided
         // that the object is a child of this surface object
         mySurface->setClipBox( 0.25, 0.2, 0.75, 0.8 );
         mySurface->setPosition( 0.5, 0.5 );
         // non uni-form scales on surfaces will currently not work]
         // if you wish to rotate all the children attached to the
         // surface
         mySurface->setScale( 1.0, 1.0 ); 
         mySurface->setScaleToClipBox( false );
         myWindowAgents.push_back( mySurface );
      }
      drawPitchLadder();
      drawHorizon();
   }
   void DtPitchLadder::tick()
   {
      double curPhi, curTheta, curPsi;
      myObserver.getTopographicOrientation( curPhi, curTheta, curPsi );//ypr
      double x = 0.0;
      double y = 0.0;

      // Update Pitch Ladder
      if ( myPitchLadderRootObject )
      {
         DtWindowObject* pitchLadderRoot = myPitchLadderRootObject->findObject();
         if ( pitchLadderRoot )
         {
            // current pitch * units per degree between pitch lines 
            // pitch lines are separated by 0.25 units.

            double pTranslatDist = DtRad2Deg( curTheta ) * (PitchScreenUnitsPerDegree * 0.6);
            
            x = -std::sin( curPsi ) * pTranslatDist;
            y = std::cos( curPsi ) * pTranslatDist;

            myPitchLadderRootObject->setPosition( -x, -y );
            myPitchLadderRootObject->setRotation( curPsi );
         }
      }

      // Update Horizon
      if ( myHorizonRootObject )
      {
         DtWindowObject* horizonRoot = myHorizonRootObject->findObject();
         if ( horizonRoot )
         {
            // change in pitch * half height of screen (0.5) * top half fov degrees (22.5)
            double pTranslatDist = -DtRad2Deg( curTheta ) * ((0.5) / 22.5);

            x = -std::sin( curPsi ) * pTranslatDist;
            y = std::cos( curPsi ) * pTranslatDist;

            myHorizonRootObject->setPosition( x, y );
         }

         if (curPsi != lastPsi)
         {
            myHorizonRootObject->setRotation(curPsi);
         }
      }

   lastPsi = curPsi;
   lastTheta = curTheta;
   lastPhi = curPhi;   
   }

   void DtPitchLadder::drawHorizon()
   {
      myHorizonRootObject = DtWindowLineAgent::create( myDe.agentManager() );
      myHorizonRootObject->setPosition( 0.0, 0.0 );
      myWindowAgents.push_back( myHorizonRootObject );
      mySurface->addChild( myHorizonRootObject->uniqueId() );

      DtWindowLineAgent* leftHorizon = DtWindowLineAgent::create( myDe.agentManager() );
      leftHorizon->setVertex( 0, -0.13, 0.0 );
      leftHorizon->setVertex( 1, -0.20, 0.0 );
      leftHorizon->setVertex( 2, -0.20, -0.025 );
      leftHorizon->setColor( HudColorR, HudColorG, HudColorB, HudColorA );
      leftHorizon->setWidth( 3 );
      myHorizonRootObject->addChild( leftHorizon->uniqueId() );
      myWindowAgents.push_back( leftHorizon );

      DtWindowLineAgent* rightHorizon = DtWindowLineAgent::create( myDe.agentManager() );
      rightHorizon->setVertex( 0, 0.13, 0.0 );
      rightHorizon->setVertex( 1, 0.20, 0.0 );
      rightHorizon->setVertex( 2, 0.20, -0.025 );
      rightHorizon->setColor( HudColorR, HudColorG, HudColorB, HudColorA );
      rightHorizon->setWidth( 3 );
      myHorizonRootObject->addChild( rightHorizon->uniqueId() );
      myWindowAgents.push_back( rightHorizon );
   }
   void DtPitchLadder::drawPitchLadder()
   {
      myPitchLadderRootObject = DtWindowLineAgent::create( myDe.agentManager() );
      myPitchLadderRootObject->setPosition( 0.0, 0.0 );
      myWindowAgents.push_back( myPitchLadderRootObject );
      mySurface->addChild( myPitchLadderRootObject->uniqueId() );

      for ( int i = -8; i <= 8; i = i + 1 )
      {
         DtWindowLineAgent* pitchLine = DtWindowLineAgent::create( myDe.agentManager() );
         // 5 Degrees between each line
         double totalOffset = PitchScreenUnitsPerDegree * 5 * i;

         double invertLine = 0.0;
         if ( i < 0 )
         {
            invertLine = 0.015;
            pitchLine->setSegmentStipplePattern( 2, 1, 0x00FF );

         }
         else if ( i == 0 )
         {
            invertLine = 0.0075;
         }

         pitchLine->setVertex( 0, -0.1, (invertLine - 0.0075) + totalOffset );
         pitchLine->setVertex( 1, -0.1, 0.0 + totalOffset );
         pitchLine->setVertex( 2, -0.1, 0.0 + totalOffset );
         pitchLine->setVertex( 3, 0.1, 0.0 + totalOffset );
         pitchLine->setVertex( 4, 0.1, (invertLine - 0.0075) + totalOffset );
         pitchLine->setVertex( 5, 0.1, 0.0 + totalOffset );
         pitchLine->setColor( HudColorR, HudColorG, HudColorB, HudColorA );
         pitchLine->setWidth( 3 );
         myPitchLadderRootObject->addChild( pitchLine->uniqueId() );
         myWindowAgents.push_back( pitchLine );

         DtWindowTextAgent* pitchTextRight = DtWindowTextAgent::create( myDe.agentManager() );
         pitchTextRight->setColor( 0.0, 1.0, 0.0, 1.0 );
         pitchTextRight->setTopLeftCorner( (float)0.105, (float) -0.006 + totalOffset );
         
         std::ostringstream ss;
         ss << std::abs( 5 * i );

         pitchTextRight->setText( ss.str() );

         pitchTextRight->setFont( "FreeMono.otf", HudFontSize );
         pitchTextRight->setVisible( true );
         pitchTextRight->setAlignment( 0 );

         myPitchLadderRootObject->addChild( pitchTextRight->uniqueId() );
         myWindowAgents.push_back( pitchTextRight );

         DtWindowTextAgent* pitchTextLeft = DtWindowTextAgent::create( myDe.agentManager() );
         pitchTextLeft->setColor( HudColorR, HudColorG, HudColorB, HudColorA );
         pitchTextLeft->setTopLeftCorner( (float) -0.135, (float) -0.006 + totalOffset );
         pitchTextLeft->setText( ss.str() );
         pitchTextLeft->setFont( "FreeMono.otf", HudFontSize );
         pitchTextLeft->setVisible( true );
         pitchTextLeft->setAlignment( 2 ); // right
         pitchTextLeft->setTextBoxWidth( 28 );

         myPitchLadderRootObject->addChild( pitchTextLeft->uniqueId() );
         myWindowAgents.push_back( pitchTextLeft );
      }
   }
}

DtHudConstants.h

// /****************************************************************************** 
// ** Copyright (c) 2020 MAK Technologies, Inc. 
// ** All rights reserved. 
// ******************************************************************************/ 


#pragma once

#define HudFontSize 16
#define HudColorG 1.0
#define HudColorB 0.0
#define HudColorR 0.0
#define HudColorA 1.0

#define PitchScreenUnitsPerDegree 0.05
#define HeadingScreenUnitsPerDegree 0.015

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