--- **Core** -- **POINT\_VEC** classes define an **extensive API** to **manage 3D points** in the simulation space.
--
-- ===
--
-- # Demo Missions
--
-- ### [POINT_VEC Demo Missions source code]()
--
-- ### [POINT_VEC Demo Missions, only for beta testers]()
--
-- ### [ALL Demo Missions pack of the last release](https://github.com/FlightControl-Master/MOOSE_MISSIONS/releases)
--
-- ===
--
-- # YouTube Channel
--
-- ### [POINT_VEC YouTube Channel]()
--
-- ===
--
-- ### Authors:
--
--   * FlightControl : Design & Programming
--
-- ### Contributions:
--
-- @module Core.Point
-- @image Core_Coordinate.JPG




do -- COORDINATE

  --- @type COORDINATE
  -- @extends Core.Base#BASE
  
  
  --- Defines a 3D point in the simulator and with its methods, you can use or manipulate the point in 3D space.
  --
  -- ## COORDINATE constructor
  --
  -- A new COORDINATE object can be created with:
  --
  --  * @{#COORDINATE.New}(): a 3D point.
  --  * @{#COORDINATE.NewFromVec2}(): a 2D point created from a @{DCS#Vec2}.
  --  * @{#COORDINATE.NewFromVec3}(): a 3D point created from a @{DCS#Vec3}.
  --
  -- ## Create waypoints for routes
  --
  -- A COORDINATE can prepare waypoints for Ground and Air groups to be embedded into a Route.
  --
  --   * @{#COORDINATE.WaypointAir}(): Build an air route point.
  --   * @{#COORDINATE.WaypointGround}(): Build a ground route point.
  --
  -- Route points can be used in the Route methods of the @{Wrapper.Group#GROUP} class.
  --
  --
  -- ## Smoke, flare, explode, illuminate
  --
  -- At the point a smoke, flare, explosion and illumination bomb can be triggered. Use the following methods:
  --
  -- ### Smoke
  --
  --   * @{#COORDINATE.Smoke}(): To smoke the point in a certain color.
  --   * @{#COORDINATE.SmokeBlue}(): To smoke the point in blue.
  --   * @{#COORDINATE.SmokeRed}(): To smoke the point in red.
  --   * @{#COORDINATE.SmokeOrange}(): To smoke the point in orange.
  --   * @{#COORDINATE.SmokeWhite}(): To smoke the point in white.
  --   * @{#COORDINATE.SmokeGreen}(): To smoke the point in green.
  --
  -- ### Flare
  --
  --   * @{#COORDINATE.Flare}(): To flare the point in a certain color.
  --   * @{#COORDINATE.FlareRed}(): To flare the point in red.
  --   * @{#COORDINATE.FlareYellow}(): To flare the point in yellow.
  --   * @{#COORDINATE.FlareWhite}(): To flare the point in white.
  --   * @{#COORDINATE.FlareGreen}(): To flare the point in green.
  --
  -- ### Explode
  --
  --   * @{#COORDINATE.Explosion}(): To explode the point with a certain intensity.
  --
  -- ### Illuminate
  --
  --   * @{#COORDINATE.IlluminationBomb}(): To illuminate the point.
  --
  --
  -- ## Markings
  -- 
  -- Place markers (text boxes with clarifications for briefings, target locations or any other reference point) on the map for all players, coalitions or specific groups:
  -- 
  --   * @{#COORDINATE.MarkToAll}(): Place a mark to all players.
  --   * @{#COORDINATE.MarkToCoalition}(): Place a mark to a coalition.
  --   * @{#COORDINATE.MarkToCoalitionRed}(): Place a mark to the red coalition.
  --   * @{#COORDINATE.MarkToCoalitionBlue}(): Place a mark to the blue coalition.
  --   * @{#COORDINATE.MarkToGroup}(): Place a mark to a group (needs to have a client in it or a CA group (CA group is bugged)).
  --   * @{#COORDINATE.RemoveMark}(): Removes a mark from the map.
  --   
  --
  -- ## 3D calculation methods
  --
  -- Various calculation methods exist to use or manipulate 3D space. Find below a short description of each method:
  --
  -- ### Distance
  --
  --   * @{#COORDINATE.Get3DDistance}(): Obtain the distance from the current 3D point to the provided 3D point in 3D space.
  --   * @{#COORDINATE.Get2DDistance}(): Obtain the distance from the current 3D point to the provided 3D point in 2D space.
  --
  -- ### Angle
  --
  --   * @{#COORDINATE.GetAngleDegrees}(): Obtain the angle in degrees from the current 3D point with the provided 3D direction vector.
  --   * @{#COORDINATE.GetAngleRadians}(): Obtain the angle in radians from the current 3D point with the provided 3D direction vector.
  --   * @{#COORDINATE.GetDirectionVec3}(): Obtain the 3D direction vector from the current 3D point to the provided 3D point.
  --
  -- ### Translation
  --
  --   * @{#COORDINATE.Translate}(): Translate the current 3D point towards an other 3D point using the given Distance and Angle.
  --
  -- ### Get the North correction of the current location
  --
  --   * @{#COORDINATE.GetNorthCorrection}(): Obtains the north correction at the current 3D point.
  --
  --
  -- ## Point Randomization
  --
  -- Various methods exist to calculate random locations around a given 3D point.
  --
  --   * @{#COORDINATE.GetRandomVec2InRadius}(): Provides a random 2D vector around the current 3D point, in the given inner to outer band.
  --   * @{#COORDINATE.GetRandomVec3InRadius}(): Provides a random 3D vector around the current 3D point, in the given inner to outer band.
  --
  --
  -- ## Metric system
  --
  --   * @{#COORDINATE.IsMetric}(): Returns if the 3D point is Metric or Nautical Miles.
  --   * @{#COORDINATE.SetMetric}(): Sets the 3D point to Metric or Nautical Miles.
  --
  --
  -- ## Coorinate text generation
  --
  --   * @{#COORDINATE.ToStringBR}(): Generates a Bearing & Range text in the format of DDD for DI where DDD is degrees and DI is distance.
  --   * @{#COORDINATE.ToStringLL}(): Generates a Latutude & Longutude text.
  --
  -- @field #COORDINATE
  COORDINATE = {
    ClassName = "COORDINATE",
  }

  --- @field COORDINATE.WaypointAltType 
  COORDINATE.WaypointAltType = {
    BARO = "BARO",
    RADIO = "RADIO",
  }
  
  --- @field COORDINATE.WaypointAction 
  COORDINATE.WaypointAction = {
    TurningPoint = "Turning Point",
    FlyoverPoint = "Fly Over Point",
    FromParkingArea = "From Parking Area",
    FromParkingAreaHot = "From Parking Area Hot",
    FromRunway = "From Runway",
    Landing = "Landing",
  }

  --- @field COORDINATE.WaypointType 
  COORDINATE.WaypointType = {
    TakeOffParking = "TakeOffParking",
    TakeOffParkingHot = "TakeOffParkingHot",
    TakeOff = "TakeOffParkingHot",
    TurningPoint = "Turning Point",
    Land = "Land",
  }


  --- COORDINATE constructor.
  -- @param #COORDINATE self
  -- @param DCS#Distance x The x coordinate of the Vec3 point, pointing to the North.
  -- @param DCS#Distance y The y coordinate of the Vec3 point, pointing to the Right.
  -- @param DCS#Distance z The z coordinate of the Vec3 point, pointing to the Right.
  -- @return #COORDINATE
  function COORDINATE:New( x, y, z ) 

    local self = BASE:Inherit( self, BASE:New() ) -- #COORDINATE
    self.x = x
    self.y = y
    self.z = z
    
    return self
  end

  --- COORDINATE constructor.
  -- @param #COORDINATE self
  -- @param #COORDINATE Coordinate.
  -- @return #COORDINATE
  function COORDINATE:NewFromCoordinate( Coordinate ) 

    local self = BASE:Inherit( self, BASE:New() ) -- #COORDINATE
    self.x = Coordinate.x
    self.y = Coordinate.y
    self.z = Coordinate.z
    
    return self
  end

  --- Create a new COORDINATE object from  Vec2 coordinates.
  -- @param #COORDINATE self
  -- @param DCS#Vec2 Vec2 The Vec2 point.
  -- @param DCS#Distance LandHeightAdd (optional) The default height if required to be evaluated will be the land height of the x, y coordinate. You can specify an extra height to be added to the land height.
  -- @return #COORDINATE
  function COORDINATE:NewFromVec2( Vec2, LandHeightAdd ) 

    local LandHeight = land.getHeight( Vec2 )
    
    LandHeightAdd = LandHeightAdd or 0
    LandHeight = LandHeight + LandHeightAdd

    local self = self:New( Vec2.x, LandHeight, Vec2.y ) -- #COORDINATE

    self:F2( self )

    return self

  end

  --- Create a new COORDINATE object from  Vec3 coordinates.
  -- @param #COORDINATE self
  -- @param DCS#Vec3 Vec3 The Vec3 point.
  -- @return #COORDINATE
  function COORDINATE:NewFromVec3( Vec3 ) 

    local self = self:New( Vec3.x, Vec3.y, Vec3.z ) -- #COORDINATE

    self:F2( self )

    return self
  end
  

  --- Return the coordinates of the COORDINATE in Vec3 format.
  -- @param #COORDINATE self
  -- @return DCS#Vec3 The Vec3 format coordinate.
  function COORDINATE:GetVec3()
    return { x = self.x, y = self.y, z = self.z }
  end


  --- Return the coordinates of the COORDINATE in Vec2 format.
  -- @param #COORDINATE self
  -- @return DCS#Vec2 The Vec2 format coordinate.
  function COORDINATE:GetVec2()
    return { x = self.x, y = self.z }
  end

  --- Returns the coordinate from the latitude and longitude given in decimal degrees.
  -- @param #COORDINATE self
  -- @param #number latitude Latitude in decimal degrees.
  -- @param #number longitude Longitude in decimal degrees.
  -- @param #number altitude (Optional) Altitude in meters. Default is the land height at the coordinate.
  -- @return #COORDINATE
  function COORDINATE:NewFromLLDD( latitude, longitude, altitude)
    
    -- Returns a point from latitude and longitude in the vec3 format.
    local vec3=coord.LLtoLO(latitude, longitude)
    
    -- Convert vec3 to coordinate object.
    local _coord=self:NewFromVec3(vec3)
    
    -- Adjust height
    if altitude==nil then
      _coord.y=altitude
    end

    return _coord
  end

  
  --- Returns if the 2 coordinates are at the same 2D position.
  -- @param #COORDINATE self
  -- @param #COORDINATE Coordinate
  -- @param #number Precision
  -- @return #boolean true if at the same position.
  function COORDINATE:IsAtCoordinate2D( Coordinate, Precision )
    
    self:F( { Coordinate = Coordinate:GetVec2() } )
    self:F( { self = self:GetVec2() } )
    
    local x = Coordinate.x
    local z = Coordinate.z
    
    return x - Precision <= self.x and x + Precision >= self.x and z - Precision <= self.z and z + Precision >= self.z   
  end
  
  

  --- Calculate the distance from a reference @{#COORDINATE}.
  -- @param #COORDINATE self
  -- @param #COORDINATE PointVec2Reference The reference @{#COORDINATE}.
  -- @return DCS#Distance The distance from the reference @{#COORDINATE} in meters.
  function COORDINATE:DistanceFromPointVec2( PointVec2Reference )
    self:F2( PointVec2Reference )

    local Distance = ( ( PointVec2Reference.x - self.x ) ^ 2 + ( PointVec2Reference.z - self.z ) ^2 ) ^ 0.5

    self:T2( Distance )
    return Distance
  end

  --- Add a Distance in meters from the COORDINATE orthonormal plane, with the given angle, and calculate the new COORDINATE.
  -- @param #COORDINATE self
  -- @param DCS#Distance Distance The Distance to be added in meters.
  -- @param DCS#Angle Angle The Angle in degrees.
  -- @return #COORDINATE The new calculated COORDINATE.
  function COORDINATE:Translate( Distance, Angle )
    local SX = self.x
    local SY = self.z
    local Radians = Angle / 180 * math.pi
    local TX = Distance * math.cos( Radians ) + SX
    local TY = Distance * math.sin( Radians ) + SY

    return COORDINATE:NewFromVec2( { x = TX, y = TY } )
  end

  --- Return a random Vec2 within an Outer Radius and optionally NOT within an Inner Radius of the COORDINATE.
  -- @param #COORDINATE self
  -- @param DCS#Distance OuterRadius
  -- @param DCS#Distance InnerRadius
  -- @return DCS#Vec2 Vec2
  function COORDINATE:GetRandomVec2InRadius( OuterRadius, InnerRadius )
    self:F2( { OuterRadius, InnerRadius } )

    local Theta = 2 * math.pi * math.random()
    local Radials = math.random() + math.random()
    if Radials > 1 then
      Radials = 2 - Radials
    end

    local RadialMultiplier
    if InnerRadius and InnerRadius <= OuterRadius then
      RadialMultiplier = ( OuterRadius - InnerRadius ) * Radials + InnerRadius
    else
      RadialMultiplier = OuterRadius * Radials
    end

    local RandomVec2
    if OuterRadius > 0 then
      RandomVec2 = { x = math.cos( Theta ) * RadialMultiplier + self.x, y = math.sin( Theta ) * RadialMultiplier + self.z }
    else
      RandomVec2 = { x = self.x, y = self.z }
    end

    return RandomVec2
  end


  --- Return a random Coordinate within an Outer Radius and optionally NOT within an Inner Radius of the COORDINATE.
  -- @param #COORDINATE self
  -- @param DCS#Distance OuterRadius
  -- @param DCS#Distance InnerRadius
  -- @return #COORDINATE
  function COORDINATE:GetRandomCoordinateInRadius( OuterRadius, InnerRadius )
    self:F2( { OuterRadius, InnerRadius } )

    return COORDINATE:NewFromVec2( self:GetRandomVec2InRadius( OuterRadius, InnerRadius ) )
  end


  --- Return a random Vec3 within an Outer Radius and optionally NOT within an Inner Radius of the COORDINATE.
  -- @param #COORDINATE self
  -- @param DCS#Distance OuterRadius
  -- @param DCS#Distance InnerRadius
  -- @return DCS#Vec3 Vec3
  function COORDINATE:GetRandomVec3InRadius( OuterRadius, InnerRadius )

    local RandomVec2 = self:GetRandomVec2InRadius( OuterRadius, InnerRadius )
    local y = self.y + math.random( InnerRadius, OuterRadius )
    local RandomVec3 = { x = RandomVec2.x, y = y, z = RandomVec2.y }

    return RandomVec3
  end
  
  --- Return the height of the land at the coordinate.
  -- @param #COORDINATE self
  -- @return #number
  function COORDINATE:GetLandHeight()
    local Vec2 = { x = self.x, y = self.z }
    return land.getHeight( Vec2 )
  end


  --- Set the heading of the coordinate, if applicable.
  -- @param #COORDINATE self
  function COORDINATE:SetHeading( Heading )
    self.Heading = Heading
  end
  
  
  --- Get the heading of the coordinate, if applicable.
  -- @param #COORDINATE self
  -- @return #number or nil
  function COORDINATE:GetHeading()
    return self.Heading
  end

  
  --- Set the velocity of the COORDINATE.
  -- @param #COORDINATE self
  -- @param #string Velocity Velocity in meters per second.
  function COORDINATE:SetVelocity( Velocity )
    self.Velocity = Velocity
  end

  
  --- Return the velocity of the COORDINATE.
  -- @param #COORDINATE self
  -- @return #number Velocity in meters per second.
  function COORDINATE:GetVelocity()
    local Velocity = self.Velocity
    return Velocity or 0
  end

  
  --- Return velocity text of the COORDINATE.
  -- @param #COORDINATE self
  -- @return #string
  function COORDINATE:GetMovingText( Settings )

    return self:GetVelocityText( Settings ) .. ", " .. self:GetHeadingText( Settings )
  end


  --- Return a direction vector Vec3 from COORDINATE to the COORDINATE.
  -- @param #COORDINATE self
  -- @param #COORDINATE TargetCoordinate The target COORDINATE.
  -- @return DCS#Vec3 DirectionVec3 The direction vector in Vec3 format.
  function COORDINATE:GetDirectionVec3( TargetCoordinate )
    return { x = TargetCoordinate.x - self.x, y = TargetCoordinate.y - self.y, z = TargetCoordinate.z - self.z }
  end


  --- Get a correction in radians of the real magnetic north of the COORDINATE.
  -- @param #COORDINATE self
  -- @return #number CorrectionRadians The correction in radians.
  function COORDINATE:GetNorthCorrectionRadians()
    local TargetVec3 = self:GetVec3()
    local lat, lon = coord.LOtoLL(TargetVec3)
    local north_posit = coord.LLtoLO(lat + 1, lon)
    return math.atan2( north_posit.z - TargetVec3.z, north_posit.x - TargetVec3.x )
  end


  --- Return an angle in radians from the COORDINATE using a direction vector in Vec3 format.
  -- @param #COORDINATE self
  -- @param DCS#Vec3 DirectionVec3 The direction vector in Vec3 format.
  -- @return #number DirectionRadians The angle in radians.
  function COORDINATE:GetAngleRadians( DirectionVec3 )
    local DirectionRadians = math.atan2( DirectionVec3.z, DirectionVec3.x )
    --DirectionRadians = DirectionRadians + self:GetNorthCorrectionRadians()
    if DirectionRadians < 0 then
      DirectionRadians = DirectionRadians + 2 * math.pi  -- put dir in range of 0 to 2*pi ( the full circle )
    end
    return DirectionRadians
  end

  --- Return an angle in degrees from the COORDINATE using a direction vector in Vec3 format.
  -- @param #COORDINATE self
  -- @param DCS#Vec3 DirectionVec3 The direction vector in Vec3 format.
  -- @return #number DirectionRadians The angle in degrees.
  function COORDINATE:GetAngleDegrees( DirectionVec3 )
    local AngleRadians = self:GetAngleRadians( DirectionVec3 )
    local Angle = UTILS.ToDegree( AngleRadians )
    return Angle
  end


  --- Return the 2D distance in meters between the target COORDINATE and the COORDINATE.
  -- @param #COORDINATE self
  -- @param #COORDINATE TargetCoordinate The target COORDINATE.
  -- @return DCS#Distance Distance The distance in meters.
  function COORDINATE:Get2DDistance( TargetCoordinate )
    local TargetVec3 = TargetCoordinate:GetVec3()
    local SourceVec3 = self:GetVec3()
    return ( ( TargetVec3.x - SourceVec3.x ) ^ 2 + ( TargetVec3.z - SourceVec3.z ) ^ 2 ) ^ 0.5
  end
  
  --- Returns the temperature in Degrees Celsius.
  -- @param #COORDINATE self
  -- @param height (Optional) parameter specifying the height ASL.
  -- @return Temperature in Degrees Celsius.
  function COORDINATE:GetTemperature(height)
    self:F2(height)
    local y=height or self.y
    local point={x=self.x, y=height or self.y, z=self.z}
    -- get temperature [K] and pressure [Pa] at point
    local T,P=atmosphere.getTemperatureAndPressure(point)
    -- Return Temperature in Deg C
    return T-273.15
  end

  --- Returns a text of the temperature according the measurement system @{Settings}.
  -- The text will reflect the temperature like this:
  -- 
  --   - For Russian and European aircraft using the metric system - Degrees Celcius (°C)
  --   - For Americain aircraft we link to the imperial system - Degrees Farenheit (°F)
  -- 
  -- A text containing a pressure will look like this: 
  -- 
  --   - `Temperature: %n.d °C`  
  --   - `Temperature: %n.d °F`
  --   
   -- @param #COORDINATE self
  -- @param height (Optional) parameter specifying the height ASL.
  -- @return #string Temperature according the measurement system @{Settings}.
  function COORDINATE:GetTemperatureText( height, Settings )
  
    local DegreesCelcius = self:GetTemperature( height )
    
    local Settings = Settings or _SETTINGS

    if DegreesCelcius then
      if Settings:IsMetric() then
        return string.format( " %-2.2f °C", DegreesCelcius )
      else
        return string.format( " %-2.2f °F", UTILS.CelciusToFarenheit( DegreesCelcius ) )
      end
    else
      return " no temperature"
    end
    
    return nil
  end


  --- Returns the pressure in hPa.
  -- @param #COORDINATE self
  -- @param height (Optional) parameter specifying the height ASL. E.g. set height=0 for QNH.
  -- @return Pressure in hPa.
  function COORDINATE:GetPressure(height)
    local point={x=self.x, y=height or self.y, z=self.z}
    -- get temperature [K] and pressure [Pa] at point
    local T,P=atmosphere.getTemperatureAndPressure(point)
    -- Return Pressure in hPa.
    return P/100
  end
  
  --- Returns a text of the pressure according the measurement system @{Settings}.
  -- The text will contain always the pressure in hPa and:
  -- 
  --   - For Russian and European aircraft using the metric system - hPa and mmHg
  --   - For Americain and European aircraft we link to the imperial system - hPa and inHg
  -- 
  -- A text containing a pressure will look like this: 
  -- 
  --   - `QFE: x hPa (y mmHg)`  
  --   - `QFE: x hPa (y inHg)`
  -- 
  -- @param #COORDINATE self
  -- @param height (Optional) parameter specifying the height ASL. E.g. set height=0 for QNH.
  -- @return #string Pressure in hPa and mmHg or inHg depending on the measurement system @{Settings}.
  function COORDINATE:GetPressureText( height, Settings )

    local Pressure_hPa = self:GetPressure( height )
    local Pressure_mmHg = Pressure_hPa * 0.7500615613030
    local Pressure_inHg = Pressure_hPa * 0.0295299830714
    
    local Settings = Settings or _SETTINGS

    if Pressure_hPa then
      if Settings:IsMetric() then
        return string.format( " %4.1f hPa (%3.1f mmHg)", Pressure_hPa, Pressure_mmHg )
      else
        return string.format( " %4.1f hPa (%3.2f inHg)", Pressure_hPa, Pressure_inHg )
      end
    else
      return " no pressure"
    end
    
    return nil
  end
  
  --- Returns the wind direction (from) and strength.
  -- @param #COORDINATE self
  -- @param height (Optional) parameter specifying the height ASL. The minimum height will be always be the land height since the wind is zero below the ground.
  -- @return Direction the wind is blowing from in degrees.
  -- @return Wind strength in m/s.
  function COORDINATE:GetWind(height)
    local landheight=self:GetLandHeight()+0.1 -- we at 0.1 meters to be sure to be above ground since wind is zero below ground level.
    local point={x=self.x, y=math.max(height or self.y, landheight), z=self.z}
    -- get wind velocity vector
    local wind = atmosphere.getWind(point)    
    local direction = math.deg(math.atan2(wind.z, wind.x))
    if direction < 0 then
      direction = 360 + direction
    end
    -- Convert to direction to from direction 
    if direction > 180 then
      direction = direction-180
    else
      direction = direction+180
    end
    local strength=math.sqrt((wind.x)^2+(wind.z)^2)
    -- Return wind direction and strength km/h.
    return direction, strength
  end


  --- Returns a text documenting the wind direction (from) and strength according the measurement system @{Settings}.
  -- The text will reflect the wind like this:
  -- 
  --   - For Russian and European aircraft using the metric system - Wind direction in degrees (°) and wind speed in meters per second (mps).
  --   - For Americain aircraft we link to the imperial system - Wind direction in degrees (°) and wind speed in knots per second (kps).
  -- 
  -- A text containing a pressure will look like this: 
  -- 
  --   - `Wind: %n ° at n.d mps`  
  --   - `Wind: %n ° at n.d kps`
  --   
  -- @param #COORDINATE self
  -- @param height (Optional) parameter specifying the height ASL. The minimum height will be always be the land height since the wind is zero below the ground.
  -- @return #string Wind direction and strength according the measurement system @{Settings}.
  function COORDINATE:GetWindText( height, Settings )

    local Direction, Strength = self:GetWind( height )

    local Settings = Settings or _SETTINGS

    if Direction and Strength then
      if Settings:IsMetric() then
        return string.format( " %d ° at %3.2f mps", Direction, UTILS.MpsToKmph( Strength ) )
      else
        return string.format( " %d ° at %3.2f kps", Direction, UTILS.MpsToKnots( Strength ) )
      end
    else
      return " no wind"
    end
    
    return nil
  end

  --- Return the 3D distance in meters between the target COORDINATE and the COORDINATE.
  -- @param #COORDINATE self
  -- @param #COORDINATE TargetCoordinate The target COORDINATE.
  -- @return DCS#Distance Distance The distance in meters.
  function COORDINATE:Get3DDistance( TargetCoordinate )
    local TargetVec3 = TargetCoordinate:GetVec3()
    local SourceVec3 = self:GetVec3()
    return ( ( TargetVec3.x - SourceVec3.x ) ^ 2 + ( TargetVec3.y - SourceVec3.y ) ^ 2 + ( TargetVec3.z - SourceVec3.z ) ^ 2 ) ^ 0.5
  end


  --- Provides a bearing text in degrees.
  -- @param #COORDINATE self
  -- @param #number AngleRadians The angle in randians.
  -- @param #number Precision The precision.
  -- @param Core.Settings#SETTINGS Settings
  -- @return #string The bearing text in degrees.
  function COORDINATE:GetBearingText( AngleRadians, Precision, Settings )

    local Settings = Settings or _SETTINGS -- Core.Settings#SETTINGS

    local AngleDegrees = UTILS.Round( UTILS.ToDegree( AngleRadians ), Precision )
  
    local s = string.format( '%03d°', AngleDegrees ) 
    
    return s
  end

  --- Provides a distance text expressed in the units of measurement.
  -- @param #COORDINATE self
  -- @param #number Distance The distance in meters.
  -- @param Core.Settings#SETTINGS Settings
  -- @return #string The distance text expressed in the units of measurement.
  function COORDINATE:GetDistanceText( Distance, Settings )

    local Settings = Settings or _SETTINGS -- Core.Settings#SETTINGS

    local DistanceText

    if Settings:IsMetric() then
      DistanceText = " for " .. UTILS.Round( Distance / 1000, 2 ) .. " km"
    else
      DistanceText = " for " .. UTILS.Round( UTILS.MetersToNM( Distance ), 2 ) .. " miles"
    end
    
    return DistanceText
  end

  --- Return the altitude text of the COORDINATE.
  -- @param #COORDINATE self
  -- @return #string Altitude text.
  function COORDINATE:GetAltitudeText( Settings )
    local Altitude = self.y
    local Settings = Settings or _SETTINGS
    if Altitude ~= 0 then
      if Settings:IsMetric() then
        return " at " .. UTILS.Round( self.y, -3 ) .. " meters"
      else
        return " at " .. UTILS.Round( UTILS.MetersToFeet( self.y ), -3 ) .. " feet"
      end
    else
      return ""
    end
  end



  --- Return the velocity text of the COORDINATE.
  -- @param #COORDINATE self
  -- @return #string Velocity text.
  function COORDINATE:GetVelocityText( Settings )
    local Velocity = self:GetVelocity()
    local Settings = Settings or _SETTINGS
    if Velocity then
      if Settings:IsMetric() then
        return string.format( " moving at %d km/h", UTILS.MpsToKmph( Velocity ) )
      else
        return string.format( " moving at %d mi/h", UTILS.MpsToKmph( Velocity ) / 1.852 )
      end
    else
      return " stationary"
    end
  end


  --- Return the heading text of the COORDINATE.
  -- @param #COORDINATE self
  -- @return #string Heading text.
  function COORDINATE:GetHeadingText( Settings )
    local Heading = self:GetHeading()
    if Heading then
      return string.format( " bearing %3d°", Heading )
    else
      return " bearing unknown"
    end
  end


  --- Provides a Bearing / Range string
  -- @param #COORDINATE self
  -- @param #number AngleRadians The angle in randians
  -- @param #number Distance The distance
  -- @param Core.Settings#SETTINGS Settings
  -- @return #string The BR Text
  function COORDINATE:GetBRText( AngleRadians, Distance, Settings )

    local Settings = Settings or _SETTINGS -- Core.Settings#SETTINGS

    local BearingText = self:GetBearingText( AngleRadians, 0, Settings )
    local DistanceText = self:GetDistanceText( Distance, Settings )
    
    local BRText = BearingText .. DistanceText

    return BRText
  end

  --- Provides a Bearing / Range / Altitude string
  -- @param #COORDINATE self
  -- @param #number AngleRadians The angle in randians
  -- @param #number Distance The distance
  -- @param Core.Settings#SETTINGS Settings
  -- @return #string The BRA Text
  function COORDINATE:GetBRAText( AngleRadians, Distance, Settings )

    local Settings = Settings or _SETTINGS -- Core.Settings#SETTINGS

    local BearingText = self:GetBearingText( AngleRadians, 0, Settings )
    local DistanceText = self:GetDistanceText( Distance, Settings )
    local AltitudeText = self:GetAltitudeText( Settings )

    local BRAText = BearingText .. DistanceText .. AltitudeText -- When the POINT is a VEC2, there will be no altitude shown.

    return BRAText
  end



  --- Add a Distance in meters from the COORDINATE horizontal plane, with the given angle, and calculate the new COORDINATE.
  -- @param #COORDINATE self
  -- @param DCS#Distance Distance The Distance to be added in meters.
  -- @param DCS#Angle Angle The Angle in degrees.
  -- @return #COORDINATE The new calculated COORDINATE.
  function COORDINATE:Translate( Distance, Angle )
    local SX = self.x
    local SZ = self.z
    local Radians = Angle / 180 * math.pi
    local TX = Distance * math.cos( Radians ) + SX
    local TZ = Distance * math.sin( Radians ) + SZ

    return COORDINATE:New( TX, self.y, TZ )
  end



  --- Build an air type route point.
  -- @param #COORDINATE self
  -- @param #COORDINATE.WaypointAltType AltType The altitude type.
  -- @param #COORDINATE.WaypointType Type The route point type.
  -- @param #COORDINATE.WaypointAction Action The route point action.
  -- @param DCS#Speed Speed Airspeed in km/h. Default is 500 km/h.
  -- @param #boolean SpeedLocked true means the speed is locked.
  -- @return #table The route point.
  function COORDINATE:WaypointAir( AltType, Type, Action, Speed, SpeedLocked )
    self:F2( { AltType, Type, Action, Speed, SpeedLocked } )

    local RoutePoint = {}
    RoutePoint.x = self.x
    RoutePoint.y = self.z
    RoutePoint.alt = self.y
    RoutePoint.alt_type = AltType or "RADIO"

    RoutePoint.type = Type or nil
    RoutePoint.action = Action or nil

    RoutePoint.speed = ( Speed and Speed / 3.6 ) or ( 500 / 3.6 )
    RoutePoint.speed_locked = true

    --  ["task"] =
    --  {
    --      ["id"] = "ComboTask",
    --      ["params"] =
    --      {
    --          ["tasks"] =
    --          {
    --          }, -- end of ["tasks"]
    --      }, -- end of ["params"]
    --  }, -- end of ["task"]


    RoutePoint.task = {}
    RoutePoint.task.id = "ComboTask"
    RoutePoint.task.params = {}
    RoutePoint.task.params.tasks = {}


    return RoutePoint
  end


  --- Build a Waypoint Air "Turning Point".
  -- @param #COORDINATE self
  -- @param #COORDINATE.WaypointAltType AltType The altitude type.
  -- @param DCS#Speed Speed Airspeed in km/h.
  -- @return #table The route point.
  function COORDINATE:WaypointAirTurningPoint( AltType, Speed )
    return self:WaypointAir( AltType, COORDINATE.WaypointType.TurningPoint, COORDINATE.WaypointAction.TurningPoint, Speed )
  end

  
  --- Build a Waypoint Air "Fly Over Point".
  -- @param #COORDINATE self
  -- @param #COORDINATE.WaypointAltType AltType The altitude type.
  -- @param DCS#Speed Speed Airspeed in km/h.
  -- @return #table The route point.
  function COORDINATE:WaypointAirFlyOverPoint( AltType, Speed )
    return self:WaypointAir( AltType, COORDINATE.WaypointType.TurningPoint, COORDINATE.WaypointAction.FlyoverPoint, Speed )
  end
  
  
  --- Build a Waypoint Air "Take Off Parking Hot".
  -- @param #COORDINATE self
  -- @param #COORDINATE.WaypointAltType AltType The altitude type.
  -- @param DCS#Speed Speed Airspeed in km/h.
  -- @return #table The route point.
  function COORDINATE:WaypointAirTakeOffParkingHot( AltType, Speed )
    return self:WaypointAir( AltType, COORDINATE.WaypointType.TakeOffParkingHot, COORDINATE.WaypointAction.FromParkingAreaHot, Speed )
  end
  

  --- Build a Waypoint Air "Take Off Parking".
  -- @param #COORDINATE self
  -- @param #COORDINATE.WaypointAltType AltType The altitude type.
  -- @param DCS#Speed Speed Airspeed in km/h.
  -- @return #table The route point.
  function COORDINATE:WaypointAirTakeOffParking( AltType, Speed )
    return self:WaypointAir( AltType, COORDINATE.WaypointType.TakeOffParking, COORDINATE.WaypointAction.FromParkingArea, Speed )
  end
  
  
  --- Build a Waypoint Air "Take Off Runway".
  -- @param #COORDINATE self
  -- @param #COORDINATE.WaypointAltType AltType The altitude type.
  -- @param DCS#Speed Speed Airspeed in km/h.
  -- @return #table The route point.
  function COORDINATE:WaypointAirTakeOffRunway( AltType, Speed )
    return self:WaypointAir( AltType, COORDINATE.WaypointType.TakeOff, COORDINATE.WaypointAction.FromRunway, Speed )
  end
  
  
  --- Build a Waypoint Air "Landing".
  -- @param #COORDINATE self
  -- @param DCS#Speed Speed Airspeed in km/h.
  -- @return #table The route point.
  -- @usage
  -- 
  --    LandingZone = ZONE:New( "LandingZone" )
  --    LandingCoord = LandingZone:GetCoordinate()
  --    LandingWaypoint = LandingCoord:WaypointAirLanding( 60 )
  --    HeliGroup:Route( { LandWaypoint }, 1 ) -- Start landing the helicopter in one second.
  -- 
  function COORDINATE:WaypointAirLanding( Speed )
    return self:WaypointAir( nil, COORDINATE.WaypointType.Land, COORDINATE.WaypointAction.Landing, Speed )
  end
  
  
  
  
  --- Build an ground type route point.
  -- @param #COORDINATE self
  -- @param #number Speed (optional) Speed in km/h. The default speed is 20 km/h.
  -- @param #string Formation (optional) The route point Formation, which is a text string that specifies exactly the Text in the Type of the route point, like "Vee", "Echelon Right".
  -- @return #table The route point.
  function COORDINATE:WaypointGround( Speed, Formation )
    self:F2( { Formation, Speed } )

 
    local RoutePoint = {}
    RoutePoint.x = self.x
    RoutePoint.y = self.z

    RoutePoint.action = Formation or ""
    --RoutePoint.formation_template = Formation and "" or nil


    RoutePoint.speed = ( Speed or 20 ) / 3.6
    RoutePoint.speed_locked = true

    --  ["task"] =
    --  {
    --      ["id"] = "ComboTask",
    --      ["params"] =
    --      {
    --          ["tasks"] =
    --          {
    --          }, -- end of ["tasks"]
    --      }, -- end of ["params"]
    --  }, -- end of ["task"]


    RoutePoint.task = {}
    RoutePoint.task.id = "ComboTask"
    RoutePoint.task.params = {}
    RoutePoint.task.params.tasks = {}


    return RoutePoint
  end
  
  --- Gets the nearest coordinate to a road.
  -- @param #COORDINATE self
  -- @return #COORDINATE Coordinate of the nearest road.
  function COORDINATE:GetClosestPointToRoad()
   local x,y = land.getClosestPointOnRoads("roads", self.x, self.z)
   local vec2={ x = x, y = y }
   return COORDINATE:NewFromVec2(vec2)
  end

  --- Returns a table of coordinates to a destination using only roads.
  -- The first point is the closest point on road of the given coordinate. The last point is the closest point on road of the ToCoord. Hence, the coordinate itself and the final ToCoord are not necessarily included in the path.
  -- @param #COORDINATE self
  -- @param #COORDINATE ToCoord Coordinate of destination.
  -- @return #table Table of coordinates on road. If no path on road can be found, nil is returned.
  function COORDINATE:GetPathOnRoad(ToCoord)

    -- DCS API function returning a table of vec2.
    local path = land.findPathOnRoads("roads", self.x, self.z, ToCoord.x, ToCoord.z)
    
    local Path={}
    
    if path then
      --Path[#Path+1]=self
      for i, v in ipairs(path) do
        Path[#Path+1]=COORDINATE:NewFromVec2(v)
      end
      --Path[#Path+1]=ToCoord
    else
      -- There are cases where no path on road can be found.
      return nil
    end
        
    return Path
  end

  --- Gets the surface type at the coordinate.
  -- @param #COORDINATE self
  -- @return DCS#SurfaceType Surface type.
  function COORDINATE:GetSurfaceType()
    local vec2=self:GetVec2()
    local surface=land.getSurfaceType(vec2)
    return surface
  end

  --- Creates an explosion at the point of a certain intensity.
  -- @param #COORDINATE self
  -- @param #number ExplosionIntensity
  function COORDINATE:Explosion( ExplosionIntensity )
    self:F2( { ExplosionIntensity } )
    trigger.action.explosion( self:GetVec3(), ExplosionIntensity )
  end

  --- Creates an illumination bomb at the point.
  -- @param #COORDINATE self
  function COORDINATE:IlluminationBomb()
    self:F2()
    trigger.action.illuminationBomb( self:GetVec3() )
  end


  --- Smokes the point in a color.
  -- @param #COORDINATE self
  -- @param Utilities.Utils#SMOKECOLOR SmokeColor
  function COORDINATE:Smoke( SmokeColor )
    self:F2( { SmokeColor } )
    trigger.action.smoke( self:GetVec3(), SmokeColor )
  end

  --- Smoke the COORDINATE Green.
  -- @param #COORDINATE self
  function COORDINATE:SmokeGreen()
    self:F2()
    self:Smoke( SMOKECOLOR.Green )
  end

  --- Smoke the COORDINATE Red.
  -- @param #COORDINATE self
  function COORDINATE:SmokeRed()
    self:F2()
    self:Smoke( SMOKECOLOR.Red )
  end

  --- Smoke the COORDINATE White.
  -- @param #COORDINATE self
  function COORDINATE:SmokeWhite()
    self:F2()
    self:Smoke( SMOKECOLOR.White )
  end

  --- Smoke the COORDINATE Orange.
  -- @param #COORDINATE self
  function COORDINATE:SmokeOrange()
    self:F2()
    self:Smoke( SMOKECOLOR.Orange )
  end

  --- Smoke the COORDINATE Blue.
  -- @param #COORDINATE self
  function COORDINATE:SmokeBlue()
    self:F2()
    self:Smoke( SMOKECOLOR.Blue )
  end

  --- Big smoke and fire at the coordinate.
  -- @param #COORDINATE self
  -- @param Utilities.Utils#BIGSMOKEPRESET preset Smoke preset (0=small smoke and fire, 1=medium smoke and fire, 2=large smoke and fire, 3=huge smoke and fire, 4=small smoke, 5=medium smoke, 6=large smoke, 7=huge smoke).
  -- @param #number density (Optional) Smoke density. Number in [0,...,1]. Default 0.5.
  function COORDINATE:BigSmokeAndFire( preset, density )
    self:F2( { preset=preset, density=density } )
    density=density or 0.5
    trigger.action.effectSmokeBig( self:GetVec3(), preset, density )
  end

  --- Small smoke and fire at the coordinate.
  -- @param #COORDINATE self
  -- @number density (Optional) Smoke density. Number between 0 and 1. Default 0.5.
  function COORDINATE:BigSmokeAndFireSmall( density )
    self:F2( { density=density } )
    density=density or 0.5
    self:BigSmokeAndFire(BIGSMOKEPRESET.SmallSmokeAndFire, density)
  end

  --- Medium smoke and fire at the coordinate.
  -- @param #COORDINATE self
  -- @number density (Optional) Smoke density. Number between 0 and 1. Default 0.5.
  function COORDINATE:BigSmokeAndFireMedium( density )
    self:F2( { density=density } )
    density=density or 0.5
    self:BigSmokeAndFire(BIGSMOKEPRESET.MediumSmokeAndFire, density)
  end
  
  --- Large smoke and fire at the coordinate.
  -- @param #COORDINATE self
  -- @number density (Optional) Smoke density. Number between 0 and 1. Default 0.5.
  function COORDINATE:BigSmokeAndFireLarge( density )
    self:F2( { density=density } )
    density=density or 0.5
    self:BigSmokeAndFire(BIGSMOKEPRESET.LargeSmokeAndFire, density)
  end

  --- Huge smoke and fire at the coordinate.
  -- @param #COORDINATE self
  -- @number density (Optional) Smoke density. Number between 0 and 1. Default 0.5.
  function COORDINATE:BigSmokeAndFireHuge( density )
    self:F2( { density=density } )
    density=density or 0.5
    self:BigSmokeAndFire(BIGSMOKEPRESET.HugeSmokeAndFire, density)
  end
  
  --- Small smoke at the coordinate.
  -- @param #COORDINATE self
  -- @number density (Optional) Smoke density. Number between 0 and 1. Default 0.5.
  function COORDINATE:BigSmokeSmall( density )
    self:F2( { density=density } )
    density=density or 0.5
    self:BigSmokeAndFire(BIGSMOKEPRESET.SmallSmoke, density)
  end
  
  --- Medium smoke at the coordinate.
  -- @param #COORDINATE self
  -- @number density (Optional) Smoke density. Number between 0 and 1. Default 0.5.
  function COORDINATE:BigSmokeMedium( density )
    self:F2( { density=density } )
    density=density or 0.5
    self:BigSmokeAndFire(BIGSMOKEPRESET.MediumSmoke, density)
  end

  --- Large smoke at the coordinate.
  -- @param #COORDINATE self
  -- @number density (Optional) Smoke density. Number between 0 and 1. Default 0.5.
  function COORDINATE:BigSmokeLarge( density )
    self:F2( { density=density } )
    density=density or 0.5
    self:BigSmokeAndFire(BIGSMOKEPRESET.LargeSmoke, density)
  end
  
  --- Huge smoke at the coordinate.
  -- @param #COORDINATE self
  -- @number density (Optional) Smoke density. Number between 0 and 1. Default 0.5.
  function COORDINATE:BigSmokeHuge( density )
    self:F2( { density=density } )
    density=density or 0.5
    self:BigSmokeAndFire(BIGSMOKEPRESET.HugeSmoke, density)
  end  

  --- Flares the point in a color.
  -- @param #COORDINATE self
  -- @param Utilities.Utils#FLARECOLOR FlareColor
  -- @param DCS#Azimuth (optional) Azimuth The azimuth of the flare direction. The default azimuth is 0.
  function COORDINATE:Flare( FlareColor, Azimuth )
    self:F2( { FlareColor } )
    trigger.action.signalFlare( self:GetVec3(), FlareColor, Azimuth and Azimuth or 0 )
  end

  --- Flare the COORDINATE White.
  -- @param #COORDINATE self
  -- @param DCS#Azimuth (optional) Azimuth The azimuth of the flare direction. The default azimuth is 0.
  function COORDINATE:FlareWhite( Azimuth )
    self:F2( Azimuth )
    self:Flare( FLARECOLOR.White, Azimuth )
  end

  --- Flare the COORDINATE Yellow.
  -- @param #COORDINATE self
  -- @param DCS#Azimuth (optional) Azimuth The azimuth of the flare direction. The default azimuth is 0.
  function COORDINATE:FlareYellow( Azimuth )
    self:F2( Azimuth )
    self:Flare( FLARECOLOR.Yellow, Azimuth )
  end

  --- Flare the COORDINATE Green.
  -- @param #COORDINATE self
  -- @param DCS#Azimuth (optional) Azimuth The azimuth of the flare direction. The default azimuth is 0.
  function COORDINATE:FlareGreen( Azimuth )
    self:F2( Azimuth )
    self:Flare( FLARECOLOR.Green, Azimuth )
  end

  --- Flare the COORDINATE Red.
  -- @param #COORDINATE self
  function COORDINATE:FlareRed( Azimuth )
    self:F2( Azimuth )
    self:Flare( FLARECOLOR.Red, Azimuth )
  end
  
  do -- Markings
  
    --- Mark to All
    -- @param #COORDINATE self
    -- @param #string MarkText Free format text that shows the marking clarification.
    -- @param #boolean ReadOnly (Optional) Mark is readonly and cannot be removed by users. Default false.
    -- @param #string Text (Optional) Text displayed when mark is added. Default none.
    -- @return #number The resulting Mark ID which is a number.
    -- @usage
    --   local TargetCoord = TargetGroup:GetCoordinate()
    --   local MarkID = TargetCoord:MarkToAll( "This is a target for all players" )
    function COORDINATE:MarkToAll( MarkText, ReadOnly, Text )
      local MarkID = UTILS.GetMarkID()
      if ReadOnly==nil then
        ReadOnly=false
      end
      local text=Text or ""
      trigger.action.markToAll( MarkID, MarkText, self:GetVec3(), ReadOnly, text)
      return MarkID
    end

    --- Mark to Coalition
    -- @param #COORDINATE self
    -- @param #string MarkText Free format text that shows the marking clarification.
    -- @param Coalition
    -- @param #boolean ReadOnly (Optional) Mark is readonly and cannot be removed by users. Default false.
    -- @param #string Text (Optional) Text displayed when mark is added. Default none.
    -- @return #number The resulting Mark ID which is a number.
    -- @usage
    --   local TargetCoord = TargetGroup:GetCoordinate()
    --   local MarkID = TargetCoord:MarkToCoalition( "This is a target for the red coalition", coalition.side.RED )
    function COORDINATE:MarkToCoalition( MarkText, Coalition, ReadOnly, Text )
      local MarkID = UTILS.GetMarkID()
      if ReadOnly==nil then
        ReadOnly=false
      end
      local text=Text or ""
      trigger.action.markToCoalition( MarkID, MarkText, self:GetVec3(), Coalition, ReadOnly, text )
      return MarkID
    end

    --- Mark to Red Coalition
    -- @param #COORDINATE self
    -- @param #string MarkText Free format text that shows the marking clarification.
    -- @param #boolean ReadOnly (Optional) Mark is readonly and cannot be removed by users. Default false.
    -- @param #string Text (Optional) Text displayed when mark is added. Default none.
    -- @return #number The resulting Mark ID which is a number.
    -- @usage
    --   local TargetCoord = TargetGroup:GetCoordinate()
    --   local MarkID = TargetCoord:MarkToCoalitionRed( "This is a target for the red coalition" )
    function COORDINATE:MarkToCoalitionRed( MarkText, ReadOnly, Text )
      return self:MarkToCoalition( MarkText, coalition.side.RED, ReadOnly, Text )
    end

    --- Mark to Blue Coalition
    -- @param #COORDINATE self
    -- @param #string MarkText Free format text that shows the marking clarification.
    -- @param #boolean ReadOnly (Optional) Mark is readonly and cannot be removed by users. Default false.
    -- @param #string Text (Optional) Text displayed when mark is added. Default none.
    -- @return #number The resulting Mark ID which is a number.
    -- @usage
    --   local TargetCoord = TargetGroup:GetCoordinate()
    --   local MarkID = TargetCoord:MarkToCoalitionBlue( "This is a target for the blue coalition" )
    function COORDINATE:MarkToCoalitionBlue( MarkText, ReadOnly, Text )
      return self:MarkToCoalition( MarkText, coalition.side.BLUE, ReadOnly, Text )
    end

    --- Mark to Group
    -- @param #COORDINATE self
    -- @param #string MarkText Free format text that shows the marking clarification.
    -- @param Wrapper.Group#GROUP MarkGroup The @{Wrapper.Group} that receives the mark.
    -- @param #boolean ReadOnly (Optional) Mark is readonly and cannot be removed by users. Default false.
    -- @param #string Text (Optional) Text displayed when mark is added. Default none.
    -- @return #number The resulting Mark ID which is a number.
    -- @usage
    --   local TargetCoord = TargetGroup:GetCoordinate()
    --   local MarkGroup = GROUP:FindByName( "AttackGroup" )
    --   local MarkID = TargetCoord:MarkToGroup( "This is a target for the attack group", AttackGroup )
    function COORDINATE:MarkToGroup( MarkText, MarkGroup, ReadOnly, Text )
      local MarkID = UTILS.GetMarkID()
      if ReadOnly==nil then
        ReadOnly=false
      end
      local text=Text or ""
      trigger.action.markToGroup( MarkID, MarkText, self:GetVec3(), MarkGroup:GetID(), ReadOnly, text )
      return MarkID
    end
    
    --- Remove a mark
    -- @param #COORDINATE self
    -- @param #number MarkID The ID of the mark to be removed.
    -- @usage
    --   local TargetCoord = TargetGroup:GetCoordinate()
    --   local MarkGroup = GROUP:FindByName( "AttackGroup" )
    --   local MarkID = TargetCoord:MarkToGroup( "This is a target for the attack group", AttackGroup )
    --   <<< logic >>>
    --   RemoveMark( MarkID ) -- The mark is now removed
    function COORDINATE:RemoveMark( MarkID )
      trigger.action.removeMark( MarkID )
    end
  
  end -- Markings
  

  --- Returns if a Coordinate has Line of Sight (LOS) with the ToCoordinate.
  -- @param #COORDINATE self
  -- @param #COORDINATE ToCoordinate
  -- @return #boolean true If the ToCoordinate has LOS with the Coordinate, otherwise false.
  function COORDINATE:IsLOS( ToCoordinate )

    -- Measurement of visibility should not be from the ground, so Adding a hypotethical 2 meters to each Coordinate.
    local FromVec3 = self:GetVec3()
    FromVec3.y = FromVec3.y + 2

    local ToVec3 = ToCoordinate:GetVec3()
    ToVec3.y = ToVec3.y + 2

    local IsLOS = land.isVisible( FromVec3, ToVec3 )

    return IsLOS
  end


  --- Returns if a Coordinate is in a certain Radius of this Coordinate in 2D plane using the X and Z axis.
  -- @param #COORDINATE self
  -- @param #COORDINATE ToCoordinate The coordinate that will be tested if it is in the radius of this coordinate.
  -- @param #number Radius The radius of the circle on the 2D plane around this coordinate.
  -- @return #boolean true if in the Radius.
  function COORDINATE:IsInRadius( Coordinate, Radius )

    local InVec2 = self:GetVec2()
    local Vec2 = Coordinate:GetVec2()
    
    local InRadius = UTILS.IsInRadius( InVec2, Vec2, Radius)

    return InRadius
  end


  --- Returns if a Coordinate is in a certain radius of this Coordinate in 3D space using the X, Y and Z axis.
  -- So Radius defines the radius of the a Sphere in 3D space around this coordinate.
  -- @param #COORDINATE self
  -- @param #COORDINATE ToCoordinate The coordinate that will be tested if it is in the radius of this coordinate.
  -- @param #number Radius The radius of the sphere in the 3D space around this coordinate.
  -- @return #boolean true if in the Sphere.
  function COORDINATE:IsInSphere( Coordinate, Radius )

    local InVec3 = self:GetVec3()
    local Vec3 = Coordinate:GetVec3()
    
    local InSphere = UTILS.IsInSphere( InVec3, Vec3, Radius)

    return InSphere
  end


  --- Return a BR string from a COORDINATE to the COORDINATE.
  -- @param #COORDINATE self
  -- @param #COORDINATE TargetCoordinate The target COORDINATE.
  -- @return #string The BR text.
  function COORDINATE:ToStringBR( FromCoordinate, Settings )
    local DirectionVec3 = FromCoordinate:GetDirectionVec3( self )
    local AngleRadians =  self:GetAngleRadians( DirectionVec3 )
    local Distance = self:Get2DDistance( FromCoordinate )
    return "BR, " .. self:GetBRText( AngleRadians, Distance, Settings )
  end

  --- Return a BRAA string from a COORDINATE to the COORDINATE.
  -- @param #COORDINATE self
  -- @param #COORDINATE TargetCoordinate The target COORDINATE.
  -- @return #string The BR text.
  function COORDINATE:ToStringBRA( FromCoordinate, Settings )
    local DirectionVec3 = FromCoordinate:GetDirectionVec3( self )
    local AngleRadians =  self:GetAngleRadians( DirectionVec3 )
    local Distance = FromCoordinate:Get2DDistance( self )
    local Altitude = self:GetAltitudeText()
    return "BRA, " .. self:GetBRAText( AngleRadians, Distance, Settings )
  end

  --- Return a BULLS string out of the BULLS of the coalition to the COORDINATE.
  -- @param #COORDINATE self
  -- @param DCS#coalition.side Coalition The coalition.
  -- @return #string The BR text.
  function COORDINATE:ToStringBULLS( Coalition, Settings )
    local BullsCoordinate = COORDINATE:NewFromVec3( coalition.getMainRefPoint( Coalition ) )
    local DirectionVec3 = BullsCoordinate:GetDirectionVec3( self )
    local AngleRadians =  self:GetAngleRadians( DirectionVec3 )
    local Distance = self:Get2DDistance( BullsCoordinate )
    local Altitude = self:GetAltitudeText()
    return "BULLS, " .. self:GetBRText( AngleRadians, Distance, Settings )
  end

  --- Return an aspect string from a COORDINATE to the Angle of the object.
  -- @param #COORDINATE self
  -- @param #COORDINATE TargetCoordinate The target COORDINATE.
  -- @return #string The Aspect string, which is Hot, Cold or Flanking.
  function COORDINATE:ToStringAspect( TargetCoordinate )
    local Heading = self.Heading
    local DirectionVec3 = self:GetDirectionVec3( TargetCoordinate )
    local Angle = self:GetAngleDegrees( DirectionVec3 )
    
    if Heading then
      local Aspect = Angle - Heading
      if Aspect > -135 and Aspect <= -45 then
        return "Flanking"
      end
      if Aspect > -45 and Aspect <= 45 then
        return "Hot"
      end
      if Aspect > 45 and Aspect <= 135 then
        return "Flanking"
      end
      if Aspect > 135 or Aspect <= -135 then
        return "Cold"
      end
    end
    return ""
  end

  --- Provides a Lat Lon string in Degree Minute Second format.
  -- @param #COORDINATE self
  -- @param Core.Settings#SETTINGS Settings (optional) Settings
  -- @return #string The LL DMS Text
  function COORDINATE:ToStringLLDMS( Settings ) 

    local LL_Accuracy = Settings and Settings.LL_Accuracy or _SETTINGS.LL_Accuracy
    local lat, lon = coord.LOtoLL( self:GetVec3() )
    return "LL DMS, " .. UTILS.tostringLL( lat, lon, LL_Accuracy, true )
  end

  --- Provides a Lat Lon string in Degree Decimal Minute format.
  -- @param #COORDINATE self
  -- @param Core.Settings#SETTINGS Settings (optional) Settings
  -- @return #string The LL DDM Text
  function COORDINATE:ToStringLLDDM( Settings )

    local LL_Accuracy = Settings and Settings.LL_Accuracy or _SETTINGS.LL_Accuracy
    local lat, lon = coord.LOtoLL( self:GetVec3() )
    return "LL DDM, " .. UTILS.tostringLL( lat, lon, LL_Accuracy, false )
  end

  --- Provides a MGRS string
  -- @param #COORDINATE self
  -- @param Core.Settings#SETTINGS Settings (optional) Settings
  -- @return #string The MGRS Text
  function COORDINATE:ToStringMGRS( Settings ) --R2.1 Fixes issue #424.

    local MGRS_Accuracy = Settings and Settings.MGRS_Accuracy or _SETTINGS.MGRS_Accuracy
    local lat, lon = coord.LOtoLL( self:GetVec3() )
    local MGRS = coord.LLtoMGRS( lat, lon )
    return "MGRS, " .. UTILS.tostringMGRS( MGRS, MGRS_Accuracy )
  end

  --- Provides a coordinate string of the point, based on a coordinate format system:
  --   * Uses default settings in COORDINATE.
  --   * Can be overridden if for a GROUP containing x clients, a menu was selected to override the default.
  -- @param #COORDINATE self
  -- @param Wrapper.Controllable#CONTROLLABLE Controllable
  -- @param Core.Settings#SETTINGS Settings
  -- @return #string The coordinate Text in the configured coordinate system.
  function COORDINATE:ToStringFromRP( ReferenceCoord, ReferenceName, Controllable, Settings ) -- R2.2
  
    self:F2( { ReferenceCoord = ReferenceCoord, ReferenceName = ReferenceName } )

    local Settings = Settings or ( Controllable and _DATABASE:GetPlayerSettings( Controllable:GetPlayerName() ) ) or _SETTINGS
    
    local IsAir = Controllable and Controllable:IsAirPlane() or false

    if IsAir then
      local DirectionVec3 = ReferenceCoord:GetDirectionVec3( self )
      local AngleRadians =  self:GetAngleRadians( DirectionVec3 )
      local Distance = self:Get2DDistance( ReferenceCoord )
      return "Targets are the last seen " .. self:GetBRText( AngleRadians, Distance, Settings ) .. " from " .. ReferenceName
    else
      local DirectionVec3 = ReferenceCoord:GetDirectionVec3( self )
      local AngleRadians =  self:GetAngleRadians( DirectionVec3 )
      local Distance = self:Get2DDistance( ReferenceCoord )
      return "Target are located " .. self:GetBRText( AngleRadians, Distance, Settings ) .. " from " .. ReferenceName
    end
    
    return nil

  end

  --- Provides a coordinate string of the point, based on the A2G coordinate format system.
  -- @param #COORDINATE self
  -- @param Wrapper.Controllable#CONTROLLABLE Controllable
  -- @param Core.Settings#SETTINGS Settings
  -- @return #string The coordinate Text in the configured coordinate system.
  function COORDINATE:ToStringA2G( Controllable, Settings ) -- R2.2
  
    self:F2( { Controllable = Controllable and Controllable:GetName() } )

    local Settings = Settings or ( Controllable and _DATABASE:GetPlayerSettings( Controllable:GetPlayerName() ) ) or _SETTINGS

    if Settings:IsA2G_BR()  then
      -- If no Controllable is given to calculate the BR from, then MGRS will be used!!!
      if Controllable then
        local Coordinate = Controllable:GetCoordinate()
        return Controllable and self:ToStringBR( Coordinate, Settings ) or self:ToStringMGRS( Settings )
      else
        return self:ToStringMGRS( Settings )
      end
    end
    if Settings:IsA2G_LL_DMS()  then
      return self:ToStringLLDMS( Settings )
    end
    if Settings:IsA2G_LL_DDM()  then
      return self:ToStringLLDDM( Settings )
    end
    if Settings:IsA2G_MGRS() then
      return self:ToStringMGRS( Settings )
    end

    return nil

  end


  --- Provides a coordinate string of the point, based on the A2A coordinate format system.
  -- @param #COORDINATE self
  -- @param Wrapper.Controllable#CONTROLLABLE Controllable
  -- @param Core.Settings#SETTINGS Settings
  -- @return #string The coordinate Text in the configured coordinate system.
  function COORDINATE:ToStringA2A( Controllable, Settings ) -- R2.2
  
    self:F2( { Controllable = Controllable and Controllable:GetName() } )

    local Settings = Settings or ( Controllable and _DATABASE:GetPlayerSettings( Controllable:GetPlayerName() ) ) or _SETTINGS

    if Settings:IsA2A_BRAA()  then
      if Controllable then
        local Coordinate = Controllable:GetCoordinate()
        return self:ToStringBRA( Coordinate, Settings ) 
      else
        return self:ToStringMGRS( Settings )
      end
    end
    if Settings:IsA2A_BULLS() then
      local Coalition = Controllable:GetCoalition()
      return self:ToStringBULLS( Coalition, Settings )
    end
    if Settings:IsA2A_LL_DMS()  then
      return self:ToStringLLDMS( Settings )
    end
    if Settings:IsA2A_LL_DDM()  then
      return self:ToStringLLDDM( Settings )
    end
    if Settings:IsA2A_MGRS() then
      return self:ToStringMGRS( Settings )
    end

    return nil

  end

  --- Provides a coordinate string of the point, based on a coordinate format system:
  --   * Uses default settings in COORDINATE.
  --   * Can be overridden if for a GROUP containing x clients, a menu was selected to override the default.
  -- @param #COORDINATE self
  -- @param Wrapper.Controllable#CONTROLLABLE Controllable
  -- @param Core.Settings#SETTINGS Settings
  -- @param Tasking.Task#TASK Task The task for which coordinates need to be calculated.
  -- @return #string The coordinate Text in the configured coordinate system.
  function COORDINATE:ToString( Controllable, Settings, Task ) -- R2.2
  
    self:F2( { Controllable = Controllable and Controllable:GetName() } )

    local Settings = Settings or ( Controllable and _DATABASE:GetPlayerSettings( Controllable:GetPlayerName() ) ) or _SETTINGS

    local ModeA2A = false
    
    if Task then
      if Task:IsInstanceOf( TASK_A2A ) then
        ModeA2A = true
      else
        if Task:IsInstanceOf( TASK_A2G ) then
          ModeA2A = false
        else
          if Task:IsInstanceOf( TASK_CARGO ) then
            ModeA2A = false
          else
            ModeA2A = false
          end
        end
      end
    else
      local IsAir = Controllable and Controllable:IsAirPlane() or false
      if IsAir  then
        ModeA2A = true
      else
        ModeA2A = false
      end
    end
    

    if ModeA2A == true then
      return self:ToStringA2A( Controllable, Settings )
    else
      return self:ToStringA2G( Controllable, Settings )
    end
    
    return nil

  end

  --- Provides a pressure string of the point, based on a measurement system:
  --   * Uses default settings in COORDINATE.
  --   * Can be overridden if for a GROUP containing x clients, a menu was selected to override the default.
  -- @param #COORDINATE self
  -- @param Wrapper.Controllable#CONTROLLABLE Controllable
  -- @param Core.Settings#SETTINGS Settings
  -- @return #string The pressure text in the configured measurement system.
  function COORDINATE:ToStringPressure( Controllable, Settings ) -- R2.3
  
    self:F2( { Controllable = Controllable and Controllable:GetName() } )

    local Settings = Settings or ( Controllable and _DATABASE:GetPlayerSettings( Controllable:GetPlayerName() ) ) or _SETTINGS

    return self:GetPressureText( nil, Settings )
  end

  --- Provides a wind string of the point, based on a measurement system:
  --   * Uses default settings in COORDINATE.
  --   * Can be overridden if for a GROUP containing x clients, a menu was selected to override the default.
  -- @param #COORDINATE self
  -- @param Wrapper.Controllable#CONTROLLABLE Controllable
  -- @param Core.Settings#SETTINGS Settings
  -- @return #string The wind text in the configured measurement system.
  function COORDINATE:ToStringWind( Controllable, Settings ) -- R2.3
  
    self:F2( { Controllable = Controllable and Controllable:GetName() } )

    local Settings = Settings or ( Controllable and _DATABASE:GetPlayerSettings( Controllable:GetPlayerName() ) ) or _SETTINGS

    return self:GetWindText( nil, Settings )
  end

  --- Provides a temperature string of the point, based on a measurement system:
  --   * Uses default settings in COORDINATE.
  --   * Can be overridden if for a GROUP containing x clients, a menu was selected to override the default.
  -- @param #COORDINATE self
  -- @param Wrapper.Controllable#CONTROLLABLE Controllable
  -- @param Core.Settings#SETTINGS Settings
  -- @return #string The temperature text in the configured measurement system.
  function COORDINATE:ToStringTemperature( Controllable, Settings ) -- R2.3
  
    self:F2( { Controllable = Controllable and Controllable:GetName() } )

    local Settings = Settings or ( Controllable and _DATABASE:GetPlayerSettings( Controllable:GetPlayerName() ) ) or _SETTINGS

    return self:GetTemperatureText( nil, Settings )
  end

end

do -- POINT_VEC3

  --- The POINT_VEC3 class
  -- @type POINT_VEC3
  -- @field #number x The x coordinate in 3D space.
  -- @field #number y The y coordinate in 3D space.
  -- @field #number z The z coordiante in 3D space.
  -- @field Utilities.Utils#SMOKECOLOR SmokeColor
  -- @field Utilities.Utils#FLARECOLOR FlareColor
  -- @field #POINT_VEC3.RoutePointAltType RoutePointAltType
  -- @field #POINT_VEC3.RoutePointType RoutePointType
  -- @field #POINT_VEC3.RoutePointAction RoutePointAction
  -- @extends Core.Point#COORDINATE
  
  
  --- Defines a 3D point in the simulator and with its methods, you can use or manipulate the point in 3D space.
  --
  -- **Important Note:** Most of the functions in this section were taken from MIST, and reworked to OO concepts.
  -- In order to keep the credibility of the the author,
  -- I want to emphasize that the formulas embedded in the MIST framework were created by Grimes or previous authors,
  -- who you can find on the Eagle Dynamics Forums.
  --
  --
  -- ## POINT_VEC3 constructor
  --
  -- A new POINT_VEC3 object can be created with:
  --
  --  * @{#POINT_VEC3.New}(): a 3D point.
  --  * @{#POINT_VEC3.NewFromVec3}(): a 3D point created from a @{DCS#Vec3}.
  --
  --
  -- ## Manupulate the X, Y, Z coordinates of the POINT_VEC3
  --
  -- A POINT_VEC3 class works in 3D space. It contains internally an X, Y, Z coordinate.
  -- Methods exist to manupulate these coordinates.
  --
  -- The current X, Y, Z axis can be retrieved with the methods @{#POINT_VEC3.GetX}(), @{#POINT_VEC3.GetY}(), @{#POINT_VEC3.GetZ}() respectively.
  -- The methods @{#POINT_VEC3.SetX}(), @{#POINT_VEC3.SetY}(), @{#POINT_VEC3.SetZ}() change the respective axis with a new value.
  -- The current axis values can be changed by using the methods @{#POINT_VEC3.AddX}(), @{#POINT_VEC3.AddY}(), @{#POINT_VEC3.AddZ}()
  -- to add or substract a value from the current respective axis value.
  -- Note that the Set and Add methods return the current POINT_VEC3 object, so these manipulation methods can be chained... For example:
  --
  --      local Vec3 = PointVec3:AddX( 100 ):AddZ( 150 ):GetVec3()
  --
  --
  -- ## 3D calculation methods
  --
  -- Various calculation methods exist to use or manipulate 3D space. Find below a short description of each method:
  --
  --
  -- ## Point Randomization
  --
  -- Various methods exist to calculate random locations around a given 3D point.
  --
  --   * @{#POINT_VEC3.GetRandomPointVec3InRadius}(): Provides a random 3D point around the current 3D point, in the given inner to outer band.
  --
  --
  -- @field #POINT_VEC3
  POINT_VEC3 = {
    ClassName = "POINT_VEC3",
    Metric = true,
    RoutePointAltType = {
      BARO = "BARO",
    },
    RoutePointType = {
      TakeOffParking = "TakeOffParking",
      TurningPoint = "Turning Point",
    },
    RoutePointAction = {
      FromParkingArea = "From Parking Area",
      TurningPoint = "Turning Point",
    },
  }

  --- RoutePoint AltTypes
  -- @type POINT_VEC3.RoutePointAltType
  -- @field BARO "BARO"

  --- RoutePoint Types
  -- @type POINT_VEC3.RoutePointType
  -- @field TakeOffParking "TakeOffParking"
  -- @field TurningPoint "Turning Point"

  --- RoutePoint Actions
  -- @type POINT_VEC3.RoutePointAction
  -- @field FromParkingArea "From Parking Area"
  -- @field TurningPoint "Turning Point"

  -- Constructor.

  --- Create a new POINT_VEC3 object.
  -- @param #POINT_VEC3 self
  -- @param DCS#Distance x The x coordinate of the Vec3 point, pointing to the North.
  -- @param DCS#Distance y The y coordinate of the Vec3 point, pointing Upwards.
  -- @param DCS#Distance z The z coordinate of the Vec3 point, pointing to the Right.
  -- @return Core.Point#POINT_VEC3
  function POINT_VEC3:New( x, y, z )

    local self = BASE:Inherit( self, COORDINATE:New( x, y, z ) ) -- Core.Point#POINT_VEC3
    self:F2( self )
    
    return self
  end

  --- Create a new POINT_VEC3 object from Vec2 coordinates.
  -- @param #POINT_VEC3 self
  -- @param DCS#Vec2 Vec2 The Vec2 point.
  -- @param DCS#Distance LandHeightAdd (optional) Add a landheight.
  -- @return Core.Point#POINT_VEC3 self
  function POINT_VEC3:NewFromVec2( Vec2, LandHeightAdd )

    local self = BASE:Inherit( self, COORDINATE:NewFromVec2( Vec2, LandHeightAdd ) ) -- Core.Point#POINT_VEC3
    self:F2( self )

    return self
  end


  --- Create a new POINT_VEC3 object from  Vec3 coordinates.
  -- @param #POINT_VEC3 self
  -- @param DCS#Vec3 Vec3 The Vec3 point.
  -- @return Core.Point#POINT_VEC3 self
  function POINT_VEC3:NewFromVec3( Vec3 )

    local self = BASE:Inherit( self, COORDINATE:NewFromVec3( Vec3 ) ) -- Core.Point#POINT_VEC3
    self:F2( self )
  
    return self
  end



  --- Return the x coordinate of the POINT_VEC3.
  -- @param #POINT_VEC3 self
  -- @return #number The x coodinate.
  function POINT_VEC3:GetX()
    return self.x
  end

  --- Return the y coordinate of the POINT_VEC3.
  -- @param #POINT_VEC3 self
  -- @return #number The y coodinate.
  function POINT_VEC3:GetY()
    return self.y
  end

  --- Return the z coordinate of the POINT_VEC3.
  -- @param #POINT_VEC3 self
  -- @return #number The z coodinate.
  function POINT_VEC3:GetZ()
    return self.z
  end

  --- Set the x coordinate of the POINT_VEC3.
  -- @param #POINT_VEC3 self
  -- @param #number x The x coordinate.
  -- @return #POINT_VEC3
  function POINT_VEC3:SetX( x )
    self.x = x
    return self
  end

  --- Set the y coordinate of the POINT_VEC3.
  -- @param #POINT_VEC3 self
  -- @param #number y The y coordinate.
  -- @return #POINT_VEC3
  function POINT_VEC3:SetY( y )
    self.y = y
    return self
  end

  --- Set the z coordinate of the POINT_VEC3.
  -- @param #POINT_VEC3 self
  -- @param #number z The z coordinate.
  -- @return #POINT_VEC3
  function POINT_VEC3:SetZ( z )
    self.z = z
    return self
  end

  --- Add to the x coordinate of the POINT_VEC3.
  -- @param #POINT_VEC3 self
  -- @param #number x The x coordinate value to add to the current x coodinate.
  -- @return #POINT_VEC3
  function POINT_VEC3:AddX( x )
    self.x = self.x + x
    return self
  end

  --- Add to the y coordinate of the POINT_VEC3.
  -- @param #POINT_VEC3 self
  -- @param #number y The y coordinate value to add to the current y coodinate.
  -- @return #POINT_VEC3
  function POINT_VEC3:AddY( y )
    self.y = self.y + y
    return self
  end

  --- Add to the z coordinate of the POINT_VEC3.
  -- @param #POINT_VEC3 self
  -- @param #number z The z coordinate value to add to the current z coodinate.
  -- @return #POINT_VEC3
  function POINT_VEC3:AddZ( z )
    self.z = self.z +z
    return self
  end

  --- Return a random POINT_VEC3 within an Outer Radius and optionally NOT within an Inner Radius of the POINT_VEC3.
  -- @param #POINT_VEC3 self
  -- @param DCS#Distance OuterRadius
  -- @param DCS#Distance InnerRadius
  -- @return #POINT_VEC3
  function POINT_VEC3:GetRandomPointVec3InRadius( OuterRadius, InnerRadius )

    return POINT_VEC3:NewFromVec3( self:GetRandomVec3InRadius( OuterRadius, InnerRadius ) )
  end

end

do -- POINT_VEC2

  --- @type POINT_VEC2
  -- @field DCS#Distance x The x coordinate in meters.
  -- @field DCS#Distance y the y coordinate in meters.
  -- @extends Core.Point#COORDINATE
  
  --- Defines a 2D point in the simulator. The height coordinate (if needed) will be the land height + an optional added height specified.
  --
  -- ## POINT_VEC2 constructor
  --
  -- A new POINT_VEC2 instance can be created with:
  --
  --  * @{Core.Point#POINT_VEC2.New}(): a 2D point, taking an additional height parameter.
  --  * @{Core.Point#POINT_VEC2.NewFromVec2}(): a 2D point created from a @{DCS#Vec2}.
  --
  -- ## Manupulate the X, Altitude, Y coordinates of the 2D point
  --
  -- A POINT_VEC2 class works in 2D space, with an altitude setting. It contains internally an X, Altitude, Y coordinate.
  -- Methods exist to manupulate these coordinates.
  --
  -- The current X, Altitude, Y axis can be retrieved with the methods @{#POINT_VEC2.GetX}(), @{#POINT_VEC2.GetAlt}(), @{#POINT_VEC2.GetY}() respectively.
  -- The methods @{#POINT_VEC2.SetX}(), @{#POINT_VEC2.SetAlt}(), @{#POINT_VEC2.SetY}() change the respective axis with a new value.
  -- The current Lat(itude), Alt(itude), Lon(gitude) values can also be retrieved with the methods @{#POINT_VEC2.GetLat}(), @{#POINT_VEC2.GetAlt}(), @{#POINT_VEC2.GetLon}() respectively.
  -- The current axis values can be changed by using the methods @{#POINT_VEC2.AddX}(), @{#POINT_VEC2.AddAlt}(), @{#POINT_VEC2.AddY}()
  -- to add or substract a value from the current respective axis value.
  -- Note that the Set and Add methods return the current POINT_VEC2 object, so these manipulation methods can be chained... For example:
  --
  --      local Vec2 = PointVec2:AddX( 100 ):AddY( 2000 ):GetVec2()
  --
  -- @field #POINT_VEC2
  POINT_VEC2 = {
    ClassName = "POINT_VEC2",
  }
  


  --- POINT_VEC2 constructor.
  -- @param #POINT_VEC2 self
  -- @param DCS#Distance x The x coordinate of the Vec3 point, pointing to the North.
  -- @param DCS#Distance y The y coordinate of the Vec3 point, pointing to the Right.
  -- @param DCS#Distance LandHeightAdd (optional) The default height if required to be evaluated will be the land height of the x, y coordinate. You can specify an extra height to be added to the land height.
  -- @return Core.Point#POINT_VEC2
  function POINT_VEC2:New( x, y, LandHeightAdd )

    local LandHeight = land.getHeight( { ["x"] = x, ["y"] = y } )

    LandHeightAdd = LandHeightAdd or 0
    LandHeight = LandHeight + LandHeightAdd

    local self = BASE:Inherit( self, COORDINATE:New( x, LandHeight, y ) ) -- Core.Point#POINT_VEC2
    self:F2( self )

    return self
  end

  --- Create a new POINT_VEC2 object from  Vec2 coordinates.
  -- @param #POINT_VEC2 self
  -- @param DCS#Vec2 Vec2 The Vec2 point.
  -- @return Core.Point#POINT_VEC2 self
  function POINT_VEC2:NewFromVec2( Vec2, LandHeightAdd )

    local LandHeight = land.getHeight( Vec2 )

    LandHeightAdd = LandHeightAdd or 0
    LandHeight = LandHeight + LandHeightAdd

    local self = BASE:Inherit( self, COORDINATE:NewFromVec2( Vec2, LandHeightAdd ) ) -- #POINT_VEC2
    self:F2( self )

    return self
  end

  --- Create a new POINT_VEC2 object from  Vec3 coordinates.
  -- @param #POINT_VEC2 self
  -- @param DCS#Vec3 Vec3 The Vec3 point.
  -- @return Core.Point#POINT_VEC2 self
  function POINT_VEC2:NewFromVec3( Vec3 )

    local self = BASE:Inherit( self, COORDINATE:NewFromVec3( Vec3 ) ) -- #POINT_VEC2
    self:F2( self )

    return self
  end

  --- Return the x coordinate of the POINT_VEC2.
  -- @param #POINT_VEC2 self
  -- @return #number The x coodinate.
  function POINT_VEC2:GetX()
    return self.x
  end

  --- Return the y coordinate of the POINT_VEC2.
  -- @param #POINT_VEC2 self
  -- @return #number The y coodinate.
  function POINT_VEC2:GetY()
    return self.z
  end

  --- Set the x coordinate of the POINT_VEC2.
  -- @param #POINT_VEC2 self
  -- @param #number x The x coordinate.
  -- @return #POINT_VEC2
  function POINT_VEC2:SetX( x )
    self.x = x
    return self
  end

  --- Set the y coordinate of the POINT_VEC2.
  -- @param #POINT_VEC2 self
  -- @param #number y The y coordinate.
  -- @return #POINT_VEC2
  function POINT_VEC2:SetY( y )
    self.z = y
    return self
  end

  --- Return Return the Lat(itude) coordinate of the POINT_VEC2 (ie: (parent)POINT_VEC3.x).
  -- @param #POINT_VEC2 self
  -- @return #number The x coodinate.
  function POINT_VEC2:GetLat()
    return self.x
  end

  --- Set the Lat(itude) coordinate of the POINT_VEC2 (ie: POINT_VEC3.x).
  -- @param #POINT_VEC2 self
  -- @param #number x The x coordinate.
  -- @return #POINT_VEC2
  function POINT_VEC2:SetLat( x )
    self.x = x
    return self
  end

  --- Return the Lon(gitude) coordinate of the POINT_VEC2 (ie: (parent)POINT_VEC3.z).
  -- @param #POINT_VEC2 self
  -- @return #number The y coodinate.
  function POINT_VEC2:GetLon()
    return self.z
  end

  --- Set the Lon(gitude) coordinate of the POINT_VEC2 (ie: POINT_VEC3.z).
  -- @param #POINT_VEC2 self
  -- @param #number y The y coordinate.
  -- @return #POINT_VEC2
  function POINT_VEC2:SetLon( z )
    self.z = z
    return self
  end

  --- Return the altitude (height) of the land at the POINT_VEC2.
  -- @param #POINT_VEC2 self
  -- @return #number The land altitude.
  function POINT_VEC2:GetAlt()
    return self.y ~= 0 or land.getHeight( { x = self.x, y = self.z } )
  end

  --- Set the altitude of the POINT_VEC2.
  -- @param #POINT_VEC2 self
  -- @param #number Altitude The land altitude. If nothing (nil) is given, then the current land altitude is set.
  -- @return #POINT_VEC2
  function POINT_VEC2:SetAlt( Altitude )
    self.y = Altitude or land.getHeight( { x = self.x, y = self.z } )
    return self
  end

  --- Add to the x coordinate of the POINT_VEC2.
  -- @param #POINT_VEC2 self
  -- @param #number x The x coordinate.
  -- @return #POINT_VEC2
  function POINT_VEC2:AddX( x )
    self.x = self.x + x
    return self
  end

  --- Add to the y coordinate of the POINT_VEC2.
  -- @param #POINT_VEC2 self
  -- @param #number y The y coordinate.
  -- @return #POINT_VEC2
  function POINT_VEC2:AddY( y )
    self.z = self.z + y
    return self
  end

  --- Add to the current land height an altitude.
  -- @param #POINT_VEC2 self
  -- @param #number Altitude The Altitude to add. If nothing (nil) is given, then the current land altitude is set.
  -- @return #POINT_VEC2
  function POINT_VEC2:AddAlt( Altitude )
    self.y = land.getHeight( { x = self.x, y = self.z } ) + Altitude or 0
    return self
  end


  --- Return a random POINT_VEC2 within an Outer Radius and optionally NOT within an Inner Radius of the POINT_VEC2.
  -- @param #POINT_VEC2 self
  -- @param DCS#Distance OuterRadius
  -- @param DCS#Distance InnerRadius
  -- @return #POINT_VEC2
  function POINT_VEC2:GetRandomPointVec2InRadius( OuterRadius, InnerRadius )
    self:F2( { OuterRadius, InnerRadius } )

    return POINT_VEC2:NewFromVec2( self:GetRandomVec2InRadius( OuterRadius, InnerRadius ) )
  end

  -- TODO: Check this to replace
  --- Calculate the distance from a reference @{#POINT_VEC2}.
  -- @param #POINT_VEC2 self
  -- @param #POINT_VEC2 PointVec2Reference The reference @{#POINT_VEC2}.
  -- @return DCS#Distance The distance from the reference @{#POINT_VEC2} in meters.
  function POINT_VEC2:DistanceFromPointVec2( PointVec2Reference )
    self:F2( PointVec2Reference )

    local Distance = ( ( PointVec2Reference.x - self.x ) ^ 2 + ( PointVec2Reference.z - self.z ) ^2 ) ^ 0.5

    self:T2( Distance )
    return Distance
  end

end