'*****************************************************************************


' $Id$


'


' Project:  GDAL VB6 Bindings


' Purpose:  VB6 OGRCoordinateTransformation Shadow Class.


' Author:   Frank Warmerdam, warmerdam@pobox.com


'


'*****************************************************************************


' Copyright (c) 2005, Frank Warmerdam <warmerdam@pobox.com>


'


' Permission is hereby granted, free of charge, to any person obtaining a


' copy of this software and associated documentation files (the "Software"),


' to deal in the Software without restriction, including without limitation


' the rights to use, copy, modify, merge, publish, distribute, sublicense,


' and/or sell copies of the Software, and to permit persons to whom the


' Software is furnished to do so, subject to the following conditions:


'


' The above copyright notice and this permission notice shall be included


' in all copies or substantial portions of the Software.


'


' THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS


' OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,


' FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL


' THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER


' LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING


' FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER


' DEALINGS IN THE SOFTWARE.


'*****************************************************************************


'


' $Log$
' Revision 1.5  2006/03/22 04:38:16  fwarmerdam
' fixed header
'
' Revision 1.4  2006/03/22 04:37:10  fwarmerdam
' Added copyright header
'
'

VERSION 1.0 CLASS
BEGIN
  MultiUse = -1  'True
  Persistable = 0  'NotPersistable
  DataBindingBehavior = 0  'vbNone
  DataSourceBehavior  = 0  'vbNone
  MTSTransactionMode  = 0  'NotAnMTSObject
END
Attribute VB_Name = "OGRCoordinateTransformation"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False

' ----------------------------------------------------------------------------
Option Explicit

Private obj As Long
Private owned As Long

' ----------------------------------------------------------------------------
Private Sub Class_Initialize()
    obj = 0
    owned = 0
End Sub

' ----------------------------------------------------------------------------
Private Sub Class_Terminate()
    If obj <> 0 And owned <> 0 Then
        Call Destroy
    End If
End Sub

' ----------------------------------------------------------------------------
Public Sub CInit(obj_in As Long, owned_in As Long)
    If obj <> 0 Then
        Call GDALCore.OCTDestroyCoordinateTransformation(obj)
    End If
    obj = obj_in
    owned = owned_in
End Sub

' ----------------------------------------------------------------------------
Public Sub Destroy()
    If obj <> 0 Then
        Call GDALCore.OCTDestroyCoordinateTransformation(obj)
'        Call MsgBox("Destroying OGRCoordinateTransformation")
        obj = 0
        owned = 0
    End If
End Sub

' ----------------------------------------------------------------------------
Public Function IsValid() As Boolean
    If obj <> 0 Then
        IsValid = True
    Else
        IsValid = False
    End If
End Function

' ----------------------------------------------------------------------------
' Eventually we might add a multi-point version but this is simple
' to do for now, and quite useful.
Public Function TransformOne(ByRef X As Double, ByRef Y As Double, _
                              ByRef Z As Double) As Boolean
    If obj <> 0 Then
        Dim Success As Long
        Dim RetValue As Long

        RetValue = GDALCore.OCTTransformEx(obj, 1, X, Y, Z, Success)
        If Success = 0 Or RetValue = 0 Then
            TransformOne = False
        Else
            TransformOne = True
        End If
    Else
        TransformOne = False
    End If
End Function