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cgkml_object__define.pro
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cgkml_object__define.pro
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; docformat = 'rst'
;
; NAME:
; cgKML_Object
;
; PURPOSE:
; This program implements the KML abstract OBJECT class.
;
;******************************************************************************************;
; ;
; Copyright (c) 2012, by Fanning Software Consulting, Inc. All rights reserved. ;
; ;
; Redistribution and use in source and binary forms, with or without ;
; modification, are permitted provided that the following conditions are met: ;
; ;
; * Redistributions of source code must retain the above copyright ;
; notice, this list of conditions and the following disclaimer. ;
; * Redistributions in binary form must reproduce the above copyright ;
; notice, this list of conditions and the following disclaimer in the ;
; documentation and/or other materials provided with the distribution. ;
; * Neither the name of Fanning Software Consulting, Inc. nor the names of its ;
; contributors may be used to endorse or promote products derived from this ;
; software without specific prior written permission. ;
; ;
; THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY ;
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES ;
; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT ;
; SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT, ;
; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED ;
; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; ;
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ;
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ;
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ;
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ;
;******************************************************************************************;
;
;+
; This program implements the KML abstract OBJECT class. For
; reference, see the `Google KML Reference Documentation <https://developers.google.com/kml/documentation/kmlreference#object>`.
; A Object object is a basic KML class, and should be inherited by,
; for example, a cgKML_Feature object, which extends this KML abstract
; class.
;
; :Categories:
; Graphics, FileIO
;
; :Examples:
; See the `cgKML_File` object for examples of how to create a KML file.
;
;
; :Author:
; FANNING SOFTWARE CONSULTING::
; David W. Fanning
; 1645 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: [email protected]
; Coyote's Guide to IDL Programming: http://www.idlcoyote.com
;
; :History:
; Change History::
; Written, 28 October 2012 by David W. Fanning.
;
; :Copyright:
; Copyright (c) 2012, Fanning Software Consulting, Inc.
;-
;+
; The purpose of this method is to establish an abstract KML Object class. For reference, see
; https://developers.google.com/kml/documentation/kmlreference#object.
;
; :Params:
; id: in, optional, type=string
; An ID attribute which allows unique identification of a KML element. For reference, see
; https://developers.google.com/kml/documentation/kmlreference#object. The ID attribute must
; be assigned in the <Update> mechanism is to be used.
;
; :Keywords:
; targetid: in, optional, type=string
; A targetID attribute which is used to reference objects that have already been loaded
; into Google Earch. For reference, see
; https://developers.google.com/kml/documentation/kmlreference#object.
; _ref_extra: in, optional
; Any keywords appropriate for superclass objects may be passed into the program.
;-
FUNCTION cgKML_Object::INIT, id, TARGETID=targetID, _REF_EXTRA=extra
Compile_Opt idl2
Catch, theError
IF theError NE 0 THEN BEGIN
Catch, /CANCEL
void = cgErrorMsg()
RETURN, 0
ENDIF
; Call the superclass object's INIT method.
IF ~self -> cgContainer::INIT(_Strict_Extra=extra) THEN RETURN, 0
; Load the object.
IF N_Elements(id) NE 0 THEN self.id = id
IF N_Elements(targetID) NE 0 THEN self.targetID = targetID
RETURN, 1
END
;+
; This BUILD method is an abstract method that should be overridden by any
; object that you intend to add to a KML file. It is used to build the
; actual KML code for the element in question.
;
; :Keywords:
; lun: in, required, type=integer
; The logical unit number of the open KML file to write to.
;-
PRO cgKML_Object::Build, LUN=lun
Compile_Opt idl2
Catch, theError
IF theError NE 0 THEN BEGIN
Catch, /CANCEL
void = cgErrorMsg()
RETURN
ENDIF
Message, 'The BUILD method should be overridden by the object you are adding to the KML file.'
;self -> Head, LUN=lun
;self -> Body, LUN=lun
;self -> Tail, LUN=lun
END
;+
; This method writes an XML tag into the file. All parameters and
; keywords are required. Sequence is: <tag>value</tag>.
;
; :Params:
; tag: in, required, type='string'
; The name of the XML tag to write to the file.
; value: in, required
; The value of the tag. May be any type of data that can be converted
; to a string.
;
; :Keywords:
; lun: in, required, type=integer
; The logical unit number of the open KML file to write to.
; space
;-
PRO cgKML_Object::XMLTag, tag, value, LUN=lun, SPACE=space
Compile_Opt idl2
Catch, theError
IF theError NE 0 THEN BEGIN
Catch, /CANCEL
void = cgErrorMsg()
RETURN
ENDIF
; All positional parameters are required.
IF (N_Params() NE 2) THEN Message, 'Calling sequence: obj->XMLTag, tag, value, LUN=lun'
; LUN is required
IF N_Elements(lun) EQ 0 THEN Message, 'Calling sequence: obj->XMLTag, tag, value, LUN=lun'
; Handle indenting.
IF N_Elements(space) EQ 0 THEN BEGIN
space = ""
ENDIF ELSE BEGIN
space = String(BytArr(space) + 32B)
ENDELSE
PrintF, lun, space + '<' + tag + '>' + StrTrim(value, 2) + '</' + tag + '>'
END
;+
; The purpose of this function method is to return the parent object reference.
;-
FUNCTION cgKML_Object::GetParent
RETURN, self.parent
END
;+
; The purpose of this method is to return object properties.
;
; :Keywords:
; id: out, optional, type=string
; The object ID.
; parent: out, optional, type=objref
; The parent object reference.
; targetid: out, optional, type=string
; The targetID of the object.
; _ref_extra: out, optional
; Any keywords for the superclass objects are allowed.
;-
PRO cgKML_Object::GetProperty, $
ID=id, $
PARENT=parent, $
TARGETID=targetID, $
_REF_EXTRA=extra
IF Arg_Present(id) THEN id = self.id
IF Arg_Present(parent) THEN parent = self.parent
IF Arg_Present(targetID) THEN targetID = self.targetID
; Superclass keywords.
IF N_Elements(extra) NE 0 THEN self -> cgCONTAINER::GetProperty, _Strict_Extra=extra
END
;+
; The purpose of this method is to set object properties.
;
; :Keywords:
; id: in, optional, type=string
; The object ID.
; parent: in, optional, type=objref
; The parent object reference.
; targetid: in, optional, type=string
; The targetID of the object.
; _ref_extra: out, optional
; Any keywords for the superclass objects are allowed.
;-
PRO cgKML_Object::SetProperty, $
ID=id, $
PARENT=parent, $
TARGETID=targetID, $
_REF_EXTRA=extra
IF N_Elements(id) NE 0 THEN self.id = id
IF N_Elements(parent) NE 0 THEN self.parent = parent
IF N_Elements(targetID) NE 0 THEN self.targetID = targetID
; Superclass keywords.
IF N_Elements(extra) NE 0 THEN self -> cgCONTAINER::GetProperty, _Strict_Extra=extra
END
;+
; The purpose of this method is to destroy anything we created that may leak
; memory or need to be released from use.
;-
PRO cgKML_Object::CLEANUP
; Destroy all the objects in this container.
childObjs = self -> Get(/ALL, COUNT=count)
FOR j=0,count-1 DO Obj_Destroy, childObjs
; Call the superclass object's CLEANUP method
self -> cgContainer::Cleanup
END
;+
; The cgKML_OBJECT class definition module. This is a mostly abstract class
; that will be inherited by cgKML_Feature and cgKML_Geometery objects (among others).
; Basically, any KML element that should be added to a KML file will inherit this
; object. It is a container object and represents part of the KML file hierarchy.
; Only objects of cgKML_Object class can be added to cgKML_File objects.
;
; :Params:
; class: out, optional, type=structure
; The class definition returned as a structure variable. Occassionally useful.
;-
PRO cgKML_Object__Define, class
class = { cgKML_OBJECT, $
INHERITS cgContainer, $ ; A modified IDL_CONTAINER.
ID: "", $ ; The "identifier" of this element.
parent: Obj_New(), $ ; The "parent" object.
targetID: "" $ ; The targetID reference.
}
END