/usr/share/gnudatalanguage/coyote/cgshapepointfile.pro is in gdl-coyote 2016.11.13-2.
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;
; NAME:
; cgShapePointFile
;
; PURPOSE:
; The purpose of this program is to create a shapefile filled with multiple
; individual points as entities.
;
;******************************************************************************************;
; ;
; 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. ;
;******************************************************************************************;
;
;+--------------------------------------------------------------------------
; The purpose of this program is to create a shapefile filled with multiple
; individual points as entities.
;
; :Categories:
; Mapping, Utilities
;
; :Author:
; FANNING SOFTWARE CONSULTING::
; David W. Fanning
; 1645 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: david@idlcoyote.com
; Coyote's Guide to IDL Programming: http://www.idlcoyote.com
;
; :Params:
; xpts: in, required, type=vector
; The X location of the input points. Presumed to be longitude values unless
; the `MapCoord` keyword is used, in which case they are assumed to be in
; projected meters values that will be converted to longitude values for
; storage in the shapefile.
; ypts: in, required, type=vector
; The Y location of the input points. Presumed to be latitude values unless
; the `MapCoord` keyword is used, in which case they are assumed to be in
; projected meters values that will be converted to latitude values for
; storage in the shapefile.
;
; :Keywords:
; append: in, optional, type=boolean, default=0
; Set this keyword to append the points to a currently existing file. Otherwise,
; a new file is created.
; attributes: in, optional, type=structure
; An array or scalar of "attribute" structures. If an array, it must be the same length as
; in input data points. If not provided is will consist of the follow structure: {point:indexValue}.
; If appending to a file, it must be defined in exactly the same way as the original file attributes.
; filename: in, optional, type=string
; The name of the shapefile. If not provided, the user will be asked to select a shape
; file. If the file currently exists, it will be written over.
; mapcoord: in, optional, type=object
; A MapCoord object (e.g., cgMap) which will be used to convert the input points from
; projected meter space to lat/lon space prior to saving the data in the shapefile.
;
; :Examples:
; Add two cities to a shapefile::
; num = 2
; x = FltArr(num)
; y = FltArr(num)
; attr = Replicate({namedStruct, state:"", city:""}, num)
; x[0] = -104.87270
; y[0] = 39.768040
; attr[0] ={namedStruct, 'CO', 'DENVER'}
; x[1] = -105.1
; y[1] = 40.6
; attr[1] ={nameStruct, 'CO', 'FORT COLLINS'}
; cgShapePointFile, x, y, ATTRIBUTES=attr, FILENAME='test.shp'
;
; Add two more cities to the same shapefile::
; num = 2
; x = FltArr(num)
; y = FltArr(num)
; attr = Replicate({namedStruct, state:"", city:""}, num)
; x[0] = -122.7
; y[0] = 45.5
; attr[0] ={namedStruct, 'OR', 'Portland'}
; x[1] = -122.3
; y[1] = 47.6
; attr[1] ={namedStruct, 'WA', 'Seattle'}
; cgShapePointFile, x, y, ATTRIBUTES=attr, FILENAME='test.shp', /APPEND
;
; View the file you just created::
; cgShapeInfo, 'test.shp'
;
; :History:
; Modification History::
; Written by David W. Fanning, 23 August 2012.
;
; :Copyright:
; Copyright (c) 2012, Fanning Software Consulting, Inc.
;-
PRO cgShapePointFile, xpts, ypts, $
APPEND=appending, $
ATTRIBUTES=attributes, $
FILENAME=filename, $
MAPCOORD=mapCoord
Compile_Opt idl2
; Standard error handling.
Catch, theError
IF theError NE 0 THEN BEGIN
Catch, /CANCEL
void = cgErrorMsg()
Obj_Destroy, shapefile
RETURN
ENDIF
; Need point input parameters of points.
IF N_Params() NE 2 THEN BEGIN
void = Dialog_Message('Calling sequence: cgShapePointFile, xpts, ypts, ATTRIBUTES=attributes, FILENAME=filename')
RETURN
ENDIF
; Do we need a filename?
IF N_Elements(filename) EQ 0 THEN BEGIN
filename = cgPickfile(/Write, Title='Select a SHAPEFILE for Writing...')
IF filename EQ "" THEN RETURN
ENDIF
; If the file exists, and you are not appending to it, then delete it.
appending = Keyword_Set(appending)
IF File_Test(filename) && ~appending THEN BEGIN
; Print, 'Deleting current file: ' + filename
File_Delete, filename
ENDIF
; Do the points have to be converted to lat/lon?
IF Obj_Valid(mapCoord) THEN BEGIN
xy = mapCoord -> Inverse(xpts, ypts)
x = Reform(xy[0,*])
y = Reform(xy[1,*])
ENDIF ELSE BEGIN
x = xpts
y = ypts
ENDELSE
IF N_Elements(xpts) NE N_Elements(ypts) THEN Message, 'The point vectors must be the same length.'
numPts = N_Elements(xpts)
; Do we have an attibute structure?
IF N_Elements(attributes) EQ 0 THEN BEGIN
struct = {point:0L}
attributes = Replicate(struct, numPts)
attributes.point = LIndgen(numPts)
ENDIF
IF N_Elements(attributes) EQ 1 THEN attributes = Replicate(attributes, numPts)
IF N_Elements(attributes) NE numPts THEN $
Message, 'The number of attribute structures must match the number of points being added.'
; Open the shapefile for writing point data.
IF appending THEN BEGIN
shapefile = Obj_New('IDLffShape', filename, /UPDATE)
ENDIF ELSE BEGIN
shapefile = Obj_New('IDLffShape', filename, /UPDATE, ENTITY_TYPE=1)
ENDELSE
; Define the attribute names if you are not appending to an already existing shapefile.
IF ~appending THEN BEGIN
; Set the attribute names.
struct = attributes[0]
; Make sure attribute names are less than 11 characters in length.
attrnames = Tag_Names(struct)
index = Where(StrLen(attrnames) GT 11, count)
IF count GT 0 THEN Message, 'Attribute names cannot be longer than 11 characters.'
; Get the attribute type.
FOR j=0,N_Elements(attrnames)-1 DO BEGIN
value = struct.(j)
dataType = Size(value, /TYPE)
CASE dataType OF
1: attrtype = 3
2: attrtype = 3
3: attrtype = 3
4: attrtype = 5
5: attrtype = 5
7: attrtype = 7
12: attrtype = 3
13: attrtype = 3
14: attrtype = 3
ELSE: Message, 'Attribute value of type: ' + Size(value, /TNAME) + ' is not supported.'
ENDCASE
; Define the new attribute.
CASE attrtype OF
3: shapefile -> AddAttribute, attrnames[j], attrtype, 16
5: shapefile -> AddAttribute, attrnames[j], attrtype, 20, Precision=8
7: shapefile -> AddAttribute, attrnames[j], attrtype, 25
ENDCASE
ENDFOR
ENDIF
; Loop, creating entities for all the points. Points are saved in the BOUNDS field.
FOR j=0,numPts-1 DO BEGIN
; Get a new entity structure.
entNew = {IDL_SHAPE_ENTITY}
; Define the new values.
entNew.SHAPE_TYPE = 1
entNew.BOUNDS[0] = x[j]
entNew.BOUNDS[1] = y[j]
entNew.BOUNDS[2] = 0.00000000
entNew.BOUNDS[3] = 0.00000000
entNew.BOUNDS[4] = x[j]
entNew.BOUNDS[5] = x[j]
entNew.BOUNDS[6] = 0.00000000
entNew.BOUNDS[7] = 0.00000000
entNew.N_VERTICES = 1
; Create a new attribute structure.
attrNew = shapefile -> GetAttributes(/ATTRIBUTE_STRUCTURE)
thisAttrStruct = attributes[j]
FOR k=0, N_Tags(attrNew)-1 DO BEGIN
attrNew.(k) = thisAttrStruct.(k)
ENDFOR
; Add the entity to the shapefile.
shapefile -> PutEntity, entNew
; Get the entity index.
shapefile -> GetProperty, N_ENTITIES=numEntities
entity_index = numEntities-1
; Add the attributes to the shapefile
shapefile -> SetAttributes, entity_index, attrNew
ENDFOR
Obj_Destroy, shapefile
END
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