coyote: CGSHAPEINFO

Description
The purpose of this program is allow the user to browse a very narrow
selection of shapefiles. Namely, those containing geographical shapes
in latitude and longitude coordinates. In other words, shapefiles
containing maps. File attributes are listed in the left-hand list
widget. Clicking on a file attribute, will list all the entity
attributes for that file attribute in the right-hand list. Clicking
an entity attribute with list the type of entity, and the X and Y
bounds of that entity (shown as LON and LAT, respectively), in the
statusbar at the bottom of the display.
Knowing the attribute and entity names of a shapefile will give
you insight into how to read and display the information in the file.
For examples, see the Coyote Library program cgDrawShapes.
Categories
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
Examples
To learn about and draw the states.shp file in the IDL examples directory::
   filename = Filepath(SubDir=['examples','data'], 'states.shp')
   cgShapeInfo, filename, XRANGE=xr, YRANGE=yr
   cgPlot, xr, yr, /NoData, XStyle=1, YStyle=1
   cgDrawShapes, filename
History
Modification History::
   Written by David W. Fanning, 21 October 2006.
   Slight modifications to the interface. 14 May 2010. DWF.
   Added XRANGE and YRANGE output keywords. 15 May 2010. DWF.
   Renamed cgShapeFile from Shapefile. 20 Aug 2012. DWF.
   Modified so that when the user selects a new Attribute Name, the Attribue Value index stays
      the same. 24 Nov 2013. DWF.
   Fixed a type with a progress bar. 26 March 2014. DWF.
Copyright
Copyright (c) 2006-2013, Fanning Software Consulting, Inc.
he event handler for the program.
Params
filename: in, optional, type=string
    The name of the shapefile you wish to browse. If not provided, the user
    will be asked to select a shapefile.
Keywords
xrange: out, optional, type=float
     The X range of the shapefile contents in the native units of the shapefile.
yrange: out, optional, type=float
     The Y range of the shapefile contents in the native units of the shapefile.