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Re: reading shapefiles & IDL objects [message #84682 is a reply to message #78842]

Thu, 28 June 2012 14:40

kristen234
Messages: 1
Registered: June 2012

Junior Member

On Wednesday, December 21, 2011 2:27:27 PM UTC-7, desertdryad wrote:
> On Dec 21, 2:16 pm, desertdryad <dry...@gmail.com> wrote:
>>> The simplest way is just to march through the entities
>>> and keep track of the entities's bounds. This is how
>>> cgDrawShapes works, when you set the AutoDraw keyword.
>>
>>> FOR j=0,N_Elements(*entities)-1 DO BEGIN
>>> thisEntity = (*entities)[j]
>>> entityMinX[j] = thisEntity.bounds[0]
>>> entityMaxX[j] = thisEntity.bounds[4]
>>> entityMiny[j] = thisEntity.bounds[1]
>>> entityMaxY[j] = thisEntity.bounds[5]
>>> ENDFOR
>>> xrange = [Min(entityMinX), Max(entityMaxX)]
>>> yrange = [Min(entityMinY), Max(entityMaxY)]
>>> cgPlot, xrange, yrange, ....
>>
>>> Cheers,
>>
>>> David
>>
>> I think I get that. Thanks, David!!
>
> PS - all the pieces are in the same directory.. I know GIS better than
> I know IDL :)

Did you ever figure out why moving your shapefile to the directory with 'states.shp' was necessary? I'm having the same problem with my shapefile, but I'm not permitted to save files to the IDL distribution directories. Thanks for the help!

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[Message index]

		reading shapefiles & IDL objects By: desertdryad on Tue, 20 December 2011 15:48
		Re: reading shapefiles & IDL objects By: desertdryad on Wed, 21 December 2011 13:27
		Re: reading shapefiles & IDL objects By: kristen234 on Thu, 28 June 2012 14:40
		Re: reading shapefiles & IDL objects By: desertdryad on Wed, 21 December 2011 13:16
		Re: reading shapefiles & IDL objects By: David Fanning on Wed, 21 December 2011 12:12
		Re: reading shapefiles & IDL objects By: desertdryad on Wed, 21 December 2011 11:04
		Re: reading shapefiles & IDL objects By: desertdryad on Wed, 21 December 2011 10:13
		Re: reading shapefiles & IDL objects By: David Fanning on Wed, 21 December 2011 10:10
		Re: reading shapefiles & IDL objects By: David Fanning on Thu, 28 June 2012 15:00

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