[Shapelib] ESRI ArcMap reading problem

Frank Warmerdam fwarmerdam at gmail.com
Wed Feb 9 13:09:52 EST 2005

On Wed, 09 Feb 2005 11:53:07 -0600, Brian Peschel <brianp at occinc.com> wrote:
> I am having a problem with ESRI's ArcMap reading the shapes I create.
> It appears if ArcMap is taking the last point in a polygon and moving it
> to coord (0,0) causing a spike in the object displayed.  The shpDump
> program that is provided with the library isn't reporting any problems.
> I tried adding a call to SHPComputeExtents() but that didn't work
> either.  Any thoughts are this point would eb helpful.  Thanks!
> Here is glimpse of the code:
>     SHPGetInfo(shpHandle, NULL, &shapeType, NULL, NULL);
>     // Allocate memory for the points
>     padfX = static_cast<double *>(malloc(sizeof(double) * (geo.size() +
> 1)));
>     padfY = static_cast<double *>(malloc(sizeof(double) * (geo.size() +
> 1)));
>     // We never do multiple parts
>     panParts[0] = 1;


>From the SHPCreateObject() docs:

  panPartStart:		The list of zero based start vertices for the rings
                        (parts) in this object.  The first should always be
                        zero.  This may be NULL if nParts is 0.

So, I think panParts[0] should be set to 0. 

Best regards,
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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