[geos-devel] Proposal to add Coordinate class to c api

[Charlie Savage]

Could you draw some requirements necessary to fulfill by an object
exposed to ruby?
I believe there should be no problem, if it won't break simplicity and
C-nature of the GEOS C API.

 GEOSCoordinate  *GEOSCoordinate_create(double x, double y, double z);
 GEOSCoordinate  *GEOSCoordinate_clone(const GEOSCoordinate* s);
 void  GEOSCoordinate_destroy(GEOSCoordinate* s);

 char  GEOSCoordinate_equals(GEOSCoordinate* s);

 int  GEOSCoordinate_setX(GEOSCoordinate* s, double val);
 int  GEOSCoordinate_setY(GEOSCoordinate* s, double val);
 int  GEOSCoordinate_setZ(GEOSCoordinate* s, double val);

 int  GEOSCoordinate_getX(const GEOSCoordinate* s, double *val);
 int  GEOSCoordinate_getY(const GEOSCoordinate* s, double *val);
 int  GEOSCoordinate_getZ(const GEOSCoordinate* s, double *val);


Next, update coordinate sequence so that you can:





* Add a getter to point ("getCoordinate()") that returns its coordinate





That should do the trick.



Thanks,

Charlie

First, expose the coordinate class (I've removed extern and GEOS_DLL for readability): * Add a coordinate to a coordinate sequence. Right now there is no way to expand a coordinate sequence in the c api which is an extreme limitation. * Add a getter to coordinate sequence "getCoordinate(size_t index)" that returns a coordiante * Add a method that lets you create a coordinate sequence from a coordinate (see next bullet). * I'd like to change GEOSGeom_createPoint to take a coordinate, not a coordinate sequence. But that would break backward compatibility - so maybe a new API? Or maybe the constructor to create a coordinate sequence from a coordinate is good enough. And while on the subject - exposing the envelope class would be helpful for working with boundings boxes. I find it nicer to work with than a polygon acting as a bounding box. Envelope provides niceties like minX, minY, expandBy, expandToInclude, etc.

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