code contribution

I'd like to contribute new code for Postgres geometry type 'path' operations
(including line buffer). Where should I send this?

Send to pgsql-patches@postgresql.org. It may be helpful to (i.e. please
do) post a summary of what you are intending to send to this mailing
list so folks have an idea of what is coming...

Regards.

- Tom

And remember to use 'cvs diff -c' to generate context sensitive diffs
against CVS...

Chris

New 'path' functions (test results can be found at http://motivation.ru/grass/buff_q_example.html):

There are not many (as my task was only limited to extending GRASS vector
capabilities to buffering):

/*check if a point is within buffer of line*/
Datum path_buffer_contain_pt(PG_FUNCTION_ARGS);

/*removes multiple repeated points from path*/
Datum path_without_doubles (PG_FUNCTION_ARGS);
static PATH * path_no_dbles(PATH *path);

/*returns closed path which is buffer to another path*/
Datum return_path_buffer(PG_FUNCTION_ARGS);

/*used to insert points along circle segment between two ends of non-intersecting buffer segments, smoothing the buffer*/
static Point * point_rotate (Point *lpoint, Point *ax_point, float ang,
int k, int n, int napr);

/*writes path to arcinfo UNGENERATE format which is particularly useful for viewing buffer in GRASS*/
Datum write_path_to_file(PG_FUNCTION_ARGS);
int write_path_to_file_internal(PATH *path, char *str );

/*generalize path,i.e., leave each third, or fourth, etc., point*/
Datum reduce_path_points(PG_FUNCTION_ARGS);
static PATH *path_reduce(PATH * path, int n_reduce);

Sorry, I am just getting to this. I have the patch in my email box too.

Can you explain what "buffer of line" is? I want to know if it is of
general usefulness.

---------------------------------------------------------------------------

Alex Shevlakov wrote:

New 'path' functions (test results can be found at http://motivation.ru/grass/buff_q_example.html):

There are not many (as my task was only limited to extending GRASS vector
capabilities to buffering):

/*check if a point is within buffer of line*/
Datum path_buffer_contain_pt(PG_FUNCTION_ARGS);

/*removes multiple repeated points from path*/
Datum path_without_doubles (PG_FUNCTION_ARGS);
static PATH * path_no_dbles(PATH *path);

/*returns closed path which is buffer to another path*/
Datum return_path_buffer(PG_FUNCTION_ARGS);

/*used to insert points along circle segment between two ends of non-intersecting buffer segments, smoothing the buffer*/
static Point * point_rotate (Point *lpoint, Point *ax_point, float ang,
int k, int n, int napr);

/*writes path to arcinfo UNGENERATE format which is particularly useful for viewing buffer in GRASS*/
Datum write_path_to_file(PG_FUNCTION_ARGS);
int write_path_to_file_internal(PATH *path, char *str );

/*generalize path,i.e., leave each third, or fourth, etc., point*/
Datum reduce_path_points(PG_FUNCTION_ARGS);
static PATH *path_reduce(PATH * path, int n_reduce);

On Tue, May 07, 2002 at 07:01:05AM -0700, Thomas Lockhart wrote:

I'd like to contribute new code for Postgres geometry type 'path' operations
(including line buffer). Where should I send this?

Send to pgsql-patches@postgresql.org. It may be helpful to (i.e. please
do) post a summary of what you are intending to send to this mailing
list so folks have an idea of what is coming...

Regards.

- Tom

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-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026

I am not sure that this has enough general interest to be included in
our code. If you make a loadable module, we can add it to our web site.

---------------------------------------------------------------------------

Alex Shevlakov wrote:

New 'path' functions (test results can be found at http://motivation.ru/grass/buff_q_example.html):

There are not many (as my task was only limited to extending GRASS vector
capabilities to buffering):

/*check if a point is within buffer of line*/
Datum path_buffer_contain_pt(PG_FUNCTION_ARGS);

/*removes multiple repeated points from path*/
Datum path_without_doubles (PG_FUNCTION_ARGS);
static PATH * path_no_dbles(PATH *path);

/*returns closed path which is buffer to another path*/
Datum return_path_buffer(PG_FUNCTION_ARGS);

/*used to insert points along circle segment between two ends of non-intersecting buffer segments, smoothing the buffer*/
static Point * point_rotate (Point *lpoint, Point *ax_point, float ang,
int k, int n, int napr);

/*writes path to arcinfo UNGENERATE format which is particularly useful for viewing buffer in GRASS*/
Datum write_path_to_file(PG_FUNCTION_ARGS);
int write_path_to_file_internal(PATH *path, char *str );

/*generalize path,i.e., leave each third, or fourth, etc., point*/
Datum reduce_path_points(PG_FUNCTION_ARGS);
static PATH *path_reduce(PATH * path, int n_reduce);

On Tue, May 07, 2002 at 07:01:05AM -0700, Thomas Lockhart wrote:

I'd like to contribute new code for Postgres geometry type 'path' operations
(including line buffer). Where should I send this?

Send to pgsql-patches@postgresql.org. It may be helpful to (i.e. please
do) post a summary of what you are intending to send to this mailing
list so folks have an idea of what is coming...

Regards.

- Tom

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-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026