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Revive line type

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Change the input/output format to {A,B,C}, to match the internal
representation.

Complete the implementations of line_in, line_out, line_recv, line_send.
Remove comments and error messages about the line type not being
implemented.  Add regression tests for existing line operators and
functions.

Reviewed-by: rui hua <365507506hua@gmail.com>
Reviewed-by: Álvaro Herrera <alvherre@2ndquadrant.com>
Reviewed-by: Jeevan Chalke <jeevan.chalke@enterprisedb.com>
This commit is contained in:
Peter Eisentraut
2013-10-09 01:09:18 -04:00
parent 0ac5e5a7e1
commit 261c7d4b65
13 changed files with 503 additions and 153 deletions
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42
doc/src/sgml/datatype.sgml
View File

@ -3051,9 +3051,7 @@ SELECT person.name, holidays.num_weeks FROM person, holidays
<para>
Geometric data types represent two-dimensional spatial
objects. <xref linkend="datatype-geo-table"> shows the geometric
types available in <productname>PostgreSQL</productname>. The
most fundamental type, the point, forms the basis for all of the
other types.
types available in <productname>PostgreSQL</productname>.
</para>
<table id="datatype-geo-table">
@ -3063,8 +3061,8 @@ SELECT person.name, holidays.num_weeks FROM person, holidays
<row>
<entry>Name</entry>
<entry>Storage Size</entry>
<entry>Representation</entry>
<entry>Description</entry>
<entry>Representation</entry>
</row>
</thead>
<tbody>
@ -3077,8 +3075,8 @@ SELECT person.name, holidays.num_weeks FROM person, holidays
<row>
<entry><type>line</type></entry>
<entry>32 bytes</entry>
<entry>Infinite line (not fully implemented)</entry>
<entry>((x1,y1),(x2,y2))</entry>
<entry>Infinite line</entry>
<entry>{A,B,C}</entry>
</row>
<row>
<entry><type>lseg</type></entry>
@ -3152,6 +3150,38 @@ SELECT person.name, holidays.num_weeks FROM person, holidays
</para>
</sect2>
<sect2>
<title>Lines</title>
<indexterm>
<primary>line</primary>
</indexterm>
<para>
Lines (<type>line</type>) are represented by the linear equation Ax + By
+ C = 0, where A and B are not both zero. Values of
type <type>line</type> is input and output in the following form:
<synopsis>
{ <replaceable>A</replaceable>, <replaceable>B</replaceable>, <replaceable>C</replaceable> }
</synopsis>
Alternatively, any of the following forms can be used for input:
<synopsis>
[ ( <replaceable>x1</replaceable> , <replaceable>y1</replaceable> ) , ( <replaceable>x2</replaceable> , <replaceable>y2</replaceable> ) ]
( ( <replaceable>x1</replaceable> , <replaceable>y1</replaceable> ) , ( <replaceable>x2</replaceable> , <replaceable>y2</replaceable> ) )
( <replaceable>x1</replaceable> , <replaceable>y1</replaceable> ) , ( <replaceable>x2</replaceable> , <replaceable>y2</replaceable> )
<replaceable>x1</replaceable> , <replaceable>y1</replaceable> , <replaceable>x2</replaceable> , <replaceable>y2</replaceable>
</synopsis>
where
<literal>(<replaceable>x1</replaceable>,<replaceable>y1</replaceable>)</literal>
and
<literal>(<replaceable>x2</replaceable>,<replaceable>y2</replaceable>)</literal>
are two (different) points on the line.
</para>
</sect2>
<sect2>
<title>Line Segments</title>

6
doc/src/sgml/func.sgml
View File

@ -8122,6 +8122,12 @@ CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple
<entry>polygon to circle</entry>
<entry><literal>circle(polygon '((0,0),(1,1),(2,0))')</literal></entry>
</row>
<row>
<entry><literal><function>line(<type>point</type>, <type>point</type>)</function></literal></entry>
<entry><type>line</type></entry>
<entry>points to line</entry>
<entry><literal>line(point '(-1,0)', point '(1,0)')</literal></entry>
</row>
<row>
<entry>
<indexterm>