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Commit006ad50

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Add spoly_is_convex
1 parent5228df6 commit006ad50

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8 files changed

+140
-2
lines changed

8 files changed

+140
-2
lines changed

‎doc/functions.sgm

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Original file line numberDiff line numberDiff line change
@@ -618,6 +618,33 @@
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</programlisting>
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</example>
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</sect3>
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<sect3 id="funcs.spoly.isconvex">
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<title>
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Spoly is convex
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</title>
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<para>
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Returns true if the specified spherical polygon is convex.
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Returns false otherwise.
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</para>
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<funcsynopsis>
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<funcprototype>
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<funcdef><function>spoly_is_convex</function></funcdef>
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<paramdef>spoly <parameter>polygon</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<example>
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<title>Check if polygon is convex</title>
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<programlisting>
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<![CDATA[sql> SELECT spoly_is_convex( spoly '{(0,0),(1,0),(1,1),(1,2)}' );]]>
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<![CDATA[ spoly_is_convex]]>
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<![CDATA[-----------------]]>
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<![CDATA[ t]]>
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<![CDATA[ (1 row)]]>
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</programlisting>
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</example>
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</sect3>
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</sect2>
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<sect2 id="funcs.sbox">

‎expected/init_test_healpix.out.in

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,2 +1,2 @@
1-
psql:pg_sphere.test.sql:9207: NOTICE: return type smoc is only a shell
2-
psql:pg_sphere.test.sql:9213: NOTICE: argument type smoc is only a shell
1+
psql:pg_sphere.test.sql:9221: NOTICE: return type smoc is only a shell
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psql:pg_sphere.test.sql:9227: NOTICE: argument type smoc is only a shell

‎expected/poly.out

Lines changed: 25 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1799,3 +1799,28 @@ SELECT spoly_as_array( spoly '{(0,0),(1,0),(1,1)}' );
17991799
{"(0 , 0)","(1 , 0)","(1 , 1)"}
18001800
(1 row)
18011801

1802+
-- spoly is convex
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SELECT spoly_is_convex(spoly'{(53d 45m 35.0s, 37d 6m 30.0s), (52d 21m 36.0s, 41d 36m 7.0s), (54d 14m 18.0s, 45d 1m 35.0s), (51d 23m 3.0s, 45d 22m 49.0s), (51d 2m 12.0s, 41d 52m 1.0s), (50d 41m 47.0s, 38d 22m 0s) }');
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spoly_is_convex
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-----------------
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f
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(1 row)
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SELECT spoly_is_convex(spoly'{(12d,32d),(34d,12d),(59d,21d),(69d,21d)}');
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spoly_is_convex
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-----------------
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f
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(1 row)
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SELECT spoly_is_convex(spoly'{(12d,32d),(34d,12d),(59d,21d),(34d,40d)}');
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spoly_is_convex
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-----------------
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t
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(1 row)
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SELECT spoly_is_convex(NULL);
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spoly_is_convex
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-----------------
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f
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(1 row)
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‎pgs_polygon.sql.in

Lines changed: 14 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -973,3 +973,17 @@ CREATE AGGREGATE spoly (
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stype = spoly,
974974
finalfunc = spoly_add_points_fin_aggr
975975
);
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--
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-- polygon is convex
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--
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CREATE FUNCTION spoly_is_convex(spoly)
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RETURNS BOOL
984+
AS 'MODULE_PATHNAME', 'spherepoly_is_convex'
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LANGUAGE 'c'
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IMMUTABLE PARALLEL SAFE;
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COMMENT ON FUNCTION spoly_is_convex(spoly) IS
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'true if spherical polygon is convex';

‎sql/poly.sql

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -616,3 +616,9 @@ SELECT spoint( spoly '{(0,0),(1,0),(1,1)}', 1 );
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SELECT spoint( spoly'{(0,0),(1,0),(1,1)}',2 );
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SELECT spoint( spoly'{(0,0),(1,0),(1,1)}',3 );
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SELECT spoly_as_array( spoly'{(0,0),(1,0),(1,1)}' );
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-- spoly is convex
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SELECT spoly_is_convex(spoly'{(53d 45m 35.0s, 37d 6m 30.0s), (52d 21m 36.0s, 41d 36m 7.0s), (54d 14m 18.0s, 45d 1m 35.0s), (51d 23m 3.0s, 45d 22m 49.0s), (51d 2m 12.0s, 41d 52m 1.0s), (50d 41m 47.0s, 38d 22m 0s) }');
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SELECT spoly_is_convex(spoly'{(12d,32d),(34d,12d),(59d,21d),(69d,21d)}');
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SELECT spoly_is_convex(spoly'{(12d,32d),(34d,12d),(59d,21d),(34d,40d)}');
624+
SELECT spoly_is_convex(NULL);

‎src/polygon.c

Lines changed: 52 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -59,6 +59,7 @@ PG_FUNCTION_INFO_V1(spheretrans_poly);
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PG_FUNCTION_INFO_V1(spheretrans_poly_inverse);
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PG_FUNCTION_INFO_V1(spherepoly_add_point);
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PG_FUNCTION_INFO_V1(spherepoly_add_points_finalize);
62+
PG_FUNCTION_INFO_V1(spherepoly_is_convex);
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6364

6465
/*
@@ -1531,3 +1532,54 @@ spherepoly_add_points_finalize(PG_FUNCTION_ARGS)
15311532
}
15321533
PG_RETURN_POINTER(poly);
15331534
}
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1537+
Datum
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spherepoly_is_convex(PG_FUNCTION_ARGS)
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{
1540+
Vector3Du,
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v,
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vsu,
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wsv,
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crs;
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int32i;
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float8cur=0.0,
1547+
prev=0.0;
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SPOLY*poly= (SPOLY*)PG_GETARG_POINTER(0);
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1550+
if (poly==NULL)
1551+
{
1552+
PG_RETURN_BOOL(false);
1553+
}
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poly=PG_GETARG_SPOLY(0);
1556+
if (poly->npts==3)
1557+
{
1558+
PG_RETURN_BOOL(true);
1559+
}
1560+
1561+
for (i=0;i<poly->npts;i++)
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{
1563+
constintj= (i-1+poly->npts) %poly->npts;
1564+
constintk= (i+1) %poly->npts;
1565+
1566+
spoint_vector3d(&u,&poly->p[i]);
1567+
spoint_vector3d(&v,&poly->p[j]);
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spoint_vector3d(&vsu,&poly->p[j]);
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spoint_vector3d(&wsv,&poly->p[k]);
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vector3d_addwithscalar(&vsu,-1,&u);
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vector3d_addwithscalar(&wsv,-1,&v);
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vector3d_cross(&crs,&vsu,&wsv);
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cur=vector3d_scalar(&crs,&v);
1577+
if (cur*prev<0)
1578+
{
1579+
PG_RETURN_BOOL(false);
1580+
}
1581+
prev=cur;
1582+
}
1583+
1584+
PG_RETURN_BOOL(true);
1585+
}

‎src/polygon.h

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -358,4 +358,9 @@ Datumspherepoly_add_points_finalize(PG_FUNCTION_ARGS);
358358
*/
359359
Datumspherepoly_get_array(PG_FUNCTION_ARGS);
360360

361+
/*
362+
* Checks whether a polygon is convex
363+
*/
364+
Datumspherepoly_is_convex(PG_FUNCTION_ARGS);
365+
361366
#endif

‎upgrade_scripts/pg_sphere--1.2.3--1.3.0.sql.in

Lines changed: 9 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -54,3 +54,12 @@ CREATE FUNCTION spoly_as_array(spoly)
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5555
COMMENT ON FUNCTION spoly_as_array(spoly) IS
5656
'returns spoly as array of points';
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58+
CREATE FUNCTION spoly_is_convex(spoly)
59+
RETURNS BOOL
60+
AS 'MODULE_PATHNAME', 'spherepoly_is_convex'
61+
LANGUAGE 'c'
62+
IMMUTABLE PARALLEL SAFE;
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64+
COMMENT ON FUNCTION spoly_is_convex(spoly) IS
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'true if spherical polygon is convex';

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