<?xml version="1.0" encoding="UTF-8"?>
<sect1 id="Affine_Transformation">
<sect1info>
<abstract>
<para>These functions change the position and shape of geometries using
<ulink url="https://en.wikipedia.org/wiki/Affine_transformation">affine transformations</ulink>.</para>
</abstract>
</sect1info>
<title>Affine Transformations</title>
<refentry id="ST_Affine">
<refnamediv>
<refname>ST_Affine</refname>
<refpurpose>Apply a 3D affine transformation to a geometry.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcprototype>
<funcdef>geometry <function>ST_Affine</function></funcdef>
<paramdef><type>geometry </type> <parameter>geomA</parameter></paramdef>
<paramdef><type>float </type> <parameter>a</parameter></paramdef>
<paramdef><type>float </type> <parameter>b</parameter></paramdef>
<paramdef><type>float </type> <parameter>c</parameter></paramdef>
<paramdef><type>float </type> <parameter>d</parameter></paramdef>
<paramdef><type>float </type> <parameter>e</parameter></paramdef>
<paramdef><type>float </type> <parameter>f</parameter></paramdef>
<paramdef><type>float </type> <parameter>g</parameter></paramdef>
<paramdef><type>float </type> <parameter>h</parameter></paramdef>
<paramdef><type>float </type> <parameter>i</parameter></paramdef>
<paramdef><type>float </type> <parameter>xoff</parameter></paramdef>
<paramdef><type>float </type> <parameter>yoff</parameter></paramdef>
<paramdef><type>float </type> <parameter>zoff</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>geometry <function>ST_Affine</function></funcdef>
<paramdef><type>geometry </type> <parameter>geomA</parameter></paramdef>
<paramdef><type>float </type> <parameter>a</parameter></paramdef>
<paramdef><type>float </type> <parameter>b</parameter></paramdef>
<paramdef><type>float </type> <parameter>d</parameter></paramdef>
<paramdef><type>float </type> <parameter>e</parameter></paramdef>
<paramdef><type>float </type> <parameter>xoff</parameter></paramdef>
<paramdef><type>float </type> <parameter>yoff</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsection>
<title>Description</title>
<para>Applies a 3D affine transformation to the geometry to do things like translate, rotate, scale in one step.</para>
<para>
Version 1: The
call <programlisting>ST_Affine(geom, a, b, c, d, e, f, g, h, i, xoff, yoff, zoff) </programlisting>
represents the transformation matrix <programlisting>/ a b c xoff \
| d e f yoff |
| g h i zoff |
\ 0 0 0 1 /</programlisting> and the vertices are transformed as
follows: <programlisting>x' = a*x + b*y + c*z + xoff
y' = d*x + e*y + f*z + yoff
z' = g*x + h*y + i*z + zoff</programlisting> All of the translate / scale
functions below are expressed via such an affine
transformation.</para>
<para>Version 2: Applies a 2d affine transformation to the geometry. The
call <programlisting>ST_Affine(geom, a, b, d, e, xoff, yoff)</programlisting>
represents the transformation matrix <programlisting>/ a b 0 xoff \ / a b xoff \
| d e 0 yoff | rsp. | d e yoff |
| 0 0 1 0 | \ 0 0 1 /
\ 0 0 0 1 /</programlisting> and the vertices are transformed as
follows: <programlisting>x' = a*x + b*y + xoff
y' = d*x + e*y + yoff
z' = z </programlisting> This method is a subcase of the 3D method
above.</para>
<para>Enhanced: 2.0.0 support for Polyhedral surfaces, Triangles and TIN was introduced.</para>
<para>Availability: 1.1.2. Name changed from Affine to ST_Affine in 1.2.2</para>
<note><para>Prior to 1.3.4, this function crashes if used with geometries that contain CURVES. This is fixed in 1.3.4+</para></note>
<para>&P_support;</para>
<para>&T_support;</para>
<para>&Z_support;</para>
<para>&curve_support;</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting>
--Rotate a 3d line 180 degrees about the z axis. Note this is long-hand for doing ST_Rotate();
SELECT ST_AsEWKT(ST_Affine(geom, cos(pi()), -sin(pi()), 0, sin(pi()), cos(pi()), 0, 0, 0, 1, 0, 0, 0)) As using_affine,
ST_AsEWKT(ST_Rotate(geom, pi())) As using_rotate
FROM (SELECT ST_GeomFromEWKT('LINESTRING(1 2 3, 1 4 3)') As geom) As foo;
using_affine | using_rotate
-----------------------------+-----------------------------
LINESTRING(-1 -2 3,-1 -4 3) | LINESTRING(-1 -2 3,-1 -4 3)
(1 row)
--Rotate a 3d line 180 degrees in both the x and z axis
SELECT ST_AsEWKT(ST_Affine(geom, cos(pi()), -sin(pi()), 0, sin(pi()), cos(pi()), -sin(pi()), 0, sin(pi()), cos(pi()), 0, 0, 0))
FROM (SELECT ST_GeomFromEWKT('LINESTRING(1 2 3, 1 4 3)') As geom) As foo;
st_asewkt
-------------------------------
LINESTRING(-1 -2 -3,-1 -4 -3)
(1 row)
</programlisting>
</refsection>
<refsection>
<title>See Also</title>
<para><xref linkend="ST_Rotate" />, <xref linkend="ST_Scale" />, <xref linkend="ST_Translate" />, <xref linkend="ST_TransScale" /></para>
</refsection>
</refentry>
<refentry id="ST_Rotate">
<refnamediv>
<refname>ST_Rotate</refname>
<refpurpose>Rotates a geometry about an origin point.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcprototype>
<funcdef>geometry <function>ST_Rotate</function></funcdef>
<paramdef><type>geometry</type> <parameter>geomA</parameter></paramdef>
<paramdef><type>float</type> <parameter>rotRadians</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>geometry <function>ST_Rotate</function></funcdef>
<paramdef><type>geometry</type> <parameter>geomA</parameter></paramdef>
<paramdef><type>float</type> <parameter>rotRadians</parameter></paramdef>
<paramdef><type>float</type> <parameter>x0</parameter></paramdef>
<paramdef><type>float</type> <parameter>y0</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>geometry <function>ST_Rotate</function></funcdef>
<paramdef><type>geometry</type> <parameter>geomA</parameter></paramdef>
<paramdef><type>float</type> <parameter>rotRadians</parameter></paramdef>
<paramdef><type>geometry</type> <parameter>pointOrigin</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsection>
<title>Description</title>
<para>Rotates geometry rotRadians counter-clockwise about the origin point. The rotation origin can be
specified either as a POINT geometry, or as x and y coordinates. If the origin is not
specified, the geometry is rotated about POINT(0 0).</para>
<para>Enhanced: 2.0.0 support for Polyhedral surfaces, Triangles and TIN was introduced.</para>
<para>Enhanced: 2.0.0 additional parameters for specifying the origin of rotation were added.</para>
<para>Availability: 1.1.2. Name changed from Rotate to ST_Rotate in 1.2.2</para>
<para>&Z_support;</para>
<para>&curve_support;</para>
<para>&P_support;</para>
<para>&T_support;</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting>
--Rotate 180 degrees
SELECT ST_AsEWKT(ST_Rotate('LINESTRING (50 160, 50 50, 100 50)', pi()));
st_asewkt
---------------------------------------
LINESTRING(-50 -160,-50 -50,-100 -50)
(1 row)
--Rotate 30 degrees counter-clockwise at x=50, y=160
SELECT ST_AsEWKT(ST_Rotate('LINESTRING (50 160, 50 50, 100 50)', pi()/6, 50, 160));
st_asewkt
---------------------------------------------------------------------------
LINESTRING(50 160,105 64.7372055837117,148.301270189222 89.7372055837117)
(1 row)
--Rotate 60 degrees clockwise from centroid
SELECT ST_AsEWKT(ST_Rotate(geom, -pi()/3, ST_Centroid(geom)))
FROM (SELECT 'LINESTRING (50 160, 50 50, 100 50)'::geometry AS geom) AS foo;
st_asewkt
--------------------------------------------------------------
LINESTRING(116.4225 130.6721,21.1597 75.6721,46.1597 32.3708)
(1 row)
</programlisting>
</refsection>
<refsection>
<title>See Also</title>
<para><xref linkend="ST_Affine" />, <xref linkend="ST_RotateX" />, <xref linkend="ST_RotateY" />, <xref linkend="ST_RotateZ" /></para>
</refsection>
</refentry>
<refentry id="ST_RotateX">
<refnamediv>
<refname>ST_RotateX</refname>
<refpurpose>Rotates a geometry about the X axis.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcprototype>
<funcdef>geometry <function>ST_RotateX</function></funcdef>
<paramdef><type>geometry</type> <parameter>geomA</parameter></paramdef>
<paramdef><type>float</type> <parameter>rotRadians</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsection>
<title>Description</title>
<para>Rotates a geometry geomA - rotRadians about the X axis.</para>
<note><para><code>ST_RotateX(geomA, rotRadians)</code>
is short-hand for <code>ST_Affine(geomA, 1, 0, 0, 0, cos(rotRadians), -sin(rotRadians), 0, sin(rotRadians), cos(rotRadians), 0, 0, 0)</code>.</para></note>
<para>Enhanced: 2.0.0 support for Polyhedral surfaces, Triangles and TIN was introduced.</para>
<para>Availability: 1.1.2. Name changed from RotateX to ST_RotateX in 1.2.2</para>
<para>&P_support;</para>
<para>&Z_support;</para>
<para>&T_support;</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting>
--Rotate a line 90 degrees along x-axis
SELECT ST_AsEWKT(ST_RotateX(ST_GeomFromEWKT('LINESTRING(1 2 3, 1 1 1)'), pi()/2));
st_asewkt
---------------------------
LINESTRING(1 -3 2,1 -1 1)
</programlisting>
</refsection>
<refsection>
<title>See Also</title>
<para><xref linkend="ST_Affine" />, <xref linkend="ST_RotateY" />, <xref linkend="ST_RotateZ" /></para>
</refsection>
</refentry>
<refentry id="ST_RotateY">
<refnamediv>
<refname>ST_RotateY</refname>
<refpurpose>Rotates a geometry about the Y axis.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcprototype>
<funcdef>geometry <function>ST_RotateY</function></funcdef>
<paramdef><type>geometry</type> <parameter>geomA</parameter></paramdef>
<paramdef><type>float</type> <parameter>rotRadians</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsection>
<title>Description</title>
<para>Rotates a geometry geomA - rotRadians about the y axis.</para>
<note><para><code>ST_RotateY(geomA, rotRadians)</code>
is short-hand for <code>ST_Affine(geomA, cos(rotRadians), 0, sin(rotRadians), 0, 1, 0, -sin(rotRadians), 0, cos(rotRadians), 0, 0, 0)</code>.</para></note>
<para>Availability: 1.1.2. Name changed from RotateY to ST_RotateY in 1.2.2</para>
<para>Enhanced: 2.0.0 support for Polyhedral surfaces, Triangles and TIN was introduced.</para>
<para>&P_support;</para>
<para>&Z_support;</para>
<para>&T_support;</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting>
--Rotate a line 90 degrees along y-axis
SELECT ST_AsEWKT(ST_RotateY(ST_GeomFromEWKT('LINESTRING(1 2 3, 1 1 1)'), pi()/2));
st_asewkt
---------------------------
LINESTRING(3 2 -1,1 1 -1)
</programlisting>
</refsection>
<refsection>
<title>See Also</title>
<para><xref linkend="ST_Affine" />, <xref linkend="ST_RotateX" />, <xref linkend="ST_RotateZ" /></para>
</refsection>
</refentry>
<refentry id="ST_RotateZ">
<refnamediv>
<refname>ST_RotateZ</refname>
<refpurpose>Rotates a geometry about the Z axis.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcprototype>
<funcdef>geometry <function>ST_RotateZ</function></funcdef>
<paramdef><type>geometry</type> <parameter>geomA</parameter></paramdef>
<paramdef><type>float</type> <parameter>rotRadians</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsection>
<title>Description</title>
<para>Rotates a geometry geomA - rotRadians about the Z axis.</para>
<note><para>This is a synonym for ST_Rotate</para></note>
<note><para><code>ST_RotateZ(geomA, rotRadians)</code>
is short-hand for <code>SELECT ST_Affine(geomA, cos(rotRadians), -sin(rotRadians), 0, sin(rotRadians), cos(rotRadians), 0, 0, 0, 1, 0, 0, 0)</code>.</para></note>
<para>Enhanced: 2.0.0 support for Polyhedral surfaces, Triangles and TIN was introduced.</para>
<para>Availability: 1.1.2. Name changed from RotateZ to ST_RotateZ in 1.2.2</para>
<note><para>Prior to 1.3.4, this function crashes if used with geometries that contain CURVES. This is fixed in 1.3.4+</para></note>
<para>&Z_support;</para>
<para>&curve_support;</para>
<para>&P_support;</para>
<para>&T_support;</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting>
--Rotate a line 90 degrees along z-axis
SELECT ST_AsEWKT(ST_RotateZ(ST_GeomFromEWKT('LINESTRING(1 2 3, 1 1 1)'), pi()/2));
st_asewkt
---------------------------
LINESTRING(-2 1 3,-1 1 1)
--Rotate a curved circle around z-axis
SELECT ST_AsEWKT(ST_RotateZ(geom, pi()/2))
FROM (SELECT ST_LineToCurve(ST_Buffer(ST_GeomFromText('POINT(234 567)'), 3)) As geom) As foo;
st_asewkt
----------------------------------------------------------------------------------------------------------------------------
CURVEPOLYGON(CIRCULARSTRING(-567 237,-564.87867965644 236.12132034356,-564 234,-569.12132034356 231.87867965644,-567 237))
</programlisting>
</refsection>
<refsection>
<title>See Also</title>
<para><xref linkend="ST_Affine" />, <xref linkend="ST_RotateX" />, <xref linkend="ST_RotateY" /></para>
</refsection>
</refentry>
<refentry id="ST_Scale">
<refnamediv>
<refname>ST_Scale</refname>
<refpurpose>Scales a geometry by given factors.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcprototype>
<funcdef>geometry <function>ST_Scale</function></funcdef>
<paramdef><type>geometry </type> <parameter>geomA</parameter></paramdef>
<paramdef><type>float</type> <parameter>XFactor</parameter></paramdef>
<paramdef><type>float</type> <parameter>YFactor</parameter></paramdef>
<paramdef><type>float</type> <parameter>ZFactor</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>geometry <function>ST_Scale</function></funcdef>
<paramdef><type>geometry </type> <parameter>geomA</parameter></paramdef>
<paramdef><type>float</type> <parameter>XFactor</parameter></paramdef>
<paramdef><type>float</type> <parameter>YFactor</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>geometry <function>ST_Scale</function></funcdef>
<paramdef><type>geometry </type> <parameter>geom</parameter></paramdef>
<paramdef><type>geometry</type> <parameter>factor</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>geometry <function>ST_Scale</function></funcdef>
<paramdef><type>geometry </type> <parameter>geom</parameter></paramdef>
<paramdef><type>geometry</type> <parameter>factor</parameter></paramdef>
<paramdef><type>geometry</type> <parameter>origin</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsection>
<title>Description</title>
<para>Scales the geometry to a new size by multiplying the
ordinates with the corresponding factor parameters.
</para>
<para>
The version taking a geometry as the <varname>factor</varname> parameter
allows passing a 2d, 3dm, 3dz or 4d point to set scaling factor for all
supported dimensions. Missing dimensions in the <varname>factor</varname>
point are equivalent to no scaling the corresponding dimension.
</para>
<para>
The three-geometry variant allows a "false origin" for the scaling to be passed in. This allows "scaling in place", for example using the centroid of the geometry as the false origin. Without a false origin, scaling takes place relative to the actual origin, so all coordinates are just multipled by the scale factor.
</para>
<note><para>Prior to 1.3.4, this function crashes if used with geometries that contain CURVES. This is fixed in 1.3.4+</para></note>
<para>Availability: 1.1.0.</para>
<para>Enhanced: 2.0.0 support for Polyhedral surfaces, Triangles and TIN was introduced.</para>
<para>Enhanced: 2.2.0 support for scaling all dimension (<varname>factor</varname> parameter) was introduced.</para>
<para>Enhanced: 2.5.0 support for scaling relative to a local origin (<varname>origin</varname> parameter) was introduced.</para>
<para>&P_support;</para>
<para>&Z_support;</para>
<para>&curve_support;</para>
<para>&T_support;</para>
<para>&M_support;</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting>--Version 1: scale X, Y, Z
SELECT ST_AsEWKT(ST_Scale(ST_GeomFromEWKT('LINESTRING(1 2 3, 1 1 1)'), 0.5, 0.75, 0.8));
st_asewkt
--------------------------------------
LINESTRING(0.5 1.5 2.4,0.5 0.75 0.8)
--Version 2: Scale X Y
SELECT ST_AsEWKT(ST_Scale(ST_GeomFromEWKT('LINESTRING(1 2 3, 1 1 1)'), 0.5, 0.75));
st_asewkt
----------------------------------
LINESTRING(0.5 1.5 3,0.5 0.75 1)
--Version 3: Scale X Y Z M
SELECT ST_AsEWKT(ST_Scale(ST_GeomFromEWKT('LINESTRING(1 2 3 4, 1 1 1 1)'),
ST_MakePoint(0.5, 0.75, 2, -1)));
st_asewkt
----------------------------------------
LINESTRING(0.5 1.5 6 -4,0.5 0.75 2 -1)
--Version 4: Scale X Y using false origin
SELECT ST_AsText(ST_Scale('LINESTRING(1 1, 2 2)', 'POINT(2 2)', 'POINT(1 1)'::geometry));
st_astext
---------------------
LINESTRING(1 1,3 3)
</programlisting>
</refsection>
<refsection>
<title>See Also</title>
<para><xref linkend="ST_Affine" />, <xref linkend="ST_TransScale" /></para>
</refsection>
</refentry>
<refentry id="ST_Translate">
<refnamediv>
<refname>ST_Translate</refname>
<refpurpose>Translates a geometry by given offsets.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcprototype>
<funcdef>geometry <function>ST_Translate</function></funcdef>
<paramdef><type>geometry </type> <parameter>g1</parameter></paramdef>
<paramdef><type>float </type> <parameter>deltax</parameter></paramdef>
<paramdef><type>float </type> <parameter>deltay</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>geometry <function>ST_Translate</function></funcdef>
<paramdef><type>geometry </type> <parameter>g1</parameter></paramdef>
<paramdef><type>float </type> <parameter>deltax</parameter></paramdef>
<paramdef><type>float </type> <parameter>deltay</parameter></paramdef>
<paramdef><type>float </type> <parameter>deltaz</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsection>
<title>Description</title>
<para>Returns a new geometry whose coordinates are translated delta x,delta y,delta z units. Units are
based on the units defined in spatial reference (SRID) for this geometry.</para>
<note><para>Prior to 1.3.4, this function crashes if used with geometries that contain CURVES. This is fixed in 1.3.4+</para></note>
<para>Availability: 1.2.2</para>
<para>&Z_support;</para>
<para>&curve_support;</para>
</refsection>
<refsection>
<title>Examples</title>
<para>Move a point 1 degree longitude</para>
<programlisting>
SELECT ST_AsText(ST_Translate(ST_GeomFromText('POINT(-71.01 42.37)',4326),1,0)) As wgs_transgeomtxt;
wgs_transgeomtxt
---------------------
POINT(-70.01 42.37)
</programlisting>
<para>Move a linestring 1 degree longitude and 1/2 degree latitude</para>
<programlisting>SELECT ST_AsText(ST_Translate(ST_GeomFromText('LINESTRING(-71.01 42.37,-71.11 42.38)',4326),1,0.5)) As wgs_transgeomtxt;
wgs_transgeomtxt
---------------------------------------
LINESTRING(-70.01 42.87,-70.11 42.88)
</programlisting>
<para>Move a 3d point</para>
<programlisting>SELECT ST_AsEWKT(ST_Translate(CAST('POINT(0 0 0)' As geometry), 5, 12,3));
st_asewkt
---------
POINT(5 12 3)
</programlisting>
<para>Move a curve and a point</para>
<programlisting>SELECT ST_AsText(ST_Translate(ST_Collect('CURVEPOLYGON(CIRCULARSTRING(4 3,3.12 0.878,1 0,-1.121 5.1213,6 7, 8 9,4 3))','POINT(1 3)'),1,2));
st_astext
------------------------------------------------------------------------------------------------------------
GEOMETRYCOLLECTION(CURVEPOLYGON(CIRCULARSTRING(5 5,4.12 2.878,2 2,-0.121 7.1213,7 9,9 11,5 5)),POINT(2 5))
</programlisting>
</refsection>
<refsection>
<title>See Also</title>
<para><xref linkend="ST_Affine" />, <xref linkend="ST_AsText" />, <xref linkend="ST_GeomFromText" /></para>
</refsection>
</refentry>
<refentry id="ST_TransScale">
<refnamediv>
<refname>ST_TransScale</refname>
<refpurpose>Translates and scales a geometry by given offsets and factors.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcprototype>
<funcdef>geometry <function>ST_TransScale</function></funcdef>
<paramdef><type>geometry </type> <parameter>geomA</parameter></paramdef>
<paramdef><type>float</type> <parameter>deltaX</parameter></paramdef>
<paramdef><type>float</type> <parameter>deltaY</parameter></paramdef>
<paramdef><type>float</type> <parameter>XFactor</parameter></paramdef>
<paramdef><type>float</type> <parameter>YFactor</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsection>
<title>Description</title>
<para>Translates the geometry using the deltaX and deltaY args,
then scales it using the XFactor, YFactor args, working in 2D only.</para>
<note><para><code>ST_TransScale(geomA, deltaX, deltaY, XFactor, YFactor)</code>
is short-hand for <code>ST_Affine(geomA, XFactor, 0, 0, 0, YFactor, 0,
0, 0, 1, deltaX*XFactor, deltaY*YFactor, 0)</code>.</para></note>
<note><para>Prior to 1.3.4, this function crashes if used with geometries that contain CURVES. This is fixed in 1.3.4+</para></note>
<para>Availability: 1.1.0.</para>
<para>&Z_support;</para>
<para>&curve_support;</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting>SELECT ST_AsEWKT(ST_TransScale(ST_GeomFromEWKT('LINESTRING(1 2 3, 1 1 1)'), 0.5, 1, 1, 2));
st_asewkt
-----------------------------
LINESTRING(1.5 6 3,1.5 4 1)
--Buffer a point to get an approximation of a circle, convert to curve and then translate 1,2 and scale it 3,4
SELECT ST_AsText(ST_Transscale(ST_LineToCurve(ST_Buffer('POINT(234 567)', 3)),1,2,3,4));
st_astext
------------------------------------------------------------------------------------------------------------------------------
CURVEPOLYGON(CIRCULARSTRING(714 2276,711.363961030679 2267.51471862576,705 2264,698.636038969321 2284.48528137424,714 2276))
</programlisting>
</refsection>
<refsection>
<title>See Also</title>
<para><xref linkend="ST_Affine" />, <xref linkend="ST_Translate" /></para>
</refsection>
</refentry>
</sect1>