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<?xml version="1.0" encoding="UTF-8"?>
<!--
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
* Copyright (C) ENPC - Jean-Philippe Chancelier
*
* This file must be used under the terms of the CeCILL.
* This source file is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at
* http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
*
-->
<refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:svg="http://www.w3.org/2000/svg" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" xmlns:scilab="http://www.scilab.org" xml:lang="en" xml:id="xchange">
<refnamediv>
<refname>xchange</refname>
<refpurpose>transform real to pixel coordinates</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>[x1, y1, rect] = xchange(x, y, dir)</synopsis>
</refsynopsisdiv>
<refsection>
<title>Arguments</title>
<variablelist>
<varlistentry>
<term>x, y</term>
<listitem>
<para>
two matrices of size <literal>(n1, n2)</literal>
(coordinates of a set of points).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>dir</term>
<listitem>
<para>
a string, parameter used to specify the conversion type
(See "Description" for details).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>x1, y1</term>
<listitem>
<para>
two matrices of size <literal>(n1, n2)</literal>
(coordinates of the set of points).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>rect</term>
<listitem>
<para>a vector of size 4.</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
After having used a graphics function, <function>xchange</function>
computes pixel coordinates from real coordinates and conversely,
according to the value of the parameter <varname>dir</varname>:
<literal>"f2i"</literal> (float to int) means real to pixel and
<literal>"i2f"</literal> (int to float) means pixel to real.
</para>
<para>
<varname>x1</varname> and <varname>y1</varname> are the new
coordinates of the set of points defined by the old coordinates
<varname>x</varname> and <varname>y</varname>.
</para>
<para>
<varname>rect</varname> is the coordinates in pixel of the rectangle
in which the plot was done: <literal>[upper-left point, width, height]</literal>.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
t=[0:0.1:2*%pi]';
plot2d(t,sin(t))
[x,y,rect]=xchange(1,1,"f2i")
[x,y,rect]=xchange(0,0,"i2f")
]]></programlisting>
</refsection>
</refentry>
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