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<html>
<head>
<title>
XY_IO - XY File Input/Output routines.
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
XY_IO <br> XY File Input/Output routines.
</h1>
<hr>
<p>
<b>XY_IO</b>
is a FORTRAN90 library which
reads and writes files in the XY, XYL and XYF formats.
</p>
<p>
XY files are a simple way of storing information about sets of points in 2D.
</p>
<p>
An XY file has a simple structure. There are three kinds of records:
<ul>
<li>
COMMENT LINES begin with the character '#' and are ignored;
</li>
<li>
BLANK LINES are ignored;
</li>
<li>
COORDINATE LINES each contain one pair of X, Y coordinates;
</li>
</ul>
</p>
<p>
Here is an example of an XY file containing 13 points:
<pre>
# house.xy
#
0.000000 0.000000
6.000000 0.000000
6.000000 7.000000
3.000000 10.000000
0.000000 7.000000
4.000000 1.000000
5.000000 1.000000
5.000000 4.000000
4.000000 4.000000
5.000000 8.000000
5.000000 11.000000
4.000000 11.000000
4.000000 9.000000
</pre>
</p>
<p>
Of course, in many cases, we would like to describe LINES between the points.
We can add this information by including a second file, called an XYL file,
which consists of a string of point indices. A line is drawn from one point
to the next and so on. Each list of points is on a separate record. Thus, an XYL file
associated with the above XY file might be:
<pre>
# house.xyl
#
1 2 3 4 5 1
6 7 8 9 6
10 11 12 13
</pre>
</p>
<p>
We might also like to describe FACES defined by the points.
We can add this information by including a file, called an XYF file,
which consists of a string of point indices. A face is defined by
listing in counterclockwise order the vertices that lie on it.
No terminating "-1" is needed, and the first vertex is not repeated
as the final vertex. Thus, an XYF file
associated with the above XY file might be:
<pre>
# house.xyf
#
1 2 3 4 5
6 7 8 9
10 11 12 13
</pre>
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and made available on this web page
are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>XY_IO</b> is available in
<a href = "../../cpp_src/xy_io/xy_io.html">a C++ version</a> and
<a href = "../../f_src/xy_io/xy_io.html">a FORTRAN90 version</a> and
<a href = "../../m_src/xy_io/xy_io.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../f_src/circle_points/circle_points.html">
CIRCLE_POINTS</a>,
a FORTRAN90 program which
computes points equally spaced on a circular arc, and writes them to an XY file;
</p>
<p>
<a href = "../../f_src/grf_to_xyl/grf_to_xyl.html">
GRF_TO_XYL</a>,
a FORTRAN90 program which
converts information describing the adjacency and embedding of an
abstract graph from GRF to XYL format.
</p>
<p>
<a href = "../../data/table/table.html">
TABLE</a>,
a data directory which
contains examples of TABLE files,
a simple format for N points in M dimensions;
</p>
<p>
<a href = "../../data/xy/xy.html">
XY</a>,
a data directory which
contains examples of XY files,
a simple 2D graphics point format;
</p>
<p>
<a href = "../../m_src/xy_display/xy_display.html">
XY_DISPLAY</a>,
a MATLAB program which
reads an XY file containing
the coordinates of points in 2D, and displays a plot of the
points in a MATLAB graphics window;
</p>
<p>
<a href = "../../cpp_src/xy_display_opengl/xy_display_opengl.html">
XY_DISPLAY_OPENGL</a>,
a C++ program which
reads an XY file of 2D point coordinates, and displays
an image of those points using OpenGL.
</p>
<p>
<a href = "../../data/xyf/xyf.html">
XYF</a>,
a data directory which
contains examples of XYF files,
a simple 2D graphics point and face format;
</p>
<p>
<a href = "../../m_src/xyf_display/xyf_display.html">
XYF_DISPLAY</a>,
a MATLAB program which
reads XYF information defining points and faces in 2D, and displays
an image using MATLAB.
</p>
<p>
<a href = "../../cpp_src/xyf_display_opengl/xyf_display_opengl.html">
XYF_DISPLAY_OPENGL</a>,
a C++ program which
reads XYF information defining points and faces in 2D, and displays
an image using OpenGL.
</p>
<p>
<a href = "../../data/xyl/xyl.html">
XYL</a>,
a data directory which
contains examples of XYL files,
a simple 2D graphics point and line format;
</p>
<p>
<a href = "../../m_src/xyl_display/xyl_display.html">
XYL_DISPLAY</a>,
a MATLAB program which
reads XYL information defining points and lines in 2D, and displays
an image using MATLAB.
</p>
<p>
<a href = "../../cpp_src/xyl_display_opengl/xyl_display_opengl.html">
XYL_DISPLAY_OPENGL</a>,
a C++ program which
reads XYL information defining points and lines in 2D, and displays
an image using OpenGL.
</p>
<p>
<a href = "../../f_src/xyz_io/xyz_io.html">
XYZ_IO</a>,
a FORTRAN90 library which
reads and writes XYZ files, a simple 3D graphics point format.
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "xy_io.f90">xy_io.f90</a>, the source code.
</li>
<li>
<a href = "xy_io.sh">xy_io.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "xy_io_prb.f90">xy_io_prb.f90</a>,
a sample calling program.
</li>
<li>
<a href = "xy_io_prb.sh">xy_io_prb.sh</a>,
commands to compile and run the sample program.
</li>
<li>
<a href = "xy_io_prb_output.txt">xy_io_prb_output.txt</a>,
the output file.
</li>
<li>
<a href = "xy_io_prb_01.xy">xy_io_prb_01.xy</a>,
an XY file created by the example program.
</li>
<li>
<a href = "xy_io_prb_02.xy">xy_io_prb_02.xy</a>,
an XY file created by the example program.
</li>
<li>
<a href = "house.xy">house.xy</a>,
an XY file of points created by the example program.
</li>
<li>
<a href = "house.xyl">house.xyl</a>,
an XYL file of lines created by the example program.
</li>
<li>
<a href = "annulus.xy">annulus.xy</a>,
an XY file of points created by the example program.
</li>
<li>
<a href = "annulus.xyf">annulus.xyf</a>,
an XYF file of lines created by the example program.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>CH_CAP</b> capitalizes a single character.
</li>
<li>
<b>CH_EQI</b> is a case insensitive comparison of two characters for equality.
</li>
<li>
<b>CH_TO_DIGIT</b> returns the integer value of a base 10 digit.
</li>
<li>
<b>GET_UNIT</b> returns a free FORTRAN unit number.
</li>
<li>
<b>S_TO_I4</b> reads an integer value from a string.
</li>
<li>
<b>S_TO_I4VEC</b> reads an integer vector from a string.
</li>
<li>
<b>S_TO_R8</b> reads an R8 value from a string.
</li>
<li>
<b>S_TO_R8VEC</b> reads an R8VEC from a string.
</li>
<li>
<b>S_WORD_COUNT</b> counts the number of "words" in a string.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
<li>
<b>TIMESTRING</b> writes the current YMDHMS date into a string.
</li>
<li>
<b>XY_DATA_PRINT</b> prints the data of an XY file.
</li>
<li>
<b>XY_DATA_READ</b> reads data from an XY file.
</li>
<li>
<b>XY_DATA_WRITE</b> writes the data of an XY file.
</li>
<li>
<b>XY_EXAMPLE</b> sets up sample XY data suitable for an XY file.
</li>
<li>
<b>XY_HEADER_PRINT</b> prints the header of an XY file.
</li>
<li>
<b>XY_HEADER_READ</b> determines the number of pairs of data in an XY file.
</li>
<li>
<b>XY_HEADER_WRITE</b> writes the header of an XY file.
</li>
<li>
<b>XY_READ_TEST</b> tests the XY file read routines.
</li>
<li>
<b>XY_WRITE</b> writes an XY file.
</li>
<li>
<b>XY_WRITE_TEST</b> tests the XY write routines.
</li>
<li>
<b>XYF_DATA_PRINT</b> prints the data of an XYF file.
</li>
<li>
<b>XYF_DATA_READ</b> reads the data in an XYF file.
</li>
<li>
<b>XYF_DATA_WRITE</b> writes the data of an XYF file.
</li>
<li>
<b>XYF_EXAMPLE</b> sets data suitable for a pair of XY and XYF files.
</li>
<li>
<b>XYF_EXAMPLE_SIZE</b> sizes the data to be created by XYF_EXAMPLE.
</li>
<li>
<b>XYF_HEADER_PRINT</b> prints the header of an XYF file.
</li>
<li>
<b>XYF_HEADER_READ</b> determines the number of face items in an XZF file.
</li>
<li>
<b>XYF_HEADER_WRITE</b> writes the header of an XYF file.
</li>
<li>
<b>XYF_WRITE</b> writes an XYF file.
</li>
<li>
<b>XYL_DATA_PRINT</b> prints the data of an XYL file.
</li>
<li>
<b>XYL_DATA_READ</b> reads the data in an XYL file.
</li>
<li>
<b>XYL_DATA_WRITE</b> writes the data of an XYL file.
</li>
<li>
<b>XYL_EXAMPLE</b> sets data suitable for a pair of XY and XYL files.
</li>
<li>
<b>XYL_EXAMPLE_SIZE</b> sizes the data to be created by XYL_EXAMPLE.
</li>
<li>
<b>XYL_HEADER_PRINT</b> prints the header of an XYL file.
</li>
<li>
<b>XYL_HEADER_READ</b> determines the number of line items in an XYL file.
</li>
<li>
<b>XYL_HEADER_WRITE</b> writes the header of an XYL file.
</li>
<li>
<b>XYL_WRITE</b> writes an XYL file.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../f_src.html">
the FORTRAN90 source codes</a>.
</p>
<hr>
<i>
Last revised on 08 January 2009.
</i>
<!-- John Burkardt -->
</body>
</html>