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<a name="Export-picture"></a>
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</tr></table>
<a name="Export-picture-1"></a>
<h2 class="section">4.5 Export picture</h2>
<a name="index-SetSize"></a>

<p>Functions in this group save or give access to produced picture. So, usually they should be called after plotting is done.
</p>
<p><a name="setsize"></a>
</p><dl>
<dt><a name="index-setsize"></a><u>MGL command:</u> <b>setsize</b><i> <code>w h</code></i></dt>
<dt><a name="index-SetSize-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetSize</b><i> (<code>int</code> width, <code>int</code> height)</i></dt>
<dt><a name="index-mgl_005fset_005fsize"></a><u>C function:</u> <code>void</code> <b>mgl_set_size</b><i> (<code>HMGL</code> gr, <code>int</code> width, <code>int</code> height)</i></dt>
<dd><p>Sets size of picture in pixels. This function <strong>must be</strong> called before any other plotting because it completely remove picture contents.
</p></dd></dl>

<p><a name="quality"></a>
</p><dl>
<dt><a name="index-quality"></a><u>MGL command:</u> <b>quality</b><i> [<code>val</code>=2]</i></dt>
<dt><a name="index-SetQuality"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetQuality</b><i> (<code>int</code> val=<code>MGL_DRAW_NORM</code>)</i></dt>
<dt><a name="index-mgl_005fset_005fquality"></a><u>C function:</u> <code>void</code> <b>mgl_set_quality</b><i> (<code>HMGL</code> gr, <code>int</code> val)</i></dt>
<dd><p>Sets quality of the plot depending on value <var>val</var>: <code>MGL_DRAW_WIRE=0</code> &ndash; no face drawing (fastest), <code>MGL_DRAW_FAST=1</code> &ndash; no color interpolation (fast), <code>MGL_DRAW_NORM=2</code> &ndash; high quality (normal), <code>MGL_DRAW_HIGH=3</code> &ndash; high quality with 3d primitives (arrows and marks). If <code>MGL_DRAW_LMEM=0x4</code> is set then direct bitmap drawing is used (low memory usage).
</p></dd></dl>

<dl>
<dt><a name="index-GetQuality"></a><u>Method on <code>mglGraph</code>:</u> <code>int</code> <b>GetQuality</b><i> ()</i></dt>
<dt><a name="index-mgl_005fget_005fquality"></a><u>C function:</u> <code>int</code> <b>mgl_get_quality</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Gets quality of the plot: <code>MGL_DRAW_WIRE=0</code> &ndash; no face drawing (fastest), <code>MGL_DRAW_FAST=1</code> &ndash; no color interpolation (fast), <code>MGL_DRAW_NORM=2</code> &ndash; high quality (normal), <code>MGL_DRAW_HIGH=3</code> &ndash; high quality with 3d primitives (arrows and marks). If <code>MGL_DRAW_LMEM=0x4</code> is set then direct bitmap drawing is used (low memory usage).
</p></dd></dl>

<dl>
<dt><a name="index-StartGroup"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>StartGroup</b><i> (const char *name)</i></dt>
<dt><a name="index-mgl_005fstart_005fgroup"></a><u>C function:</u> <code>void</code> <b>mgl_start_group</b><i> (<code>HMGL</code> gr, <code>const char *</code>name)</i></dt>
<dd><p>Starts group definition. Groups contain objects and other groups, they are used to select a part of a model to zoom to or to make invizible or to make semitransparent and so on.
</p></dd></dl>

<dl>
<dt><a name="index-EndGroup"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>EndGroup</b><i> ()</i></dt>
<dt><a name="index-mgl_005fend_005fgroup"></a><u>C function:</u> <code>void</code> <b>mgl_end_group</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Ends group definition.
</p></dd></dl>

<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="#Export-to-file">4.5.1 Export to file</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#Frames_002fAnimation">4.5.2 Frames/Animation</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#Bitmap-in-memory">4.5.3 Bitmap in memory</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#Parallelization">4.5.4 Parallelization</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
</table>

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<td valign="middle" align="left">[<a href="#Frames_002fAnimation" title="Next section in reading order"> &gt; </a>]</td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left">[<a href="mathgl_en_29.html#MathGL-core" title="Beginning of this chapter or previous chapter"> &lt;&lt; </a>]</td>
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<td valign="middle" align="left">[<a href="mathgl_en_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<a name="Export-to-file-1"></a>
<h3 class="subsection">4.5.1 Export to file</h3>
<a name="index-Write"></a>
<a name="index-WriteFrame"></a>
<a name="index-WritePNG"></a>
<a name="index-WriteGIF"></a>
<a name="index-WriteSVG"></a>
<a name="index-WriteBMP"></a>
<a name="index-WriteEPS"></a>
<a name="index-WriteBPS"></a>
<a name="index-WriteTGA"></a>
<a name="index-WriteTEX"></a>
<a name="index-WritePRC"></a>
<a name="index-WriteOBJ"></a>
<a name="index-WriteWGL"></a>
<a name="index-WriteJPEG"></a>
<a name="index-ShowImage"></a>

<p>These functions export current view to a graphic file. The filename <var>fname</var> should have appropriate extension. Parameter <var>descr</var> gives the short description of the picture. Just now the transparency is supported in PNG, SVG, OBJ and PRC files.
</p>
<p><a name="write"></a>
</p><dl>
<dt><a name="index-write"></a><u>MGL command:</u> <b>write</b><i> ['fname'='']</i></dt>
<dt><a name="index-WriteFrame-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>WriteFrame</b><i> (<code>const char *</code>fname=<code>&quot;&quot;</code>, <code>const char *</code>descr=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fwrite_005fframe"></a><u>C function:</u> <code>void</code> <b>mgl_write_frame</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr)</i></dt>
<dd><p>Exports current frame to a file <var>fname</var> which type is determined by the extension. Parameter <var>descr</var> adds description to file (can be <code>&quot;&quot;</code>). If <var>fname</var>=<code>&quot;&quot;</code> then the file &lsquo;<samp>frame####.jpg</samp>&rsquo; is used, where &lsquo;<samp>####</samp>&rsquo; is current frame id and name &lsquo;<samp>frame</samp>&rsquo; is defined by <a href="mathgl_en_31.html#plotid">plotid</a> class property.
</p></dd></dl>


<dl>
<dt><a name="index-WritePNG-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>WritePNG</b><i> (<code>const char *</code>fname, <code>const char *</code>descr=<code>&quot;&quot;</code>, <code>int</code> compr=<code>&quot;&quot;</code>, <code>bool</code> alpha=<code>true</code>)</i></dt>
<dt><a name="index-mgl_005fwrite_005fpng"></a><u>C function:</u> <code>void</code> <b>mgl_write_png</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr)</i></dt>
<dt><a name="index-mgl_005fwrite_005fpng_005fsolid"></a><u>C function:</u> <code>void</code> <b>mgl_write_png_solid</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr)</i></dt>
<dd><p>Exports current frame to PNG file. Parameter <var>fname</var> specifies the file name, <var>descr</var> adds description to file, <var>alpha</var> gives the transparency type. By default there are no description added and semitransparent image used. This function does nothing if HAVE_PNG isn&rsquo;t defined during compilation of MathGL library.
</p></dd></dl>

<dl>
<dt><a name="index-WriteJPEG-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>WriteJPEG</b><i> (<code>const char *</code>fname, <code>const char *</code>descr=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fwrite_005fjpg"></a><u>C function:</u> <code>void</code> <b>mgl_write_jpg</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr)</i></dt>
<dd><p>Exports current frame to JPEG file. Parameter <var>fname</var> specifies the file name, <var>descr</var> adds description to file. By default there is no description added. This function does nothing if HAVE_JPEG isn&rsquo;t defined during compilation of MathGL library.
</p></dd></dl>

<dl>
<dt><a name="index-WriteGIF-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>WriteGIF</b><i> (<code>const char *</code>fname, <code>const char *</code>descr=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fwrite_005fgif"></a><u>C function:</u> <code>void</code> <b>mgl_write_gif</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr)</i></dt>
<dd><p>Exports current frame to GIF file. Parameter <var>fname</var> specifies the file name, <var>descr</var> adds description to file. By default there is no description added. This function does nothing if HAVE_GIF isn&rsquo;t defined during compilation of MathGL library.
</p></dd></dl>

<dl>
<dt><a name="index-WriteBMP-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>WriteBMP</b><i> (<code>const char *</code>fname, <code>const char *</code>descr=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fwrite_005fbmp"></a><u>C function:</u> <code>void</code> <b>mgl_write_bmp</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr)</i></dt>
<dd><p>Exports current frame to BMP file. Parameter <var>fname</var> specifies the file name, <var>descr</var> adds description to file. There is no compression used.
</p></dd></dl>

<dl>
<dt><a name="index-WriteTGA-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>WriteTGA</b><i> (<code>const char *</code>fname, <code>const char *</code>descr=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fwrite_005ftga"></a><u>C function:</u> <code>void</code> <b>mgl_write_tga</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr)</i></dt>
<dd><p>Exports current frame to TGA file. Parameter <var>fname</var> specifies the file name, <var>descr</var> adds description to file. There is no compression used.
</p></dd></dl>

<dl>
<dt><a name="index-WriteEPS-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>WriteEPS</b><i> (<code>const char *</code>fname, <code>const char *</code>descr=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fwrite_005feps"></a><u>C function:</u> <code>void</code> <b>mgl_write_eps</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr)</i></dt>
<dd><p>Exports current frame to EPS file using vector representation. So it is not recommended for the export of large data plot. It is better to use bitmap format (for example PNG or JPEG). However, program has no internal limitations for size of output file. Parameter <var>fname</var> specifies the file name, <var>descr</var> adds description to file. By default there is no description added. If file name is terminated by &lsquo;<samp>z</samp>&rsquo; (for example, &lsquo;<samp>fname.eps.gz</samp>&rsquo;) then file will be compressed in gzip format.
</p></dd></dl>

<dl>
<dt><a name="index-WriteBPS-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>WriteBPS</b><i> (<code>const char *</code>fname, <code>const char *</code>descr=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fwrite_005feps-1"></a><u>C function:</u> <code>void</code> <b>mgl_write_eps</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr)</i></dt>
<dd><p>Exports current frame to EPS file using bitmap representation. Parameter <var>fname</var> specifies the file name, <var>descr</var> adds description to file. By default there is no description added. If file name is terminated by &lsquo;<samp>z</samp>&rsquo; (for example, &lsquo;<samp>fname.eps.gz</samp>&rsquo;) then file will be compressed in gzip format.
</p></dd></dl>

<dl>
<dt><a name="index-WriteSVG-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>WriteSVG</b><i> (<code>const char *</code>fname, <code>const char *</code>descr=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fwrite_005fsvg"></a><u>C function:</u> <code>void</code> <b>mgl_write_svg</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr)</i></dt>
<dd><p>Exports current frame to SVG (Scalable Vector Graphics) file using vector representation. In difference of EPS format, SVG format support transparency that allows to correctly draw semitransparent plot (like <a href="mathgl_en_42.html#surfa">surfa</a>, <a href="mathgl_en_42.html#surf3a">surf3a</a> or <a href="mathgl_en_41.html#cloud">cloud</a>). Note, the output file may be too large for graphic of large data array (especially for surfaces). It is better to use bitmap format (for example PNG or JPEG). However, program has no internal limitations for size of output file. Parameter <var>fname</var> specifies the file name, <var>descr</var> adds description to file (default is file name). If file name is terminated by &lsquo;<samp>z</samp>&rsquo; (for example, &lsquo;<samp>fname.svgz</samp>&rsquo;) then file will be compressed in gzip format.
</p></dd></dl>

<dl>
<dt><a name="index-WriteTEX-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>WriteTEX</b><i> (<code>const char *</code>fname, <code>const char *</code>descr=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fwrite_005ftex"></a><u>C function:</u> <code>void</code> <b>mgl_write_tex</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr)</i></dt>
<dd><p>Exports current frame to LaTeX (package Tikz/PGF) file using vector representation. Note, the output file may be too large for graphic of large data array (especially for surfaces). It is better to use bitmap format (for example PNG or JPEG). However, program has no internal limitations for size of output file. Parameter <var>fname</var> specifies the file name, <var>descr</var> adds description to file (default is file name). Note, there is no text scaling now (for example, in subplots), what may produce miss-aligned labels.
</p></dd></dl>

<dl>
<dt><a name="index-WritePRC-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>WritePRC</b><i> (<code>const char *</code>fname, <code>const char *</code>descr=<code>&quot;&quot;</code>, <code>bool</code> make_pdf=<code>true</code>)</i></dt>
<dt><a name="index-mgl_005fwrite_005fprc"></a><u>C function:</u> <code>void</code> <b>mgl_write_prc</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr, <code>int</code> make_pdf)</i></dt>
<dd><p>Exports current frame to PRC file using vector representation (see <a href="http://en.wikipedia.org/wiki/PRC_%28file_format%29">http://en.wikipedia.org/wiki/PRC_%28file_format%29</a>). Note, the output file may be too large for graphic of large data array (especially for surfaces). It is better to use bitmap format (for example PNG or JPEG). However, program has no internal limitations for size of output file. Parameter <var>fname</var> specifies the file name, <var>descr</var> adds description to file (default is file name). If parameter <var>make_pdf</var>=<code>true</code> and PDF was enabled at MathGL configure then corresponding PDF file with 3D image will be created.
</p></dd></dl>

<dl>
<dt><a name="index-WriteOBJ-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>WriteOBJ</b><i> (<code>const char *</code>fname, <code>const char *</code>descr=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fwrite_005fobj"></a><u>C function:</u> <code>void</code> <b>mgl_write_obj</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr)</i></dt>
<dd><p>Exports current frame to OBJ/MTL file using vector representation (see <a href="http://en.wikipedia.org/wiki/Wavefront_.obj_file">OBJ format</a> for details). Note, the output file may be too large for graphic of large data array (especially for surfaces). It is better to use bitmap format (for example PNG or JPEG). However, program has no internal limitations for size of output file. Parameter <var>fname</var> specifies the file name, <var>descr</var> adds description to file (default is file name).
</p></dd></dl>

<dl>
<dt><a name="index-WriteXYZ"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>WriteXYZ</b><i> (<code>const char *</code>fname, <code>const char *</code>descr=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fwrite_005fxyz"></a><u>C function:</u> <code>void</code> <b>mgl_write_xyz</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr)</i></dt>
<dd><p>Exports current frame to XYZ/XYZL/XYZF files using vector representation (see <a href="http://people.sc.fsu.edu/~jburkardt/data/xyz/xyz.html">XYZ format</a> for details). Note, the output file may be too large for graphic of large data array (especially for surfaces). It is better to use bitmap format (for example PNG or JPEG). However, program has no internal limitations for size of output file. Parameter <var>fname</var> specifies the file name, <var>descr</var> adds description to file (default is file name).
</p></dd></dl>

<dl>
<dt><a name="index-WriteSTL"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>WriteSTL</b><i> (<code>const char *</code>fname, <code>const char *</code>descr=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fwrite_005fstl"></a><u>C function:</u> <code>void</code> <b>mgl_write_stl</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr)</i></dt>
<dd><p>Exports current frame to STL file using vector representation (see <a href="http://en.wikipedia.org/wiki/STL_(file_format)">STL format</a> for details). Note, the output file may be too large for graphic of large data array (especially for surfaces). It is better to use bitmap format (for example PNG or JPEG). However, program has no internal limitations for size of output file. Parameter <var>fname</var> specifies the file name, <var>descr</var> adds description to file (default is file name.
</p></dd></dl>

<dl>
<dt><a name="index-WriteOFF"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>WriteOFF</b><i> (<code>const char *</code>fname, <code>const char *</code>descr=<code>&quot;&quot;</code>, <code>bool</code> colored=<code>false</code>)</i></dt>
<dt><a name="index-mgl_005fwrite_005foff"></a><u>C function:</u> <code>void</code> <b>mgl_write_off</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr, <code>bool</code> colored)</i></dt>
<dd><p>Exports current frame to OFF file using vector representation (see <a href="http://people.sc.fsu.edu/~jburkardt/data/off/off.html">OFF format</a> for details). Note, the output file may be too large for graphic of large data array (especially for surfaces). It is better to use bitmap format (for example PNG or JPEG). However, program has no internal limitations for size of output file. Parameter <var>fname</var> specifies the file name, <var>descr</var> adds description to file (default is file name).
</p></dd></dl>




<dl>
<dt><a name="index-ShowImage-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>ShowImage</b><i> (<code>const char *</code>viewer, <code>bool</code> nowait=<code>false</code>)</i></dt>
<dt><a name="index-mgl_005fshow_005fimage"></a><u>C function:</u> <code>void</code> <b>mgl_show_image</b><i> (<code>const char *</code>viewer, <code>int</code> nowait)</i></dt>
<dd><p>Displays the current picture using external program <var>viewer</var> for viewing. The function save the picture to temporary file and call <var>viewer</var> to display it. If <var>nowait</var>=<code>true</code> then the function return immediately (it will not wait while window will be closed).
</p></dd></dl>


<dl>
<dt><a name="index-WriteJSON"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>WriteJSON</b><i> (<code>const char *</code>fname, <code>const char *</code>descr=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fwrite_005fjson"></a><u>C function:</u> <code>void</code> <b>mgl_write_json</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr)</i></dt>
<dd><p>Exports current frame to textual file using <a href="mathgl_en_85.html#JSON-format">JSON format</a>. Later this file can be used for faster loading and viewing by JavaScript script. Parameter <var>fname</var> specifies the file name, <var>descr</var> adds description to file.
</p></dd></dl>

<dl>
<dt><a name="index-ExportMGLD"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>ExportMGLD</b><i> (<code>const char *</code>fname, <code>const char *</code>descr=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fexport_005fmgld"></a><u>C function:</u> <code>void</code> <b>mgl_export_mgld</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>const char *</code>descr)</i></dt>
<dd><p>Exports points and primitives in file using <a href="mathgl_en_84.html#MGLD-format">MGLD format</a>. Later this file can be used for faster loading and viewing by <code>mglview</code> utility. Parameter <var>fname</var> specifies the file name, <var>descr</var> adds description to file (default is file name).
</p></dd></dl>

<dl>
<dt><a name="index-ImportMGLD"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>ImportMGLD</b><i> (<code>const char *</code>fname, <code>bool</code> add=<code>false</code>)</i></dt>
<dt><a name="index-mgl_005fimport_005fmgld"></a><u>C function:</u> <code>void</code> <b>mgl_import_mgld</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>int</code> add)</i></dt>
<dd><p>Imports points and primitives in file using <a href="mathgl_en_84.html#MGLD-format">MGLD format</a>. Later this file can be used for faster loading and viewing by <code>mglview</code> utility. Parameter <var>fname</var> specifies the file name, <var>add</var> sets to append or replace primitives to existed ones.
</p></dd></dl>



<hr size="6">
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</tr></table>
<a name="Frames_002fAnimation-1"></a>
<h3 class="subsection">4.5.2 Frames/Animation</h3>


<a name="index-NewFrame"></a>
<a name="index-EndFrame"></a>
<a name="index-GetNumFrame"></a>
<a name="index-ResetFrames"></a>
<a name="index-StartGIF"></a>
<a name="index-CloseGIF"></a>

<p>These functions provide ability to create several pictures simultaneously. For most of cases it is useless but for widget classes (see <a href="mathgl_en_47.html#Widget-classes">Widget classes</a>) they can provide a way to show animation. Also you can write several frames into animated GIF file.
</p>
<dl>
<dt><a name="index-NewFrame-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>NewFrame</b><i> ()</i></dt>
<dt><a name="index-mgl_005fnew_005fframe"></a><u>C function:</u> <code>void</code> <b>mgl_new_frame</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Creates new frame. Function returns current frame id. This is not thread safe function in OpenGL mode! Use direct list creation in multi-threading drawing. The function <code>EndFrame()</code> <strong>must</strong> be call after the finishing of the frame drawing for each call of this function.
</p></dd></dl>

<dl>
<dt><a name="index-EndFrame-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>EndFrame</b><i> ()</i></dt>
<dt><a name="index-mgl_005fend_005fframe"></a><u>C function:</u> <code>void</code> <b>mgl_end_frame</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Finishes the frame drawing.
</p></dd></dl>

<dl>
<dt><a name="index-GetNumFrame-1"></a><u>Method on <code>mglGraph</code>:</u> <code>int</code> <b>GetNumFrame</b><i> ()</i></dt>
<dt><a name="index-mgl_005fget_005fnum_005fframe"></a><u>C function:</u> <code>int</code> <b>mgl_get_num_frame</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Gets the number of created frames.
</p></dd></dl>

<dl>
<dt><a name="index-SetFrame"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetFrame</b><i> (<code>int</code> i)</i></dt>
<dt><a name="index-mgl_005fset_005fframe"></a><u>C function:</u> <code>void</code> <b>mgl_set_frame</b><i> (<code>HMGL</code> gr, <code>int</code> i)</i></dt>
<dd><p>Finishes the frame drawing and sets drawing data to frame <var>i</var>, which should be in range [0, <code>GetNumFrame()</code>-1]. This function is similar to <code>EndFrame()</code> but don&rsquo;t add frame to the GIF image.
</p></dd></dl>

<dl>
<dt><a name="index-GetFrame"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>GetFrame</b><i> (<code>int</code> i)</i></dt>
<dt><a name="index-mgl_005fget_005fframe"></a><u>C function:</u> <code>void</code> <b>mgl_get_frame</b><i> (<code>HMGL</code> gr, <code>int</code> i)</i></dt>
<dd><p>Replaces drawing data by one from frame <var>i</var>. Function work if <code>MGL_VECT_FRAME</code> is set on (by default).
</p></dd></dl>

<dl>
<dt><a name="index-ShowFrame"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>ShowFrame</b><i> (<code>int</code> i)</i></dt>
<dt><a name="index-mgl_005fshow_005fframe"></a><u>C function:</u> <code>void</code> <b>mgl_show_frame</b><i> (<code>HMGL</code> gr, <code>int</code> i)</i></dt>
<dd><p>Appends drawing data from frame <var>i</var> to current one. Function work if <code>MGL_VECT_FRAME</code> is set on (by default).
</p></dd></dl>

<dl>
<dt><a name="index-DelFrame"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>DelFrame</b><i> (<code>int</code> i)</i></dt>
<dt><a name="index-mgl_005fdel_005fframe"></a><u>C function:</u> <code>void</code> <b>mgl_del_frame</b><i> (<code>HMGL</code> gr, <code>int</code> i)</i></dt>
<dd><p>Deletes drawing data for frame <var>i</var> and shift all later frame indexes. Function work if <code>MGL_VECT_FRAME</code> is set on (by default). Do nothing in OpenGL mode.
</p></dd></dl>

<dl>
<dt><a name="index-ResetFrames-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>ResetFrames</b><i> ()</i></dt>
<dt><a name="index-mgl_005freset_005fframes"></a><u>C function:</u> <code>void</code> <b>mgl_reset_frames</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Reset frames counter (start it from zero).
</p></dd></dl>

<dl>
<dt><a name="index-StartGIF-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>StartGIF</b><i> (<code>const char *</code>fname, <code>int</code> ms=<code>100</code>)</i></dt>
<dt><a name="index-mgl_005fstart_005fgif"></a><u>C function:</u> <code>void</code> <b>mgl_start_gif</b><i> (<code>HMGL</code> gr, <code>const char *</code>fname, <code>int</code> ms)</i></dt>
<dd><p>Start writing frames into animated GIF file <var>fname</var>. Parameter <var>ms</var> set the delay between frames in milliseconds. You <strong>should not</strong> change the picture size during writing the cinema. Use <code>CloseGIF()</code> to finalize writing. Note, that this function is disabled in OpenGL mode.
</p></dd></dl>

<dl>
<dt><a name="index-CloseGIF-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>CloseGIF</b><i> ()</i></dt>
<dt><a name="index-mgl_005fclose_005fgif"></a><u>C function:</u> <code>void</code> <b>mgl_close_gif</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Finish writing animated GIF and close connected pointers.
</p></dd></dl>

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<a name="Bitmap-in-memory-1"></a>
<h3 class="subsection">4.5.3 Bitmap in memory</h3>

<p>These functions return the created picture (bitmap), its width and height. You may display it by yourself in any graphical library (see also, <a href="mathgl_en_47.html#Widget-classes">Widget classes</a>) or save in file (see also, <a href="#Export-to-file">Export to file</a>).
</p>
<dl>
<dt><a name="index-GetRGB"></a><u>Method on <code>mglGraph</code>:</u> <code>const unsigned char *</code> <b>GetRGB</b><i> ()</i></dt>
<dt><a name="index-GetRGB-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>GetRGB</b><i> (<code>char *</code>buf, <code>int</code> size)</i></dt>
<dt><a name="index-GetBGRN"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>GetBGRN</b><i> (<code>char *</code>buf, <code>int</code> size)</i></dt>
<dt><a name="index-mgl_005fget_005frgb"></a><u>C function:</u> <code>const unsigned char *</code> <b>mgl_get_rgb</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Gets RGB bitmap of the current state of the image. Format of each element of bits is: {red, green, blue}. Number of elements is Width*Height. Position of element {i,j} is [3*i + 3*Width*j] (or is [4*i + 4*Width*j] for <code>GetBGRN()</code>). You have to provide the proper <var>size</var> of the buffer, <var>buf</var>, i.e. the code for Python should look like
</p><pre class="verbatim">from mathgl import *
gr = mglGraph();
bits='\t';
bits=bits.expandtabs(4*gr.GetWidth()*gr.GetHeight());
gr.GetBGRN(bits, len(bits));
</pre></dd></dl>

<dl>
<dt><a name="index-GetRGBA"></a><u>Method on <code>mglGraph</code>:</u> <code>const unsigned char *</code> <b>GetRGBA</b><i> ()</i></dt>
<dt><a name="index-GetRGBA-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>GetRGBA</b><i> (<code>char *</code>buf, <code>int</code> size)</i></dt>
<dt><a name="index-mgl_005fget_005frgba"></a><u>C function:</u> <code>const unsigned char *</code> <b>mgl_get_rgba</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Gets RGBA bitmap of the current state of the image. Format of each element of bits is: {red, green, blue, alpha}. Number of elements is Width*Height. Position of element {i,j} is [4*i + 4*Width*j].
</p></dd></dl>

<dl>
<dt><a name="index-GetWidth"></a><u>Method on <code>mglGraph</code>:</u> <code>int</code> <b>GetWidth</b><i> ()</i></dt>
<dt><a name="index-GetHeight"></a><u>Method on <code>mglGraph</code>:</u> <code>int</code> <b>GetHeight</b><i> ()</i></dt>
<dt><a name="index-mgl_005fget_005fwidth"></a><u>C function:</u> <code>int</code> <b>mgl_get_width</b><i> (<code>HMGL</code> gr)</i></dt>
<dt><a name="index-mgl_005fget_005fheight"></a><u>C function:</u> <code>int</code> <b>mgl_get_height</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Gets width and height of the image.
</p></dd></dl>


<dl>
<dt><a name="index-CalcXYZ"></a><u>Method on <code>mglGraph</code>:</u> <code>mglPoint</code> <b>CalcXYZ</b><i> (<code>int</code> xs, <code>int</code> ys)</i></dt>
<dt><a name="index-mgl_005fcalc_005fxyz"></a><u>C function:</u> <code>void</code> <b>mgl_calc_xyz</b><i> (<code>HMGL</code> gr, <code>int</code> xs, <code>int</code> ys, <code>mreal *</code>x, <code>mreal *</code>y, <code>mreal *</code>z)</i></dt>
<dd><p>Calculate 3D coordinate {x,y,z} for screen point {xs,ys}. At this moment it ignore perspective and transformation formulas (curvilinear coordinates). The calculation are done for the last used InPlot (see <a href="mathgl_en_33.html#Subplots-and-rotation">Subplots and rotation</a>).
</p></dd></dl>

<dl>
<dt><a name="index-CalcScr"></a><u>Method on <code>mglGraph</code>:</u> <code>mglPoint</code> <b>CalcScr</b><i> (<code>mglPoint</code> p)</i></dt>
<dt><a name="index-mgl_005fcalc_005fscr"></a><u>C function:</u> <code>void</code> <b>mgl_calc_scr</b><i> (<code>HMGL</code> gr, <code>mreal</code> x, <code>mreal</code> y, <code>mreal</code> z, <code>int *</code>xs, <code>int *</code>ys)</i></dt>
<dd><p>Calculate screen point {xs,ys} for 3D coordinate {x,y,z}. The calculation are done for the last used InPlot (see <a href="mathgl_en_33.html#Subplots-and-rotation">Subplots and rotation</a>).
</p></dd></dl>

<dl>
<dt><a name="index-SetObjId"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetObjId</b><i> (<code>int</code> id)</i></dt>
<dt><a name="index-mgl_005fset_005fobj_005fid"></a><u>C function:</u> <code>void</code> <b>mgl_set_obj_id</b><i> (<code>HMGL</code> gr, <code>int</code> id)</i></dt>
<dd><p>Set the numeric id for object or subplot/inplot.
</p></dd></dl>

<dl>
<dt><a name="index-GetObjId"></a><u>Method on <code>mglGraph</code>:</u> <code>int</code> <b>GetObjId</b><i> (<code>int</code> xs, <code>int</code> ys)</i></dt>
<dt><a name="index-mgl_005fget_005fobj_005fid"></a><u>C function:</u> <code>int</code> <b>mgl_get_obj_id</b><i> (<code>HMGL</code> gr, <code>int</code> xs, <code>int</code> ys)</i></dt>
<dd><p>Get the numeric id for most upper object at pixel {xs, ys} of the picture.
</p></dd></dl>

<dl>
<dt><a name="index-GetSplId"></a><u>Method on <code>mglGraph</code>:</u> <code>int</code> <b>GetSplId</b><i> (<code>int</code> xs, <code>int</code> ys)</i></dt>
<dt><a name="index-mgl_005fget_005fspl_005fid"></a><u>C function:</u> <code>int</code> <b>mgl_get_spl_id</b><i> (<code>HMGL</code> gr, <code>int</code> xs, <code>int</code> ys)</i></dt>
<dd><p>Get the numeric id for most subplot/inplot at pixel {xs, ys} of the picture.
</p></dd></dl>

<dl>
<dt><a name="index-Highlight"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>Highlight</b><i> (<code>int</code> id)</i></dt>
<dt><a name="index-mgl_005fhighlight"></a><u>C function:</u> <code>void</code> <b>mgl_highlight</b><i> (<code>HMGL</code> gr, <code>int</code> id)</i></dt>
<dd><p>Highlight the object with given <var>id</var>.
</p></dd></dl>

<dl>
<dt><a name="index-IsActive"></a><u>Method on <code>mglGraph</code>:</u> <code>long</code> <b>IsActive</b><i> (<code>int</code> xs, <code>int</code> ys, <code>int</code> d=<code>1</code>)</i></dt>
<dt><a name="index-mgl_005fis_005factive"></a><u>C function:</u> <code>long</code> <b>mgl_is_active</b><i> (<code>HMGL</code> gr, <code>int</code> xs, <code>int</code> ys, <code>int</code> d)</i></dt>
<dd><p>Checks if point {<var>xs</var>, <var>ys</var>} is close to one of active point (i.e. mglBase::Act) with accuracy <var>d</var> and return its index or <code>-1</code> if not found. Active points are special points which characterize primitives (like edges and so on). This function for advanced users only.
</p></dd></dl>


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</tr></table>
<a name="Parallelization-1"></a>
<h3 class="subsection">4.5.4 Parallelization</h3>

<a name="index-Combine"></a>
<a name="index-MPI_005fSend"></a>
<a name="index-MPI_005fRecv"></a>

<p>Many of things MathGL do in parallel by default (if MathGL was built with pthread). However, there is function which set the number of threads to be used.
</p>
<dl>
<dt><a name="index-mgl_005fset_005fnum_005fthr"></a><u>C function:</u> <code>int</code> <b>mgl_set_num_thr</b><i> (<code>int</code> n)</i></dt>
<dd><p>Set the number of threads to be used by MathGL. If <var>n</var>&lt;1 then the number of threads is set as maximal number of processors (cores). If <var>n</var>=1 then single thread will be used (this is default if pthread was disabled).
</p></dd></dl>

<p>Another option is combining bitmap image (taking into account Z-ordering) from different instances of  <code>mglGraph</code>. This method is most appropriate for computer clusters when the data size is so large that it exceed the memory of single computer node.
</p>
<dl>
<dt><a name="index-Combine-1"></a><u>Method on <code>mglGraph</code>:</u> <code>int</code> <b>Combine</b><i> (<code>const mglGraph *</code>g)</i></dt>
<dt><a name="index-mgl_005fcombine_005fgr"></a><u>C function:</u> <code>int</code> <b>mgl_combine_gr</b><i> (<code>HMGL</code> gr, <code>HMGL</code> g)</i></dt>
<dd><p>Combine drawing from instance <var>g</var> with <var>gr</var> (or with this) taking into account Z-ordering of pixels. The width and height of both instances must be the same.
</p></dd></dl>

<dl>
<dt><a name="index-MPI_005fSend-1"></a><u>Method on <code>mglGraph</code>:</u> <code>int</code> <b>MPI_Send</b><i> (<code>int</code> id)</i></dt>
<dt><a name="index-mgl_005fmpi_005fsend"></a><u>C function:</u> <code>int</code> <b>mgl_mpi_send</b><i> (<code>HMGL</code> gr, <code>int</code> id)</i></dt>
<dd><p>Send graphical information from node <var>id</var> using MPI. The width and height in both nodes must be the same.
</p></dd></dl>

<dl>
<dt><a name="index-MPI_005fRecv-1"></a><u>Method on <code>mglGraph</code>:</u> <code>int</code> <b>MPI_Recv</b><i> (<code>int</code> id)</i></dt>
<dt><a name="index-mgl_005fmpi_005fsend-1"></a><u>C function:</u> <code>int</code> <b>mgl_mpi_send</b><i> (<code>HMGL</code> gr, <code>int</code> id)</i></dt>
<dd><p>Receive graphical information from node <var>id</var> using MPI. The width and height in both nodes must be the same.
</p></dd></dl>



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