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<!doctype HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<meta http-equiv="Content-Language" content="en-us">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>CD_SVG</title>
<link rel="stylesheet" type="text/css" href="../../style.css">
</head>
<body>
<h2 style="text-align: left">CD_SVG - Scalable Vector Graphics Driver (cdsvg.h)</h2>
<p>This driver allows the generation of a SVG file, a modularized language for
describing two-dimensional vector and mixed vector/raster graphics in XML. The
<a href="http://www.w3.org/TR/SVG/">SVG specification</a> is an open standard
that has been under development by the <a href="http://www.w3.org/">World Wide
Web Consortium</a> (W3C) since 1999.</p>
<h3>Use</h3>
<p>The file is created by calling function <font face="Courier">
<a href="../func/init.html#cdCreateCanvas"><strong>cdCreateCanvas</strong></a>(CD_SVG,
Data)</font>. The <font face="Courier">Data</font> parameter is a string that must contain the filename and the canvas
dimensions, in the following format:</p>
<pre>"<em>filename [widthxheight] [resolution]</em>" or in C<em> "<strong><tt>%s %gx%g %g</tt></strong>"</em></pre>
<p>Only the parameter <font face="Courier">filename</font> is required. The filename must be inside double quotes (")
if it has spaces.<font face="Courier"> Width</font> and <font face="Courier">height</font> are provided in millimeters
(note the lowercase "x" between them), and their default value in pixels is <font face="Courier">INT_MAX</font> for
both dimensions. <font face="Courier">Resolution </font>is the number of pixels per millimeter; its default value is
"3.78 pixels/mm" (96 DPI). <font face="Courier">Width</font>, <font face="Courier">height</font> and
<font face="Courier">resolution</font> are real values.</p>
<p>Any amount of such canvases may exist simultaneously. It is important to note that a call to function
<a href="../func/init.html#cdKillCanvas"><font face="Courier"><strong>
cdKillCanvas</strong></font></a> is required to <b>close</b> the file properly.</p>
<p><strong>IMPORTANT:</strong> because the SVG specification states that
floating point number must use dots "." for floating point separators, we set
the numeric locale to "C" when the canvas is created, and restore it when
it is destroyed. But since it uses the global C function <strong>setlocale</strong>
if you use other C functions that are locale dependent while the SVG canvas is
being used then be aware that they will be affected.</p>
<h3>Behavior of Functions</h3>
<h4>Control</h4>
<dir>
<li><a href="http://www.tecgraf.puc-rio.br/cd/en/func/other.html#cdPlay">
<font face="Courier"><strong>Play</strong></font></a>: does nothing, returns
<font face="Courier">CD_ERROR</font>.</li>
<li><a href="http://www.tecgraf.puc-rio.br/cd/en/func/control.html#cdClear">
<font face="Courier"><strong>Clear</strong></font></a>: does nothing.</li>
</dir>
<h4>Coordinate System and Clipping </h4>
<dir>
<li><a href="../func/coordinates.html#cdUpdateYAxis"><font face="Courier">
<strong>UpdateYAxis</strong></font></a>: the orientation of axis Y is the
opposite to its orientation in the CD library.</li>
<li><b>Complex Regions</b>: not supported.</li>
</dir>
<h4>Attributes</h4>
<dir>
<li><a href="http://www.tecgraf.puc-rio.br/cd/en/func/text.html#cdFontDim">
<font face="Courier"><strong>FontDim</strong></font></a>: is simulated.</li>
<li><a href="http://www.tecgraf.puc-rio.br/cd/en/func/text.html#cdTextSize">
<font face="Courier"><strong>TextSize</strong></font></a>: is simulated.</li>
<li>
<a href="http://www.tecgraf.puc-rio.br/cd/en/func/attributes.html#cdWriteMode">
<font face="Courier"><strong>WriteMode</strong></font></a>: does nothing,
returns <font face="Courier">CD_REPLACE</font>.</li>
</dir>
<h4>Colors</h4>
<dir>
<li><a href="../func/color.html#cdGetColorPlanes"><font face="Courier">
<strong>
GetColorPlanes</strong></font></a>: always returns 24.</li>
<li><a href="http://www.tecgraf.puc-rio.br/cd/en/func/color.html#cdPalette">
<font face="Courier"><strong>Palette</strong></font></a>: does nothing.</li>
</dir>
<h4>Primitives</h4>
<dir>
<li><font face="Courier"><strong>
<a href="http://www.tecgraf.puc-rio.br/cd/en/func/marks.html#cdPixel">Pixel</a></strong></font>:
does not exist in SVG, is simulated using a circle with radius=0.1.</li>
<li>Floating point primitives are supported.</li>
</dir>
<h4>Client Images</h4>
<dir>
<li><a href="../func/client.html#cdGetImageRGB"><font face="Courier"><strong>
GetImageRGB</strong></font></a>: does nothing.</li>
</dir>
<h4>Server Images</h4>
<dir>
<li>All functions do nothing.</li>
</dir>
<h4>Exclusive Attributes</h4>
<ul>
<li>"<b><font face="Courier">CMD</font></b>": saves a string directly to the file. Allows adding
SVG commands
to the file generated by the CD library. (set only)</li>
</ul>
<ul>
<li>"<b><font face="Courier">OPACITY</font></b>": allows the usage of a global
opacity value. The value passed must be a string containing an integer
("%d") [0=full transparent, 255=full opaque]. Use NULL to reset to the
default. Default: 255.</li>
</ul>
<ul>
<li><strong><span style="font-family: Courier">"HATCHBOXSIZE"</span></strong>:
defines the size of smallest hatch box pattern. This affects the spacing
between the hatch lines. The value passed must be a string containing an
integer ("%d"). If the value of the attribute passed is NULL, the value is
rest to the default. When consulted returns the current value ("%d"). Default:
"8".</li>
</ul>
<p> </p>
<p> </p>
</body>
</html>
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