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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_PS</title>
<link rel="stylesheet" type="text/css" href="../../style.css">
</head>
<body>
<h2>CD_PS - PostScript Driver (cdps.h)</h2>
<p>This drivers allows generating a PostScript file. This format was created to be a high-quality graphics language
for printers and is currently supported by several printers. If your printer supports PostScript, you can send the
file generated by the driver directly to the printer port. Usually, the filename has an extension .PS or .EPS. The
driver generates level-2 PostScript, therefore some PostScript viewers might present errors. The format's copyrights
are property of <a href="http://www.adobe.com" target="_top">Adobe Systems</a>. </p>
<h3>Use</h3>
<p>The file is created and opened by calling function <font face="Courier">
<a href="../func/init.html#cdCreateCanvas"><strong>cdCreateCanvas</strong></a>(CD_PS,
Data)</font>, in which <font face="Courier">Data</font> contains the filename and canvas dimensions. This function
opens the file and writes its header. Then, other functions in the CD library can be called as usual. The
<font face="Courier">Data</font> parameter string has the following format:</p>
<pre>"<em>filename -p[paper] -w[width] -h[height] -l[left] -r[right] -b[bottom] -t[top] -s[resolution] [-e]</em> <em>[-g] [-o] [-1] d[margin]</em>"<em><br>
</em>or in C<em><br>
"<strong><tt>%s -p%d -w%g -h%g -l%g -r%g -b%g -t%g -s%d -e -o -1 -g -d%g</tt></strong>"</em></pre>
<p>The filename must be inside double quotes (") if it has spaces. 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><b>Paper Size - </b>The default paper size is A4. It is possible to change it by using one of the predefined sizes
- <strong><tt>CD_A0</tt></strong>, <strong><tt>CD_A1</tt></strong>, <strong><tt>CD_A2</tt></strong>, <strong><tt>CD_A3</tt></strong>,
<strong><tt>CD_A4</tt></strong>, <strong><tt>CD_A5</tt></strong>, <strong><tt>CD_LETTER</tt></strong> and <strong><tt>
CD_LEGAL</tt></strong> - with parameter "<font face="Courier">-p</font>". It is also possible to define a paper in a
particular size by using parameters "<font face="Courier">-w</font>" e "<font face="Courier">-h</font>". Values are
provided in millimeters.</p>
<div align="center">
<center>
<table border="1" cellpadding="3">
<caption valign="top"><font size="4">Default Paper Sizes</font></caption>
<tr>
<td> </td>
<th>Width (mm)</th>
<th>Length (mm)</th>
</tr>
<tr>
<td><strong>A0</strong></td>
<td align="center">841</td>
<td align="center">1187</td>
</tr>
<tr>
<td><strong>A1</strong></td>
<td align="center">594</td>
<td align="center">841</td>
</tr>
<tr>
<td><strong>A2</strong></td>
<td align="center">420</td>
<td align="center">594</td>
</tr>
<tr>
<td><strong>A3</strong></td>
<td align="center">297</td>
<td align="center">420</td>
</tr>
<tr>
<td><strong>A4</strong></td>
<td align="center">210</td>
<td align="center">297</td>
</tr>
<tr>
<td><strong>A5</strong></td>
<td align="center">148</td>
<td align="center">210</td>
</tr>
<tr>
<td><strong>Letter</strong></td>
<td align="center">216</td>
<td align="center">279</td>
</tr>
<tr>
<td><strong>Legal</strong></td>
<td align="center">216</td>
<td align="center">356</td>
</tr>
</table>
</center>
</div>
<p><b>Margins -</b> The margins are controlled by parameters "<font face="Courier">-l</font>" "<font face="Courier">-r</font>"
"<font face="Courier">-t</font>" and "<font face="Courier">-b</font>" (<em>left, right, top, bottom</em>). Values are
provided in millimeters. Default margins are 25.4 mm to all parameters. You can draw only inside the margins.</p>
<p><b>Resolution -</b> Resolution is used to convert values from millimeters to pixels (the same as points, but the
number of points is per inch - DPI). Use parameter "<font face="Courier">-s</font>" to configure the resolution. The
default value is 300 DPI.</p>
<p><b>Orientation -</b> The page can be oriented as portrait or landscape. The default value is portrait, but when the
parameter "-o" is used, the horizontal and vertical values are switched.</p>
<p><b>EPS -</b> The PostScript file can be in an <strong>Encapsulated PostScript<b> </b></strong>format. For such,
simply specify the parameter "<font face="Courier">-e</font>". It is useful for other applications to import the
PostScript file. You can define the margins of the bounding box by means of parameter "<font face="Courier">-d</font>",
in millimeters.</p>
<p><b>Debug -</b> Parameter "<font face="Courier">-g</font>" adds a series of comments to the PS file, making the
beginning and end of a command from the CD library explicit. It is useful only for those who understand PostScript and
wish to identify a problem. It considerably increases the file size.</p>
<p><b>Level 1 -</b> Parameter "<font face="Courier">-1</font>" forces the driver to generate a level-1 PostScript. In
this case, pattern, stipple and hatch are not supported.</p>
<p><b>Pages -</b> Use function <font face="Courier">cdFlush</font> to change to a new page. The previous page will not
be changed.</p>
<h3>Behavior of Functions</h3>
<h4>Control</h4>
<ul>
<li><a href="../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="../func/control.html#cdFlush"><font face="Courier"><strong>Flush</strong></font></a>:
changes to a new page, preserving the previous one. Does nothing in EPS mode.</li>
<li><a href="../func/control.html#cdClear"><font face="Courier"><strong>Clear</strong></font></a>:
does nothing.</li>
</ul>
<h4>Coordinate System & Clipping</h4>
<ul>
<li><a href="../func/coordinates.html#cdGetCanvasSize"><font face="Courier">
<strong>GetCanvasSize</strong></font></a>: returns the page's size within the margins (drawing area).</li>
<li><a href="../func/coordinates.html#cdUpdateYAxis"><font face="Courier">
<strong>UpdateYAxis</strong></font></a>: does nothing.</li>
<li><b>Complex Regions</b>: not supported.</li>
</ul>
<h4>Attributes</h4>
<ul>
<li><a href="../func/attributes.html#cdBackground"><font face="Courier">
<strong>
Background</strong></font></a> does nothing, returns <font face="Courier">CD_WHITE</font>.</li>
<li><a href="../func/filled.html#cdBackOpacity"><font face="Courier"><strong>
BackOpacity</strong></font></a>: does nothing, returns <font face="Courier">CD_TRANSPARENT</font>.</li>
<li><a href="../func/attributes.html#cdWriteMode"><font face="Courier">
<strong>
WriteMode</strong></font></a>: does nothing, returns <font face="Courier">CD_REPLACE</font>.</li>
<li><a href="../func/text.html#cdFontDim"><font face="Courier"><strong>FontDim</strong></font></a>:
is simulated.</li>
<li><a href="../func/text.html#cdTextSize"><font face="Courier"><strong>
TextSize</strong></font></a>: is simulated.</li>
<li><a href="../func/filled.html#cdHatch"><font face="Courier"><strong>Hatch</strong></font></a>:
is always opaque (to be implemented).</li>
<li><a href="../func/filled.html#cdStipple"><font face="Courier"><strong>
Stipple</strong></font></a>: is always opaque (to be implemented).</li>
<li><a href="../func/text.html#cdTextAlignment"><font face="Courier"><strong>
TextAlignment</strong></font></a>: <font face="Courier">Baseline</font> is the same as <font face="Courier">South</font>.</li>
<li><a href="../func/text.html#cdFont"><font face="Courier"><strong>Font</strong></font></a>:
old name "System" is mapped to "Courier". Styles are added to the Postscript
font name.</li>
</ul>
<h4>Colors </h4>
<ul>
<li><a href="../func/color.html#cdGetColorPlanes"><font face="Courier">
<strong>
GetColorPlanes</strong></font></a>: returns 24.</li>
<li><a href="../func/color.html#cdPalette"><font face="Courier"><strong>Palette</strong></font></a>:
does nothing. </li>
</ul>
<h4>Client Images</h4>
<ul>
<li><a href="../func/client.html#cdGetImageRGB"><font face="Courier"><strong>
GetImageRGB</strong></font></a>: does nothing.</li>
<li><font face="Courier"><strong><a href="../func/client.html#cdPutImageMap">
PutImageMap</a></strong></font>: stores an RGB image in the file (to be implemented).</li>
<li><a href="../func/client.html#cdPutImageRGBA"><font face="Courier"><strong>
PutImageRGBA</strong></font></a>: alpha is ignored (to be implemented).</li>
</ul>
<h4>Primitives</h4>
<ul>
<li><font face="Courier"><strong><a href="../func/marks.html#cdPixel">Pixel</a></strong></font>:
does not exist in PS, is simulated using a circle with radius=1.</li>
<li>Floating point primitives are supported.</li>
<li>Filled primitves do not include the line at the edges of the filled area.</li>
</ul>
<h4>Server Images</h4>
<ul>
<li>All functions do nothing.</li>
</ul>
<h4>Exclusive Attributes</h4>
<ul>
<li>"<strong><font face="Courier">POLYHOLE</font></strong>": defines the index of
the vertex where there is a hole in a
closed polygon. It will affect the next <strong>cdEnd</strong>. Can be called several times between
<strong>cdBegin</strong> and <strong>cdEnd</strong> to define holes. The value passed must
be a string containing an integer ("%d"). If the value of the attribute passed is NULL, all holes will no longer be
considered. When consulted returns the current number of holes ("%d"). It can have a maximum of 500 holes.</li>
</ul>
<ul>
<li>"<b><font face="Courier">CMD</font></b>": saves a string directly to the file. Allows adding PostScript commands
to the file generated by the CD library. (set only)</li>
</ul>
<ul>
<li>"<b><font face="Courier">ROTATE</font></b>": allows the usage of 1 angle and 1 coordinate (x, y), that
define a global rotation transformation centered in the specified coordinate. Use 1 real and 2 integer values inside a
string ("%g %d %d" = angle x y).</li>
</ul>
</body>
</html>
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