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<title>Ipe Manual -- 4.6 Symbolic and absolute attributes</title>
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<table width="100%" cellpadding=0 cellspacing=2><tr><td bgcolor="#99ccff"><a href="manual_11.html"><img border="0" alt="4.7 Zoom and pan" src="next.png"></a></td><td bgcolor="#99ccff"><a href="manual_4.html"><img border="0" alt="4 General Concepts" src="up.png"></a></td><td bgcolor="#99ccff"><a href="manual_9.html"><img border="0" alt="4.5 Line width, line dash pattern, and arrows" src="previous.png"></a></td><td align="center" bgcolor="#99ccff" width="100%"><b>4.6 Symbolic and absolute attributes</b></td></tr></table>
<h2>4.6 Symbolic and absolute attributes</h2>
<p>Attributes such as color, line width, dash style, mark size, or text
size, can be either absolute (a number, or a set of numbers specifying
a color) or symbolic (a name). Symbolic attributes must be translated
to absolute values by a <a href="manual_28.html"><em>style sheet</em></a>
for rendering.
<p>One purpose of style sheets is to be able to reuse figures from
articles in presentations. Obviously, the figure has to use much
larger fonts, markers, arrows, and fatter lines in the presentation.
If the original figure used symbolic attributes, this can be achieved
by simply swapping the style sheet for another one.
<p>The Ipe user interface can be switched between displaying absolute and
symbolic attributes (using <em>Absolute attributes</em> in the
<em>View</em> menu). When creating an object, it takes its attributes
from the current user interface settings, so if you are in symbolic
mode, the object gets symbolic attributes, otherwise it gets absolute
attributes. Absolute attributes have the advantage that you are free
to choose any value you wish, including picking arbitrary colors using
a color chooser. In symbolic mode, you can only use the choices
provided by the current <a href="manual_28.html"><em>style sheet</em></a>.
<p>The choices for symbolic attributes provided in the Ipe user interface
are taken from your style sheet. The standard style sheet is
deliberately short, to encourage users to figure out how to make their
own.
<p>The settings for grid size and axis angle can be switched between
symbolic and absolute independently. The current setting has no
influence on objects being created.
<hr />
<table width="100%" cellpadding=0 cellspacing=2><tr><td bgcolor="#99ccff"><a href="manual_11.html"><img border="0" alt="4.7 Zoom and pan" src="next.png"></a></td><td bgcolor="#99ccff"><a href="manual_4.html"><img border="0" alt="4 General Concepts" src="up.png"></a></td><td bgcolor="#99ccff"><a href="manual_9.html"><img border="0" alt="4.5 Line width, line dash pattern, and arrows" src="previous.png"></a></td><td align="center" bgcolor="#99ccff" width="100%"><b>4.6 Symbolic and absolute attributes</b></td></tr></table></body></html>
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