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<html>
<head>
<title>EAGLE Help: ARC</title>
</head>
<body bgcolor=white>
<font face=Helvetica,Arial>
<hr>
<i>EAGLE Help</i>
<h1><center>ARC</center></h1>
<hr>
<dl>
<dt>
<b>Function</b>
<dd>
Draw an arc of variable diameter, width, and length.
<p>
<dt>
<b>Syntax</b>
<dd>
<tt>ARC ['signal_name'] [CW | CCW] [ROUND | FLAT] [width] * * *</tt>
<p>
<dt>
<b>Mouse</b>
<dd>
Center button changes the active layer.<br>
Right button changes the orientation.
<p>
</dl>
<b>See also</b> <a href=32.htm>CHANGE</a>,
<a href=100.htm>WIRE</a>,
<a href=33.htm>CIRCLE</a>
<p>
The ARC command, followed by three mouse clicks on a drawing, draws
an arc of defined width. The first point defines a point on a circle,
the second its diameter. Entering the second coordinate reduces the
circle to a semi-circle, while the right button alters the direction
from first to second point. Entry of a third coordinate truncates
the semi-circle to an arc extending to a point defined by the intersection
of the circumference and a line between the third point and the arc
center.
<p>
The parameters CW and CCW enable you to define the direction of the
arc (clockwise or counterclockwise). ROUND and FLAT define whether the arc
endings are round or flat, respectively (please note that for performance reasons
"round" endings are approximated by "half octagons" on some output
devices, as is also the case with Wires).
<p>
<b>Signal name</b>
<p>
The <tt>signal_name</tt> parameter is intended mainly to be used in
script files that read in generated data. If a <tt>signal_name</tt>
is given, the arc will be added to that signal and no
automatic checks will be performed.<br>
<b>This feature should be used with great care because it could result
in short circuits if an arc is placed in a way that it would connect
different signals. Please run a
<a href=42.htm>Design Rule Check</a> after using the ARC command
with the</b> <tt>signal_name</tt> <b>parameter!</b>
<p>
<b>Line Width</b>
<p>
The parameter "width" defines the thickness of the drawn line.
It can be changed or predefined with the command:
<pre>
CHANGE WIDTH width;
</pre>
The adjusted width is identical to the line width for wires.
<p>
Arcs with angles of 0 or 360 degrees or a radius of 0 are
not accepted.
<p>
Example for text input:
<pre>
GRID inch 1;
ARC CW (0 1) (0 -1) (1 0);
</pre>
generates a 90-degree arc with the center at the origin.
<hr>
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