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<html>
<head>
<title>EAGLE Help: WIRE</title>
</head>
<body bgcolor=white>
<font face=Helvetica,Arial>
<hr>
<i>EAGLE Help</i>
<h1><center>WIRE</center></h1>
<hr>
<dl>
<dt>
<b>Function</b>
<dd>
Adds wires (tracks) to a drawing.
<p>
<dt>
<b>Syntax</b>
<dd>
<tt>WIRE ['signal_name'] [width] * *..</tt><br>
<tt>WIRE ['signal_name'] [width] [ROUND | FLAT] * [curve | @radius] *..</tt>
<p>
<dt>
<b>Mouse</b>
<dd>
Center button selects the layer.<br>
Right button changes the wire bend (see <a href=86.htm>SET Wire_Bend</a>).
<p>
<dt>
<b>Keyboard</b>
<dd>
<tt>Shift</tt> reverses the direction of switching bend styles.<br>
<tt>Ctrl</tt> toggles between corresponding bend styles.<br>
<tt>Ctrl</tt> when placing the end point defines arc radius.
<p>
</dl>
<b>See also</b> <a href=60.htm>MITER</a>,
<a href=88.htm>SIGNAL</a>,
<a href=83.htm>ROUTE</a>,
<a href=32.htm>CHANGE</a>,
<a href=63.htm>NET</a>,
<a href=31.htm>BUS</a>,
<a href=39.htm>DELETE</a>,
<a href=81.htm>RIPUP</a>,
<a href=27.htm>ARC</a>
<p>
The WIRE command is used to add wires (tracks) to a drawing. The wire
begins at the first point specified and runs to the second. Additional
points draw additional wire segments. Two mouse clicks at the same
position finish the wire and a new one can be started at the position
of the next mouse click.
<p>
Depending on the currently active wire bend, one or two wire segments will
be drawn between every two points. The wire bend defines the angle
between the segments and can be changed with the right mouse button (holding
the Shift key down while clicking the right mouse button reverses the direction
in which the bend styles are gone through, and the Ctrl key makes it toggle
between corresponding bend styles).
<p>
Pressing the center mouse button brings a popup menu from which you
may select the layer into which the wire will be drawn.
<p>
The special keywords <tt>ROUND</tt> and <tt>FLAT</tt>, as well as the <i>curve</i>
parameter, can be used to draw an arc (see below).
<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, all subsequent wires 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 a wire 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 WIRE command
with the</b> <tt>signal_name</tt> <b>parameter!</b>
<p>
<b>Wire Width</b>
<p>
Entering a number after activating the WIRE command changes the width
of the wire (in the present unit) which can be up to 0.51602 inch
(13.1 mm).
<p>
The wire width can be changed with the command
<pre>
CHANGE WIDTH width *
</pre>
at any time.
<p>
<b>Wire Style</b>
<p>
Wires can have one of the following <i>styles</i>:
<ul>
<li>Continuous
<li>LongDash
<li>ShortDash
<li>DashDot
</ul>
The wire style can be changed with the <a href=32.htm>CHANGE</a> command.
<p>
Note that the DRC and Autorouter will always treat wires as "Continuous",
even if their style is different. Wire styles are mainly for electrical
and mechanical drawings and should not be used on signal layers. It is
an explicit DRC error to use a non-continuous wire as part of a signal
that is connected to any pad.
<p>
<b>Signals in Top, Bottom, and Route Layers</b>
<p>
Wires (tracks) in the layers Top, Bottom, and ROUTE2...15
are treated as signals. If you draw a wire in either of these layers
starting from an existing signal, then all of the segments of this wire
belong to that signal (only if the center of the wire is placed exactly onto
the center of the existing wire or pad). If you finish this drawing operation with a
wire segment connected to a different signal, then EAGLE will ask
you if you want to connect the two signals.
<p>
Note that EAGLE treats each wire segment as a single object
(e.g. when deleting a wire).
<p>
When the WIRE command is active the center mouse button
can be used to change the layer on which the wire is drawn.
<p>
Do not use the WIRE command for nets, buses, and airwires.
See <a href=63.htm>NET</a>,
<a href=31.htm>BUS</a> and
<a href=88.htm>SIGNAL</a>.
<p>
<b>Drawing Arcs</b>
<p>
Wires and arcs are basically the same objects, so you can draw an arc either by
using the <a href=27.htm>ARC</a> command, or by adding the necessary parameters
to the WIRE command. To make a wire an arc it needs either the <i>curve</i> parameter, which
defines the "curvature" of the arc, or the <i>@radius</i> parameter, which defines
the radius of the arc (note the <tt>'@'</tt>, which is necessary to be able to tell
apart <i>curve</i> and <i>radius</i>).
<p>
The valid range for <i>curve</i> is <tt>-360</tt>..<tt>+360</tt>, and its value means what
part of a full circle the arc consists of. A value of <tt>90</tt>, for instance,
would result in a <tt>90°</tt> arc, while <tt>180</tt> would give you a semicircle.
The maximum value of <tt>360</tt> can only be reached theoretically, since this would
mean that the arc consists of a full circle, which, because the start and end points
have to lie on the circle, would have to have an infinitely large diameter. Positive
values for <i>curve</i> mean that the arc is drawn in a mathematically positive sense
(i.e. counterclockwise). If <i>curve</i> is <tt>0</tt>, the arc is a straight line
("no curvature"), which is actually a wire. Note that in order to distinguish the
<i>curve</i> parameter from the <i>width</i> parameter, it always has to be given with
a sign (<tt>'+'</tt> or <tt>'-'</tt>), even if it is a positive value.<br>
<p>
As an example, the command
<pre>
WIRE (0 0) +180 (0 10);
</pre>
would draw a semicircle from the point (0 0) to (0 10), in counterclockwise
direction.
<p>
If a <i>radius</i> is given, the arc will have that radius. Just like the <i>curve</i>
parameter, <i>radius</i> also must have a sign in order to determine the arcs
orientation.
For example, the command
<pre>
WIRE (0 0) @+100 (0 200);
</pre>
would draw a semicircle from the point (0 0) to (0 200) (with a radius of 100),
in counterclockwise direction. Note that if the end point is more than twice the
radius away from the start point, a straight line will be drawn.
<p>
The arc radius can also be defined by placing the wire end point with the <tt>Ctrl</tt>
key pressed (typically at the center of the circle on which the arc shall lie).
In that case the point is not taken as an actual end point, but is rather
used to set the radius of an arc. You can then move the cursor around and place an
arc with the given radius (the right mouse button together with <tt>Ctrl</tt> will
toggle the arc's orientation). If you move the cursor more than twice the radius
away from the start point, a straight line will be drawn.
<p>
In order to be able to draw any arc with the WIRE command (which is especially important
for generated script files), the keywords <tt>ROUND</tt> and <tt>FLAT</tt> are also
allowed in the WIRE command. Note, though, that these apply only to actual arcs
(straight wires always have round endings). By default, arcs created with the WIRE
command have round endings.
<p>
For performance reasons "round" endings are approximated by "half octagons" on
some output devices.
<hr>
<table width=100% cellspacing=0 border=0><tr><td align=left><font face=Helvetica,Arial>
<a href=index.htm>Index</a>
</font></td><td align=right><font face=Helvetica,Arial size=-1>
<i>Copyright © 2005 CadSoft Computer GmbH</i>
</font></td></tr></table>
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</font>
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