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<html>
<head>
<title>EAGLE Help: DISPLAY</title>
</head>
<body bgcolor=white>
<font face=Helvetica,Arial>
<hr>
<i>EAGLE Help</i>
<h1><center>DISPLAY</center></h1>
<hr>
<dl>
<dt>
<b>Function</b>
<dd>
Selects the visible layers.
<p>
<dt>
<b>Syntax</b>
<dd>
<tt>DISPLAY</tt><br>
<tt>DISPLAY [option] layer_number..</tt><br>
<tt>DISPLAY [option] layer_name..</tt>
<p>
</dl>
Valid options are: ALL, NONE, ? and ??
<p>
<b>See also</b> <a href=56.htm>LAYER</a>,
<a href=73.htm>PRINT</a>
<p>
The DISPLAY command is used to choose the visible layers. As parameters,
the layer number and the layer name are allowed (even mixed). If the
parameter ALL is chosen, all layers become visible. If the parameter
NONE is used, all layers are switched off. For example:
<pre>
DISPLAY NONE BOTTOM;
</pre>
Following this command only the Bottom layer is displayed.
<p>
Please note that only those signal layers (1 through 16) are available
that have been entered into the layer setup in the <a href=127.htm>Design Rules</a>.
<p>
If the layer name or the layer number includes a negative sign, it
will be filtered out. For example:
<pre>
DISPLAY TOP -BOTTOM -3;
</pre>
In this case the Top layer is displayed while the Bottom layer and
the layer with the number 3 are not shown on the screen.
<p>
Avoid layer names ALL and NONE as well as names starting with a "-".
<p>
If tPlace or bPlace is selected, t/bNames, t/bValues, t/bOrigins and t/bDocu
are automatically selected, too.
<p>
Some commands (PAD, SMD, SIGNAL, ROUTE) automatically activate certain
layers.
<p>
If t/bPlace is selected or deselected in the DISPLAY menu, the layers
t/bNames, t/bValues, and t/bOrigins are selected or deselected, too.
If Symbols is selected/deselected, the layers Names and Values are
selected/deselected, too.
<p>
If the DISPLAY command is invoked without parameters, a dialog is
presented which allows you to adjust all layer settings.
<p>
<b>Undefined Layers</b>
<p>
The options '?' and '??' can be used to control what happens if an undefined
layer is given in a DISPLAY command. Any undefined layers following a '?' will
cause a warning and the user can either accept it or cancel the entire DISPLAY
command. Undefined layers following a '??' will be silently ignored.
This is most useful for writing script files that shall be able to handle any drawing,
even if a particular drawing doesn't contain some of the listed layers.
<pre>
DISPLAY TOP BOTTOM ? MYLAYER1 MYLAYER2 ?? OTHER WHATEVER
</pre>
In the above example the two layers TOP and BOTTOM are required and will cause
an error if either of them is missing. MYLAYER1 and MYLAYER2 will just be reported
if missing, allowing the user to cancel the operation, and OTHER and WHATEVER will
be displayed if they are there, otherwise they will be ignored.
<p>
The '?' and '??' options may appear any number of times and in any sequence.
<p>
<b>Pads and Vias</b>
<p>
If pads or vias have different shapes on different layers, the shapes of the currently
visible (activated with DISPLAY) signal layers are displayed on top of each other.
<p>
If the color selected for layer 17 (Pads) or 18 (Vias) is 0 (which represents
the current background color), the pads and vias are displayed
in the color and fill style of the respective signal layers. If no signal layer is
visible, pads and vias are not displayed.
<p>
If the color selected for layer 17 (Pads) or 18 (Vias) is not the background
color and no signal layers are visible, pads and vias are displayed in the
shape of the uppermost and undermost layer.
<p>
This also applies to printouts made with <a href=73.htm>PRINT</a>.
<p>
<b>Selecting Objects</b>
<p>
If you want to select certain objects or elements (e.g.
with MOVE or DELETE) the corresponding layer must be visible. Elements
can only be selected if the tOrigins (or bOrigins with mirrored elements)
layer is visible!
<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>
</body>
</html>
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