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<title>Pcb</title>
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Node: <a name="Intro">Intro</a>,
Next: <a rel="next" accesskey="n" href="Getting-Started.html#Getting%20Started">Getting Started</a>,
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<h2 class="chapter">Introduction</h2>
<p>Each layout consists of several, mostly independent, objects. This chapter
gives an overview of the object types and their relationship to each other.
For a complete description of how to use <code>Pcb</code>, refer to
<a href="Getting-Started.html#Getting%20Started">Getting Started</a>.
The layout is generated on-screen on a grid that can have its origin
at any desired location.
The X coordinate increases to the right, Y increases down to the bottom.
All distances and sizes in <code>Pcb</code> are measured in mils
(0.001 inch). One unit on the coordinate display is one mil in
distance on the board.
The grid may be set on a metric pitch, but is only correct to within
the nearest +/- 0.01 mil because <code>Pcb</code> stores all dimensions as
integer multiples of 1/100 of a mil or 0.00001 inch.
<p>The sections in this chapter are sorted by the
order of appearance of the objects within a layout file.
<ul class="menu">
<li><a accesskey="1" href="Symbol-Objects.html#Symbol%20Objects">Symbol Objects</a>: Information about fonts and symbols.
<li><a accesskey="2" href="Via-Objects.html#Via%20Objects">Via Objects</a>: Vias and pins connect layers.
<li><a accesskey="3" href="Element-Objects.html#Element%20Objects">Element Objects</a>: Element, the basic type of circuits.
<li><a accesskey="4" href="Layer-Objects.html#Layer%20Objects">Layer Objects</a>: A <code>container</code> for lines, text...
<li><a accesskey="5" href="Line-Objects.html#Line%20Objects">Line Objects</a>: Tracks on the board
<li><a accesskey="6" href="Arc-Objects.html#Arc%20Objects">Arc Objects</a>: Curved tracks
<li><a accesskey="7" href="Polygon-Objects.html#Polygon%20Objects">Polygon Objects</a>: Planes and such
<li><a accesskey="8" href="Text-Objects.html#Text%20Objects">Text Objects</a>: Objects to add symbols to your board.
<li><a accesskey="9" href="Net-Objects.html#Net%20Objects">Net Objects</a>: Describes the desired connections on the board.
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