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<title>Pcb</title>
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<p>
Node: <a name="Layout%20File">Layout File</a>,
Next: <a rel="next" accesskey="n" href="Element-File.html#Element%20File">Element File</a>,
Previous: <a rel="previous" accesskey="p" href="Basic-Types.html#Basic%20Types">Basic Types</a>,
Up: <a rel="up" accesskey="u" href="File-Formats.html#File%20Formats">File Formats</a>
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<h3 class="section">Layout File Format</h3>
<p>The layout file describes a complete layout including symbols, vias,
elements and layers with lines, rectangles and text. This is the most
complex file of all.
<pre class="example"> File = Header Font PCBData
Header = PCBName [GridData] [CursorData] [PCBFlags] [Groups]
PCBName = "PCB(" Name Width Height ")"
GridData = "Grid(" Grid GridOffsetX GridOffsetY ")"
CursorData = "Cursor(" X Y zoom ")"
PCBFlags = "Flags(" Flags ")"
Groups = "Groups(" GroupString ")"
Styles = "Styles(" StyleString ")"
Font = {FontData}...
FontData = {Symbol}...
Symbol = "Symbol(" SymbolID Spacing ")"
"(" {SymbolData}... ")"
SymbolData = {SymbolLine}...
SymbolLine = "SymbolLine(" X1 Y1 X2 Y2 Thickness ")"
PCBData = {Via | Layer | Element}...
Via = "Via(" X Y Thickness DrillingHole Name Flags ")"
Element = "Element(" Flags Description LayoutName Value \
TextX TextY direction scale TextFlags")"
"(" {ElementData}... [Mark] ")"
ElementData = {ElementLine | Pad | Pin | ElementArc }...
ElementArc = "ElementArc(" X Y Width Height
StartAngle DeltaAngle Thickness ")"
ElementLine = "ElementLine(" X1 Y1 X2 Y2 Thickness ")"
Mark = "Mark(" X Y ")"
Pad = "Pad(" X1 Y1 X2 Y2 Thickness Name PinNumber Flags")"
Pin = "Pin(" X Y Thickness DrillingHole Name PinNumber Flags ")"
Layer = "Layer(" LayerNumber Name ")"
"(" {LayerData}... ")"
LayerData = {Line | Polygon | Text}...
Line = "Line(" X1 Y1 X2 Y2 Thickness Flags")"
Arc = "Arc(" X Y Width Height StartAngle DeltaAngle Thickness Flags")"
Polygon = "Polygon(" Flags ")" \
"(" {Points}... ")"
Points = "(" X Y ")"
Text = "Text(" X Y direction scale TextData Flags")"
</pre>
<dl>
<br><dt><code>PCBName</code>
<dd>is used to define the layout's name which is independent of its filename.
It is displayed in the lower left corner of the main window.
<br><dt><code>GridData</code>
<dd>is optional and is used to save the grid setting and offset which were set
at the time the layout was saved.
<br><dt><code>CursorData</code>
<dd>also is an optional parameter to save the last cursor location and zoom value.
The real zoom factor is calculated by scale = 1:(2 power value).
<br><dt><code>PCBFlags</code>
<dd>determine how to draw lines and which name of the elements should be
displayed.
<pre class="example"> bit 4: do rubberband moves and rotates if set
bit 5: display description of elements if set
bit 6: display unique name of an element if set
bit 7: use absolute grid if set
bit 8: don't clip lines to 45 degrees
</pre>
<br><dt><code>Groups</code>
<dd>Layergroups are saved by using this optional parameter. The only way of
changing them is to use an editor and alter the appropriate line. The
characters <em>c,s</em> identify the component- and solder-side for SMD
objects.
<br><dt><code>Symbol</code>
<dd>See the description of font files in this chapter.
<br><dt><code>Via</code>
<dd>Vias are always connected to all layers which also means vias are one
logical level ahead of layers. Vias are defined by position, size, name and
by some flags.
<pre class="example"> bit 0: always clear
bit 1: always set
bit 2: set if via was found during a connection search
bit 4: set if via is a hole (has no copper annulus)
bit 5: display the vias name
bit 6: via has been selected
bit 12: set if via has octagonal shape
Other bits have special meaning and should not be changed
by the user. See const.h for more information
</pre>
<br><dt><code>Element</code>
<dd>See the description of element files in this chapter.
<br><dt><code>Layer</code>
<dd>A layer is the central object from the user's point of view. It holds all
connections and all text objects. Up to 8 may be used individually.
Its number, starting with one, and its name are read as arguments.
<dl>
<br><dt><code>Line</code>
<dd>All lines are identified by their start and endpoints together with their
thickness and some flags. They have to fit a 45 degree scheme.
<pre class="example"> bit 2: set if line was found during a connection search
bit 4: line is a rat-line
bit 6: line has been selected
</pre>
<br><dt><code>Polygon</code>
<dd>used to fill a larger area with <code>copper</code>. The coordinates specify the
corners. The flags are:
<pre class="example"> bit 2: set if polygon was found during a connection search
bit 4: polygon is a 1.5 style polygon that automatically clears pins
bit 6: polygon has been selected
</pre>
<br><dt><code>Text</code>
<dd>You may use text objects to add information to your board. An example would
be naming a connector or marking pin one of it. The position marks the
lower left corner of the string which is also a fix-point for rotations.
Text directions are independent to those of lines. They are counted from
zero to three with a meaning of zero to 270 degree rotations counter-clockwise.
The scaling value is a positive integer which determines a zoom factor in
percent.
<pre class="example"> bit 6: the text has been selected
bit 7: the text is on the solder (back) side of the board
bit 10: the text is on the silkscreen layer
</pre>
</dl>
</dl>
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