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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<h1>Layer Properties (.lyp) File Format</h1>

<p>
This is a brief description of the layer properties file format (.lyp).
The file is basically an XML file with a certain structure. It is not just a plain layer list but also includes 
custom stipple pattern, multiple tabs and a hierarchy a layer groups.
</p>

<p>
There are basically two versions: multi-tab files and single-tab files.
The multi-tab structure is used when a .lyp file contains multiple properties lists shown
as tabs in the layer list.
</p>

<h2>Single-Tab Files</h2>

<p>
The simple form of a layer properties file is a simple list of property definitions. Each property definition
corresponds to one entry in the layer list:
</p>

<pre>
&lt;layer-properties&gt;
 &lt;properties&gt;
  (property definitions)
 &lt;/properties&gt;
 &lt;properties&gt;
  (property definitions)
 &lt;/properties&gt;
 ...
&lt;/layer-properties&gt;
</pre>

<p>
Each entry may contain child entries forming a hierarchy of layer properties nodes 
(the "groups" in the layer list) by adding &lt;group-member&gt; elements. Groups can be 
nested by including more &lt;group-member&gt; elements inside such a declaration:
</p>

<pre>
&lt;layer-properties&gt;
 ... 
 &lt;properties&gt;
  (property definitions)
  &lt;group-members&gt;
   (property definitions)
   &lt;group-members&gt;
    ...
   &lt;/group-members&gt;
  &lt;/group-members&gt;
 &lt;/properties&gt;
 ...
&lt;/layer-properties&gt;
</pre>

<p>
A layer properties list can hold custom fill pattern which are referred to by the 
"dither-pattern" element of the property definitions using "Cx" values:
</p>

<pre>
&lt;layer-properties&gt;
 ...
  &lt;custom-dither-pattern&gt;
   &lt;pattern&gt;
    (pattern lines)
   &lt;/pattern&gt;
   &lt;order&gt;(order index)&lt;/order&gt;
   &lt;name&gt;(name)&lt;/name&gt;
  &lt;/custom-dither-pattern&gt;
&lt;/layer-properties&gt;
</pre>

<p>
The order index is a number specifying the order which the pattern are presented in 
the pattern list. Independently of that, the first pattern is referred to as "C0", the
second as "C1" and so on.
"name" gives the name under which the pattern appears in the list.
</p>

<p>
The pattern lines are given a strings in "line" elements where a "." is for a non-set pixel while
a "*" is for a set one. The number of lines is arbitrary but the number of pixels per line currently 
is confined to 8, 16 or 32 pixels. Here is an example:
</p>

<pre>
  &lt;custom-dither-pattern&gt;
   &lt;pattern&gt;
    &lt;line&gt;.......................*........&lt;/line&gt;
    &lt;line&gt;...**..................*........&lt;/line&gt;
    &lt;line&gt;.......................**.......&lt;/line&gt;
    &lt;line&gt;..*.....................*******.&lt;/line&gt;
    &lt;line&gt;...............*..............*.&lt;/line&gt;
    &lt;line&gt;*..........*****..............*.&lt;/line&gt;
    &lt;line&gt;*........*.....*..............*.&lt;/line&gt;
    &lt;line&gt;*.....*.......*...............*.&lt;/line&gt;
    &lt;line&gt;*****.........*...............*.&lt;/line&gt;
    &lt;line&gt;..............................*.&lt;/line&gt;
    &lt;line&gt;............*.....*****.......**&lt;/line&gt;
    &lt;line&gt;...........*.....**...*.........&lt;/line&gt;
    &lt;line&gt;..........*.....**....*.........&lt;/line&gt;
    &lt;line&gt;.........*...........*..........&lt;/line&gt;
    &lt;line&gt;.......*......*......*..........&lt;/line&gt;
    &lt;line&gt;......*.....**..................&lt;/line&gt;
    &lt;line&gt;.......*..*........*............&lt;/line&gt;
    &lt;line&gt;*......****........*....*.......&lt;/line&gt;
    &lt;line&gt;*......**........*.....**.......&lt;/line&gt;
    &lt;line&gt;**.....................**.......&lt;/line&gt;
    &lt;line&gt;.****..........*......***.......&lt;/line&gt;
    &lt;line&gt;......***....**.....*...*.......&lt;/line&gt;
    &lt;line&gt;.......**....*......*...*.......&lt;/line&gt;
    &lt;line&gt;.......*.....*....*.....*.......&lt;/line&gt;
    &lt;line&gt;.......*.....****......*........&lt;/line&gt;
    &lt;line&gt;......*.......**................&lt;/line&gt;
    &lt;line&gt;.....*................*.........&lt;/line&gt;
    &lt;line&gt;.....*................*..**.....&lt;/line&gt;
    &lt;line&gt;....*.................*****.....&lt;/line&gt;
    &lt;line&gt;....**....................*.....&lt;/line&gt;
    &lt;line&gt;.....******...............*.....&lt;/line&gt;
    &lt;line&gt;..........**....................&lt;/line&gt;
   &lt;/pattern&gt;
   &lt;order&gt;1&lt;/order&gt;
   &lt;name&gt;Irregular&lt;/name&gt;
  &lt;/custom-dither-pattern&gt;
</pre>

<p>
A layer properties list can also hold custom line style pattern which are referred to by the 
"line-style" element of the property definitions using "Cx" values:
</p>

<pre>
&lt;layer-properties&gt;
 ...
  &lt;custom-line-style&gt;
   &lt;pattern&gt;(pattern line)&lt;/pattern&gt;
   &lt;order&gt;(order index)&lt;/order&gt;
   &lt;name&gt;(name)&lt;/name&gt;
  &lt;/custom-line-style&gt;
&lt;/layer-properties&gt;
</pre>

<p>
The order index is a number specifying the order which the styles are presented in 
the styles list. Independently of that, the first pattern is referred to as "C0", the
second as "C1" and so on.
"name" gives the name under which the style appears in the list.
</p>

<p>
The line pattern is given as a string where a "." is for a non-set pixel while
a "*" is for a set one. The number of pixels currently is confined to 32 max.
</p>

<pre>
  &lt;custom-line-style&gt;
   &lt;pattern&gt;*.*.*.***.***.***.*.*.*..&lt;/pattern&gt;
   &lt;order&gt;1&lt;/order&gt;
   &lt;name&gt;SOS&lt;/name&gt;
  &lt;/custom-line-style&gt;
</pre>

<h2>Multi-Tab Layer Files</h2>

<p>
Multi-Tab files simply embed multiple "layer-properties" elements in another root
element called "layer-properties-tabs". In that case, each "layer-properties" element
specifies a name which is used as the tab's display text. The name can be empty in 
which case the tabs are simply numbered:
</p>

<pre>
&lt;layer-properties-tabs&gt;
 &lt;layer-properties&gt;
  ...
  &lt;name&gt;Tab 1&lt;/name&gt;
 &lt;/layer-properties&gt;
 &lt;layer-properties&gt;
  ...
  &lt;name&gt;Tab 2&lt;/name&gt;
 &lt;/layer-properties&gt;
 ...
&lt;/layer-properties-tabs&gt;
</pre>

<p>
Please note that if you use custom fill pattern, each set must be specified
individually per tab.
</p>

<h2>Property Definition Blocks</h2>

<p>
An example for a property definition block is:
</p>

<pre>
 &lt;expanded&gt;true&lt;/expanded&gt;
 &lt;frame-color&gt;#ff80a8&lt;/frame-color&gt;
 &lt;fill-color&gt;#ff80a8&lt;/fill-color&gt;
 &lt;frame-brightness&gt;0&lt;/frame-brightness&gt;
 &lt;fill-brightness&gt;0&lt;/fill-brightness&gt;
 &lt;dither-pattern&gt;I9&lt;/dither-pattern&gt;
 &lt;line-style&gt;I4&lt;/line-style&gt;
 &lt;valid&gt;true&lt;/valid&gt;
 &lt;visible&gt;true&lt;/visible&gt;
 &lt;transparent&gt;false&lt;/transparent&gt;
 &lt;width&gt;1&lt;/width&gt;
 &lt;marked&gt;false&lt;/marked&gt;
 &lt;xfill&gt;false&lt;/xfill&gt;
 &lt;animation&gt;0&lt;/animation&gt;
 &lt;name&gt;Display name&lt;/name&gt;
 &lt;source&gt;1/0@1&lt;/source&gt;
</pre>

<p>
The definition of these properties is the following:
</p>

<table>
  <tr>
    <th>Element</th>
    <th>Value</th>
  </tr>
  <tr>
    <td><b>expanded</b></td>
    <td>Applies to group nodes. If 'true', the group node is expanded (shows the child elements). If 'false', the node is collapsed.</td>
  </tr>
  <tr>
    <td><b>frame-color</b></td>
    <td>The color of the frames (the pen in which is outer edges of the shapes are drawn) in HTML notation (#rrggbb)</td>
  </tr>
  <tr>
    <td><b>fill-color</b></td>
    <td>The color of the fill pattern inside the shapes in HTML notation (#rrggbb)</td>
  </tr>
  <tr>
    <td><b>frame-brightness</b></td>
    <td>This value modifies the brightness of the frame color. 0 is unmodified, -100 roughly adds 50% black to the color which +100 roughly adds 50% white.</td>
  </tr>
  <tr>
    <td><b>fill-brightness</b></td>
    <td>This value modifies the brightness of the fill color. See "frame-brightness".</td>
  </tr>
  <tr>
    <td><b>dither-pattern</b></td>
    <td>This is the number of the dither pattern used to fill the shapes. The values are "Ix" for one of the 
        built-in pattern where "I0" is "solid" and "I1" is "clear". "Cx" is one of the custom pattern if
        these are defined (see above).</td>
  </tr>
  <tr>
    <td><b>line-style</b></td>
    <td>This is the number of the line style used to draw the shape boundaries. An empty string is "solid line".
        The values are "Ix" for one of the 
        built-in styles where "I0" is "solid", "I1" is "dotted" etc. "Cx" is one of the custom styles if
        these are defined (see above).</td>
  </tr>
  <tr>
    <td><b>valid</b></td>
    <td>This is a boolean value ("true" or "false") indicating whether the entry is valid or not.
        Invalid layers are drawn but shapes on those layers can't be selected.
    </td>
  </tr>
  <tr>
    <td><b>visible</b></td>
    <td>This is a boolean value ("true" or "false") indicating whether the entry is visible or not.</td>
  </tr>
  <tr>
    <td><b>transparent</b></td>
    <td>This is a boolean value ("true" or "false") indicating whether the entry is transparent or not.
        Transparency is implemented in terms of bitwise-OR of the colors with dark background and 
        bitwise-AND of the colors with white background, so the effect is dependent on the bit 
        pattern of the RGB color triplets involved.
    </td>
  </tr>
  <tr>
    <td><b>width</b></td>
    <td>This is the line width of the frame in pixels (or empty for the default which is 1).</td>
  </tr>
  <tr>
    <td><b>marked</b></td>
    <td>This is a boolean value ("true" or "false") indicating whether the entry is marked (drawn with small crosses) or not.</td>
  </tr>
  <tr>
    <td><b>xfill</b></td>
    <td>This is a boolean value ("true" or "false") indicating whether boxes are drawn with a diagonal cross.</td>
  </tr>
  <tr>
    <td><b>animation</b></td>
    <td>This is a value indicating the animation mode. 0 is "none", 1 is "scrolling", 2 is "blinking" and 3 is "inverse blinking".</td>
  </tr>
  <tr>
    <td><b>name</b></td>
    <td>This is the display name. The display name is the text which is shown for this entry. If no text 
      is given, a text will be generated from the layer, datatype and layer name.</td>
  </tr>
  <tr>
    <td><b>source</b></td>
    <td>This is the source where the shapes are taken from. That is a string describing the layout, layer, datatype and 
      selectors or transformations (see <a href="doc/about/layer_sources.html">here</a> for a detailed description of that 
      string). A source can partial, in which case it will provide defaults for child entries of an entry.</td>
  </tr>
</table>


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