<span style="font-weight: bold;"></span>Nine attributes hold the information about a tile.
This can be seen in the <a href="landscape.html">Landscape</a> document. This page tries to give an overview of used and free bits of
the array so you can quickly see what is used and what is not.
<ul>
<li><span style="font-weight: bold;"><span class="free">O</span></span> - bit is free</li>
<li><span style="font-weight: bold;"><span class="used">X</span></span> - bit is used</li>
<li><span style="font-weight: bold;"><span class="abuse"> </span></span> - bit of attribute is abused for different purposes, i.e. other bits define the actual meaning.</li>
<li><span style="font-weight: bold;"><span class="option">~</span></span> - bit is accessed, but does not really have a meaning (e.g. owner of clear land is always OWNER_NONE)</li>
</ul>
<p>
<ul>
<li><span style="font-weight: bold;">type</span> - 8 bits in size, tile class (bits 4..7), bridge (bits 2..3) tropic zone (bits 0..1, only valid in tropic climate)</li>
<li><span style="font-weight: bold;">m1</span> - 8 bits in size, used to identify the owner of that tile (eg piece of rail, bridge, etc.)</li>
<li><span style="font-weight: bold;">m2</span> - 16 bits in size, used to identify the index of the given tile (object) in the (object-)array</li>
<li><span style="font-weight: bold;">m3</span> - 8 bits in size, is used for general storage</li>
<li><span style="font-weight: bold;">m4</span> - 8 bits in size, is used for general storage</li>
<li><span style="font-weight: bold;">m5</span> - 8 bits in size, is used for general storage</li>
<li><span style="font-weight: bold;">m6</span> - 8 bits in size, is used for general storage</li>
<li><span style="font-weight: bold;">m7</span> - 8 bits in size, is used for general storage</li>
<li><span style="font-weight: bold;">m8</span> - 16 bits in size, is used for general storage</li>
</ul>
<p>
<ul>
<li><span style="font-weight: bold;"><span class="free">O</span></span> - bit is free</li>
<li><span style="font-weight: bold;"><span class="usable">X</span></span> - bit is used, but could be freed if needed</li>
<li><span style="font-weight: bold;"><span class="used">X</span></span> - bit is used</li>
<li><span style="font-weight: bold;"><span class="pool">X</span></span> - bit is used for an index on a pool</li>
<li><span style="font-weight: bold;"><span class="patch">X</span></span> - bit is introduced by a patch</li>
<li><span style="font-weight: bold;"><span class="abuse">X</span></span> - bit of attribute is abused for different purposes, i.e. other bits define the actual meaning</li>
<li><span style="font-weight: bold;"><span class="rearrange">X</span></span> - bit is accessed, but a rearrangement of the map array could free some of these bits (probably not done for bit alignment)</li>
<td class="bits" rowspan=27><span class="used" title="Tile type">XXXX</span> <span class="used" title="Presence and direction of bridge above">XX</span> <span class="used" title="Tropic Zone: only meaningfull in tropic climate. It contains the definition of the available zones">XX</span></td>
<td class="bits"><span class="used" title="Type of hedge on NE border">XXX</span> <span class="used" title="Snow presence">X</span><span class="free">OOOO</span></td>
<td class="bits" rowspan=2><span class="used" title="Type of hedge on SW border">XXX</span> <span class="used" title="Type of hedge on SE border">XXX</span><span class="free">OO</span></td>
<td class="bits" rowspan=2><span class="used" title="House random bits">XXXX XXXX</span></td>
<td class="bits" rowspan=2><span class="pool" title="Town index on pool">XXXX XXXX XXXX XXXX</span></td>
<td class="bits"><span class="used" title="House is complete/in construction (see m5)">1</span> <span class="used" title="House type (m4 + m3[6])">X</span><span class="free">O</span><span class="usable" title="Activated triggers (bits 2..4 don't have a meaning)">XXX</span><span class="used" title="Activated triggers (bits 2..4 don't have a meaning)">XX</span></td>
<td class="bits" rowspan=2><span class="used" title="House type (m4 + m3[6])">XXXX XXXX</span></td>
<td class="bits"><span class="used" title="Age in years, clamped at 255">XXXX XXXX</span></td>
<td class="bits" rowspan=2><span class="abuse" title="Newhouses activated: periodic processing time remaining; if not, lift position for houses 04 and 05">XXXX XX</span><span class="free">OO</span></td>
<td class="bits" rowspan=2><span class="abuse" title="If newhouses active, m7 is the current animation frame">XXXX</span> <span class="abuse" title="If newhouses active, m7 is the current animantion frame; if not, lift behaviour for houses 04 and 05">XXXX</span></td>
<td class="bits"><span class="used" title="House is complete/in construction (see m5)">O</span> <span class="used" title="House type (m4 + m3[6])">X</span><span class="free">O</span><span class="usable" title="Activated triggers (bits 2..4 don't have a meaning)">XXX</span><span class="used" title="Activated triggers (bits 2..4 don't have a meaning)">XX</span></td>
<td class="bits"><span class="used" title="Number of trees on tile (+1)">XX</span><span class="free">OO O</span><span class="used" title="Tree growth">XXX</span></td>
<td class="bits" rowspan=2><span class="rearrange" title="Owner of tram (road only; a rearrangement can free some of these bits)">XXXX</span> <span class="free">OOOO</span></td>
<td class="bits"><span class="used" title="Bridge or tunnel bit">O</span><span class="free">OO</span><span class="rearrange" title="PBS reservation (rail; a rearrangement can free some of these bits)">X</span> <span class="used" title="Transport type">XX</span> <span class="used" title="Direction of the tunnel/bridge">XX</span></td>
<td class="bits" rowspan=2><span class="free">OO</span><span class="used" title="Snow/desert present">X</span><span class="rearrange" title="Owner of road (road only; a rearrangement can free some of these bits)">X XXXX</span></td>
<td class="bits" rowspan=2><span class="free">OOOO</span> <span class="used" title="Tram type">XXXX XX</span><span class="rearrange" title="Railway type (rail only; a rearrangement can free some of these bits)">XX XXXX</span></td>
<td class="bits"><span class="used" title="Bridge or tunnel bit">1</span><span class="free">OO</span><span class="rearrange" title="PBS reservation (rail; a rearrangement can free some of these bits)">X</span> <span class="used" title="Transport type">XX</span> <span class="used" title="Direction of the tunnel/bridge">XX</span></td>