le. The a-component
steps south-east and the b-component south-west:
</p>

<img src="_aidev3.gif" />

<p>
The base tile always has the coordinate (0,0).
</p>

<p>
Relative coordinates have a <i>distance</i> property which is similar to that of polar coordinates. It combines a and b component to tell the distance regardless of the direction. The distance is counted by stepping single tiles with the least possible result, where a short step (along a or b axis) counts 2 and a long step (north-south or east-wes