T2D A-star pathfinding stuffs

I wrote a C++ A-star "extension" for T2D, and a script demo that shows off it's features. I submitted a resource, but it's still waiting on approval. I think I can link to it though:
www.garagegames.com/index.php?sec=mg&mod=resource&page=view&qid=9711

Here's a short overview:

There are two new script objects, a pathGrid2D and a path. One pathGrid can contain many paths, and it's designed so that each unit in your app that needs to find paths can have it's own path object.

The pathGrid contains all pathability data. To set it up, you assign it a tileLayer that's the size and shape of what you want to path on. The most obvious tileLayer to use is your actual game field, although you could just as easily make a special tileLayer that only contained your passablility data.

Path objects will pass back world coordinates based on this tileLayer. It's pretty simple really... you get coords along a path that avoids obsatcles on your tileLayer. All passability data is set in the tileCustomData fields. To set a tile as "blocked", set the tileCustomData to "10", to set it as "open", set it to "0" or nothing. To set an "avoidence weight" for a tile, set it to any value between 0 and 10. Higher values will be more avoided than lower values.

As I mentioned, you can get a world coordinate and/or world angle at any point on a generated path. Just pass in a distance, and you get a coord. You can do anything you like then, like use setPosition(), moveTo(), etc. Just keep getting the next coord on the path until you reach the end!

You can get postion coords or angles on a linear path, or a spline path.

Here's basically how you use it:

// make a pathGrid
$pathGrid = = new pathGrid2d(){ scenegraph = t2DSceneGraph; } ;
//assign a tileLayer
$pathGrid.setTileLayer( $tLayer );
// make a path (pass in start and end coords)
$path1 = $pathGrid.createPath("0 0", "100 -215" );
//get coords and angle at distance 10 along path
%myCoord = $path1.getSplineWorld( 10 );
%myAngle = $path1.getSplineAngle(10);
// do the path thing
$spritey.moveTo( %myCoord );
$spritey.rotateTo( %myAngle );

Of course you can get trickier, but that's the basics! Simple, huh?

There's lots of other cool stuff, like debugging symbols to show you where the nodes are being searched and the path that is found, path node pruning, and more. Check it out and let me know what you think!