pathfinding - APACHE LICENSE 2.0
A java pathfinding library meant to be used for games. It is generic enough to be used in different kind of graphs (though, right now it only has implementation for grid graphs).
This library works with Libgdx's html5 backend, it was even used in my #1GAM january entry.
The library has been uploaded to sonatype oss repository. If you are using libgdx you can install it via graddle adding this dependency to your core project:
There's also the gdx-bridge extension to easily get pathfinding features in your game directly from your tmx maps.
The library works on a bunch of interfaces:
- NavigationNode: this basically just represents a node of a graph. contains some getters and setters meant for navigation. Right now, only implementation is GridCell
- NavigationGrap: a group of navigation nodes. Right now, only implementation is NavigationGrid
- PathFinder: the implementation for the pathfinding algorithm, current options are:
Finders are fed with so called PathFinderOptions, which determine how the pathfinding will work (allowing diagonal movement, for example).
How to use
You need to create a graph. Be aware the the NavigationGrid class, expects a bidimensional array of GridCell stored as [x][y]
//these should be stored as [x][y] GridCell cells = new GridCell; //create your cells with whatever data you need cells = createCells(); //create a navigation grid with the cells you just created NavigationGrid<GridCell> navGrid = new NavigationGrid(cells);
Now, you need a finder which can work on your graph.
//create a finder either using the default options AStarGridFinder<GridCell> finder = new AStarGridFinder(GridCell.class); //or create your own pathfinder options: GridFinderOptions opt = new GridFinderOptions(); opt.allowDiagonal = false; AStarGridFinder<GridCell> finder = new AStarGridFinder(GridCell.class, opt);
Once you have both, a graph and a finder, you can find paths within your graph at any time.
List<GridCell> pathToEnd = finder.findPath(0, 0, 4, 3, navGrid);
That's pretty much all there is to using the library.