Jumper

Jumper is a pathfinding library designed for uniform-cost 2D grid-based games. It aims to be lightning fast and lightweight. It also features a clean public interface with chaining features which makes it very friendly and easy to use.

Technical notes

Jumper implements a lots if search algorithms: A-star, Dijkstra, Breadth-First search, Depth First search and Jump Point search (the fastest amongst all).

A benchmark program running in console is available on Github. It features a set of 132 maps from the 2012 Grid-based Path Planning Competition.

Usage

Jumper is easy to use. Here is a basic example using the latest version available.

-- Usage Example
-- First, set a collision map
local map = {
    {0,1,0,1,0 },
    {0,1,0,1,0 },
    {0,1,1,1,0 },
    {0,0,0,0,0 },
}
-- Value for walkable tiles
local walkable = 0
 
-- Library setup
local Grid = require ("jumper.grid") -- The grid class
local Pathfinder = require ("jumper.pathfinder") -- The pathfinder lass
 
-- Creates a grid object
local grid = Grid(map) 
-- Creates a pathfinder object using Jump Point Search
local myFinder = Pathfinder('JPS', grid, walkable) 
 
-- Define start and goal locations coordinates
local startx, starty = 1,1
local endx, endy = 5,1
 
-- Calculates the path, and its length
local path, length = myFinder:getPath(startx, starty, endx, endy)
if path then
  print(('Path found! Length: %.2f'):format(length))
    for node, count in path:iter() do
      print(('Step: %d - x: %d - y: %d'):format(count, node.x, node.y))
    end
end
 
--> Output:
--> Path found! Length: 8.83
--> Step: 1 - x: 1 - y: 1
--> Step: 2 - x: 1 - y: 3
--> Step: 3 - x: 2 - y: 4
--> Step: 4 - x: 4 - y: 4
--> Step: 5 - x: 5 - y: 3
--> Step: 6 - x: 5 - y: 1

Jumper offers a lot more options to customize the pathfinding behavior. Please, kindly check out the Readme to figure them out.

Feedback

If you have any question, proposal, idea to improve, or if you are just using Jumper in a project, I would love to hear your feedback. Issues/suggestions can be posted on the project issue tracker on Github, or by e-mail.

Links

• Source
• Forum thread
• README.md
• Demos