Jumper Pathfinding node:getX problem

[NoAim91]

Hallo again,

I try since 3 days to implement a Pathfinding libary and i get frustred now. :-(

I copy/paste the Jumper example and it doesn´t work. The Error is "attempt to call method 'getX' (a nil value)

I don´t know how to get the path information out of the method.

Thanks for help again.

[4aiman]

Hi!
Are you sure you haven't transposed the map of the level? That would be a common error.

[NoAim91]

I have copy pasted all the stuff, including the map example. I think the map is transposed.

https://github.com/Yonaba/Jumper

Code: Select all

-- 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(grid, 'JPS', 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 = myFinder:getPath(startx, starty, endx, endy)
if path then
  print(('Path found! Length: %.2f'):format(path:getLength()))
    for node, count in path:nodes() do
      print(('Step: %d - x: %d - y: %d'):format(count, node:getX(), node:getY()))
    end
end

[4aiman]

That's strange. The example works just fine for me.

[NoAim91]

realy? When I create a new folder with a main.lua and the code above. In the same folder I placed the jumper folder. Than I run the code and get the error.

[4aiman]

Really-really
I've used Jumper in this little game: https://4aiman.itch.io/viwus-attawk, maybe that will help you with the library?

[Roland_Yonaba]

NoAim, please go to the latest stable version of Jumper here. Conveniently, you will find a small tutorial for you to get your hands-on quickly on the library. Have fun with Jumper.

[4aiman]

@Roland_Yonaba
It is *very* strange that when clonning I'm getting tagged version you've mentioned and not master branch.
Even strangier ( ) is the fact that the commit a2be178 made on 3 Mar 2013 is better than commit df4eb22 made on 12 Apr 2015.
Maybe an update to the readme file (to tell people to go get a tagged revision) will be posibble?