libgdx - collision detection with tiled map java

Question

currently, I am working on a 2d rpg game which is similar to final fantasy 1-4. I can load up a tiled map and the sprite can walk freely on the map. However, I will like to create a wall for it to stop walking through it.

I created three tiled layer Background, Collision, Overhead and one Collision object layer with rectangles only.

"How do I handle collisions with the object layer in the tiled map?"

"Do I have to create every single rectangle that is in the object layer with Rectangle rectangle = new Rectangle() and rectangle.set(x, y, width, height)in the code?"

Thank you very much in advance. Any help is greatly appreciated!

Answer 1

What I normally have for simple tile map collision, I have a separate tile set with only 2 types of tiles that I use to create a new layer called collision. When I load in a tiled map, I use this layer to create a boolean array version of the map where passability is determined by a tile's id.

Answer 2

If the map is loaded in through pixels, then the tile id's will be in a 2d array, so add something like this to your player class (if you have one, you might do tile-based rpgs completely differently):

public void move(int xs, int ys) {
    xo += xs;
    yo += ys;
    if(Level.tiles[xo / 32][yo / 32] == 6) {
        xo -= xs;
        yo -= ys;
    }

}

xs and ys is the speed that the character is travelling at.

xo and yo is the player position

Level.tiles[xo][yo] is the 2d array that stores the id of the tile

the move method is the method that sets the player position after the xs/ys values have been set

Answer 3

Yup there are multiple ways you can go around completing this and it really depends on how you are implementing a movement system and if there's a physics engine in the game. If there is no physics engine in your game and you move only by touching squares, I would suggest you implement a future check system. Where you have a large 2d array that hold the relevant collision for each square. Every time you move the sprite you check whether the move will push him into a new square. If so pull it up on the array and determine what to do! :)

Answer 4

It's not that difficult, just loop through all the map objects in the layer and add if they're a rectangle map object then add them to an array of all the objects in the room. You can then add a move request system in which you create a method that will check if the space you are going to move to contains a collision object and if it does then deny the request else let them move.