Libgdx Collision Detection with TiledMap

Question

I'm struggling with implementing a collision detection system through the tiledmap. I have a 2d "pokemon style" game that has a tiled map rendered. Specifically, I have a 'collision' layer in my tiled map .tmx file that I want to interact with the player and other entities. My question is how do I connect the player sprite (extends Sprite class) to the 'collision' layer of the tiledmap and cause collision between the two. Any advice is appreciated.

Answer 1

First of all your Player should probably not extend Sprite, because your player is usually much more than a Sprite. It probably consists of several sprites or even Animations. Keep a sprite as a property of the player.

The question itself has already been adressed several times. You usually need the following steps:

1. Find the collision layer in your map
2. Extract all objects from this layer
3. Check each of those objects for a collision

In code this might look a bit like this:

int objectLayerId = 5;
TiledMapTileLayer collisionObjectLayer = (TiledMapTileLayer)map.getLayers().get(objectLayerId);
MapObjects objects = collisionObjectLayer.getObjects();

// there are several other types, Rectangle is probably the most common one
for (RectangleMapObject rectangleObject : objects.getByType(RectangleMapObject.class)) {

    Rectangle rectangle = rectangleObject.getRectangle();
    if (Intersector.overlaps(rectangle, player.getRectangle()) {
        // collision happened
    }
}

Some more links which you might be interested in:

• Java Tiled Map Game (LibGDX) | Episode 4 - collision detection
• Java Tiled Map Game (LibGDX) | Episode 4 update - better collision detection implementation
• Android Game Development with libgdx – Collision Detection, Part 4
• SuperKoalio example game with TiledMaps and collision