Coordinates issue vertical scroll Libgdx

Question

I'm going crazy with this problem. I'll explain:

I have a camera that falls down (flowing along the y-axis) which displays a TiledMap and declare the whole in this way:

In the create method:

map=new TmxMapLoader().load("Map.tmx");
this.renderer=new OrthogonalTiledMapRenderer(map);
this.camera=new OrthographicCamera(Gdx.graphics.getWidth(),Gdx.graphics.getHeight());
this.camera.translate(Gdx.graphics.getWidth()/2,Gdx.graphics.getHeight()/2);
this.camera.update();

In the render method:

this.renderer.setView(camera);
this.renderer.render();
camera.position.y+=1;
camera.update();

Then I have also a sprite drawing by SpriteBatch in the render method:

batchM.begin();
sprite.draw(batchM);
batchM.end();

In the tiledmap there are MapObject and I have to check if this objects hit to sprite and I do this so in the render method:

MapObjects collisionObjects =  map.getLayers().get("objects").getObjects();
        for(MapObject object : collisionObjects) {

               if (object instanceof RectangleMapObject) {
                   RectangleMapObject rect = ((RectangleMapObject) object);
                   Vector3 coo=camera.project(new Vector3(rect.getRectangle().x,rect.getRectangle().y,0));
                    com.badlogic.gdx.math.Rectangle Sprite= sprite.getBoundingRectangle();
                    com.badlogic.gdx.math.Rectangle Map=new com.badlogic.gdx.math.Rectangle(coo.x,coo.y,32,32);
                    //TEST
                   System.out.println("PLAYER X: "+Sprite.x+" Y: "+Sprite.y);
                   System.out.println("Object X: "+Map.x+" Y: "+Map.y);
                   if(Intersector.intersectRectangles(Sprite, Map, Sprite)) System.out.println("HIT");
          } }

My problem is that when I do not change the window size(remain the size the starting), collisions are detected fine, but when I change the window size (for example, I enlarge) collisions are not detected and I can not explain why.

Could you help me to fix this bug. Thank you for your time

Answer 1

The SpriteBatch has its own internal camera. Are you also setting the batcher to use the camera's combined projection matrix by calling:

       batchM.setProjectionMatrix(camera.combined);

The problems you could be experiencing, could perhaps be explained by the fact that collisions only appear to be happening on screen, but actually aren't as the map and the sprites are using two different coordinate systems which have been overlayed over one another. The coordinate systems just happen to correspond when the screen is its initial size, but when resized, diverge from the model. Then again, perhaps not. Without more code, I can't really tell.