Creating Zone/Area:

Some times we may want to create zone/area in our game, to execute certain actions after entering or leaving certain zone/areas. I previously explained how to do it for physical objects such as bodies using sensors (check this article - click) In this example, we will do it with different way, without physics involved, also we will constantly checking if player is inside zone, using update handler.

All we have to do is to create new Sprite - visual representation of our zone/area, and override onManageUpdate() - take a look at example below:

Sprite ourArea = new Sprite(x, y, 100, 300, textureRegion, vbo)
{
     @Override
     protected void onManagedUpdate(float pSecondsElapsed)
     {
         if (player.collidesWith(this))
         {                                                              
             // execute actions
             // while player is inside area (colliding/overlapping)
         }
     };
};

Note that in this example "player" object is our player Sprite. Where can we use it? For example while player is inside some kind of area, apply certain force on his physical body, for example to make gravity stronger, and so on, depends on your needs. In this example, we used Sprite, so we assume that this "area" will have some kind of texture region, if you do not need any image for this area (make it blank) use Entity class.