Collision with walls

[stingerhorse]

Hi there!
I'm currently working on a roguelike game but I can't get any further with the player colliding with walls. I've created the wall as an entity and two variables which have always the value of the current x and y position of the player. If the player collides with the wall, he would be set back to his previous coordinates. The collision gets detected, but I wasn't able to figure out how to give the coordinates to a variable. I think I have to proceed in a completely different way.
Thanks for any advice!

[AlmasB]

Hi @stingerhorse

Have a look at this example. I think it does something similar to what you are trying to achieve. Let me know if it works.

[fleggs]

Is it possible to add a FollowComponent to an entity with a PhysicsComponent? Because the FollowComponent comes with an own speed which I think isn't accepted by the PhysicsComponent, so the entity just doesn't move. Is it possible to make an entity follow the player, but also participating in the PhysicsWorld?

[stingerhorse]

I am struggling with it too. I tried to set the velocity from the PhysicsComponent of the entity to the speed of the FollowComponent:

entity.getComponent(PhysicsComponent.class).setVelocityX(entity.getComponent(FollowComponent.class).getSpeed()); entity.getComponent(PhysicsComponent.class).setVelocityY(entity.getComponent(FollowComponent.class).getSpeed());

Thought it would be a good idea but it's not working :-/

[fleggs]

Anybody else has an idea? I appreciate every answer.

[lhDream]

You can talk about the functions you want to achieve, and there may be alternative solutions.

[AlmasB]

Is it possible to add a FollowComponent to an entity with a PhysicsComponent?

There is no built-in component that does this. However, one can easily build something similar for PhysicsComponent.

Let e1 and e2 be entities with PhysicsComponent, such that e1 follows e2. Given we know positions of both entities, all that remains is to use these positions to calculate e1 velocity and apply via the component.