Collision and overlap in a tilemap problem.

nekomasterdeluxe

Hi, im new to haxeflixel ( and programming mostly) and im stuck with a problem in a TD game im trying to create.

Im trying to spawn enemies from _spawn, find a path to _player, and get killed once they touch _player. Up to this point, eveything was fine, but when i added a tilemap flxg.overlap and flxg.collide either don't work, or break the tilemap.

my problem

I've noticed overlap gets called every frame, so it's checking collision with the map itself i believe, not with the Player entity.The .kill() method is also breaking it in other version of this same problem (calling a die function in the Enemy class, wich is just super.kill();).

So my question is, how do i check for collision between _enemy (wich comes from a group) and _player in my situation? Is there a simple answer that im missing?

Im being flagged as spam when i try to post code or links, so ive put some of my code here: https://www.itextpad.com/codeicantpost and here http://codepad.org/o7Vg9ijH

Thank you for reading my problem guys.

DleanJeans

The problem is you don't add new enemy to enemyGroup.

Hold on! I'm on my phone and I'm writing a more detailed answer.

nekomasterdeluxe

Thank you for the quick reply man, sorry i cant put more links or code, im being flagged spammer when i try, lol.

I thought i added enemies here:

	var enemies = new FlxTypedGroup<Enemy>();
	_enemy = enemies.recycle(Enemy);
	_enemy.setPosition(_spawner.getPosition().x, _spawner.getPosition().y);
add(_enemy);

DleanJeans

Take a look at the first block of code in spawnEnemy()

		//enemy group
		var enemies = new FlxTypedGroup<Enemy>();
		_enemy = enemies.recycle(Enemy);

You already have enemyGroup, you don't need to create a new enemy group anymore.

Hence it should be

		// var enemies = new FlxTypedGroup<Enemy>(); delete this
		_enemy = enemyGroup.recycle(Enemy);

And at the third block:

		add(_enemy); // this only adds the enemy to the state not enemyGroup
		_enemiesToSpawn--;
		_spawnCounter = 0;
		trace("enemy spawned");

Replace the first line with:

enemyGroup.add(_enemy);

For all of that to work, you forgot/need to add this in create():

enemyGroup = new FlxTypedGroup<Enemy>()
add(enemyGroup);

nekomasterdeluxe

I tried it and it works perfectly!!

Seriously thank you so much for using up your time to explain this to me, now it seems so simple, haha.

DleanJeans

By the way:

FlxG.overlap() only checks for collision. FlxG.collide() will apply some simple physics upon the collision.
And instead of this

_spawnCounter += Std.int(FlxG.timeScale);
if (_enemiesToSpawn > 0 && _spawnCounter > _spawninterval * FlxG.updateFramerate )

Maybe you want:

_spawnCounter += elapsed; // _spawnCounter need to be Float
if (_enemiesToSpawn > 0 && _spawnCounter > 2) // spawn every 2 seconds for example

FlxG.timeScale is used to change the speed of the game and it's 1 by default.
New forum users can't post many posts in a short time.

nekomasterdeluxe

I wanted to have a fast foward like Defenders Quest, so i thought that linking spawn rate to framerate was the way to go.

Am i overthinking it (its a solution from the TD demo)? Maybe seconds is simpler, i'll try it out. Thank you.

Collision and overlap in a tilemap problem. browsing