Collision Detection on Single Item in Group

[lobsterhands]

GameState.prototype.create = function() {this.pipe = game.add.group();    this.game.physics.enable(this.pipe, Phaser.Physics.ARCADE);    this.pipe.createMultiple(1, 'pipe');    for (var i = 0; i < 1; i++) {      var block1 = this.game.add.sprite(x, y, 'pipe')      var block2 = this.game.add.sprite(x, y, 'pipe')      this.pipe.add(block1);      this.pipe.add(block2);    }}GameState.prototype.update = function() {  game.physics.arcade.collide(this.player, this.pipe, collisionHandler, null, this);}function collisionHandler (obj1, obj2) {    game.stage.backgroundColor = '#992d2d';}

 

The above code works properly to change the background color when the player touches a block. Yay! However, I'm trying to get the update (in this case, background color change) to occur only when the player touches block1. I've tried:

GameState.prototype.update = function() {  game.physics.arcade.collide(this.player, this.block1, collisionHandler, null, this);}

as well as 

GameState.prototype.update = function() {  game.physics.arcade.collide(this.player, this.pipe.block1, collisionHandler, null, this);}

The game runs, but no update occurs. Any ideas?

 

 

 

 

[Heppell08]

Make the variables global. Have the blocks in global variable and then use the update code to change the colours.

[lobsterhands]

Heppell, thanks for the response. I understand what you mean when you say make them global, but I don't know how to achieve that with my current set up. Do I need to change the code completely (as in create the blocks outside of a 'for loop') or can I simply share the information inside that loop with the rest of the code easily? 

 

If this seems like a question coming from a noob, it totally is.

[Heppell08]

Where ever it is you place your vars just put var block1 in with the rest of the vars. Example, you'll have

var player;

var block1;

var block2;

Do that, then when you create the group, instead of having var block1 in the group creation, just have it as block1.

That's basically it. Hopefully that helps a bit more

[blackgames]

If you create this once or adding in equal intervals you can (I think so - not tested) use pipes.getAt(posOfBlock1)

[lobsterhands]

@Heppell08, I didn't do this exactly, but you pointed me in a good direction. I got it working. Thank you very much.

[Heppell08]

I'm glad I got you in the right direction of a working method.

[lobsterhands]

Okay, I played with simply declaring the variable in the preload() function, called it in the update() function and everything works. Much cleaner than what I came up with the first time. Thanks again.

[Heppell08]

No problem, I'm not a fan of always declaring every variable as global but 9 times out of 10 its probably safer to do so because phaser can upsate any global you declare and use

[Heppell08]

Also, I have tried declaring a private var and updating it in update and failed so put it global and had success.