Cedric Posted April 20, 2016 Share Posted April 20, 2016 Dear people of this awesome community, I am strugeling to get the spawning system working. I keep getting the error: src\js\objects\Barrier.js:9 Uncaught TypeError: Cannot read property 'width' of undefined(…); Barrier.js : import GlobalVars from "./GlobalVars"; import playGame from "../States/PlayGame"; class Barrier extends Phaser.Sprite { constructor(game, state, speed, tintColor) { super(game); this.game = game; this.state = state; var positions = [(this.game.width - GlobalVars.tunnelWidth) / 2, (this.game.width + GlobalVars.tunnelWidth)/2]; var position = this.game.rnd.between(0, 1); Phaser.Sprite.call(this, game, positions[position], -100, "barrier"); var cropRect = new Phaser.Rectangle(0, 0, GlobalVars.tunnelWidth /2, 24); this.crop(cropRect); game.physics.enable(this, Phaser.Physics.ARCADE); this.anchor.set(position, 0.5); this.tint = tintColor; this.body.velocity.y = speed; this.placeBarrier = true; console.log("barrier placed"); } update() { if (this.placeBarrier && this.y > GlobalVars.barrierGap) { this.placeBarrier = false; playGame.prototype.addBarrier(this.parent, this.tintColor); } if (this.y > this.game.height) { this.destroy(); } } } export default Barrier; import GlobalVars from "../objects/GlobalVars"; import Barrier from "../objects/Barrier"; class playGame extends Phaser.State { constructor(game) { super(game); } create() { console.log("game starts running"); //setting general color this.tintColor = GlobalVars.currentColor; //tunnel this.createTunnel(); //ship this.createShip(); //smoke particle effect this.createSmoke(); //barriers this.barrierGroup = this.add.group(); this.addBarrier(this.barrierGroup, this.tintColor); } update() { this.updateSmoke(); this.checkForSwipe(); } ..... addBarrier(group, tintColor) { var barrier = new Barrier(this.game, this, GlobalVars.barrierSpeed, tintColor); this.add.existing(barrier); group.add(barrier); } } export default playGame; I am following a book I bought called: create HTML5 vertical endless runner. can anyone hint a tutorial or give a solution? Thanks in advance Very Kind regards, Cedric Link to comment Share on other sites More sharing options...
drhayes Posted April 20, 2016 Share Posted April 20, 2016 What's calling addBarrier? EDIT: My guess is that the thing that is calling addBarrier is losing its context, so the value of "this" isn't what you think it is. I bet it's the window. The window doesn't have a game, so neither does your sprite. Cedric 1 Link to comment Share on other sites More sharing options...
Cedric Posted April 20, 2016 Author Share Posted April 20, 2016 1 hour ago, drhayes said: What's calling addBarrier? EDIT: My guess is that the thing that is calling addBarrier is losing its context, so the value of "this" isn't what you think it is. I bet it's the window. The window doesn't have a game, so neither does your sprite. in the book it is the prototype itself which is calling the addBarrier method. So I called it inside the class. But I have no idea how to use it or fix it :/ Link to comment Share on other sites More sharing options...
Cedric Posted April 20, 2016 Author Share Posted April 20, 2016 I fixed the issue by passing in the game as a parameter. The problem was that I was referencing the game of the current class which was declared differently. So when I used the right declaration and passed it in as the game parameter then it worked like it should. Link to comment Share on other sites More sharing options...
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