Cannot read property 'x' of null

[viveleroi]

Trying this project out for a PIXIjs v4.3.0 project. I'm using pixi-particles 2.0.0.

I'm loading a rain system, taken from your interactive generator with some tweaks from the base config.

Following the example on the readme, I've initialized the emitter with my container and emitter config, set emit = true and am calling the update method.

Yet with just these few steps, it's breaking with the error:

Cannot read property 'x' of null:
node_modules/pixi-particles/dist/pixi-particles.js:1519
		var curX = this.ownerPos.x + this.spawnPos.x;

Here's an example of my class:

const rain = require('../particles/rain.json');

// Load pixi particles, which patches PIXI
require('pixi-particles/dist/pixi-particles');

module.exports = class Weather {
    constructor() {
        // Initialize a render container
        this.container = new PIXI.Container();

        this.emitter = this.initRainEmitter();

        PIXI.ticker.shared.add(this.tick, this);
    }

    initRainEmitter() {
        return new PIXI.particles.Emitter(this.container, rain);
    }

    start() {
        this.raining = true;
        this.emitter.emit = true;
    }

    tick(delta) {
        if (this.raining) {
            this.emitter.update(delta);
        }
    }
};

This class is then loaded in my game by a parent container, like this:

this.weather = new Weather();
this.container.addChild(this.weather.container);
this.weather.start();

[amrelhady]

Are you missing art parameter when initialising Emitter?

https://github.com/pixijs/pixi-particles/blob/master/examples/js/ParticleExample.js#L118

emitter = new PIXI.particles.Emitter(
	emitterContainer,
	art,
	config
);

art is array of particle images. For example:

art = [PIXI.Texture.fromImage('img/particles.png')]

[andrewstart]

Sorry, this one fell through the cracks while I was on vacation. amrelhady is correct - the 2nd parameter of the Emitter constructor is one of or an array of PIXI.Texture instances you have prepared, or urls to images to load (passed to PIXI.Texture.fromImage()).