// In a Scene's create() method:

// Basic continuous emitter (flow mode)
const emitter = this.add.particles(400, 300, 'flares', {
    frame: 'red',
    speed: 200,
    lifespan: 2000,
    scale: { start: 1, end: 0 },
    alpha: { start: 1, end: 0 },
    gravityY: 150
});

// One-shot burst (explode mode)
const burst = this.add.particles(400, 300, 'flares', {
    frame: 'blue',
    speed: { min: 100, max: 300 },
    lifespan: 1000,
    scale: { start: 0.5, end: 0 },
    emitting: false   // don't auto-start
});
burst.explode(20);    // emit 20 particles at once

this.add.particles(x, y, texture, config);
// x, y: world position (both optional, default 0)
// texture: string key or Texture instance
// config: ParticleEmitterConfig object (optional, can call setConfig later)

x: 400                                        // static value
x: [100, 200, 300, 400]                       // random pick from array
x: { min: 100, max: 700 }                     // random float in range
x: { min: 100, max: 700, int: true }          // random integer
x: { random: [100, 700] }                     // random integer shorthand
scale: { start: 0, end: 1 }                   // ease over lifetime (default linear)
scale: { start: 0, end: 1, ease: 'bounce.out' }  // custom ease
scale: { start: 4, end: 0.5, random: true }   // random start, ease to end
x: { values: [50, 500, 200, 800], interpolation: 'catmull' }  // interpolation
x: { steps: 32, start: 0, end: 576 }          // stepped sequential
x: { steps: 32, start: 0, end: 576, yoyo: true }  // stepped with yoyo
x: {                                           // custom callbacks
    onEmit: (particle, key, t, value) => value,
    onUpdate: (particle, key, t, value) => value
}
x: (particle, key, t, value) => value + 50    // emit-time callback shorthand

emitter.flow(100, 5);           // 5 particles every 100ms
emitter.flow(100, 5, 50);       // auto-stop after 50 total
emitter.explode(30, 200, 400);  // burst 30 at position
emitter.explode(30);            // burst at emitter position

// Scale and alpha with custom easing
this.add.particles(400, 300, 'spark', {
    lifespan: 2000,
    speed: 100,
    scale: { start: 1, end: 0, ease: 'power2' },
    alpha: { start: 1, end: 0, ease: 'cubic.in' }
});

this.add.particles(400, 300, 'spark', {
    lifespan: 2000, speed: 100, scale: { start: 0.5, end: 0 },
    color: [0xfacc22, 0xf89800, 0xf83600, 0x9f0404], colorEase: 'quad.out'
});

this.add.particles(400, 300, 'spark', { tint: 0xff0000 });                           // static
this.add.particles(400, 300, 'spark', { tint: { start: 0xffffff, end: 0xff0000 } }); // over lifetime

const emitter = this.add.particles(400, 300, 'spark', {
    speed: 100, lifespan: 4000, scale: { start: 0.4, end: 0 }, quantity: 2
});

const well = emitter.createGravityWell({
    x: 400, y: 300, power: 2, epsilon: 100, gravity: 50
});

// Update at runtime
well.x = 300;
well.power = -1;  // negative = repel

// Or create manually and add
const well2 = new Phaser.GameObjects.Particles.GravityWell(500, 200, 3, 100, 50);
emitter.addParticleProcessor(well2);
emitter.removeParticleProcessor(well2);

// Using built-in geometry
this.add.particles(400, 300, 'spark', {
    speed: 50, lifespan: 2000,
    emitZone: { type: 'random', source: new Phaser.Geom.Circle(0, 0, 100) }
});

// Custom source object (any object with getRandomPoint)
emitter.addEmitZone({
    type: 'random',
    source: {
        getRandomPoint: (point) => {
            const a = Math.random() * Math.PI * 2;
            point.x = Math.cos(a) * 100;
            point.y = Math.sin(a) * 50;
            return point;
        }
    }
});

this.add.particles(400, 300, 'spark', {
    lifespan: 1500, speed: 20,
    emitZone: {
        type: 'edge',
        source: new Phaser.Geom.Circle(0, 0, 150),
        quantity: 48,     // number of points on edge (use 0 with stepRate instead)
        yoyo: false,      // reverse direction at ends
        seamless: true    // remove duplicate endpoint
    }
});

// Or add post-creation with any source that has getPoints
emitter.addEmitZone({ type: 'edge', source: geom, quantity: 50, yoyo: false, seamless: true });

this.add.particles(400, 300, 'spark', {
    emitZone: [
        { type: 'random', source: new Phaser.Geom.Circle(0, 0, 50) },
        { type: 'random', source: new Phaser.Geom.Circle(200, 0, 50) }
    ]
});

// Kill particles entering a rectangle
this.add.particles(400, 100, 'spark', {
    speed: 200, lifespan: 5000, gravityY: 100,
    deathZone: { type: 'onEnter', source: new Phaser.Geom.Rectangle(300, 400, 200, 50) }
});

// Kill particles leaving a circle (confine to area)
this.add.particles(400, 300, 'spark', {
    speed: 100, lifespan: 5000,
    deathZone: { type: 'onLeave', source: new Phaser.Geom.Circle(400, 300, 150) }
});

// Custom death zone source (any object with contains)
emitter.addDeathZone({
    type: 'onEnter',
    source: { contains: (x, y) => x > 600 && y > 400 }
});

const player = this.add.sprite(100, 100, 'player');
const emitter = this.add.particles(0, 0, 'spark', {
    speed: 50, lifespan: 800, scale: { start: 0.5, end: 0 }
});

emitter.startFollow(player);                       // follow position
emitter.startFollow(player, 10, -20);              // with offset
emitter.startFollow(player, 0, 0, true);           // track visibility too
emitter.stopFollow();

// Or via config:
this.add.particles(0, 0, 'spark', { follow: player, followOffset: { x: 0, y: -20 } });

// Via config
const emitter = this.add.particles(400, 300, 'spark', {
    speed: 100, lifespan: 2000,
    emitCallback: (particle, emitter) => { /* on emit */ },
    deathCallback: (particle) => { /* on death */ }
});

// Or set after creation
emitter.onParticleEmit((particle, emitter) => { /* ... */ });
emitter.onParticleDeath((particle) => { /* ... */ });

// Iterate alive/dead particles
emitter.forEachAlive((particle, emitter) => { /* particle.x, particle.lifeT */ });

// Auto-stop after 3 seconds (alive particles continue until they expire)
this.add.particles(400, 300, 'spark', { speed: 100, duration: 3000 });

// Emit exactly 50 particles then stop
this.add.particles(400, 300, 'spark', { speed: 100, stopAfter: 50 });

// Pre-warm: fast-forward 2 seconds so particles visible on first frame
this.add.particles(400, 300, 'spark', { speed: 100, lifespan: 2000, advance: 2000 });
// Or manually: emitter.fastForward(2000, 50);

this.add.particles(400, 300, 'spark', {
    speed: 200, lifespan: 5000, bounce: 0.8,
    bounds: { x: 100, y: 100, width: 600, height: 400 },
    collideLeft: true, collideRight: true, collideTop: true, collideBottom: true
});
// Or: emitter.addParticleBounds(100, 100, 600, 400);

// Random frame per particle
this.add.particles(400, 300, 'flares', { frame: ['red', 'green', 'blue'] });

// Sequential frames cycling through with quantity per frame
this.add.particles(400, 300, 'flares', {
    frame: { frames: ['red', 'green', 'blue'], cycle: true, quantity: 4 }
});

// Particle animation (plays anim over particle lifetime)
this.add.particles(400, 300, 'explosion', { anim: 'explode_anim', lifespan: 1000 });

// Multiple anims, randomly assigned
this.add.particles(400, 300, 'sheet', {
    anim: { anims: ['fire', 'smoke'], cycle: false, quantity: 1 }
});

this.add.particles(400, 300, 'spark', { sortProperty: 'y', sortOrderAsc: true });
// Or: sortCallback: (a, b) => a.y - b.y

class WindProcessor extends Phaser.GameObjects.Particles.ParticleProcessor {
    constructor (windX, windY) {
        super(0, 0);
        this.windX = windX;
        this.windY = windY;
    }

    update (particle, delta, step, t) {
        particle.velocityX += this.windX * step;
        particle.velocityY += this.windY * step;
    }
}

emitter.addParticleProcessor(new WindProcessor(0.5, 0));

class TrailParticle extends Phaser.GameObjects.Particles.Particle {
    update (delta, step, processors) {
        const result = super.update(delta, step, processors);
        this.alpha = this.lifeT;  // custom: alpha matches life progress
        return result;  // must return true if particle is still alive
    }
}

this.add.particles(400, 300, 'spark', {
    particleClass: TrailParticle,
    speed: 100, lifespan: 2000
});