Method emit

packages/particle/src/ParticleEmitter.ts:167–204

* 发射粒子 * Emit particles * * @param pool - Particle pool * @param dt - Delta time in seconds * @param worldX - World position X * @param worldY - World position Y * @param worldRotation - World rotation in radians (applied to emission direction) * @param worldS

(
        pool: ParticlePool,
        dt: number,
        worldX: number,
        worldY: number,
        worldRotation: number = 0,
        worldScaleX: number = 1,
        worldScaleY: number = 1
    )

     * @returns Number of particles emitted
     */
    emit(
        pool: ParticlePool,
        dt: number,
        worldX: number,
        worldY: number,
        worldRotation: number = 0,
        worldScaleX: number = 1,
        worldScaleY: number = 1
    ): number {
        if (!this._isEmitting) return 0;

        let emitted = 0;

        if (this.config.burstCount > 0) {
            // 爆发模式 | Burst mode
            for (let i = 0; i < this.config.burstCount; i++) {
                const p = pool.spawn();
                if (p) {
                    this._initParticle(p, worldX, worldY, worldRotation, worldScaleX, worldScaleY);
                    emitted++;
                }
            }
            this._isEmitting = false;
        } else {
            // 持续发射 | Continuous emission
            this._emissionAccumulator += this.config.emissionRate * dt;
            while (this._emissionAccumulator >= 1) {
                const p = pool.spawn();
                if (p) {
                    this._initParticle(p, worldX, worldY, worldRotation, worldScaleX, worldScaleY);
                    emitted++;
                }
                this._emissionAccumulator -= 1;
            }
        }

        return emitted;
    }

    /**
     * 立即爆发发射