Function update

packages/particle-editor/src/panels/ParticleEditorPanel.tsx:499–938

(time: number)

         * Update loop
         */
        const update = (time: number) => {
            const deltaTime = lastTimeRef.current ? (time - lastTimeRef.current) / 1000 : 0.016;
            lastTimeRef.current = time;

            const dt = isPlaying ? deltaTime * data.playbackSpeed : 0;
            noiseTimeRef.current += dt * noiseScrollSpeed;

            // 手动触发爆发（点击触发）| Manual burst trigger (click to emit)
            if (triggerBurst !== lastTriggerBurstRef.current) {
                lastTriggerBurstRef.current = triggerBurst;
                // 触发所有 burst 配置 | Trigger all burst configs
                if (bursts.length > 0) {
                    for (const burst of bursts) {
                        for (let j = 0; j < burst.count && particlesRef.current.length < data.maxParticles; j++) {
                            emitParticle();
                        }
                    }
                } else {
                    // 如果没有 burst 配置，发射一些默认粒子 | If no burst config, emit some default particles
                    const defaultCount = Math.min(data.maxParticles, 50);
                    for (let j = 0; j < defaultCount && particlesRef.current.length < data.maxParticles; j++) {
                        emitParticle();
                    }
                }
            }

            if (isPlaying) {
                elapsedTimeRef.current += dt;

                // 持续发射 | Continuous emission
                emissionAccumulatorRef.current += data.emissionRate * dt;
                while (emissionAccumulatorRef.current >= 1 && particlesRef.current.length < data.maxParticles) {
                    emitParticle();
                    emissionAccumulatorRef.current -= 1;
                }

                // 爆发发射 | Burst emission
                for (let i = 0; i < bursts.length; i++) {
                    const burst = bursts[i];
                    if (!burstFiredRef.current.has(i) && elapsedTimeRef.current >= burst.time) {
                        for (let j = 0; j < burst.count && particlesRef.current.length < data.maxParticles; j++) {
                            emitParticle();
                        }
                        burstFiredRef.current.add(i);
                    }
                }

                // 更新粒子 | Update particles
                particlesRef.current = particlesRef.current.filter(p => {
                    p.age += dt;
                    if (p.age >= p.lifetime) return false;

                    const normalizedAge = p.age / p.lifetime;

                    // VelocityOverLifetime 模块 | Velocity module
                    if (velocityEnabled) {
                        // 阻力 | Drag
                        if (linearDrag > 0) {