58 lines
1.7 KiB
Plaintext
58 lines
1.7 KiB
Plaintext
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//----------------------------------------------
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// Koreographer
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// Copyright © 2014-2019 Sonic Bloom, LLC
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//----------------------------------------------
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using UnityEngine;
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namespace SonicBloom.Koreo.Demos
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{
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[RequireComponent(typeof(ParticleSystem))]
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[AddComponentMenu("Koreographer/Demos/Emit Particles On Span")]
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public class EmitParticlesOnSpan : MonoBehaviour
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{
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[EventID]
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public string eventID;
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public float particlesPerBeat = 100;
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ParticleSystem particleCom;
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int lastEmitFrame = -1;
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void Start()
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{
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particleCom = GetComponent<ParticleSystem>();
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// Register for Koreography Events. This sets up the callback.
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Koreographer.Instance.RegisterForEvents(eventID, OnParticleControlEvent);
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}
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void OnDestroy()
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{
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// Sometimes the Koreographer Instance gets cleaned up before hand.
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// No need to worry in that case.
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if (Koreographer.Instance != null)
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{
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Koreographer.Instance.UnregisterForAllEvents(this);
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}
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}
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void OnParticleControlEvent(KoreographyEvent evt)
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{
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// If two Koreography span events overlap, this can be called twice in the same frame.
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// This check ensures that we only ask the particle system to emit once for any frame.
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if (Time.frameCount != lastEmitFrame)
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{
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// Spans get called over a specified amount of music time. Use Koreographer's beat delta
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// to calculate the number of particles to emit this frame based on the "particlesPerBeat"
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// rate configured in the Inspector.
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int particleCount = (int)(particlesPerBeat * Koreographer.GetBeatTimeDelta());
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// Emit the calculated number of particles!
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particleCom.Emit(particleCount);
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lastEmitFrame = Time.frameCount;
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}
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}
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}
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}
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