text: import {
  	AnimationClip,
  	BooleanKeyframeTrack,
  	ColorKeyframeTrack,
  	NumberKeyframeTrack,
  	Vector3,
  	VectorKeyframeTrack
  } from '../.././build/three.module.js';
  
  class AnimationClipCreator {
  
  	static CreateRotationAnimation( period, axis = 'x' ) {
  
  		const times = [ 0, period ], values = [ 0, 360 ];
  
  		const trackName = '.rotation[' + axis + ']';
  
  		const track = new NumberKeyframeTrack( trackName, times, values );
  
  		return new AnimationClip( null, period, [ track ] );
  
  	}
  
  	static CreateScaleAxisAnimation( period, axis = 'x' ) {
  
  		const times = [ 0, period ], values = [ 0, 1 ];
  
  		const trackName = '.scale[' + axis + ']';
  
  		const track = new NumberKeyframeTrack( trackName, times, values );
  
  		return new AnimationClip( null, period, [ track ] );
  
  	}
  
  	static CreateShakeAnimation( duration, shakeScale ) {
  
  		const times = [], values = [], tmp = new Vector3();
  
  		for ( let i = 0; i < duration * 10; i ++ ) {
  
  			times.push( i / 10 );
  
  			tmp.set( Math.random() * 2.0 - 1.0, Math.random() * 2.0 - 1.0, Math.random() * 2.0 - 1.0 ).
  				multiply( shakeScale ).
  				toArray( values, values.length );
  
  		}
  
  		const trackName = '.position';
  
  		const track = new VectorKeyframeTrack( trackName, times, values );
  
  		return new AnimationClip( null, duration, [ track ] );
  
  	}
  
  	static CreatePulsationAnimation( duration, pulseScale ) {
  
  		const times = [], values = [], tmp = new Vector3();
  
  		for ( let i = 0; i < duration * 10; i ++ ) {
  
  			times.push( i / 10 );
  
  			const scaleFactor = Math.random() * pulseScale;
  			tmp.set( scaleFactor, scaleFactor, scaleFactor ).
  				toArray( values, values.length );
  
  		}
  
  		const trackName = '.scale';
  
  		const track = new VectorKeyframeTrack( trackName, times, values );
  
  		return new AnimationClip( null, duration, [ track ] );
  
  	}
  
  	static CreateVisibilityAnimation( duration ) {
  
  		const times = [ 0, duration / 2, duration ], values = [ true, false, true ];
  
  		const trackName = '.visible';
  
  		const track = new BooleanKeyframeTrack( trackName, times, values );
  
  		return new AnimationClip( null, duration, [ track ] );
  
  	}
  
  	static CreateMaterialColorAnimation( duration, colors ) {
  
  		const times = [], values = [],
  			timeStep = duration / colors.length;
  
  		for ( let i = 0; i <= colors.length; i ++ ) {
  
  			times.push( i * timeStep );
  			values.push( colors[ i % colors.length ] );
  
  		}
  
  		const trackName = '.material[0].color';
  
  		const track = new ColorKeyframeTrack( trackName, times, values );
  
  		return new AnimationClip( null, duration, [ track ] );
  
  	}
  
  }
  
  export { AnimationClipCreator };
  