three.js/src/animation/KeyframeTrack.js

import { KeyframeTrackPrototype } from './KeyframeTrackPrototype.js';
import { StringKeyframeTrack } from './tracks/StringKeyframeTrack.js';
import { BooleanKeyframeTrack } from './tracks/BooleanKeyframeTrack.js';
import { QuaternionKeyframeTrack } from './tracks/QuaternionKeyframeTrack.js';
import { ColorKeyframeTrack } from './tracks/ColorKeyframeTrack.js';
import { VectorKeyframeTrack } from './tracks/VectorKeyframeTrack.js';
import { NumberKeyframeTrack } from './tracks/NumberKeyframeTrack.js';
import { AnimationUtils } from './AnimationUtils.js';
import { KeyframeTrackConstructor } from './KeyframeTrackConstructor.js';

/**
 *
 * A timed sequence of keyframes for a specific property.
 *
 *
 * @author Ben Houston / http://clara.io/
 * @author David Sarno / http://lighthaus.us/
 * @author tschw
 */

function KeyframeTrack( name, times, values, interpolation ) {

	KeyframeTrackConstructor.apply( this, arguments );

}

KeyframeTrack.prototype = KeyframeTrackPrototype;
KeyframeTrackPrototype.constructor = KeyframeTrack;

// Static methods:

Object.assign( KeyframeTrack, {

	// Serialization (in static context, because of constructor invocation
	// and automatic invocation of .toJSON):

	parse: function( json ) {

		if( json.type === undefined ) {

			throw new Error( "track type undefined, can not parse" );

		}

		var trackType = KeyframeTrack._getTrackTypeForValueTypeName( json.type );

		if ( json.times === undefined ) {

			var times = [], values = [];

			AnimationUtils.flattenJSON( json.keys, times, values, 'value' );

			json.times = times;
			json.values = values;

		}

		// derived classes can define a static parse method
		if ( trackType.parse !== undefined ) {

			return trackType.parse( json );

		} else {

			// by default, we assume a constructor compatible with the base
			return new trackType(
					json.name, json.times, json.values, json.interpolation );

		}

	},

	toJSON: function( track ) {

		var trackType = track.constructor;

		var json;

		// derived classes can define a static toJSON method
		if ( trackType.toJSON !== undefined ) {

			json = trackType.toJSON( track );

		} else {

			// by default, we assume the data can be serialized as-is
			json = {

				'name': track.name,
				'times': AnimationUtils.convertArray( track.times, Array ),
				'values': AnimationUtils.convertArray( track.values, Array )

			};

			var interpolation = track.getInterpolation();

			if ( interpolation !== track.DefaultInterpolation ) {

				json.interpolation = interpolation;

			}

		}

		json.type = track.ValueTypeName; // mandatory

		return json;

	},

	_getTrackTypeForValueTypeName: function( typeName ) {

		switch( typeName.toLowerCase() ) {

			case "scalar":
			case "double":
			case "float":
			case "number":
			case "integer":

				return NumberKeyframeTrack;

			case "vector":
			case "vector2":
			case "vector3":
			case "vector4":

				return VectorKeyframeTrack;

			case "color":

				return ColorKeyframeTrack;

			case "quaternion":

				return QuaternionKeyframeTrack;

			case "bool":
			case "boolean":

				return BooleanKeyframeTrack;

			case "string":

				return StringKeyframeTrack;

		}

		throw new Error( "Unsupported typeName: " + typeName );

	}

} );


export { KeyframeTrack };