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src/three/lines/LineGeometry.js

import {THREE} from '../utils';

THREE.LineGeometry = function () {
	THREE.LineSegmentsGeometry.call( this );
	this.type = 'LineGeometry';
};

THREE.LineGeometry.prototype = Object.assign( Object.create( THREE.LineSegmentsGeometry.prototype ), {
	constructor: THREE.LineGeometry,
	isLineGeometry: true,

	setPositions: function ( array ) {
		let length = array.length - 3;
		let points = new Float32Array( 2 * length );

		for ( let i = 0; i < length; i += 3 ) {

			points[ 2 * i ] = array[ i ];
			points[ 2 * i + 1 ] = array[ i + 1 ];
			points[ 2 * i + 2 ] = array[ i + 2 ];

			points[ 2 * i + 3 ] = array[ i + 3 ];
			points[ 2 * i + 4 ] = array[ i + 4 ];
			points[ 2 * i + 5 ] = array[ i + 5 ];

		}

		THREE.LineSegmentsGeometry.prototype.setPositions.call( this, points );
		return this;
	},

	setColors: function ( array ) {
		let length = array.length - 3;
		let colors = new Float32Array( 2 * length );

		for ( let i = 0; i < length; i += 3 ) {
			colors[ 2 * i ] = array[ i ];
			colors[ 2 * i + 1 ] = array[ i + 1 ];
			colors[ 2 * i + 2 ] = array[ i + 2 ];

			colors[ 2 * i + 3 ] = array[ i + 3 ];
			colors[ 2 * i + 4 ] = array[ i + 4 ];
			colors[ 2 * i + 5 ] = array[ i + 5 ];

		}

		THREE.LineSegmentsGeometry.prototype.setColors.call( this, colors );
		return this;

	}
	//,

	// fromLine: function ( line ) {
	//
	// 	let geometry = line.geometry;
	//
	// 	if ( geometry.isGeometry ) {
	//
	// 		this.setPositions( geometry.vertices );
	//
	// 	} else if ( geometry.isBufferGeometry ) {
	//
	// 		this.setPositions( geometry.position.array ); // assumes non-indexed
	//
	// 	}
	// 	return this;
	// }
} );