guoyao-jiankang/public/static/threejs135/jsm/lines/LineGeometry.js

import { LineSegmentsGeometry } from '../lines/LineSegmentsGeometry.js';

class LineGeometry extends LineSegmentsGeometry {

	constructor() {

		super();
		this.type = 'LineGeometry';

	}

	setPositions( array ) {

		// converts [ x1, y1, z1,  x2, y2, z2, ... ] to pairs format

		var length = array.length - 3;
		var points = new Float32Array( 2 * length );

		for ( var 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 ];

		}

		super.setPositions( points );

		return this;

	}

	setColors( array ) {

		// converts [ r1, g1, b1,  r2, g2, b2, ... ] to pairs format

		var length = array.length - 3;
		var colors = new Float32Array( 2 * length );

		for ( var 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 ];

		}

		super.setColors( colors );

		return this;

	}

	fromLine( line ) {

		var geometry = line.geometry;

		if ( geometry.isGeometry ) {

			console.error( 'THREE.LineGeometry no longer supports Geometry. Use THREE.BufferGeometry instead.' );
			return;

		} else if ( geometry.isBufferGeometry ) {

			this.setPositions( geometry.attributes.position.array ); // assumes non-indexed

		}

		// set colors, maybe

		return this;

	}

}

LineGeometry.prototype.isLineGeometry = true;

export { LineGeometry };