| import { Line } from './Line.js'; |
| import { Vector3 } from '../math/Vector3.js'; |
| import { Float32BufferAttribute } from '../core/BufferAttribute.js'; |
|
|
| const _start = new Vector3(); |
| const _end = new Vector3(); |
|
|
| class LineSegments extends Line { |
|
|
| constructor( geometry, material ) { |
|
|
| super( geometry, material ); |
|
|
| this.isLineSegments = true; |
|
|
| this.type = 'LineSegments'; |
|
|
| } |
|
|
| computeLineDistances() { |
|
|
| const geometry = this.geometry; |
|
|
| |
|
|
| if ( geometry.index === null ) { |
|
|
| const positionAttribute = geometry.attributes.position; |
| const lineDistances = []; |
|
|
| for ( let i = 0, l = positionAttribute.count; i < l; i += 2 ) { |
|
|
| _start.fromBufferAttribute( positionAttribute, i ); |
| _end.fromBufferAttribute( positionAttribute, i + 1 ); |
|
|
| lineDistances[ i ] = ( i === 0 ) ? 0 : lineDistances[ i - 1 ]; |
| lineDistances[ i + 1 ] = lineDistances[ i ] + _start.distanceTo( _end ); |
|
|
| } |
|
|
| geometry.setAttribute( 'lineDistance', new Float32BufferAttribute( lineDistances, 1 ) ); |
|
|
| } else { |
|
|
| console.warn( 'THREE.LineSegments.computeLineDistances(): Computation only possible with non-indexed BufferGeometry.' ); |
|
|
| } |
|
|
| return this; |
|
|
| } |
|
|
| } |
|
|
| export { LineSegments }; |
|
|
