three
Version:
JavaScript 3D library
74 lines (49 loc) • 1.63 kB
JavaScript
import { Line } from './Line.js';
import { Vector3 } from '../math/Vector3.js';
import { Float32BufferAttribute } from '../core/BufferAttribute.js';
const _start = /*@__PURE__*/ new Vector3();
const _end = /*@__PURE__*/ new Vector3();
/**
* A series of lines drawn between pairs of vertices.
*
* @augments Line
*/
class LineSegments extends Line {
/**
* Constructs a new line segments.
*
* @param {BufferGeometry} [geometry] - The line geometry.
* @param {Material|Array<Material>} [material] - The line material.
*/
constructor( geometry, material ) {
super( geometry, material );
/**
* This flag can be used for type testing.
*
* @type {boolean}
* @readonly
* @default true
*/
this.isLineSegments = true;
this.type = 'LineSegments';
}
computeLineDistances() {
const geometry = this.geometry;
// we assume non-indexed 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 };