86 lines
1.8 KiB
JavaScript
86 lines
1.8 KiB
JavaScript
import { Line } from './Line.js';
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import { Vector3 } from '../math/Vector3.js';
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import { Float32BufferAttribute } from '../core/BufferAttribute.js';
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/**
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* @author mrdoob / http://mrdoob.com/
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*/
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function LineSegments( geometry, material ) {
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Line.call( this, geometry, material );
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this.type = 'LineSegments';
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}
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LineSegments.prototype = Object.assign( Object.create( Line.prototype ), {
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constructor: LineSegments,
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isLineSegments: true,
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computeLineDistances: ( function () {
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var start = new Vector3();
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var end = new Vector3();
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return function computeLineDistances() {
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var geometry = this.geometry;
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if ( geometry.isBufferGeometry ) {
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// we assume non-indexed geometry
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if ( geometry.index === null ) {
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var positionAttribute = geometry.attributes.position;
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var lineDistances = [];
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for ( var i = 0, l = positionAttribute.count; i < l; i += 2 ) {
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start.fromBufferAttribute( positionAttribute, i );
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end.fromBufferAttribute( positionAttribute, i + 1 );
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lineDistances[ i ] = ( i === 0 ) ? 0 : lineDistances[ i - 1 ];
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lineDistances[ i + 1 ] = lineDistances[ i ] + start.distanceTo( end );
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}
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geometry.addAttribute( 'lineDistance', new Float32BufferAttribute( lineDistances, 1 ) );
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} else {
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console.warn( 'THREE.LineSegments.computeLineDistances(): Computation only possible with non-indexed BufferGeometry.' );
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}
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} else if ( geometry.isGeometry ) {
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var vertices = geometry.vertices;
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var lineDistances = geometry.lineDistances;
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for ( var i = 0, l = vertices.length; i < l; i += 2 ) {
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start.copy( vertices[ i ] );
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end.copy( vertices[ i + 1 ] );
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lineDistances[ i ] = ( i === 0 ) ? 0 : lineDistances[ i - 1 ];
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lineDistances[ i + 1 ] = lineDistances[ i ] + start.distanceTo( end );
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}
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}
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return this;
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};
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}() )
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} );
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export { LineSegments };
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