56 lines
1.2 KiB
JavaScript
56 lines
1.2 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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const _start = /*@__PURE__*/ new Vector3();
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const _end = /*@__PURE__*/ new Vector3();
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class LineSegments extends Line {
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constructor( geometry, material ) {
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super( geometry, material );
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this.isLineSegments = true;
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this.type = 'LineSegments';
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}
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computeLineDistances() {
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const geometry = this.geometry;
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// we assume non-indexed geometry
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if ( geometry.index === null ) {
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const positionAttribute = geometry.attributes.position;
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const lineDistances = [];
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for ( let 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.setAttribute( '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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return this;
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}
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}
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export { LineSegments };
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