three
Version:
JavaScript 3D library
78 lines (43 loc) • 1.78 kB
JavaScript
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();
function LineSegments( geometry, material ) {
Line.call( this, geometry, material );
this.type = 'LineSegments';
}
LineSegments.prototype = Object.assign( Object.create( Line.prototype ), {
constructor: LineSegments,
isLineSegments: true,
computeLineDistances: function () {
const geometry = this.geometry;
if ( geometry.isBufferGeometry ) {
// 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.' );
}
} else if ( geometry.isGeometry ) {
const vertices = geometry.vertices;
const lineDistances = geometry.lineDistances;
for ( let i = 0, l = vertices.length; i < l; i += 2 ) {
_start.copy( vertices[ i ] );
_end.copy( vertices[ i + 1 ] );
lineDistances[ i ] = ( i === 0 ) ? 0 : lineDistances[ i - 1 ];
lineDistances[ i + 1 ] = lineDistances[ i ] + _start.distanceTo( _end );
}
}
return this;
}
} );
export { LineSegments };