| import { BufferGeometry } from '../core/BufferGeometry.js'; |
| import { Float32BufferAttribute } from '../core/BufferAttribute.js'; |
| import { Vector3 } from '../math/Vector3.js'; |
| import { Vector2 } from '../math/Vector2.js'; |
|
|
| class CircleGeometry extends BufferGeometry { |
|
|
| constructor( radius = 1, segments = 32, thetaStart = 0, thetaLength = Math.PI * 2 ) { |
|
|
| super(); |
|
|
| this.type = 'CircleGeometry'; |
|
|
| this.parameters = { |
| radius: radius, |
| segments: segments, |
| thetaStart: thetaStart, |
| thetaLength: thetaLength |
| }; |
|
|
| segments = Math.max( 3, segments ); |
|
|
| |
|
|
| const indices = []; |
| const vertices = []; |
| const normals = []; |
| const uvs = []; |
|
|
| |
|
|
| const vertex = new Vector3(); |
| const uv = new Vector2(); |
|
|
| |
|
|
| vertices.push( 0, 0, 0 ); |
| normals.push( 0, 0, 1 ); |
| uvs.push( 0.5, 0.5 ); |
|
|
| for ( let s = 0, i = 3; s <= segments; s ++, i += 3 ) { |
|
|
| const segment = thetaStart + s / segments * thetaLength; |
|
|
| |
|
|
| vertex.x = radius * Math.cos( segment ); |
| vertex.y = radius * Math.sin( segment ); |
|
|
| vertices.push( vertex.x, vertex.y, vertex.z ); |
|
|
| |
|
|
| normals.push( 0, 0, 1 ); |
|
|
| |
|
|
| uv.x = ( vertices[ i ] / radius + 1 ) / 2; |
| uv.y = ( vertices[ i + 1 ] / radius + 1 ) / 2; |
|
|
| uvs.push( uv.x, uv.y ); |
|
|
| } |
|
|
| |
|
|
| for ( let i = 1; i <= segments; i ++ ) { |
|
|
| indices.push( i, i + 1, 0 ); |
|
|
| } |
|
|
| |
|
|
| this.setIndex( indices ); |
| this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) ); |
| this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) ); |
| this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) ); |
|
|
| } |
|
|
| copy( source ) { |
|
|
| super.copy( source ); |
|
|
| this.parameters = Object.assign( {}, source.parameters ); |
|
|
| return this; |
|
|
| } |
|
|
| static fromJSON( data ) { |
|
|
| return new CircleGeometry( data.radius, data.segments, data.thetaStart, data.thetaLength ); |
|
|
| } |
|
|
| } |
|
|
|
|
| export { CircleGeometry }; |
|
|
