three
Version:
JavaScript 3D library
119 lines (86 loc) • 2.12 kB
JavaScript
import { Curve } from '../core/Curve.js';
import { QuadraticBezier } from '../core/Interpolations.js';
import { Vector3 } from '../../math/Vector3.js';
/**
* A curve representing a 3D Quadratic Bezier curve.
*
* @augments Curve
*/
class QuadraticBezierCurve3 extends Curve {
/**
* Constructs a new Quadratic Bezier curve.
*
* @param {Vector3} [v0] - The start point.
* @param {Vector3} [v1] - The control point.
* @param {Vector3} [v2] - The end point.
*/
constructor( v0 = new Vector3(), v1 = new Vector3(), v2 = new Vector3() ) {
super();
/**
* This flag can be used for type testing.
*
* @type {boolean}
* @readonly
* @default true
*/
this.isQuadraticBezierCurve3 = true;
this.type = 'QuadraticBezierCurve3';
/**
* The start point.
*
* @type {Vector3}
*/
this.v0 = v0;
/**
* The control point.
*
* @type {Vector3}
*/
this.v1 = v1;
/**
* The end point.
*
* @type {Vector3}
*/
this.v2 = v2;
}
/**
* Returns a point on the curve.
*
* @param {number} t - A interpolation factor representing a position on the curve. Must be in the range `[0,1]`.
* @param {Vector3} [optionalTarget] - The optional target vector the result is written to.
* @return {Vector3} The position on the curve.
*/
getPoint( t, optionalTarget = new Vector3() ) {
const point = optionalTarget;
const v0 = this.v0, v1 = this.v1, v2 = this.v2;
point.set(
QuadraticBezier( t, v0.x, v1.x, v2.x ),
QuadraticBezier( t, v0.y, v1.y, v2.y ),
QuadraticBezier( t, v0.z, v1.z, v2.z )
);
return point;
}
copy( source ) {
super.copy( source );
this.v0.copy( source.v0 );
this.v1.copy( source.v1 );
this.v2.copy( source.v2 );
return this;
}
toJSON() {
const data = super.toJSON();
data.v0 = this.v0.toArray();
data.v1 = this.v1.toArray();
data.v2 = this.v2.toArray();
return data;
}
fromJSON( json ) {
super.fromJSON( json );
this.v0.fromArray( json.v0 );
this.v1.fromArray( json.v1 );
this.v2.fromArray( json.v2 );
return this;
}
}
export { QuadraticBezierCurve3 };