Method rotate

src/math/p5.Vector.js:2166–2173

* Rotates a 2D vector by an angle without changing its magnitude. * * By convention, the positive x-axis has an angle of 0. Angles increase in * the clockwise direction. * * If the vector was created with * createVector() , `rotate()` uses * the un

(a)

   * }
   */
  rotate(a) {
    let newHeading = this.heading() + a;
    if (this.isPInst) newHeading = this._toRadians(newHeading);
    const mag = this.mag();
    this.x = Math.cos(newHeading) * mag;
    this.y = Math.sin(newHeading) * mag;
    return this;
  }

  /**
   * Calculates the angle between two vectors.